Contract Source Code:
File 1 of 1 : CryptoSVG
/**
*Submitted for verification at Etherscan.io on 2021-08-27
*/
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = '0123456789abcdef';
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return '0';
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return '0x00';
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = '0';
buffer[1] = 'x';
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, 'Strings: hex length insufficient');
return string(buffer);
}
}
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), 'Ownable: caller is not the owner');
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), 'Ownable: new owner is the zero address');
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, 'Address: insufficient balance');
(bool success, ) = recipient.call{value: amount}('');
require(success, 'Address: unable to send value, recipient may have reverted');
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, 'Address: low-level call failed');
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, 'Address: low-level call with value failed');
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, 'Address: insufficient balance for call');
require(isContract(target), 'Address: call to non-contract');
(bool success, bytes memory returndata) = target.call{value: value}(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, 'Address: low-level static call failed');
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), 'Address: static call to non-contract');
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, 'Address: low-level delegate call failed');
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), 'Address: delegate call to non-contract');
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) private pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
/**
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
* the Metadata extension, but not including the Enumerable extension, which is available separately as
* {ERC721Enumerable}.
*/
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;
// Mapping owner address to token count
mapping(address => uint256) private _balances;
// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), 'ERC721: balance query for the zero address');
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), 'ERC721: owner query for nonexistent token');
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), 'ERC721Metadata: URI query for nonexistent token');
string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : '';
}
/**
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty
* by default, can be overriden in child contracts.
*/
function _baseURI() internal view virtual returns (string memory) {
return '';
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721.ownerOf(tokenId);
require(to != owner, 'ERC721: approval to current owner');
require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
'ERC721: approve caller is not owner nor approved for all'
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), 'ERC721: approved query for nonexistent token');
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
require(operator != _msgSender(), 'ERC721: approve to caller');
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), 'ERC721: transfer caller is not owner nor approved');
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, '');
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), 'ERC721: transfer caller is not owner nor approved');
_safeTransfer(from, to, tokenId, _data);
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), 'ERC721: transfer to non ERC721Receiver implementer');
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), 'ERC721: operator query for nonexistent token');
address owner = ERC721.ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, '');
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeMint(
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
'ERC721: transfer to non ERC721Receiver implementer'
);
}
/**
* @dev Mints `tokenId` and transfers it to `to`.
*
* WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
*
* Requirements:
*
* - `tokenId` must not exist.
* - `to` cannot be the zero address.
*
* Emits a {Transfer} event.
*/
function _mint(address to, uint256 tokenId) internal virtual {
require(to != address(0), 'ERC721: mint to the zero address');
require(!_exists(tokenId), 'ERC721: token already minted');
_beforeTokenTransfer(address(0), to, tokenId);
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_balances[owner] -= 1;
delete _owners[tokenId];
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/
function _transfer(
address from,
address to,
uint256 tokenId
) internal virtual {
require(ERC721.ownerOf(tokenId) == from, 'ERC721: transfer of token that is not own');
require(to != address(0), 'ERC721: transfer to the zero address');
_beforeTokenTransfer(from, to, tokenId);
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits a {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver(to).onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert('ERC721: transfer to non ERC721Receiver implementer');
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Enumerable is IERC721 {
/**
* @dev Returns the total amount of tokens stored by the contract.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns a token ID owned by `owner` at a given `index` of its token list.
* Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
/**
* @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
* Use along with {totalSupply} to enumerate all tokens.
*/
function tokenByIndex(uint256 index) external view returns (uint256);
}
/**
* @dev This implements an optional extension of {ERC721} defined in the EIP that adds
* enumerability of all the token ids in the contract as well as all token ids owned by each
* account.
*/
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] private _allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
require(index < ERC721.balanceOf(owner), 'ERC721Enumerable: owner index out of bounds');
return _ownedTokens[owner][index];
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _allTokens.length;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
require(index < ERC721Enumerable.totalSupply(), 'ERC721Enumerable: global index out of bounds');
return _allTokens[index];
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual override {
super._beforeTokenTransfer(from, to, tokenId);
if (from == address(0)) {
_addTokenToAllTokensEnumeration(tokenId);
} else if (from != to) {
_removeTokenFromOwnerEnumeration(from, tokenId);
}
if (to == address(0)) {
_removeTokenFromAllTokensEnumeration(tokenId);
} else if (to != from) {
_addTokenToOwnerEnumeration(to, tokenId);
}
}
/**
* @dev Private function to add a token to this extension's ownership-tracking data structures.
* @param to address representing the new owner of the given token ID
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
uint256 length = ERC721.balanceOf(to);
_ownedTokens[to][length] = tokenId;
_ownedTokensIndex[tokenId] = length;
}
/**
* @dev Private function to add a token to this extension's token tracking data structures.
* @param tokenId uint256 ID of the token to be added to the tokens list
*/
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}
/**
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
* while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
* gas optimizations e.g. when performing a transfer operation (avoiding double writes).
* This has O(1) time complexity, but alters the order of the _ownedTokens array.
* @param from address representing the previous owner of the given token ID
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
uint256 tokenIndex = _ownedTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}
// This also deletes the contents at the last position of the array
delete _ownedTokensIndex[tokenId];
delete _ownedTokens[from][lastTokenIndex];
}
/**
* @dev Private function to remove a token from this extension's token tracking data structures.
* This has O(1) time complexity, but alters the order of the _allTokens array.
* @param tokenId uint256 ID of the token to be removed from the tokens list
*/
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _allTokens.length - 1;
uint256 tokenIndex = _allTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
// This also deletes the contents at the last position of the array
delete _allTokensIndex[tokenId];
_allTokens.pop();
}
}
contract CryptoSVG is ERC721Enumerable, Ownable {
uint256 public maxSupply = 5555;
uint256 public constant price = 0.009 ether;
uint256 public constant maxMintAmount = 20;
bool public active = false;
mapping(uint16 => uint16) private tokenMatrix;
enum FilterType {
blur,
texture,
linearGradient,
radialGradient,
fractalNoise,
turbulence,
pixel,
unregular
}
struct FType {
FilterType filterType;
string baseFrequency;
string numOctaves;
string surfaceScale;
}
function generateFilterBlur(
string memory id,
string memory x,
string memory y,
string memory size,
string memory deviation
) internal pure returns (string memory) {
string memory output = string(abi.encodePacked('<filter id="', id, '" x="', x, '" y="', y));
output = string(
abi.encodePacked(
string(abi.encodePacked('<filter id="', id, '" x="', x, '" y="', y)),
'" width="',
size,
'" height="',
size,
'"><feGaussianBlur stdDeviation="',
deviation,
'" /></filter>'
)
);
return output;
}
struct FilterBulence {
string x;
string y;
string size;
string filterType;
string baseFrequency;
string numOctaves;
}
function generateFilterBulence(string memory id, FilterBulence memory filterBulence)
internal
pure
returns (string memory)
{
string memory output = string(
abi.encodePacked('<filter id="', id, '" x="', filterBulence.x, '" y="', filterBulence.y)
);
output = string(
abi.encodePacked(
output,
'" width="',
filterBulence.size,
'" height="',
filterBulence.size,
'"><feTurbulence type="',
filterBulence.filterType
)
);
output = string(
abi.encodePacked(
output,
'" baseFrequency="',
filterBulence.baseFrequency,
'" numOctaves="',
filterBulence.numOctaves,
'" /><feComposite operator="in" in2="SourceGraphic" /></filter>'
)
);
return output;
}
function generateFilteUnregular(string memory id, string memory color) internal pure returns (string memory) {
return
string(
abi.encodePacked(
'<filter id="',
id,
'"><feMorphology operator="dilate" radius="2" result="r1" /><feFlood flood-color="',
color,
'" flood-opacity="1" /><feComposite operator="in" in2="r1" /><feComposite in2="SourceAlpha" result="c1" /><feTurbulence type="fractalNoise" baseFrequency="0.01 0" numOctaves="2" seed="0" /><feDisplacementMap in="c1" scale="17" xChannelSelector="A" yChannelSelector="A" /></filter>'
)
);
}
function generateFilterPixel(string memory id) internal pure returns (string memory) {
return
string(
abi.encodePacked(
'<filter id="',
id,
'"><feFlood height="5" width="5" /><feComposite width="18" height="18" /><feTile in="BackgroundImage" result="a" /><feComposite operator="in" in="SourceGraphic" in2="a" /><feMorphology operator="dilate" radius="5" /></filter>'
)
);
}
function generateFilterTexture(
string memory id,
string memory color,
string memory surfaceScale
) internal pure returns (string memory) {
return
string(
abi.encodePacked(
'<filter id="',
id,
'"><feTurbulence type="fractalNoise" baseFrequency="0.1" numOctaves="5" result="1" /><feDiffuseLighting in="1" lighting-color="',
color,
'" surfaceScale="',
surfaceScale,
'"><feDistantLight azimuth="45" elevation="60" /></feDiffuseLighting><feComposite operator="in" in2="SourceGraphic" /></filter>'
)
);
}
struct RadialGradient {
string cx;
string cy;
string r;
bool fxy;
string fx;
string fy;
bool reflect;
bool userSpaceOnUse;
}
function generateRadialGradient(string memory id, RadialGradient memory radialGradient)
internal
pure
returns (string memory)
{
string memory output = string(
abi.encodePacked(
'<radialGradient id="',
id,
radialGradient.userSpaceOnUse ? '" gradientUnits="userSpaceOnUse"' : '"',
' cx="',
radialGradient.cx,
'" cy="',
radialGradient.cy,
'" r="',
radialGradient.r
)
);
output = string(
abi.encodePacked(
output,
radialGradient.fxy ? '" fx="' : '"',
radialGradient.fxy ? radialGradient.fx : '',
radialGradient.fxy ? '" fy="' : '',
radialGradient.fxy ? radialGradient.fy : '',
radialGradient.fxy ? '" spreadMethod="' : ' spreadMethod="',
radialGradient.reflect ? 'reflect' : 'pad',
'">'
)
);
return output;
}
function generateLinearGradient(
string memory id,
string memory x,
string memory y,
string memory size
) internal pure returns (string memory) {
return
string(
abi.encodePacked(
string(
abi.encodePacked(
'<linearGradient id="',
id,
'" x="',
x,
'" y="',
y,
'" width="',
size,
'" height="'
)
),
size,
'">'
)
);
}
function generatesStop(
string memory opacity,
string memory offset,
string memory color
) internal pure returns (string memory) {
return
string(
abi.encodePacked(
'<stop style="stop-color:',
color,
';stop-opacity:',
opacity,
'" offset="',
offset,
'"/>'
)
);
}
struct Circle {
string cx;
string cy;
uint256 r;
string fill;
string filter;
string opacity;
}
function generateCircle(Circle memory circle) internal pure returns (string memory) {
return
generateEllipse(
Ellipase(circle.cx, circle.cy, circle.r, circle.r, circle.fill, circle.filter, circle.opacity)
);
}
struct Ellipase {
string cx;
string cy;
uint256 rx;
uint256 ry;
string fill;
string filter;
string opacity;
}
function generateEllipse(Ellipase memory ellipase) internal pure returns (string memory) {
return
string(
abi.encodePacked(
string(
abi.encodePacked(
'<ellipse cx="',
ellipase.cx,
'" cy="',
ellipase.cy,
'" rx="',
Strings.toString(ellipase.rx),
'" ry="'
)
),
Strings.toString(ellipase.ry),
'" fill="',
ellipase.fill,
'" filter="',
ellipase.filter,
'" opacity="',
ellipase.opacity,
'" />'
)
);
}
function moonLocation(
uint256 location,
uint256 startingLocation,
uint256 speed
) internal pure returns (int256) {
return 750 - (((int256(location / speed) % 901) + int256(startingLocation)) % 901);
}
function _url(string memory id) internal pure returns (string memory) {
return string(abi.encodePacked('url(#', id, ')'));
}
function calScale(int256 offset) internal pure returns (uint256) {
uint256 scale = 0;
if (offset >= 300 && offset <= 310) {
scale = 100 - uint256(offset - 300) * 10;
}
return scale;
}
function calOffset(int256 location) internal pure returns (string memory) {
string memory offsetString = '';
if (location >= 0) {
offsetString = Strings.toString(uint256(location));
} else {
offsetString = string(abi.encodePacked('-', Strings.toString(uint256(-location))));
}
return offsetString;
}
function animateMoon(int256 location, FilterType filterType) internal pure returns (string memory) {
return
string(
abi.encodePacked(
'<circle filter="',
filterType == FilterType.unregular ? _url('12') : filterType == FilterType.pixel ? _url('14') : '',
'" cx="',
calOffset(location),
'" cy="300" r="150" />'
)
);
}
function animateEllipse(int256 location, Ellipase memory ellipse) internal pure returns (string memory) {
uint256 scale = calScale(location);
return
generateEllipse(
Ellipase(
ellipse.cx,
ellipse.cy,
(ellipse.rx * scale) / 100,
(ellipse.ry * scale) / 100,
ellipse.fill,
ellipse.filter,
'1'
)
);
}
function animateCircle(int256 location, Circle memory circle) internal pure returns (string memory) {
return
generateCircle(
Circle(
circle.cx,
circle.cy,
(circle.r * calScale(location)) / 100,
circle.fill,
circle.filter,
circle.opacity
)
);
}
function generatePlant(
string memory color,
int256 location,
FType memory fType
) internal pure returns (string memory) {
string memory k150 = '150';
string memory k300 = '300';
string memory k1 = '1';
string memory k0 = '0';
string memory kEmpty = '';
uint256 scale = calScale(location);
FilterType filterType = fType.filterType;
string[54] memory parts;
parts[0] = '<svg xmlns="http://www.w3.org/2000/svg" width="600" height="600" viewBox="0 0 600 600"><defs>';
parts[1] = generateFilterBlur(k1, '-0.1', '-0.1', '2', k1);
parts[2] = generateFilterBlur('2', '-0.1', '-0.1', '2', '10');
parts[3] = generateFilterBlur('3', '-0.2', '-0.2', '3', '21');
parts[4] = generateFilterBlur('4', k0, k0, '2', '91');
parts[5] = generateFilterBlur('5', '-100', '-100', k300, '7');
parts[6] = generateFilterBlur('6', '-100', '-100', k300, '21');
parts[7] = generateFilterBlur('7', '-100', '-100', k300, '6');
parts[8] = generateFilterBulence(
'9',
FilterBulence(k0, k0, k1, 'fractalNoise', fType.baseFrequency, fType.numOctaves)
);
parts[9] = generateFilterBulence(
'10',
FilterBulence(k0, k0, k1, 'turbulence', fType.baseFrequency, fType.numOctaves)
);
parts[10] = generateFilteUnregular('11', color);
parts[11] = generateFilteUnregular('12', '#000000');
parts[12] = generateFilterPixel('14');
parts[13] = generateFilterTexture('15', color, fType.surfaceScale);
parts[14] = '</defs>';
parts[15] = generateRadialGradient(
'r1',
RadialGradient(k150, k300, Strings.toString((80 * scale) / 100), false, kEmpty, kEmpty, false, true)
);
parts[16] = generatesStop(k0, k0, color);
parts[17] = generatesStop(k0, '0.89', color);
parts[18] = generatesStop('0.99', '0.9', color);
parts[19] = generatesStop(k0, k1, color);
parts[20] = '</radialGradient>';
parts[21] = generateRadialGradient(
'r2',
RadialGradient('230', k300, Strings.toString((30 * scale) / 100), false, kEmpty, kEmpty, false, true)
);
parts[22] = generatesStop(k0, k0, color);
parts[23] = generatesStop(k0, '0.89', color);
parts[24] = generatesStop('0.99', '0.9', color);
parts[25] = generatesStop(k0, k1, color);
parts[26] = '</radialGradient>';
parts[27] = generateRadialGradient('r3', RadialGradient('0.3', '0.3', '0.4', true, '0.5', '0.5', true, false));
parts[28] = generatesStop(k1, k0, '#000000');
parts[29] = generatesStop(k1, k1, color);
parts[30] = '</radialGradient>';
parts[31] = generateLinearGradient('l1', k0, k0, k1);
parts[32] = generatesStop(k1, k0, color);
parts[33] = generatesStop(k1, k1, '#000000');
parts[34] = '</linearGradient>';
parts[35] = '<rect x="0" y="0" height="600" width="600" />';
parts[36] = string(
abi.encodePacked(
'<g transform="translate(300, 300)" filter="',
filterType == FilterType.unregular ? _url('11') : kEmpty,
'">'
)
);
parts[37] = filterType == FilterType.linearGradient
? generateCircle(Circle(k0, k0, 150, _url('l1'), _url(k1), k1))
: filterType == FilterType.radialGradient
? generateCircle(Circle(k0, k0, 150, _url('r3'), _url(k1), k1))
: filterType == FilterType.unregular || filterType == FilterType.pixel
? kEmpty
: generateCircle(Circle(k0, k0, 150, color, _url(k1), k1));
parts[38] = filterType == FilterType.linearGradient
? generateCircle(Circle(k0, k0, 150, _url('l1'), _url('2'), k1))
: filterType == FilterType.radialGradient
? generateCircle(Circle(k0, k0, 150, _url('r3'), _url('2'), k1))
: filterType == FilterType.unregular || filterType == FilterType.pixel
? kEmpty
: generateCircle(Circle(k0, k0, 150, color, _url('2'), k1));
parts[39] = filterType == FilterType.unregular
? generateCircle(Circle(k0, k0, 150, color, _url('11'), k1))
: filterType == FilterType.blur
? generateCircle(Circle(k0, k0, 150, color, _url('3'), k1))
: filterType == FilterType.turbulence
? generateCircle(Circle(k0, k0, 150, color, _url('10'), k1))
: filterType == FilterType.pixel
? generateCircle(Circle(k0, k0, 150, color, _url('14'), k1))
: filterType == FilterType.texture
? generateCircle(Circle(k0, k0, 150, color, _url('15'), k1))
: filterType == FilterType.linearGradient
? generateCircle(Circle(k0, k0, 150, _url('l1'), kEmpty, k1))
: filterType == FilterType.radialGradient
? generateCircle(Circle(k0, k0, 150, _url('r3'), kEmpty, k1))
: generateCircle(Circle(k0, k0, 150, color, _url('9'), k1));
parts[40] = '</g>';
parts[41] = animateMoon(location, filterType);
parts[42] = string(
abi.encodePacked(
'<g filter="',
filterType == FilterType.unregular ? _url('11') : filterType == FilterType.pixel ? _url('14') : kEmpty,
'">'
)
);
parts[43] = animateCircle(location, Circle(k150, k300, 100, _url('r1'), '', '0.25'));
parts[44] = animateCircle(location, Circle('225', k300, 50, _url('r2'), '', '0.25'));
parts[45] = animateCircle(location, Circle('110', k300, 30, color, '', '0.15'));
parts[46] = animateCircle(location, Circle('278', k300, 50, color, '', '0.1'));
parts[47] = '</g>';
parts[48] = string(abi.encodePacked('<g filter="', filterType == FilterType.pixel ? _url('14') : kEmpty, '">'));
parts[49] = animateEllipse(location, Ellipase(k150, k300, 15, 35, color, _url('5'), '1'));
parts[50] = animateEllipse(location, Ellipase(k150, k300, 25, 35, color, _url('6'), '1'));
parts[51] = animateEllipse(location, Ellipase(k150, k300, 10, 30, color, _url('7'), '1'));
parts[52] = '</g>';
parts[53] = '</svg>';
string memory output = kEmpty;
uint256 step = 8;
for (uint256 j; j < 6; j++) {
output = string(
abi.encodePacked(
output,
parts[j * step],
parts[j * step + 1],
parts[j * step + 2],
parts[j * step + 3],
parts[j * step + 4],
parts[j * step + 5],
parts[j * step + 6],
parts[j * step + 7]
)
);
}
output = string(abi.encodePacked(output, parts[48], parts[49], parts[50], parts[51], parts[52], parts[53]));
return output;
}
function parseFilterType(FilterType ft) internal pure returns (string memory) {
if (ft == FilterType.blur) {
return 'blur';
} else if (ft == FilterType.texture) {
return 'texture';
} else if (ft == FilterType.linearGradient) {
return 'linear';
} else if (ft == FilterType.radialGradient) {
return 'radial';
} else if (ft == FilterType.fractalNoise) {
return 'fractal';
} else if (ft == FilterType.turbulence) {
return 'turbulence';
} else if (ft == FilterType.pixel) {
return 'pixel';
} else if (ft == FilterType.unregular) {
return 'unregular';
}
return '';
}
function randomWithTokenId(string memory prefix, uint256 tokenId) internal pure returns (uint256) {
return CryptoSVGLibrary.random(string(abi.encodePacked(prefix, Strings.toString(tokenId))));
}
function getColor(uint256 tokenId) public pure returns (string memory) {
uint256 rand = randomWithTokenId('color', tokenId);
return string(abi.encodePacked('#', CryptoSVGLibrary.substring(Strings.toHexString(rand), 2, 8)));
}
function getType(uint256 tokenId) public pure returns (FType memory) {
uint256 rand = randomWithTokenId('type', tokenId);
uint256 rand1 = randomWithTokenId('baseFrequency', tokenId);
uint256 rand2 = randomWithTokenId('numOctaves', tokenId);
uint256 rand3 = randomWithTokenId('surfaceScale', tokenId);
uint256 num = (rand % 100) + 1;
uint256 num1 = (rand1 % 5) + 1;
uint256 num2 = (rand2 % 5) + 1;
uint256 num3 = (rand3 % 3) + 1;
FilterType ft = FilterType.blur;
if (num <= 25) {
ft = FilterType.blur;
} else if (num <= 45) {
ft = FilterType.texture;
} else if (num <= 60) {
ft = FilterType.linearGradient;
} else if (num <= 75) {
ft = FilterType.radialGradient;
} else if (num <= 85) {
ft = FilterType.turbulence;
} else if (num <= 95) {
ft = FilterType.fractalNoise;
} else if (num <= 98) {
ft = FilterType.unregular;
} else {
ft = FilterType.pixel;
}
return
FType(
ft,
string(abi.encodePacked('0.0', Strings.toString(num1))),
Strings.toString(num2),
Strings.toString(num3)
);
}
function getStartingLocation(uint256 tokenId) public pure returns (uint256) {
return randomWithTokenId('start', tokenId) % 901;
}
function getSpeed(uint256 tokenId) public pure returns (uint256, uint256) {
uint256 rand = randomWithTokenId('speed', tokenId);
uint256 speed = 1;
uint256 num = (randomWithTokenId('level', tokenId) % 100) + 1;
uint256 level = 6;
if (num <= 25) {
speed = (rand % (999 - 512)) + 513;
level = 6;
} else if (num <= 50) {
speed = (rand % (512 - 256)) + 257;
level = 5;
} else if (num <= 75) {
speed = (rand % (256 - 128)) + 129;
level = 4;
} else if (num <= 85) {
speed = (rand % (128 - 64)) + 65;
level = 3;
} else if (num <= 95) {
speed = (rand % (64 - 16)) + 17;
level = 2;
} else if (num <= 98) {
speed = (rand % 16) + 1;
level = 1;
} else {
speed = (rand % 9000) + 1000;
level = 0;
}
return (speed, level);
}
function getPeriod(uint256 tokenId) public pure returns (uint256) {
(uint256 speed, ) = getSpeed(tokenId);
return _getPeriod(speed);
}
function _getPeriod(uint256 speed) internal pure returns (uint256) {
return 900 * speed;
}
function packAttribute(
string memory color,
FType memory ft,
uint256 level,
uint256 period,
uint256 startingLocation
) internal pure returns (string memory) {
return
string(
abi.encodePacked(
'{"color": "',
string(
abi.encodePacked(
color,
'","type":"',
parseFilterType(ft.filterType),
'","speedLevel":"',
Strings.toString(level),
'","period":"',
string(abi.encodePacked(Strings.toString(period), ' block')),
'","startingLocation":"',
Strings.toString(startingLocation)
)
),
'"}'
)
);
}
function _tokenURI(
uint256 tokenId,
FType memory ft,
string memory color,
uint256 location,
uint256 startingLocation,
uint256 speed,
uint256 level
) internal pure returns (string memory) {
int256 _location = moonLocation(location, startingLocation, speed);
string memory json = Base64.encode(
bytes(
string(
abi.encodePacked(
'{"name": "SVG #',
Strings.toString(tokenId),
'", "description": "", "image": "data:image/svg+xml;base64,',
Base64.encode(bytes(generatePlant(color, _location, ft))),
'","attributes": ',
packAttribute(color, ft, level, _getPeriod(speed), startingLocation),
'}'
)
)
)
);
return string(abi.encodePacked('data:application/json;base64,', json));
}
function tokenURI(uint256 tokenId) public view override returns (string memory) {
(uint256 speed, uint256 level) = getSpeed(tokenId);
return
_tokenURI(
tokenId,
getType(tokenId),
getColor(tokenId),
block.number,
getStartingLocation(tokenId),
speed,
level
);
}
// Private and Internal functions
/**
* @dev Returns a random available token to be minted
*
* Code used as reference:
* https://github.com/1001-digital/erc721-extensions/blob/main/contracts/RandomlyAssigned.sol
*/
function _getTokenToBeMinted(uint16 _totalMintedTokens) private returns (uint16) {
uint16 maxIndex = uint16(maxSupply - totalSupply());
uint16 random = CryptoSVGLibrary.getRandomNumber(maxIndex, _totalMintedTokens);
uint16 tokenId = tokenMatrix[random];
if (tokenMatrix[random] == 0) {
tokenId = random;
}
tokenMatrix[maxIndex - 1] == 0 ? tokenMatrix[random] = maxIndex - 1 : tokenMatrix[random] = tokenMatrix[
maxIndex - 1
];
return tokenId;
}
function mint(uint256 amount) public payable {
require(active, 'No active');
require(amount <= maxMintAmount, 'Exceed limit');
require(msg.value >= price * amount, 'Insufficient ether provided');
uint256 supply = totalSupply();
require(supply + amount <= maxSupply, 'Exceed amount');
uint16 tmpTotalMintedTokens = uint16(supply);
for (uint256 i; i < amount; i++) {
_safeMint(_msgSender(), _getTokenToBeMinted(tmpTotalMintedTokens));
tmpTotalMintedTokens++;
}
}
function withdraw() public onlyOwner {
uint256 balance = address(this).balance;
require(balance > 0, 'No balance');
require(payable(msg.sender).send(balance));
}
function setActive(bool _active) public onlyOwner {
active = _active;
}
constructor() ERC721('CryptoSVG', 'CRYPTOSVG') Ownable() {}
}
library CryptoSVGLibrary {
function substring(
string memory str,
uint256 startIndex,
uint256 endIndex
) internal pure returns (string memory) {
bytes memory strBytes = bytes(str);
bytes memory result = new bytes(endIndex - startIndex);
for (uint256 i = startIndex; i < endIndex; i++) {
result[i - startIndex] = strBytes[i];
}
return string(result);
}
function random(string memory input) internal pure returns (uint256) {
return uint256(keccak256(abi.encodePacked(input)));
}
/**
* @dev Generates a pseudo-random number.
*/
function getRandomNumber(uint16 _upper, uint16 _totalMintedTokens) internal view returns (uint16) {
uint16 rand = uint16(
random(
string(
abi.encodePacked(
_totalMintedTokens,
blockhash(block.number - 1),
block.coinbase,
block.difficulty,
msg.sender
)
)
)
);
return rand % _upper;
}
}
/// [MIT License]
/// @title Base64
/// @notice Provides a function for encoding some bytes in base64
/// @author Brecht Devos <[email protected]>
library Base64 {
bytes internal constant TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
/// @notice Encodes some bytes to the base64 representation
function encode(bytes memory data) internal pure returns (string memory) {
uint256 len = data.length;
if (len == 0) return '';
// multiply by 4/3 rounded up
uint256 encodedLen = 4 * ((len + 2) / 3);
// Add some extra buffer at the end
bytes memory result = new bytes(encodedLen + 32);
bytes memory table = TABLE;
assembly {
let tablePtr := add(table, 1)
let resultPtr := add(result, 32)
for {
let i := 0
} lt(i, len) {
} {
i := add(i, 3)
let input := and(mload(add(data, i)), 0xffffff)
let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))
out := shl(224, out)
mstore(resultPtr, out)
resultPtr := add(resultPtr, 4)
}
switch mod(len, 3)
case 1 {
mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
}
case 2 {
mstore(sub(resultPtr, 1), shl(248, 0x3d))
}
mstore(result, encodedLen)
}
return string(result);
}
}