Nft Standards

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";import "@openzeppelin/contracts/access/Ownable.sol";import "@openzeppelin/contracts/utils/Counters.sol";
contract MyNFT is ERC721URIStorage, ERC721Enumerable, Ownable {    using Counters for Counters.Counter;    Counters.Counter private _tokenIds;
    uint256 public constant MAX_SUPPLY = 10000;    uint256 public constant MINT_PRICE = 0.08 ether;    uint256 public constant MAX_PER_MINT = 20;
    constructor() ERC721("MyNFT", "MNFT") {}
    function mint(uint256 quantity) external payable {        require(quantity > 0 && quantity <= MAX_PER_MINT, "Invalid quantity");        require(_tokenIds.current() + quantity <= MAX_SUPPLY, "Exceeds max supply");        require(msg.value >= MINT_PRICE * quantity, "Insufficient payment");
        for (uint256 i = 0; i < quantity; i++) {            _tokenIds.increment();            uint256 newTokenId = _tokenIds.current();            _safeMint(msg.sender, newTokenId);            _setTokenURI(newTokenId, generateTokenURI(newTokenId));        }    }
    function generateTokenURI(uint256 tokenId) internal pure returns (string memory) {        // Return IPFS URI or on-chain metadata        return string(abi.encodePacked("ipfs://QmHash/", Strings.toString(tokenId), ".json"));    }
    // Required overrides    function _beforeTokenTransfer(        address from,        address to,        uint256 tokenId,        uint256 batchSize    ) internal override(ERC721, ERC721Enumerable) {        super._beforeTokenTransfer(from, to, tokenId, batchSize);    }
    function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {        super._burn(tokenId);    }
    function tokenURI(uint256 tokenId) public view override(ERC721, ERC721URIStorage) returns (string memory) {        return super.tokenURI(tokenId);    }
    function supportsInterface(bytes4 interfaceId)        public        view        override(ERC721, ERC721Enumerable)        returns (bool)    {        return super.supportsInterface(interfaceId);    }
    function withdraw() external onlyOwner {        payable(owner()).transfer(address(this).balance);    }}

// SPDX-License-Identifier: MITpragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";import "@openzeppelin/contracts/access/Ownable.sol";
contract GameItems is ERC1155, Ownable {    uint256 public constant SWORD = 1;    uint256 public constant SHIELD = 2;    uint256 public constant POTION = 3;
    mapping(uint256 => uint256) public tokenSupply;    mapping(uint256 => uint256) public maxSupply;
    constructor() ERC1155("ipfs://QmBaseHash/{id}.json") {        maxSupply[SWORD] = 1000;        maxSupply[SHIELD] = 500;        maxSupply[POTION] = 10000;    }
    function mint(        address to,        uint256 id,        uint256 amount    ) external onlyOwner {        require(tokenSupply[id] + amount <= maxSupply[id], "Exceeds max supply");
        _mint(to, id, amount, "");        tokenSupply[id] += amount;    }
    function mintBatch(        address to,        uint256[] memory ids,        uint256[] memory amounts    ) external onlyOwner {        for (uint256 i = 0; i < ids.length; i++) {            require(tokenSupply[ids[i]] + amounts[i] <= maxSupply[ids[i]], "Exceeds max supply");            tokenSupply[ids[i]] += amounts[i];        }
        _mintBatch(to, ids, amounts, "");    }
    function burn(        address from,        uint256 id,        uint256 amount    ) external {        require(from == msg.sender || isApprovedForAll(from, msg.sender), "Not authorized");        _burn(from, id, amount);        tokenSupply[id] -= amount;    }}

contract OnChainNFT is ERC721 {    struct Traits {        uint8 background;        uint8 body;        uint8 head;        uint8 rarity;    }
    mapping(uint256 => Traits) public tokenTraits;
    function tokenURI(uint256 tokenId) public view override returns (string memory) {        Traits memory traits = tokenTraits[tokenId];
        string memory json = Base64.encode(            bytes(                string(                    abi.encodePacked(                        '{"name": "NFT #', Strings.toString(tokenId), '",',                        '"description": "On-chain NFT",',                        '"image": "data:image/svg+xml;base64,', generateSVG(traits), '",',                        '"attributes": [',                        '{"trait_type": "Background", "value": "', Strings.toString(traits.background), '"},',                        '{"trait_type": "Rarity", "value": "', getRarityName(traits.rarity), '"}',                        ']}'                    )                )            )        );
        return string(abi.encodePacked("data:application/json;base64,", json));    }
    function generateSVG(Traits memory traits) internal pure returns (string memory) {        // Generate SVG based on traits        return "...";    }}

import "@openzeppelin/contracts/interfaces/IERC2981.sol";
contract NFTWithRoyalties is ERC721, IERC2981 {    address public royaltyRecipient;    uint96 public royaltyFee = 500; // 5%
    constructor() ERC721("Royalty NFT", "RNFT") {        royaltyRecipient = msg.sender;    }
    function royaltyInfo(uint256 tokenId, uint256 salePrice)        external        view        override        returns (address receiver, uint256 royaltyAmount)    {        return (royaltyRecipient, (salePrice * royaltyFee) / 10000);    }
    function setRoyalty(address recipient, uint96 fee) external onlyOwner {        require(fee <= 1000, "Royalty fee too high"); // Max 10%        royaltyRecipient = recipient;        royaltyFee = fee;    }
    function supportsInterface(bytes4 interfaceId)        public        view        override(ERC721, IERC165)        returns (bool)    {        return interfaceId == type(IERC2981).interfaceId ||               super.supportsInterface(interfaceId);    }}