区块链技术游戏开发

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract GameAsset {
    struct Asset {
        uint256 id;
        string name;
        uint256 price;
        address owner;
    }

    Asset[] public assets;
    mapping(uint256 => address) public assetToOwner;

    event AssetAdded(uint256 id, string name, uint256 price, address owner);
    event AssetSold(uint256 id, address buyer, uint256 price);

    function addAsset(string memory _name, uint256 _price) public {
        uint256 id = assets.length;
        assets.push(Asset(id, _name, _price, msg.sender));
        assetToOwner[id] = msg.sender;
        emit AssetAdded(id, _name, _price, msg.sender);
    }

    function buyAsset(uint256 _id) public payable {
        Asset storage asset = assets[_id];
        require(asset.owner != address(0), "Asset does not exist");
        require(msg.value >= asset.price, "Insufficient funds");
        require(asset.owner != msg.sender, "You already own this asset");

        payable(asset.owner).transfer(msg.value);
        asset.owner = msg.sender;
        emit AssetSold(_id, msg.sender, msg.value);
    }
}