farzaa

pragma solidity 0.8.0;


import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "hardhat/console.sol";

// We need to import the helper functions from the contract that we copy/pasted.
import { Base64 } from "./libraries/Base64.sol";

johnoke

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christopher4lis

/**
 * Rotates coordinate system for velocities
 *
 * Takes velocities and alters them as if the coordinate system they're on was rotated
 *
 * @param  Object | velocity | The velocity of an individual particle
 * @param  Float  | angle    | The angle of collision between two objects in radians
 * @return Object | The altered x and y velocities after the coordinate system has been rotated
 */