js如何使用canvas鼠标拖动绘制方块并且可拖动？
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Canvas拖动方块</title>
</head>
<body>
<canvas id="canvas" width="500" height="500" style="border:1px solid red;"></canvas>
<script>
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
let startX, startY;
let isDrawing = false;
const rects = [];
let selectedSquare = null;
let offsetX, offsetY;
function findSquare(x, y) {
for (let i = rects.length - 1; i >= 0; i--) {
const square = rects[i];
if (x >= square.x && x <= square.x + square.w &&
y >= square.y && y <= square.y + square.h) {
return square;
}
}
return null;
}
canvas.addEventListener('mousedown', (e) => {
const mouseX = e.clientX - canvas.getBoundingClientRect().left;
const mouseY = e.clientY - canvas.getBoundingClientRect().top;
...点击查看剩余70%
by thinkfuture
我知道答案，我要回答
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