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本帖最后由 ckblt 于 2022-2-5 13:11 编辑
我开发了一款画图软件，他的界面是这样的：
好丑……
温馨提示
这款画图软件的画布用的是Canvas，如果你的浏览器不支持Canvas，请换个浏览器！
废话少说，上代码！ <!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>画图</title>
<style>
* {
margin: 0;
padding: 0;
}
body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
flex-direction: column;
}
#picture {
width: 400px;
height: 400px;
border: solid 1px #000;
}
#picture canvas {
width: 100%;
height: 100%;
}
#color,
#line-width,
#pen,
#production {
margin-bottom: 10px;
}
#production {
text-align: end;
}
#production h1 {
font-size: 2.5rem;
}
#production p {
font-size: 0.5rem;
}
/* 本作品未得作者允许禁止转载 Ckblt */
</style>
</head>
<body>
<div id="production">
<h1>画图</h1>
<p>By Ckblt</p>
</div>
<div id="color">颜色: <input type="color" /></div>
<div id="line-width">线条粗细: <input type="range" min="3" max="50" /></div>
<div id="pen">
<input type="radio" name="pen" value="pen" checked />
<label>笔</label>
<input type="radio" name="pen" value="eraser" />
<label>橡皮</label>
</div>
<div id="picture">
<canvas width="400" height="400"></canvas>
</div>
<script>
let mousedown = false
let mouseXY = [0, 0]
let picture = []
let color = ''
let lineWidth = 10
let temp = []
let pen = 'pen'
const ctx = document.querySelector('#picture canvas').getContext('2d')
let i = 0
document.querySelector('#picture').addEventListener('mousedown', (ev) => {
temp = []
mousedown = true
ctx.moveTo(...mouseXY)
ctx.beginPath()
})
document.querySelector('#picture').addEventListener('mousemove', (ev) => {
if (mousedown && i >= 1) {
mouseXY = [ev.offsetX, ev.offsetY]
temp.push(mouseXY)
color = document.querySelector('#color input').value
lineWidth = document.querySelector('#line-width input').value
ctx.lineTo(...mouseXY)
ctx.strokeStyle = pen === 'eraser' ? '#fff' : color
ctx.lineWidth = lineWidth
ctx.stroke()
i -= 3
}
i++
})
window.addEventListener('mouseup', () => {
if (mousedown) {
mousedown = false
picture.push({
color: color,
lineWidth: lineWidth,
pen: pen,
content: temp
})
ctx.clearRect(0, 0, 400, 400)
picture.forEach((t) => {
const c = t.content
if (c.length != 0) {
ctx.beginPath()
ctx.moveTo(...c[0])
c.forEach((e) => {
ctx.lineTo(...e)
})
ctx.strokeStyle = t.pen === 'eraser' ? '#fff' : t.color
ctx.lineWidth = t.lineWidth
ctx.stroke()
}
})
}
})
document.getElementsByName('pen').forEach((e) => {
e.addEventListener('click', (ev) => {
pen = e.value
})
})
// 本作品未得作者允许禁止转载 Ckblt
</script>
<!-- 本作品未得作者允许禁止转载 Ckblt -->
</body>
</html>
还是那句话：如果有问题，请回复我哟~ | 
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狗仔卡
发表于 2022-2-5 13:14:19
置顶卡
千斤顶
显身卡
发表于 2022-2-5 17:55:52
楼主