前端开发canvas绘制爱心

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html 代码

<!DOCTYPE html>
<html lang=”en”>
    <head>
        <meta charset=”UTF-8″ />
        <title>Happy Valentine’s Day everyone !</title>
    </head>
    <style>
        body {
            overflow: hidden;
            margin: 0;
        }
        h1 {
            position: fixed;
            top: 50%;
            left: 0;
            width: 100%;
            text-align: center;
            transform: translateY(-50%);
            font-family: ‘Love Ya Like A Sister’, cursive;
            font-size: 40px;
            color: #c70012;
            padding: 0 20px;
        }
        @media (min-width: 1200px) {
            h1 {
                font-size: 60px;
            }
        }
    </style>
    <body>
        <canvas></canvas>
        <h1>Happy Valentine’s Day everyone !</h1>
        <script>
            var canvas = document.querySelector(‘canvas’),
                ctx = canvas.getContext(‘2d’)
            var ww, wh
            function onResize() {
                ww = canvas.width = window.innerWidth
                wh = canvas.height = window.innerHeight
            }
            ctx.strokeStyle = ‘red’
            ctx.shadowBlur = 25
            ctx.shadowColor = ‘hsla(0, 100%, 60%,0.5)’
            var precision = 100
            var hearts = []
            var mouseMoved = false
            function onMove(e) {
                mouseMoved = true
                if (e.type === ‘touchmove’) {
                    hearts.push(
                        new Heart(e.touches[0].clientX, e.touches[0].clientY),
                    )
                    hearts.push(
                        new Heart(e.touches[0].clientX, e.touches[0].clientY),
                    )
                } else {
                    hearts.push(new Heart(e.clientX, e.clientY))
                    hearts.push(new Heart(e.clientX, e.clientY))
                }
            }
            var Heart = function(x, y) {
                this.x = x || Math.random() * ww
                this.y = y || Math.random() * wh
                this.size = Math.random() * 2 + 1
                this.shadowBlur = Math.random() * 10
                this.speedX = (Math.random() + 0.2 – 0.6) * 8
                this.speedY = (Math.random() + 0.2 – 0.6) * 8
                this.speedSize = Math.random() * 0.05 + 0.01
                this.opacity = 1
                this.vertices = []
                for (var i = 0; i < precision; i++) {
                    var step = (i / precision – 0.5) * (Math.PI * 2)
                    var vector = {
                        x: 15 * Math.pow(Math.sin(step), 3),
                        y: -(
                            13 * Math.cos(step) –
                            5 * Math.cos(2 * step) –
                            2 * Math.cos(3 * step) –
                            Math.cos(4 * step)
                        ),
                    }
                    this.vertices.push(vector)
                }
            }
            Heart.prototype.draw = function() {
                this.size -= this.speedSize
                this.x += this.speedX
                this.y += this.speedY
                ctx.save()
                ctx.translate(-1000, this.y)
                ctx.scale(this.size, this.size)
                ctx.beginPath()
                for (var i = 0; i < precision; i++) {
                    var vector = this.vertices[i]
                    ctx.lineTo(vector.x, vector.y)
                }
                ctx.globalAlpha = this.size
                ctx.shadowBlur = Math.round((3 – this.size) * 10)
                ctx.shadowColor = ‘hsla(0, 100%, 60%,0.5)’
                ctx.shadowOffsetX = this.x + 1000
                ctx.globalCompositeOperation = ‘screen’
                ctx.closePath()
                ctx.fill()
                ctx.restore()
            }
            function render(a) {
                requestAnimationFrame(render)
                hearts.push(new Heart())
                ctx.clearRect(0, 0, ww, wh)
                for (var i = 0; i < hearts.length; i++) {
                    hearts[i].draw()
                    if (hearts[i].size <= 0) {
                        hearts.splice(i, 1)
                        i–
                    }
                }
            }
            onResize()
            window.addEventListener(‘mousemove’, onMove)
            window.addEventListener(‘touchmove’, onMove)
            window.addEventListener(‘resize’, onResize)
            requestAnimationFrame(render)
        </script>
    </body>
</html>
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