Implementation code of canvas wave effect

The content of this article is about the implementation code of canvas wave effect. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Canvas-based cubic Bezier curve (bezierCurveTo)

<canvas></canvas>

<script>
    var WAVE_HEIGHT = 200 //波浪变化高度
    var SCALE = 0.5 // 绘制速率
    var CYCLE = 360 / SCALE
    var TIME = 0

    function initCanvas() {
        var c = document.getElementById("myCanvas")
        var width = window.screen.width
        var height = window.screen.height

        var ctx = c.getContext("2d")
        c.width = width
        c.height = height

        // start
        window.requestAnimationFrame(function() {
            draw(ctx, width, height)
        })
    }

    function draw(ctx, width, height) {
        ctx.clearRect(0, 0, width, height)

        TIME = (TIME + 1) % CYCLE
        var angle = SCALE * TIME // 当前正弦角度
        var dAngle = 60 // 两个波峰相差的角度

        ctx.beginPath()
        ctx.moveTo(0, height * 0.5 + distance(WAVE_HEIGHT, angle, 0))
        ctx.bezierCurveTo(
            width * 0.4,
            height * 0.5 + distance(WAVE_HEIGHT, angle, dAngle),
            width * 0.6,
            height * 0.5 + distance(WAVE_HEIGHT, angle, 2 * dAngle),
            width,
            height * 0.5 + distance(WAVE_HEIGHT, angle, 3 * dAngle)
        )
        ctx.strokeStyle = "#ff0000"
        ctx.stroke()

        ctx.beginPath()
        ctx.moveTo(0, height * 0.5 + distance(WAVE_HEIGHT, angle, -30))
        ctx.bezierCurveTo(
            width * 0.3,
            height * 0.5 + distance(WAVE_HEIGHT, angle, dAngle - 30),
            width * 0.7,
            height * 0.5 + distance(WAVE_HEIGHT, angle, 2 * dAngle - 30),
            width,
            height * 0.5 + distance(WAVE_HEIGHT, angle, 3 * dAngle - 30)
        )
        ctx.strokeStyle = "#0000ff"
        ctx.stroke()

        function distance(height, currAngle, diffAngle) {
            return height * Math.cos((((currAngle - diffAngle) % 360) * Math.PI) / 180)
        }

        // animate
        window.requestAnimationFrame(function() {
            draw(ctx, width, height)
        })
    }

    initCanvas()
</script>

The above is the detailed content of Implementation code of canvas wave effect. For more information, please follow other related articles on the PHP Chinese website!