janvas实现canvas华为鸿蒙操作系统开机动画效果代码-html代码-BFW代码库

janvas实现canvas华为鸿蒙操作系统开机动画效果代码

代码语言：html

所属分类：动画

代码描述：janvas实现canvas华为鸿蒙操作系统开机动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开


<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">
<style>
    body{
        background: black;
    }
</style>

</head>

<body  >
  <div id="app"></div>

<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/janvas.js"></script>


  
      <script >
new janvas.Canvas({
  container: "#app",
  duration: 4000,
  width: 800,
  height: 400,
  props: {
    leftText: "Harmony",
    centerText: "O",
    rightText: "S"
  },
  methods: {
    init: function () {
      var ctx = this.$ctx, w = this.$width, h = this.$height,
        font = w / 2 + "px sans-serif", blur = w / 10;
      this.bg = new janvas.Rect(ctx, 0, 0, w, h);
      this.top = new janvas.Rect(ctx, 0, 0, w, h / 2);
      this.bottom = new janvas.Rect(ctx, 0, h / 2, w, h / 2);
      this.centerTop = this._getText(w / 2, h / 2, this.centerText, font, "center", blur);
      var offsetY = h / 2 - (this.centerTop.getTop() + this.centerTop.getBottom()) / 2,
        startY = h / 2 + offsetY;
      this.centerTop.setStartY(startY);
      this.centerBottom = this._getText(w / 2, startY, this.centerText, font, "center", blur);
      var centerWidth = this.centerTop.getWidth();
      this.centerTop.getMatrix().setOffsetY(centerWidth / 2);
      this.centerBottom.getMatrix().setOffsetY(-centerWidth / 2);
      this.left = this._getText(w / 2 - centerWidth / 2, startY, this.leftText, font, "right");
      this.right = this._getText(w / 2 + centerWidth / 2, startY, this.rightText, font, "left");
      var targetScale = w * 0.8 / (this.right.getRight() - this.left.getLeft()),
        originX = (this.left.getLeft() * targetScale - w * 0.1) / (targetScale - 1),
        originY = h / 2;
      this.line = new janvas.Line(ctx, -w / 100, originY + w / 4, -w / 100, originY + w / 4);
      this.line.getStyle().setLineWidth(w / 50).setStrokeStyle("rgb(0, 128, 255)").setLineCap("round");
      this._transforms = [this.centerTop, this.centerBottom, this.left, this.right, this.line];
      for (var i = 0; i < this._transforms.length; i++) {
        this._transforms[i].setOrigin(originX, originY);
      }
      this.shadow = new janvas.Arc(ctx, w / 2, h / 2, 0).setOrigin(w / 2, h / 2);
      var grd = janvas.Utils.createRadialGradient(0, 0, 0, 0, 0, centerWidth, this.shadow),
        sep = 0.2;
      grd.a.........完整代码请登录后点击上方下载按钮下载查看