Question

我想更改这些代码，以便它能够快速响应，并且更改浏览器大小不会成为问题

第一个代码：我需要将其更改为响应

＆＃13;

html, body {
  background: #333;
}
canvas{
  position: absolute;
  width: 100%; height: 100%;
  top: 0; right: 0; bottom: 0; left: 0;
}

＆＃13;

<canvas></canvas>

＆＃13;

var livePatern = {
  canvas: null,
  context: null,
  cols: 0,
  rows: 0,
  colors: [252, 251, 249, 248, 241, 240],
  triangleColors: [],
  destColors: [],
  
  init: function(){
    this.canvas = document.getElementById('canvas');
    this.context = this.canvas.getContext('2d');
    this.cols = Math.floor(document.body.clientWidth / 24);
    this.rows = Math.floor(document.body.clientHeight / 24) + 1;
    
    this.canvas.width = document.body.clientWidth;
    this.canvas.height = document.body.clientHeight;
    
    this.drawBackground();
    this.animate();
  },
  
  drawTriangle: function(x, y, color, inverted){
    inverted = inverted == undefined ? false : inverted;

    this.context.beginPath();
    this.context.moveTo(x, y);
    this.context.lineTo(inverted ? x - 22 : x + 22, y + 11);
    this.context.lineTo(x, y + 22);
    this.context.fillStyle = "rgb("+color+","+color+","+color+")";
    this.context.fill();
    this.context.closePath();
  },
  
  getColor: function(){    
    return this.colors[(Math.floor(Math.random() * 6))];
  },
  
  drawBackground: function(){
    var eq = null;
    var x = this.cols;
    var destY = 0;
    var color, y;
    
    while(x--){
      eq = x % 2;
      y = this.rows;

      while(y--){
        destY = Math.round((y-0.5) * 24);

        this.drawTriangle(x * 24 + 2, eq == 1 ? destY : y * 24, this.getColor());
        this.drawTriangle(x * 24, eq == 1 ? destY  : y * 24, this.getColor(), true);
      }
    }
  },
  
  animate: function(){
    var me = this;

    var x = Math.floor(Math.random() * this.cols);
    var y = Math.floor(Math.random() * this.rows);
    var eq = x % 2;

    if (eq == 1) {
      me.drawTriangle(x * 24, Math.round((y-0.5) * 24) , this.getColor(), true);
    } else {
      me.drawTriangle(x * 24 + 2, y * 24, this.getColor());
    }

    setTimeout(function(){    
      me.animate.call(me);
    }, 10);
  },
};

!function(){livePatern.init();}()

＆＃13;

借调代码：我需要将此更改为响应

＆＃13;

* {
  margin: 0;
  padding: 0;
  min-height: 100%;
  width: 100%;
}

html, body {
  height: 100%;
}

canvas{
  height: 100%;
  width: 100%;
}

＆＃13;

<canvas id="canvas"></canvas>

＆＃13;

window.onresize = function() {

  ctx.clearRect(0,0,canvas.width, canvas.height);

  //call again function;
}

＆＃13;

我想用：

companion object {
    const val FLAG_PAGE_PROCESS = 0L//待处理
    const val FLAG_PAGE_EXCEPTION = 1L//设备异常
    const val FLAG_PAGE_UNCHECKED = 2L//未审核
    const val FLAG_PAGE_AUDIT = 3L//统计
    val FLAG_PAGE = "FLAG_PAGE"

    fun newInstance(@FlagPageDef flagPage: Int): RepairFormsListFragment {
        val fragment = RepairFormsListFragment()
        val args = Bundle()
        fragment.arguments = args
        return fragment
    }

    @Retention(AnnotationRetention.SOURCE)
    @IntDef(FLAG_PAGE_PROCESS, FLAG_PAGE_EXCEPTION, FLAG_PAGE_UNCHECKED, FLAG_PAGE_AUDIT)
    annotation class FlagPageDef
}

但是动画是重复的。

Answer 1

您正在设置加载时画布的大小，并保存所有即将进行的渲染。但相反，你可以做类似的事情;

//pseudo code, including only the idea.
windown.onload = function () {

  var canvas = document.querySelector(...),
      context = canvas.getContext('2d');

  Dots.init();

  function prepareCanvas (w, h) {
    //set width and height
    //do more nessessary stuff
  }

  (function loop () {
    var w = window.innerWidth,
        h = window.innerHeight;

     prepareCanvas(w, h);
     Dots.render(context, w, h);


    window.requestAnimationFrame(loop);
  })();
}

所以基本上，将宽度和高度作为参数添加到渲染方法中，因此显示大小如果发生变化则无关紧要。

更新，由于评论

缓存尺寸，而不是经常发生的尺寸。

window.onload = function () {
  var w, h, resized = true;

  window.addEventListener('resize', function () {
    resized = true;
  });

  (function loop() {
    if (resized) {
      //get w, h
      prepareCanvas(w, h);
      resized = false;
    }

     Dots.render(context, w, h);
  })();

}

通过javascript在画布上绘制响应粒子

1 个答案: