overflow: scroll; } 收起 深色代码主题 复制 // xxx.js import promptAction from '@ohos.promptAction'; export default { data:{ dataURL:null, }, onShow(){ let el = this.$refs.canvas1; let ctx = el.getContext("2d"); ctx.strokeRect(100,100,300,300); }, getUrl(){ let el ...
首先一个游戏类负责资源的加载与渲染,以及定时器的添加 //中介者类class Game {//构造函数constructor(dataJson) {//获取画布this.canvas =document.getElementById(dataJson.canvasId);this.ctx =this.canvas.getContext("2d");this.jsonUrl =dataJson.jsonUrl;//数据对象this.R ={};//定时器this.timer =...
问如何在打印文本中添加CanvasRenderingContext2D原型函数EN我想在CanvasRenderingContext2D上添加一个函数。它...
这个方法的原文在此,具体如下: varcanvas = document.getElementById('myCanvas');varcontext = canvas.getContext('2d');varcenterX = 0;varcenterY = 0;varradius = 50;//save statecontext.save();//translate contextcontext.translate(canvas.width / 2, canvas.height / 2);//scale context horizont...
选择H5游戏引擎的思考维度 1、开发语言的支持 2、2D、3D、VR的支持 3、性能 4、引擎的应用广度 5、...
getContext("2d") 返回一个 CanvasRenderingContext2D 对象,用于绘制 2D 图形。 2. 绘制基本图形 2.1 绘制矩形 fillRect(x, y, width, height): 填充矩形。 strokeRect(x, y, width, height): 绘制矩形边框。 clearRect(x, y, width, height): 清除矩形区域。 ctx.fillStyle = "blue"; // 设置填充颜...
(this, Universe); this.el = element; this.ctx = this.el.getContext('2d'); this.pixelRatio = window.devicePixelRatio; this.time = new Time(); this.worlds = {}; this.world = null; // current state this.updateSize(); window.addEventListener('resize', this.updateSize.bind(this)); ...
onRestoreonRestore is called after the user clicks the Reset item in the Inspector's context menu or performs an undo operation on this component. If the component contains the "internal state", short for "temporary member variables which not included ...
<script>window.requestAnimationFrame=(function(){returnwindow.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||function(callback){window.setTimeout(callback,1000/2);};})();varmyCanvas=document.getElementById("canvas");varctx=myCanvas.getContext("2d");/...
CanvasRenderingContext2D.restore() 是 Canvas 2D API 通过在绘图状态栈中弹出顶端的状态,将 canvas 恢复到最近的保存状态的方法。 如果没有保存状态,此方法不做任何改变。 CanvasRenderingContext2D.save() 是 Canvas 2D API 通过将当前状态放入栈中,保存 canvas 全部状态的方法。