javascript canvas檢測小球碰撞
阿新 • • 發佈:2020-04-20
本文例項為大家分享了javascript canvas實現檢測小球碰撞的具體程式碼,供大家參考,具體內容如下
定義一個canvas標籤
<div class="cnavasInfo"> <canvas id="canvas" width="800" height="500" ></canvas> </div>
函式以及相關的邏輯處理
export default { data() { return { canvas: null,ctx: null,arcObj: {} }; },mounted() { this.canvas = document.getElementById("canvas"); this.ctx = this.canvas.getContext("2d"); // this.move(); // 矩形的邊緣碰撞函式 // this.moveArc(); // 繪製碰撞圓形,物件形式 this.moveRect() },methods: { move() { let x = 0; let y = 0; let width = 100; let height = 100; let speedX = 2; let speedY = 2; let ctx = this.ctx; ctx.fillStyle = "red"; ctx.fillRect(x,y,width,height); setInterval(() => { ctx.clearRect(x,this.canvas.width,this.canvas.height); x += speedX; if (x > this.canvas.width - width) { speedX *= -1; } else if (x < 0) { speedX *= -1; } y += speedY; if (y > this.canvas.height - height) { speedY *= -1; } else if (y < 0) { speedY *= -1; } ctx.fillRect(x,height); },10); // this.requestmove(x,height,ctx,speedX,speedY); // 請求幀的動畫過程 },requestmove(x,speedY) { ctx.clearRect(x,this.canvas.height); x += speedX; if (x > this.canvas.width - width) { speedX *= -1; } else if (x < 0) { speedX *= -1; } y += speedY; if (y > this.canvas.height - height) { speedY *= -1; } else if (y < 0) { speedY *= -1; } ctx.fillRect(x,height); window.requestAnimationFrame( this.requestmove(x,speedY) ); },moveArc(x,r,speedY) { this.x = x; this.y = y; this.r = r; this.speedX = speedX; this.speedY = speedY; this.moveUpdata = function() { this.x += this.speedX; if (this.x > this.canvas.width - this.r) { this.speedX *= -1; } else if (this.x < 0) { this.speedX *= -1; } this.y += this.speedY; if (this.y > this.canvas.height - this.r) { this.speedY *= -1; } else if (this.y < 0) { this.speedY *= -1; } }; },moveRect(){ // 面向物件程式設計 function Rect(x,color,speedY,canvas) { this.x = x; this.y = y; this.width = width; this.height = height; this.color = color this.speedX = speedX this.speedY = speedY this.ctxRect = ctx this.canvas = canvas } Rect.prototype.draw = function() { this.ctxRect.beginPath(); this.ctxRect.fillStyle = this.color this.ctxRect.fillRect(this.x,this.y,this.width,this.height) this.ctxRect.closePath(); } Rect.prototype.move = function() { this.x += this.speedX if(this.x > this.canvas.width - this.width){ this.speedX *= -1 } else if(this.x < 0){ this.speedX *= -1 } this.y += this.speedY if(this.y > this.canvas.height - this.height){ this.speedY *= -1 } else if(this.y < 0){ this.speedY *= -1 } } let rect1 = new Rect(0,100,'red',2,this.ctx,this.canvas) let rect2 = new Rect(300,'blue',-2,this.canvas) // rect1.draw(); // rect2.draw() let animate = ()=>{ this.ctx.clearRect(0,this.canvas.height) rect1.draw() rect1.move() rect2.draw() rect2.move() let rect1Min = rect1.x; let rect1Max = rect1.x + rect1.width let rect2Min = rect2.x let rect2Max = rect2.x + rect2.width let min = Math.max(rect1Min,rect2Min) let max = Math.min(rect1Max,rect2Max) if(min < max){ rect1.speedX *= -1; rect1.speedY *= 1; rect2.speedX *= -1 rect2.speedY *= 1 } window.requestAnimationFrame(animate) } animate() } } };
樣式控制
#canvas { border: 1px solid black; }
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支援我們。