HTML5实现星球大战中空间飞行器围绕死星飞行与激光武器动画效果源码.zip资源-CSDN文库

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171 浏览量 2022-11-04 23:41:32 上传评论收藏 898KB ZIP 举报

HTML5是一种强大的网页开发技术，它极大地扩展了Web应用程序的功能，使得开发者能够创建出更为丰富、动态和交互式的用户体验。这个压缩包中的源码显然利用了HTML5的一些关键特性，特别是Canvas元素，来实现了星球大战中空间飞行器围绕死星飞行以及激光武器的动画效果。以下是对这些知识点的详细解释： 1. **Canvas API**：HTML5的Canvas是网页上的一个可编程区域，允许通过JavaScript来绘制图形。在这个项目中，Canvas被用作一个画布，开发者可以通过编程方式控制飞行器和激光在上面移动、绘制，从而实现动态的动画效果。 2. **JavaScript**：作为HTML5的核心，JavaScript用于处理页面上的交互和动态内容。在这个场景中，JavaScript负责更新飞行器的位置、计算它们的运动轨迹、发射激光以及处理碰撞检测等。 3. **CSS3**：虽然主要依赖Canvas，但CSS3也可能被用来增强页面的样式，比如背景、字体、过渡和动画效果。可能用于设置界面的整体风格或者飞行器的静态外观。 4. **Web Animation API**：这是一种在JavaScript中创建和控制动画的新方法，可以更高效地管理动画的生命周期和性能。在这个案例中，可能用于优化飞行器和激光的动画效果。 5. **事件监听**：JavaScript的事件监听机制用于响应用户的交互，如点击、触摸或键盘输入。在游戏或动画中，这可以用来触发激光发射或其他交互行为。 6. **请求AnimationFrame**：为了流畅地渲染动画，开发者通常会使用requestAnimationFrame函数，它告诉浏览器何时应该重新绘制屏幕。这样可以确保在下一次重绘之前执行必要的计算，提供平滑的动画体验。 7. **对象和类**：在JavaScript中，对象和类用于封装数据和功能，便于代码的组织和复用。飞行器和激光可能会被定义为类，每个实例有自己的属性（如位置、速度）和方法（如移动、绘制）。 8. **碰撞检测**：为了实现飞行器与死星之间的碰撞检测，开发者可能使用了不同的算法，如轴对齐边界框(AABB)或更复杂的碰撞检测方法。 9. **音频API**：HTML5的Audio API允许在网页中嵌入和播放音频，可能在激光击中目标或特定事件发生时播放音效，增加沉浸感。 10. **响应式设计**：考虑到不同的设备和屏幕尺寸，代码可能采用了响应式设计，确保在手机、平板电脑和桌面电脑上都能良好运行。这个源码项目展示了HTML5在创建互动游戏和动画方面的潜力，结合JavaScript和Canvas API，可以实现复杂而引人入胜的视觉效果。通过学习和理解这个项目，开发者可以提升自己在Web开发中的动态图形和交互设计能力。

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HTML5实现星球大战中空间飞行器围绕死星飞行与激光武器动画效果源码.zip （3个子文件）

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images

spaceship.jpg 1013KB

DeathStar2.jpg 11KB

index.html 12KB

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>HTML5 星球大战空间飞行器围绕死星飞行/激光武器动画</title> <style> html, body { width: 100%; /* The universe is black */ height: 100%; background-color: black; } #sun { /* Positions the top-left corner of the image to be * /* in the middle of the box */ position: absolute; top: 50%; left: 50%; border-color: black; border-width: 2px; border-style: solid; border-radius: 50%; /* Play with these numbers to see what it does */ box-shadow: 0 0 64px black; height: 200px; width: 200px; margin-top: -100px; margin-left: -100px; } #earth { position: absolute; top: 0; left: 50%; height: 50px; width: 50px; margin-left: -25px; margin-top: -25px; } #earth-orbit { position: absolute; top: 70%; left: 50%; width: 500px; height: 500px; margin-top: -250px; margin-left: -250px; border-width: 2px; border-style: dotted; border-color: black; border-radius: 50%; -webkit-animation: spin-right 100s linear infinite; -moz-animation: spin-right 10s linear infinite; -ms-animation: spin-right 10s linear infinite; -o-animation: spin-right 10s linear infinite; animation: spin-right 10s linear infinite; } @keyframes spin-left { 100% { -webkit-transform: rotate(360deg); -moz-transform: rotate(360deg); -ms-transform: rotate(360deg); -o-transform: rotate(360deg); transform: rotate(360deg); } } @-webkit-keyframes spin-right { 100% { -webkit-transform: rotate(360deg); -moz-transform: rotate(360deg); -ms-transform: rotate(360deg); -o-transform: rotate(360deg); transform: rotate(360deg); } } @keyframes spin-right { 100% { -webkit-transform: rotate(360deg); -moz-transform: rotate(360deg); -ms-transform: rotate(360deg); -o-transform: rotate(360deg); transform: rotate(360deg); } } </style> </head> <body>  <img id="sun" src="images/DeathStar2.jpg">  <div id='earth-orbit'> <img id="earth" src="images/spaceship.jpg"> </div>  <canvas id="canvas">Canvas is not supported in your browser.</canvas> <script> window.requestAnimFrame = (function() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60); }; })(); // now we will setup our basic variables for the demo var canvas = document.getElementById('canvas'), ctx = canvas.getContext('2d'), // full screen dimensions cw = window.innerWidth, ch = window.innerHeight, // firework collection fireworks = [], // particle collection particles = [], // starting hue hue = 120, // when launching fireworks with a click, too many get launched at once without a limiter, one launch per 5 loop ticks limiterTotal = 5, limiterTick = 0, // this will time the auto launches of fireworks, one launch per 80 loop ticks timerTotal = 80, timerTick = 0, mousedown = false, // mouse x coordinate, mx, // mouse y coordinate my; // set canvas dimensions canvas.width = cw; canvas.height = ch; // now we are going to setup our function placeholders for the entire demo // get a random number within a range function random(min, max) { return Math.random() * (max - min) + min; } // calculate the distance between two points function calculateDistance(p1x, p1y, p2x, p2y) { var xDistance = p1x - p2x, yDistance = p1y - p2y; return Math.sqrt(Math.pow(xDistance, 2) + Math.pow(yDistance, 2)); } // create firework function Firework(sx, sy, tx, ty) { // actual coordinates this.x = sx; this.y = sy; // starting coordinates this.sx = sx; this.sy = sy; // target coordinates this.tx = tx; this.ty = ty; // distance from starting point to target this.distanceToTarget = calculateDistance(sx, sy, tx, ty); this.distanceTraveled = 0; // track the past coordinates of each firework to create a trail effect, increase the coordinate count to create more prominent trails this.coordinates = []; this.coordinateCount = 3; // populate initial coordinate collection with the current coordinates while (this.coordinateCount--) { this.coordinates.push([this.x, this.y]); } this.angle = Math.atan2(ty - sy, tx - sx); this.speed = 2; this.acceleration = 1.05; this.brightness = random(50, 70); // circle target indicator radius this.targetRadius = 1; } // update firework Firework.prototype.update = function(index) { // remove last item in coordinates array this.coordinates.pop(); // add current coordinates to the start of the array this.coordinates.unshift([this.x, this.y]); // cycle the circle target indicator radius if (this.targetRadius < 8) { this.targetRadius += 0.3; } else { this.targetRadius = 1; } // speed up the firework this.speed *= this.acceleration; // get the current velocities based on angle and speed var vx = Math.cos(this.angle) * this.speed, vy = Math.sin(this.angle) * this.speed; // how far will the firework have traveled with velocities applied? this.distanceTraveled = calculateDistance(this.sx, this.sy, this.x + vx, this.y + vy); // if the distance traveled, including velocities, is greater than the initial distance to the target, then the target has been reached if (this.distanceTraveled >= this.distanceToTarget) { createParticles(this.tx, this.ty); // remove the firework, use the index passed into the update function to determine which to remove fireworks.splice(index, 1); } else { // target not reached, keep traveling this.x += vx; this.y += vy; } } // draw firework Firework.prototype.draw = function() { ctx.beginPath(); // move to the last tracked coordinate in the set, then draw a line to the current x and y ctx.moveTo(this.coordinates[this.coordinates.length - 1][0], this.coordinates[this.coordinates.length - 1][1]); ctx.lineTo(this.x, this.y); ctx.strokeStyle = 'hsl(' + hue + ', 100%, ' + this.brightness + '%)'; ctx.stroke(); ctx.beginPath(); // draw the target for this firework with a pulsing circle ctx.arc(this.tx, this.ty, this.targetRadius, 0, Math.PI * 2); ctx.stroke(); } // create particle function Particle(x, y) { this.x = x; this.y = y; // track the past coordinates of each particle to create a trail effect, increase the coordinate count to create more prominent trails this.coordinates = []; this.coordinateCount = 5; while (this.coordinateCount--) { this.coordinates.push([this.x, this.y]); } // set a random angle in all possible directions, in radians this.angle = random(0, Math.PI * 2); this.speed = random(1, 10); // friction will slow the particle down this.friction = 0.95; // gravity will be applied and pull the particle down this.gravity = 1; // set the hue to a random number +-20 of the overall hue variable this.hue = random(hue - 20, hue + 20); this.brightness = random(50, 80); this.alpha = 1

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