


Perhaps you have seen the HTML5 image breaking animation special effects, and the principle of implementation is quite simple. But you may have never seen that videos can be broken and reorganized. This HTML5 animation uses the related features of Canvas to achieve the effect of breaking and reorganizing videos with a click of the mouse. Click the mouse in the video area to break the video in that area. After a period of time, the broken area can be reorganized and restored, and the visual effect is great.
Online demo source code download
HTML code
<p style="display:none"> <video id="sourcevid" autoplay="true" loop="true"> <source src="BigBuckBunny_640x360.mp4" type="video/mp4"/> <source src="BigBuckBunny_640x360.ogv" type="video/ogg"/> </video> <canvas id="sourcecopy" width="640" height="360"></canvas> </p> <p> <center> <p style="z-index:1;position:relative;text-align:center;font-size:16px;font-weight:bold;width:1000px;top:60px;">Click video to blow it up!</p> <canvas id="output" width="1000" height="600" onmousedown="dropBomb(event, this)" style="border: 0 none"> </canvas> </center> </p>
JavaScript code
var video; var copy; var copycanvas; var draw; var TILE_WIDTH = 32; var TILE_HEIGHT = 24; var TILE_CENTER_WIDTH = 16; var TILE_CENTER_HEIGHT = 12; var SOURCERECT = {x:0, y:0, width:0, height:0}; var PAINTRECT = {x:0, y:0, width:1000, height:600}; function init(){ video = document.getElementById('sourcevid'); copycanvas = document.getElementById('sourcecopy'); copy = copycanvas.getContext('2d'); var outputcanvas = document.getElementById('output'); draw = outputcanvas.getContext('2d'); setInterval("processFrame()", 33); } function createTiles(){ var offsetX = TILE_CENTER_WIDTH+(PAINTRECT.width-SOURCERECT.width)/2; var offsetY = TILE_CENTER_HEIGHT+(PAINTRECT.height-SOURCERECT.height)/2; var y=0; while(y < SOURCERECT.height){ var x=0; while(x < SOURCERECT.width){ var tile = new Tile(); tile.videoX = x; tile.videoY = y; tile.originX = offsetX+x; tile.originY = offsetY+y; tile.currentX = tile.originX; tile.currentY = tile.originY; tiles.push(tile); x+=TILE_WIDTH; } y+=TILE_HEIGHT; } } var RAD = Math.PI/180; var randomJump = false; var tiles = []; var debug = false; function processFrame(){ if(!isNaN(video.duration)){ if(SOURCERECT.width == 0){ SOURCERECT = {x:0,y:0,width:video.videoWidth,height:video.videoHeight}; createTiles(); } //this is to keep my sanity while developing if(randomJump){ randomJump = false; video.currentTime = Math.random()*video.duration; } //loop if(video.currentTime == video.duration){ video.currentTime = 0; } } var debugStr = ""; //copy tiles copy.drawImage(video, 0, 0); draw.clearRect(PAINTRECT.x, PAINTRECT.y,PAINTRECT.width,PAINTRECT.height); for(var i=0; i<tiles.length; i++){ var tile = tiles[i]; if(tile.force > 0.0001){ //expand tile.moveX *= tile.force; tile.moveY *= tile.force; tile.moveRotation *= tile.force; tile.currentX += tile.moveX; tile.currentY += tile.moveY; tile.rotation += tile.moveRotation; tile.rotation %= 360; tile.force *= 0.9; if(tile.currentX <= 0 || tile.currentX >= PAINTRECT.width){ tile.moveX *= -1; } if(tile.currentY <= 0 || tile.currentY >= PAINTRECT.height){ tile.moveY *= -1; } }else if(tile.rotation != 0 || tile.currentX != tile.originX || tile.currentY != tile.originY){ //contract var diffx = (tile.originX-tile.currentX)*0.2; var diffy = (tile.originY-tile.currentY)*0.2; var diffRot = (0-tile.rotation)*0.2; if(Math.abs(diffx) < 0.5){ tile.currentX = tile.originX; }else{ tile.currentX += diffx; } if(Math.abs(diffy) < 0.5){ tile.currentY = tile.originY; }else{ tile.currentY += diffy; } if(Math.abs(diffRot) < 0.5){ tile.rotation = 0; }else{ tile.rotation += diffRot; } }else{ tile.force = 0; } draw.save(); draw.translate(tile.currentX, tile.currentY); draw.rotate(tile.rotation*RAD); draw.drawImage(copycanvas, tile.videoX, tile.videoY, TILE_WIDTH, TILE_HEIGHT, -TILE_CENTER_WIDTH, -TILE_CENTER_HEIGHT, TILE_WIDTH, TILE_HEIGHT); draw.restore(); } if(debug){ debug = false; document.getElementById('trace').innerHTML = debugStr; } } function explode(x, y){ for(var i=0; i<tiles.length; i++){ var tile = tiles[i]; var xdiff = tile.currentX-x; var ydiff = tile.currentY-y; var dist = Math.sqrt(xdiff*xdiff + ydiff*ydiff); var randRange = 220+(Math.random()*30); var range = randRange-dist; var force = 3*(range/randRange); if(force > tile.force){ tile.force = force; var radians = Math.atan2(ydiff, xdiff); tile.moveX = Math.cos(radians); tile.moveY = Math.sin(radians); tile.moveRotation = 0.5-Math.random(); } } tiles.sort(zindexSort); processFrame(); } function zindexSort(a, b){ return (a.force-b.force); } function dropBomb(evt, obj){ var posx = 0; var posy = 0; var e = evt || window.event; if (e.pageX || e.pageY){ posx = e.pageX; posy = e.pageY; }else if (e.clientX || e.clientY) { posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft; posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop; } var canvasX = posx-obj.offsetLeft; var canvasY = posy-obj.offsetTop; explode(canvasX, canvasY); } function Tile(){ this.originX = 0; this.originY = 0; this.currentX = 0; this.currentY = 0; this.rotation = 0; this.force = 0; this.z = 0; this.moveX= 0; this.moveY= 0; this.moveRotation = 0; this.videoX = 0; this.videoY = 0; } /* getPixel return pixel object {r,g,b,a} */ function getPixel(imageData, x, y){ var data = imageData.data; var pos = (x + y * imageData.width) * 4; return {r:data[pos], g:data[pos+1], b:data[pos+2], a:data[pos+3]} } /* setPixel set pixel object {r,g,b,a} */ function setPixel(imageData, x, y, pixel){ var data = imageData.data; var pos = (x + y * imageData.width) * 4; data[pos] = pixel.r; data[pos+1] = pixel.g; data[pos+2] = pixel.b; data[pos+3] = pixel.a; } /* copyPixel faster then using getPixel/setPixel combo */ function copyPixel(sImageData, sx, sy, dImageData, dx, dy){ var spos = (sx + sy * sImageData.width) * 4; var dpos = (dx + dy * dImageData.width) * 4; dImageData.data[dpos] = sImageData.data[spos]; //R dImageData.data[dpos+1] = sImageData.data[spos+1]; //G dImageData.data[dpos+2] = sImageData.data[spos+2]; //B dImageData.data[dpos+3] = sImageData.data[spos+3]; //A } </script>
The above is HTML5 Canvas For a detailed introduction to the broken and reorganized video special effects code, please pay attention to the PHP Chinese website (www.php.cn) for more related content!

HTML5 brings five key improvements: 1. Semantic tags improve code clarity and SEO effects; 2. Multimedia support simplifies video and audio embedding; 3. Form enhancement simplifies verification; 4. Offline and local storage improves user experience; 5. Canvas and graphics functions enhance the visualization of web pages.

The core features of HTML5 include semantic tags, multimedia support, offline storage and local storage, and form enhancement. 1. Semantic tags such as, etc. to improve code readability and SEO effect. 2. Simplify multimedia embedding with labels. 3. Offline storage and local storage such as ApplicationCache and LocalStorage support network-free operation and data storage. 4. Form enhancement introduces new input types and verification properties to simplify processing and verification.

H5 provides a variety of new features and functions, greatly enhancing the capabilities of front-end development. 1. Multimedia support: embed media through and elements, no plug-ins are required. 2. Canvas: Use elements to dynamically render 2D graphics and animations. 3. Local storage: implement persistent data storage through localStorage and sessionStorage to improve user experience.

H5 and HTML5 are different concepts: HTML5 is a version of HTML, containing new elements and APIs; H5 is a mobile application development framework based on HTML5. HTML5 parses and renders code through the browser, while H5 applications need to run containers and interact with native code through JavaScript.

Key elements of HTML5 include,,,,,, etc., which are used to build modern web pages. 1. Define the head content, 2. Used to navigate the link, 3. Represent the content of independent articles, 4. Organize the page content, 5. Display the sidebar content, 6. Define the footer, these elements enhance the structure and functionality of the web page.

There is no difference between HTML5 and H5, which is the abbreviation of HTML5. 1.HTML5 is the fifth version of HTML, which enhances the multimedia and interactive functions of web pages. 2.H5 is often used to refer to HTML5-based mobile web pages or applications, and is suitable for various mobile devices.

HTML5 is the latest version of the Hypertext Markup Language, standardized by W3C. HTML5 introduces new semantic tags, multimedia support and form enhancements, improving web structure, user experience and SEO effects. HTML5 introduces new semantic tags, such as, ,, etc., to make the web page structure clearer and the SEO effect better. HTML5 supports multimedia elements and no third-party plug-ins are required, improving user experience and loading speed. HTML5 enhances form functions and introduces new input types such as, etc., which improves user experience and form verification efficiency.

How to write clean and efficient HTML5 code? The answer is to avoid common mistakes by semanticizing tags, structured code, performance optimization and avoiding common mistakes. 1. Use semantic tags such as, etc. to improve code readability and SEO effect. 2. Keep the code structured and readable, using appropriate indentation and comments. 3. Optimize performance by reducing unnecessary tags, using CDN and compressing code. 4. Avoid common mistakes, such as the tag not closed, and ensure the validity of the code.


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