用 HTML5 绘制人脸
openkk
12年前
<p>先看我们要绘制的人脸效果图：</p> <p><a href="https://simg.open-open.com/show/fe05793f0bafa5837c7b35b1c32fb71c.png" target="_blank"><img style="cursor:pointer;" alt="用 HTML5 绘制人脸" src="https://simg.open-open.com/show/fe05793f0bafa5837c7b35b1c32fb71c.png" width="500" height="500" /></a></p> <p>你可以在线查看效果：<a href="/misc/goto?guid=4959499347626123615" rel="nofollow" target="_blank">在线演示</a></p> <p>这里主要使用了 HTML5 的 Canvas 进行绘制。</p> <p>下面我们开始整个绘制过程：</p> <p>1. HTML (index.html)</p> <pre class="brush:html; toolbar: true; auto-links: false;"><!DOCTYPE html> <html lang="en" > <head> <meta charset="utf-8" /> <title>HTML5 Face Builder | Script Tutorials</title> <link href="css/main.css" rel="stylesheet" type="text/css" /> <script src="http://code.jquery.com/jquery-latest.min.js"></script> <script type="text/javascript" src="js/script.js"></script> </head> <body> <header> <h2>HTML5 image crop tool</h2> <a href="http://www.script-tutorials.com/html5-face-builder/" class="stuts">Back to original tutorial on <span>Script Tutorials</span></a> </header> <div class="container"> <canvas id="scene" width="500" height="500"></canvas> <div id="results"> <h2>Use arrow keys to select your face details (up-down to select category, left-right to switch them), then click Spacebar to export as image.</h2> <img id="face_result" /> </div> </div> </body> </html></pre> <p>2. js/script.js</p> <pre class="brush:js; toolbar: true; auto-links: false;">// inner variables var canvas, ctx; var oHead, oEye, oNose, oMouth; var iSel = 0; // ------------------------------------------------------------- // objects : function Head(x, y, x2, y2, w, h, image) { this.x = x; this.y = y; this.x2 = x2; this.y2 = y2; this.w = w; this.h = h; this.image = image; this.iSpr = 0; } function Eye(x, y, x2, y2, w, h, image) { this.x = x; this.y = y; this.x2 = x2; this.y2 = y2; this.w = w; this.h = h; this.image = image; this.iSpr = 0; } function Nose(x, y, x2, y2, w, h, image) { this.x = x; this.y = y; this.x2 = x2; this.y2 = y2; this.w = w; this.h = h; this.image = image; this.iSpr = 0; } function Mouth(x, y, x2, y2, w, h, image) { this.x = x; this.y = y; this.x2 = x2; this.y2 = y2; this.w = w; this.h = h; this.image = image; this.iSpr = 0; } // ------------------------------------------------------------- // draw functions : function clear() { // clear canvas function ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height); } function drawScene() { // main drawScene function clear(); // clear canvas // draw head ctx.drawImage(oHead.image, oHead.x2 + oHead.iSpr*oHead.w, oHead.y2, oHead.w, oHead.h, oHead.x, oHead.y, oHead.w, oHead.h); // draw eyes ctx.drawImage(oEye.image, oEye.x2 + oEye.iSpr*oEye.w, oEye.y2, oEye.w, oEye.h, oEye.x, oEye.y, oEye.w, oEye.h); // draw nose ctx.drawImage(oNose.image, oNose.x2 + oNose.iSpr*oNose.w, oNose.y2, oNose.w, oNose.h, oNose.x, oNose.y, oNose.w, oNose.h); // draw mouth ctx.drawImage(oMouth.image, oMouth.x2 + oMouth.iSpr*oMouth.w, oMouth.y2, oMouth.w, oMouth.h, oMouth.x, oMouth.y, oMouth.w, oMouth.h); // draw controls ctx.textAlign = 'center'; ctx.fillStyle = '#000'; ctx.font = '30px Verdana'; if (iSel == 0) ctx.font = 'bold 30px Verdana'; ctx.fillText('< Head >', 400, 80); ctx.font = '30px Verdana'; if (iSel == 1) ctx.font = 'bold 30px Verdana'; ctx.fillText('< Eye >', 400, 180); ctx.font = '30px Verdana'; if (iSel == 2) ctx.font = 'bold 30px Verdana'; ctx.fillText('< Nose >', 400, 280); ctx.font = '30px Verdana'; if (iSel == 3) ctx.font = 'bold 30px Verdana'; ctx.fillText('< Mouth >', 400, 380); } // ------------------------------------------------------------- // initialization $(function(){ canvas = document.getElementById('scene'); ctx = canvas.getContext('2d'); // initialization of dragon var oHeadImage = new Image(); oHeadImage.src = 'images/image.png'; oHeadImage.onload = function() {}; oHead = new Head(0, 0, 0, 755, 300, 405, oHeadImage); oEye = new Eye(40, 70, 0, 120, 235, 80, oHeadImage); oNose = new Nose(70, 120, 0, 276, 180, 140, oHeadImage); oMouth = new Mouth(60, 260, 0, 546, 170, 120, oHeadImage); $(window).keydown(function(event){ switch (event.keyCode) { case 38: // Up key iSel--; if (iSel < 0) { iSel = 3; } break; case 40: // Up key iSel++; if (iSel >= 4) { iSel = 0; } break; case 37: // Left key // update sprite positions if (iSel == 0) { oHead.iSpr--; if (oHead.iSpr < 0) { oHead.iSpr = 3; } } if (iSel == 1) { oEye.iSpr--; if (oEye.iSpr < 0) { oEye.iSpr = 4; } } if (iSel == 2) { oNose.iSpr--; if (oNose.iSpr < 0) { oNose.iSpr = 4; } } if (iSel == 3) { oMouth.iSpr--; if (oMouth.iSpr < 0) { oMouth.iSpr = 4; } } break; case 39: // Right key // update sprite positions if (iSel == 0) { oHead.iSpr++; if (oHead.iSpr >= 4) { oHead.iSpr = 0; } } if (iSel == 1) { oEye.iSpr++; if (oEye.iSpr >= 5) { oEye.iSpr = 0; } } if (iSel == 2) { oNose.iSpr++; if (oNose.iSpr >= 5) { oNose.iSpr = 0; } } if (iSel == 3) { oMouth.iSpr++; if (oMouth.iSpr >= 5) { oMouth.iSpr = 0; } } break; case 32: // Spacebar key - export results var temp_ctx, temp_canvas; temp_canvas = document.createElement('canvas'); temp_ctx = temp_canvas.getContext('2d'); temp_canvas.width = 360; temp_canvas.height = 410; // draw head temp_ctx.drawImage(oHead.image, oHead.iSpr*oHead.w, oHead.y2, oHead.w, oHead.h, oHead.x, oHead.y, oHead.w, oHead.h); // draw eyes temp_ctx.drawImage(oEye.image, oEye.iSpr*oEye.w, oEye.y2, oEye.w, oEye.h, oEye.x, oEye.y, oEye.w, oEye.h); // draw nose temp_ctx.drawImage(oNose.image, oNose.iSpr*oNose.w, oNose.y2, oNose.w, oNose.h, oNose.x, oNose.y, oNose.w, oNose.h); // draw mouth temp_ctx.drawImage(oMouth.image, oMouth.iSpr*oMouth.w, oMouth.y2, oMouth.w, oMouth.h, oMouth.x, oMouth.y, oMouth.w, oMouth.h); var vData = temp_canvas.toDataURL(); $('#face_result').attr('src', vData); break; } }); setInterval(drawScene, 40); // loop drawScene });</pre> <p>你也可以<a href="/misc/goto?guid=4959499347714540240" rel="nofollow" target="_blank">下载源码</a>到本地来测试。</p>