分享利用 HTML5 的 Canvas 制作人脸的实例代码
发布时间：2020-07-22 编辑：jiaochengji.com
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这里主要使用了 HTML5 的 Canvas 进行绘制。利用html5制作人脸的实例代码。
先看我们要绘制的人脸效果图：
这里主要使用了 HTML5 的 Canvas 进行绘制。
下面我们开始整个绘制过程：
1. HTML (index.html)
<!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>
<p class="container">
<canvas id="scene" width="500" height="500"></canvas>
<p 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" />
</p>
</p>
</body>
</html>2. js/script.js
// 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
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