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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>imageDraw</title>
<meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1">
<script src="http://hammerjs.github.io/dist/hammer.js"></script>
<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>
<script src="./js/jquery.js"></script>
</head>
<body>
<canvas id="canvas" style="transform: rotate(0deg);">
</canvas>
<div id="tips"></div>
<br/>
<div id="toImgUrl">生成图片</div>
<img id="newImg" src="">
</body>
<script>
document.body.addEventListener('touchmove', function (event) {
event.preventDefault();
}, false);
jQuery(document).ready(function($) {
var url= location.href;
var appId="";
var timestamp="";
var nonceStr="";
var signature="";
var urlBack="";
$.ajax({
type: 'GET',
url:'http://hyundai.koo7.com/index.php/jsonBack',
data:{"url":url},
dataType: 'json',
async: false,
success: function(data) {
appId=data.appId;
timestamp=data.timestamp;
nonceStr=data.nonceStr;
signature=data.signature;
urlBack=data.url;
wx.config({
//debug: true,
appId:appId,
timestamp: timestamp,
nonceStr: nonceStr,
signature: signature,
jsApiList: [
'checkJsApi',
'onMenuShareTimeline',
'onMenuShareAppMessage',
'onMenuShareQQ',
'onMenuShareWeibo',
'chooseImage',
'uploadImage'
]
});
}
});
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
canvas.width = document.body.clientWidth;
canvas.height = 300;
var WIDTH = canvas.width;
var HEIGHT = canvas.height;
var img = new Image();
var liveScale = 1;
var currentRotation = 0;
var hammertime = new Hammer(canvas);
hammertime.get('rotate').set({ enable: true });
hammertime.get('pinch').set({ enable: true });
hammertime.get('pan').set({ direction: Hammer.DIRECTION_ALL });
$("#toImgUrl").click(function(event) {
/* Act on the event */
//console.log(canvas);
console.log(canvas.toDataURL("image/png"));
$("#newImg").attr("src",canvas.toDataURL("image/png"));
});
var outerImg = new Image();
//outerImg.src = "./images/1.png";
wx.ready(function () {
outerImg.src = "./images/1.png";
outerImg.onload = function(){
ctx.drawImage(outerImg,0,0,WIDTH,HEIGHT);
$("#canvas").one('click', function(event) {
/* Act on the event */
//img.src = "./images/360205246780165223b.jpg";
//return false;
wx.chooseImage({
count: 1, // 默认9
sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
success: function (res) {
var localIds = res.localIds; // 返回选定照片的本地ID列表，localId可以作为img标签的src属性显示图片
img.src = localIds;
//img.crossOrigin = 'anonymous';
//img.src = 'http://img.mukewang.com/566523440001a31c02990201-210-130.jpg';
//console.log(localIds);
img.src = "./images/360205246780165223b.jpg";
//img.src = "./images/DSC06147.JPG";
//因为canvas不同源存在跨域问题，后端需要提供一个接口，需要把上传到微信服务器的图片，拉取到客户自己的服务器，再把地址返给前端。
//
}
});
});
}
//return false;
//img.src = "./images/360205246780165223b.jpg"
img.onload = function(e){
var imgWidth = img.width,
imgHeight = img.height,
rC = WIDTH / HEIGHT,
rI = imgWidth / imgHeight,
w,
y,
cImg = {
r : 0, //旋转
x : 0,
y : 0,
w : WIDTH,
h : HEIGHT,
f : 0, //0长宽相等，1比c高，2比c宽,
c : 1, //缩放
rx : .5,
ry : .5
};
if (rC > rI){
//如果图片的长宽比比canvas的小
h = WIDTH / rI;
cImg.y = (HEIGHT - h)/2 - HEIGHT/2 ;
cImg.x = WIDTH / -2;
cImg.h = h;
cImg.f = 1;
}
else if (rC < rI){
//如果图片的长宽比比canvas的大
w = HEIGHT * rI;
cImg.x = (WIDTH-w)/2 - WIDTH/2;
cImg.y = HEIGHT / -2;
cImg.w = w;
cImg.f = 2;
}
draw(ctx,cImg);
function update(cImg,mouse,mouse_last,touches,touches_last){
if (touches.length === 1){
// 单个手指
if (!cImg.f){
return false;
}
else if(cImg.f == 1){
var _y = cImg.y + (mouse.y - mouse_last.y);
if (_y >= 0){
cImg.y = 0;
}
else if (_y*-1 + HEIGHT > cImg.h){
cImg.y = HEIGHT - cImg.h;
}
else{
cImg.y = _y;
}
}
else{
var _x = cImg.x + (mouse.x - mouse_last.x);
if (_x >= 0){
cImg.x = 0;
}
else if (_x*-1 + WIDTH > cImg.w){
cImg.x = WIDTH - cImg.w;
}
else{
cImg.x = _x;
}
}
}
}
function draw(ctx,cImg){
ctx.clearRect(0, 0, WIDTH, HEIGHT);
ctx.save();
ctx.translate(WIDTH/2,HEIGHT/2);
ctx.rotate(cImg.r *Math.PI /180);
//console.log(cImg.r);
ctx.scale(cImg.c,cImg.c);
ctx.drawImage(img,cImg.x,cImg.y,cImg.w,cImg.h);
ctx.restore();
ctx.drawImage(outerImg,0,0,WIDTH,HEIGHT);
}
var isMove = false,
mouse_last = {
x : 0,
y : 0
},
touches = [];
var lastRotate = 0,
lastScale = 0,
lastPan = {x :0,y:0};
hammertime.on('rotatestart', function(ev) {
//console.log('rotatestart' ,ev);
lastRotate = ev.rotation;
lastPan = ev.center;
});
hammertime.on('rotatemove', function(ev) {
//console.log('rotatemove' ,ev);
var r = lastRotate - ev.rotation;
cImg.r -= r;
var radians = cImg.r * Math.PI / 180;
cImg.x = cImg.x + (ev.center.x - lastPan.x) * Math.cos(radians) + (ev.center.y - lastPan.y) * Math.sin(radians);
cImg.y = cImg.y + (ev.center.y - lastPan.y) * Math.cos(radians) - (ev.center.x - lastPan.x) * Math.sin(radians);
draw(ctx,cImg);
lastRotate = ev.rotation;
lastPan = ev.center;
});
hammertime.on( "rotateend", function( ev ) {
//console.log("rotateend" ,ev);
lastRotate = ev.rotation;
lastPan = ev.center;
});
hammertime.on('pinchstart', function(ev) {
//console.log('pinchstart' ,ev.scale);
lastScale = ev.scale;
});
hammertime.on('pinchmove', function(ev) {
//console.log('pinchmove' ,ev.scale);
cImg.c -= (lastScale-ev.scale);
lastScale = ev.scale;
});
hammertime.on( "pinchend", function( ev ) {
//console.log("pinchend" ,ev.scale);
lastScale = ev.scale;
});
hammertime.on("panstart", function( ev ) {
lastPan = ev.center;
});
hammertime.on("panend", function( ev ) {
lastPan = ev.center;
});
hammertime.on("panmove", function( ev ) {
var radians = cImg.r * Math.PI / 180;
cImg.x = cImg.x + (ev.center.x - lastPan.x) * Math.cos(radians) + (ev.center.y - lastPan.y) * Math.sin(radians);
cImg.y = cImg.y + (ev.center.y - lastPan.y) * Math.cos(radians) - (ev.center.x - lastPan.x) * Math.sin(radians);
draw(ctx,cImg);
lastPan = ev.center;
});
}
});
});
</script>
</html>