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HTML5可放大图片裁切特效代码

时间：2013-08-18 04:44 来源：互联网作者：源码搜藏收藏推荐

<!DOCTYPE html>
<html lang="en" >
<head>
<title>HTML5图片裁切特效代码</title>
<style>
*{
    margin:0;
    padding:0;
}
body {
    background-color:#74b1d1;
    color:#fff;
    font:14px/1.3 Arial,sans-serif;
}
header {
    background-color:#212121;
    box-shadow: 0 -1px 2px #111111;
    display:block;
    height:70px;
    position:relative;
    width:100%;
    z-index:100;
}
header h2{
    font-size:22px;
    font-weight:normal;
    left:50%;
    margin-left:-400px;
    padding:22px 0;
    position:absolute;
    width:540px;
}
header a.stuts,a.stuts:visited{
    border:none;
    text-decoration:none;
    color:#fcfcfc;
    font-size:14px;
    left:50%;
    line-height:31px;
    margin:23px 0 0 110px;
    position:absolute;
    top:0;
}
header .stuts span {
    font-size:22px;
    font-weight:bold;
    margin-left:5px;
}
.container {
    overflow:hidden;
    width:989px;
    margin:20px auto;
}
.contr {
    background-color:#212121;
    padding:10px 0;
    text-align:center;

border-radius:10px 10px 0 0;
    -moz-border-radius:10px 10px 0 0;
    -webkit-border-radius:10px 10px 0 0;
}
.contr button {
    padding:5px 10px;
}
#panel {
    float:left;
    width:785px;
}
#results {
    float:right;
    text-align: center;
    width:195px;
}
#results img {
    background-color:#fff;
    display:block;
    height:200px;
    width:200px;
}
</style>
<script src="http://www.codefans.net/ajaxjs/jquery-1.6.2.min.js"></script>
<script>
var canvas, ctx;
var image;
var iMouseX, iMouseY = 1;
var theSelection;
function Selection(x, y, w, h){
    this.x = x; // initial positions
    this.y = y;
    this.w = w; // and size
    this.h = h;
    this.px = x; // extra variables to dragging calculations
    this.py = y;
    this.csize = 6; // resize cubes size
    this.csizeh = 10; // resize cubes size (on hover)
    this.bHow = [false, false, false, false]; // hover statuses
    this.iCSize = [this.csize, this.csize, this.csize, this.csize]; // resize cubes sizes
    this.bDrag = [false, false, false, false]; // drag statuses
    this.bDragAll = false; // drag whole selection
}
Selection.prototype.draw = function(){
    ctx.strokeStyle = '#000';
    ctx.lineWidth = 2;
    ctx.strokeRect(this.x, this.y, this.w, this.h);
    // draw part of original image
    if (this.w > 0 && this.h > 0) {
        ctx.drawImage(image, this.x, this.y, this.w, this.h, this.x, this.y, this.w, this.h);
    }
    // draw resize cubes
    ctx.fillStyle = '#fff';
    ctx.fillRect(this.x - this.iCSize[0], this.y - this.iCSize[0], this.iCSize[0] * 2, this.iCSize[0] * 2);
    ctx.fillRect(this.x + this.w - this.iCSize[1], this.y - this.iCSize[1], this.iCSize[1] * 2, this.iCSize[1] * 2);
    ctx.fillRect(this.x + this.w - this.iCSize[2], this.y + this.h - this.iCSize[2], this.iCSize[2] * 2, this.iCSize[2] * 2);
    ctx.fillRect(this.x - this.iCSize[3], this.y + this.h - this.iCSize[3], this.iCSize[3] * 2, this.iCSize[3] * 2);
}
function drawScene() { // main drawScene function
    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height); // clear canvas
    ctx.drawImage(image, 0, 0, ctx.canvas.width, ctx.canvas.height);
    ctx.fillStyle = 'rgba(0, 0, 0, 0.5)';
    ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
    theSelection.draw();
}
$(function(){
    image = new Image();
    image.onload = function () {
    }
    image.src = 'http://www.codefans.net/jscss/demoimg/image.jpg';
    canvas = document.getElementById('panel');
    ctx = canvas.getContext('2d');
    theSelection = new Selection(200, 200, 200, 200);
    $('#panel').mousemove(function(e) { // binding mouse move event
        var canvasOffset = $(canvas).offset();
        iMouseX = Math.floor(e.pageX - canvasOffset.left);
        iMouseY = Math.floor(e.pageY - canvasOffset.top);
        // in case of drag of whole selector
        if (theSelection.bDragAll) {
            theSelection.x = iMouseX - theSelection.px;
            theSelection.y = iMouseY - theSelection.py;
        }
        for (i = 0; i < 4; i++) {
            theSelection.bHow[i] = false;
            theSelection.iCSize[i] = theSelection.csize;
        }
        // hovering over resize cubes
        if (iMouseX > theSelection.x - theSelection.csizeh && iMouseX < theSelection.x + theSelection.csizeh &&
            iMouseY > theSelection.y - theSelection.csizeh && iMouseY < theSelection.y + theSelection.csizeh) {

theSelection.bHow[0] = true;
            theSelection.iCSize[0] = theSelection.csizeh;
        }
        if (iMouseX > theSelection.x + theSelection.w-theSelection.csizeh && iMouseX < theSelection.x + theSelection.w + theSelection.csizeh &&
            iMouseY > theSelection.y - theSelection.csizeh && iMouseY < theSelection.y + theSelection.csizeh) {
            theSelection.bHow[1] = true;
            theSelection.iCSize[1] = theSelection.csizeh;
        }
        if (iMouseX > theSelection.x + theSelection.w-theSelection.csizeh && iMouseX < theSelection.x + theSelection.w + theSelection.csizeh &&
            iMouseY > theSelection.y + theSelection.h-theSelection.csizeh && iMouseY < theSelection.y + theSelection.h + theSelection.csizeh) {
            theSelection.bHow[2] = true;
            theSelection.iCSize[2] = theSelection.csizeh;
        }
        if (iMouseX > theSelection.x - theSelection.csizeh && iMouseX < theSelection.x + theSelection.csizeh &&
            iMouseY > theSelection.y + theSelection.h-theSelection.csizeh && iMouseY < theSelection.y + theSelection.h + theSelection.csizeh) {
            theSelection.bHow[3] = true;
            theSelection.iCSize[3] = theSelection.csizeh;
        }
        // in case of dragging of resize cubes
        var iFW, iFH;
        if (theSelection.bDrag[0]) {
            var iFX = iMouseX - theSelection.px;
            var iFY = iMouseY - theSelection.py;
            iFW = theSelection.w + theSelection.x - iFX;
            iFH = theSelection.h + theSelection.y - iFY;
        }
        if (theSelection.bDrag[1]) {
            var iFX = theSelection.x;
            var iFY = iMouseY - theSelection.py;
            iFW = iMouseX - theSelection.px - iFX;
            iFH = theSelection.h + theSelection.y - iFY;
        }
        if (theSelection.bDrag[2]) {
            var iFX = theSelection.x;
            var iFY = theSelection.y;
            iFW = iMouseX - theSelection.px - iFX;
            iFH = iMouseY - theSelection.py - iFY;
        }
        if (theSelection.bDrag[3]) {
            var iFX = iMouseX - theSelection.px;
            var iFY = theSelection.y;
            iFW = theSelection.w + theSelection.x - iFX;
            iFH = iMouseY - theSelection.py - iFY;
        }
        if (iFW > theSelection.csizeh * 2 && iFH > theSelection.csizeh * 2) {
            theSelection.w = iFW;
            theSelection.h = iFH;
            theSelection.x = iFX;
            theSelection.y = iFY;
        }
        drawScene();
    });
    $('#panel').mousedown(function(e) { // binding mousedown event
        var canvasOffset = $(canvas).offset();
        iMouseX = Math.floor(e.pageX - canvasOffset.left);
        iMouseY = Math.floor(e.pageY - canvasOffset.top);
        theSelection.px = iMouseX - theSelection.x;
        theSelection.py = iMouseY - theSelection.y;
        if (theSelection.bHow[0]) {
            theSelection.px = iMouseX - theSelection.x;
            theSelection.py = iMouseY - theSelection.y;
        }
        if (theSelection.bHow[1]) {
            theSelection.px = iMouseX - theSelection.x - theSelection.w;
            theSelection.py = iMouseY - theSelection.y;
        }
        if (theSelection.bHow[2]) {
            theSelection.px = iMouseX - theSelection.x - theSelection.w;
            theSelection.py = iMouseY - theSelection.y - theSelection.h;
        }
        if (theSelection.bHow[3]) {
            theSelection.px = iMouseX - theSelection.x;
            theSelection.py = iMouseY - theSelection.y - theSelection.h;
        }
        if (iMouseX > theSelection.x + theSelection.csizeh && iMouseX < theSelection.x+theSelection.w - theSelection.csizeh &&
            iMouseY > theSelection.y + theSelection.csizeh && iMouseY < theSelection.y+theSelection.h - theSelection.csizeh) {
            theSelection.bDragAll = true;
        }
        for (i = 0; i < 4; i++) {
            if (theSelection.bHow[i]) {
                theSelection.bDrag[i] = true;
            }
        }
    });
    $('#panel').mouseup(function(e) { // binding mouseup event
        theSelection.bDragAll = false;

for (i = 0; i < 4; i++) {
            theSelection.bDrag[i] = false;
        }
        theSelection.px = 0;
        theSelection.py = 0;
    });
    drawScene();
});
function getResults() {
    var temp_ctx, temp_canvas;
    temp_canvas = document.createElement('canvas');
    temp_ctx = temp_canvas.getContext('2d');
    temp_canvas.width = theSelection.w;
    temp_canvas.height = theSelection.h;
    temp_ctx.drawImage(image, theSelection.x, theSelection.y, theSelection.w, theSelection.h, 0, 0, theSelection.w, theSelection.h);
    var vData = temp_canvas.toDataURL();
    $('#crop_result').attr('src', vData);
    $('#results h2').text('Well done, we have prepared our cropped image, now you can save it if you wish');
}
</script>
</head>
<body>
<header>
<h2>HTML5 图片裁切，可放大显示</h2>
</header>
        <div class="container">
            <div class="contr">
                <button onclick="getResults()">裁切</button>
            </div>
            <canvas id="panel" width="779" height="519"></canvas>
            <div id="results">
                <h2>Please make selection for cropping and click 'Crop' button.</h2>
                <img id="crop_result" />
            </div>
        </div>
    </body>
</html>

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