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imageMagickDemo.html
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imageMagickDemo.html
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<html>
<head>
<style> </style>
<script type="text/javascript">
var myCanvas;
var img;
var imgWidth, imgHeight;
var imgScale = 1.0;
var fileName="";
var points = [];
function setup()
{
document.getElementById('imageFile').addEventListener('change', handleImageSelect, false);
document.addEventListener('click', handleCanvasClick, false);
var holder = document.getElementById('canvas');
holder.ondragover = function () { this.className = 'hover'; return false; };
holder.ondragend = function () { this.className = ''; return false; };
holder.ondrop = function (e) {
this.className = '';
e.preventDefault();
var file = e.dataTransfer.files[0];
reader.onload = function (event) {
var reader = new FileReader();
alert("xx");
img = new Image();
img.onload = function() {
alert("xxx :)");
handleLoad(img);
};
img.src = event.target.result ;
};
reader.readAsDataURL(file);
return false;
};
}
function handleImageSelect(evt) {
var files = evt.target.files; // FileList object
/*
var file = files[0];
var reader = new FileReader();
reader.onload = function (event) {
alert("dd");
img = new Image();
img.onload = function() {
handleLoad(img);
};
img.src = event.target.result;
};
reader.readAsDataURL(file);
return;
*/
img = new Image();
img.onload = function(){
handleLoad(img);
}
fileName = files[0].fileName;
img.src = fileName; //files[0];
}
function handleCanvasClick(evt) {
var canvas = document.getElementById('canvas');
coords = canvas.relMouseCoords(event);
var context = canvas.getContext('2d');
context.beginPath();
var x = coords.x/imgScale;
var y = coords.y/imgScale;
if (x >= 0 && x < imgWidth && y >= 0 && y < imgHeight)
points.push([x, y]);
context.arc(x, y, 2, 0, Math.PI*2, true);
context.closePath();
context.fill();
if (points.length == 4)
{
s = "";
var mx = 0;
var my = 0;
var i = 0;
for (i = 0; i < points.length; i++)
{
p = points[i];
mx += p[0];
my += p[1];
}
mx /= points.length;
my /= points.length;
squareS = 150;
refs = [[mx-squareS, my -squareS], [mx+squareS, my -squareS], [mx+squareS, my +squareS], [mx-squareS, my+squareS]]
for (i = 0; i < points.length; i++)
{
p = points[i];
r = refs[i];
s += "" + p[0] +","+p[1] +"," + r[0] +","+r[1] + " ";
}
document.getElementById('outputText').value = "convert ..\\..\\web\\" + fileName + " -virtual-pixel transparent -distort Perspective \"" + s + "\" " + fileName + "out.png";
handleLoad(img);
points = [];
}
}
function handleLoad(img) {
var canvas = document.getElementById('canvas');
canvas.width = img.width;
canvas.height = img.height;
imgWidth = img.width;
imgHeight = img.height;
var context = canvas.getContext('2d');
context.drawImage(img, 0, 0, img.width, img.height);
}
function scaleImage(scale)
{
imgScale *= scale;
var canvas = document.getElementById('canvas');
canvas.style.width = "" + (imgWidth*imgScale) +"px";
canvas.style.height = "" + (imgHeight*imgScale) +"px";
//
//canvas.height = imgHeight;
}
function relMouseCoords(event){
var totalOffsetX = 0;
var totalOffsetY = 0;
var canvasX = 0;
var canvasY = 0;
var currentElement = this;
do{
totalOffsetX += currentElement.offsetLeft;
totalOffsetY += currentElement.offsetTop;
}
while(currentElement = currentElement.offsetParent)
canvasX = event.pageX - totalOffsetX;
canvasY = event.pageY - totalOffsetY;
return {x:canvasX, y:canvasY}
}
HTMLCanvasElement.prototype.relMouseCoords = relMouseCoords;
</script>
</head>
<body onload="setup()">
<form name="controls" action="">
<input type="button" value="Reset" onclick="handleReset();">
<input type="file" value="imageFile" id="imageFile" />
<input type="button" value="scale/1.2" onclick="scaleImage(1/1.2);"><input type="button" value="scale*1.2" onclick="scaleImage(1.2);">
<input type="text" name="outputText" id="outputText" />
</form>
<canvas id="canvas" width="400" height="300"></canvas>
</body>
</html>