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bannerDistorted2.htm
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Distorted Image Generator</title>
<style>
html,body{margin:0;padding:0;background-color:white}
canvas{text-rendering:optimizeLegibility}
div{position:absolute;left:0;right:0;top:0;width:1900px}
input[type=text]{height:30px;width:40px;font-family:Arial;font-size:13px;margin:0;padding:0;box-sizing:border-box}
input[type=file]{height:30px;font-family:Arial;font-size:13px;line-height:30px;vertical-align:top;margin:0;padding:0;box-sizing:border-box}
.node{width:24px;height:24px;display:none;position:absolute;top:0;left:0;margin-top:20px;margin-left:-5px;border:1px solid red}
</style>
</head>
<body>
<div>
<input type="text" id="x1" placeholder="x1">
<input type="text" id="y1" placeholder="y1">
<input type="text" id="x2" placeholder="x2">
<input type="text" id="y2" placeholder="y2">
<input type="text" id="x3" placeholder="x3">
<input type="text" id="y3" placeholder="y3">
<input type="text" id="x4" placeholder="x4">
<input type="text" id="y4" placeholder="y4">
<input type="file" id="screenshot1">
<input type="file" id="screenshot2"><br />
<canvas width="500" height="500" id="canvasHandler"></canvas>
</div>
<script>
// BASED ON https://stackoverflow.com/questions/4097688/draw-distorted-image-on-html5s-canvas
var controls = [];
var canvas;
var context;
var triangles = [];
var mustExecuteMouseMove = false;
var mustExecuteMouseMoveTarget = null;
var finalImage1 = null;
var finalImage2 = null;
window.addEventListener("load", function()
{
// CLEARING ALL THE INPUTTED VALUES (IF ANY)
document.getElementById("screenshot1").value = null;
document.getElementById("screenshot2").value = null;
document.getElementById("x1").value = "100";
document.getElementById("y1").value = "75";
document.getElementById("x2").value = "200";
document.getElementById("y2").value = "50";
document.getElementById("x3").value = "175";
document.getElementById("y3").value = "175";
document.getElementById("x4").value = "75";
document.getElementById("y4").value = "200";
// SETTING WHAT WILL HAPPEN WHEN THE USER CLICKS ON THE DOCUMENT
document.body.addEventListener("mousedown", function(event)
{
// CHECKING IF THE USER IS CLICKING ON A NODE
if (event.target.className == "node")
{
// SETTING THAT THE MOUSE MOVE MUST BE EXECUTED
mustExecuteMouseMove = true;
// SETTING THE NODE TARGET THAT MUST BE USED
mustExecuteMouseMoveTarget = event.target;
}
else
{
// CLEARING THE VALUES
mustExecuteMouseMove = false;
mustExecuteMouseMoveTarget = null;
}
});
// SETTING WHAT WILL HAPPEN WHEN THE USER IS MOVING THE MOUSE
document.body.addEventListener("mousemove", function(event)
{
// CHECKING IF THE MOUSE MOVE MUST BE EXECUTED AND THAT THERE IS A TARGET
if (mustExecuteMouseMove==true && mustExecuteMouseMoveTarget!=null)
{
// GETTING THE X AND Y VALUE
var x = event.pageX - 7;
var y = event.pageY - 40;
// MOVING THE TARGET
mustExecuteMouseMoveTarget.style.left = x + "px";
mustExecuteMouseMoveTarget.style.top = y + "px";
document.getElementById("x" + mustExecuteMouseMoveTarget.indexValue).value = x;
document.getElementById("y" + mustExecuteMouseMoveTarget.indexValue).value = y;
}
});
// SETTING WHAT WILL HAPPEN WHEN THE USER IS STOPS PRESSING THE MOUSE BUTTON
document.body.addEventListener("mouseup", function(event)
{
// CLEARING THE VALUES
mustExecuteMouseMove = false;
mustExecuteMouseMoveTarget = null;
});
function update()
{
try
{
// CREATING THE FILEREADER
var filereader = new FileReader();
// GETTING THE EXTENSION
var extension = document.getElementById("screenshot1").files[0].name.split(".").pop().toLowerCase();
// CHECKING THE EXTENSION IN ORDER TO KNOW IF THE FILE IS AN IMAGE
if (extension=="jpg" | extension=="jpeg" | extension=="png")
{
// SETTING WHAT WILL HAPPEN WHEN THE FILE IS LOADED
filereader.onload = function()
{
// LOADING THE IMAGE FILE
var image1 = new Image;
image1.onload = function()
{
// UPDATING THE FINAL IMAGE 1 VALUE
finalImage1 = image1;
// RESIZING THE CANVAS
canvas.width = finalImage1.width;
canvas.height= finalImage1.height;
};
image1.src = filereader.result;
};
// READING/LOADING THE FILE
filereader.readAsDataURL(document.getElementById("screenshot1").files[0]);
}
}
catch(err)
{
}
try
{
// CREATING THE FILEREADER
var filereader2 = new FileReader();
// GETTING THE EXTENSION
var extension = document.getElementById("screenshot2").files[0].name.split(".").pop().toLowerCase();
// CHECKING THE EXTENSION IN ORDER TO KNOW IF THE FILE IS AN IMAGE
if (extension=="jpg" | extension=="jpeg" | extension=="png")
{
// SETTING WHAT WILL HAPPEN WHEN THE FILE IS LOADED
filereader2.onload = function()
{
// LOADING THE IMAGE FILE
var image2 = new Image;
image2.onload = function()
{
// UPDATING THE FINAL IMAGE 2 VALUE
finalImage2 = image2;
// SHOWING AND MOVING THE CONTROL 1
controls[0].style.display = "block";
controls[0].style.left = "100px";
controls[0].style.top = "75px";
document.getElementById("x1").value = "100";
document.getElementById("y1").value = "75";
// SHOWING AND MOVING THE CONTROL 2
controls[1].style.display = "block";
controls[1].style.left = "200px";
controls[1].style.top = "50px";
document.getElementById("x2").value = "200";
document.getElementById("y2").value = "50";
// SHOWING AND MOVING THE CONTROL 3
controls[2].style.display = "block";
controls[2].style.left = "175px";
controls[2].style.top = "175px";
document.getElementById("x3").value = "175";
document.getElementById("y3").value = "175";
// SHOWING AND MOVING THE CONTROL 4
controls[3].style.display = "block";
controls[3].style.left = "75px";
controls[3].style.top = "200px";
document.getElementById("x4").value = "75";
document.getElementById("y4").value = "200";
};
image2.src = filereader2.result;
};
// READING/LOADING THE FILE
filereader2.readAsDataURL(document.getElementById("screenshot2").files[0]);
}
}
catch(err)
{
}
}
function updateNodesLocation()
{
try
{
for (var i = 0; i<controls.length;i++)
{
controls[i].style.left = document.getElementById("x" + (i+1)).value + "px";
controls[i].style.top = document.getElementById("y" + (i+1)).value + "px";
}
}
catch(err)
{
}
}
function draw()
{
try
{
// CHECKING IF THE FIRST IMAGE WAS LOADED
if (finalImage1!=null)
{
// CLEARING THE IMAGE
context.clearRect(0,0,finalImage1.width, finalImage1.height);
}
// CHECKING IF THE SECOND IMAGE WAS LOADED
if (finalImage2!=null)
{
// CALCULATING THE IMAGE GEOMETRY
calculateGeometry();
// LOOPING EVERY TRIANGLE
for (triangle of triangles)
{
// DRAWING EVERY TRIANGLE
drawTriangle(context, finalImage2,
triangle.p0.x, triangle.p0.y,
triangle.p1.x, triangle.p1.y,
triangle.p2.x, triangle.p2.y,
triangle.t0.u, triangle.t0.v,
triangle.t1.u, triangle.t1.v,
triangle.t2.u, triangle.t2.v);
}
}
// CHECKING IF THE FIRST IMAGE WAS LOADED
if (finalImage1!=null)
{
// DRAWING THE FIRST IMAGE ONE MORE TIME
context.drawImage(finalImage1, 0, 0, finalImage1.width, finalImage1.height);
}
}
catch(err)
{
}
}
function calculateGeometry()
{
// CLEARING THE TRIANGLES
triangles = [];
// GENERATING THE SUBDIVISION
var subs = 7; // VERTICAL SUBDIVISIONS
var divs = 7; // HORIZONTAL SUBDIVISIONS
var p1 = new Point(parseInt(document.getElementById("x1").value) + 6, parseInt(document.getElementById("y1").value) + 6);
var p2 = new Point(parseInt(document.getElementById("x2").value) + 6, parseInt(document.getElementById("y2").value) + 6);
var p3 = new Point(parseInt(document.getElementById("x3").value) + 6, parseInt(document.getElementById("y3").value) + 6);
var p4 = new Point(parseInt(document.getElementById("x4").value) + 6, parseInt(document.getElementById("y4").value) + 6);
var dx1 = p4.x - p1.x;
var dy1 = p4.y - p1.y;
var dx2 = p3.x - p2.x;
var dy2 = p3.y - p2.y;
var imgW = finalImage2.naturalWidth;
var imgH = finalImage2.naturalHeight;
for (var sub = 0; sub < subs; ++sub)
{
var curRow = sub / subs;
var nextRow = (sub + 1) / subs;
var curRowX1 = p1.x + dx1 * curRow;
var curRowY1 = p1.y + dy1 * curRow;
var curRowX2 = p2.x + dx2 * curRow;
var curRowY2 = p2.y + dy2 * curRow;
var nextRowX1 = p1.x + dx1 * nextRow;
var nextRowY1 = p1.y + dy1 * nextRow;
var nextRowX2 = p2.x + dx2 * nextRow;
var nextRowY2 = p2.y + dy2 * nextRow;
for (var div = 0; div < divs; ++div)
{
var curCol = div / divs;
var nextCol = (div + 1) / divs;
var dCurX = curRowX2 - curRowX1;
var dCurY = curRowY2 - curRowY1;
var dNextX = nextRowX2 - nextRowX1;
var dNextY = nextRowY2 - nextRowY1;
var p1x = curRowX1 + dCurX * curCol;
var p1y = curRowY1 + dCurY * curCol;
var p2x = curRowX1 + (curRowX2 - curRowX1) * nextCol;
var p2y = curRowY1 + (curRowY2 - curRowY1) * nextCol;
var p3x = nextRowX1 + dNextX * nextCol;
var p3y = nextRowY1 + dNextY * nextCol;
var p4x = nextRowX1 + dNextX * curCol;
var p4y = nextRowY1 + dNextY * curCol;
var u1 = curCol * imgW;
var u2 = nextCol * imgW;
var v1 = curRow * imgH;
var v2 = nextRow * imgH;
var triangle1 = new Triangle(
new Point(p1x-1, p1y),
new Point(p3x+2, p3y+1),
new Point(p4x-1, p4y+1),
new TextCoord(u1, v1),
new TextCoord(u2, v2),
new TextCoord(u1, v2)
);
var triangle2 = new Triangle(
new Point(p1x-2, p1y),
new Point(p2x+1, p2y),
new Point(p3x+1, p3y+1),
new TextCoord(u1, v1),
new TextCoord(u2, v1),
new TextCoord(u2, v2)
);
triangles.push(triangle1);
triangles.push(triangle2);
}
}
}
// https://tulrich.com/geekstuff/canvas/jsgl.js
function drawTriangle(ctx, im, x0, y0, x1, y1, x2, y2, sx0, sy0, sx1, sy1, sx2, sy2)
{
ctx.save();
ctx.beginPath();
ctx.moveTo(x0, y0);
ctx.lineTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.closePath();
ctx.clip();
var denom = sx0 * (sy2 - sy1) - sx1 * sy2 + sx2 * sy1 + (sx1 - sx2) * sy0;
if (denom == 0)
{
return;
}
var m11 = -(sy0 * (x2 - x1) - sy1 * x2 + sy2 * x1 + (sy1 - sy2) * x0) / denom;
var m12 = (sy1 * y2 + sy0 * (y1 - y2) - sy2 * y1 + (sy2 - sy1) * y0) / denom;
var m21 = (sx0 * (x2 - x1) - sx1 * x2 + sx2 * x1 + (sx1 - sx2) * x0) / denom;
var m22 = -(sx1 * y2 + sx0 * (y1 - y2) - sx2 * y1 + (sx2 - sx1) * y0) / denom;
var dx = (sx0 * (sy2 * x1 - sy1 * x2) + sy0 * (sx1 * x2 - sx2 * x1) + (sx2 * sy1 - sx1 * sy2) * x0) / denom;
var dy = (sx0 * (sy2 * y1 - sy1 * y2) + sy0 * (sx1 * y2 - sx2 * y1) + (sx2 * sy1 - sx1 * sy2) * y0) / denom;
ctx.transform(m11, m12, m21, m22, dx, dy);
ctx.drawImage(im, 0, 0);
ctx.restore();
}
function TextCoord(u,v)
{
this.u = u?u:0;
this.v = v?v:0;
}
function Triangle(p0, p1, p2, t0, t1, t2)
{
this.p0 = p0;
this.p1 = p1;
this.p2 = p2;
this.t0 = t0;
this.t1 = t1;
this.t2 = t2;
}
function Point(x,y)
{
this.x = x ? x : 0;
this.y = y ? y : 0;
}
var p = Point.prototype;
p.length = function(point)
{
point = point ? point : new Point();
var xs =0, ys =0;
xs = point.x - this.x;
xs = xs * xs;
ys = point.y - this.y;
ys = ys * ys;
return Math.sqrt( xs + ys );
}
// SETTING AN INTERVAL TO DRAW THE IMAGE
setInterval(draw, 1000 / 24);
// GETTING THE CANVAS
canvas = document.getElementById("canvasHandler");
// GETTING THE CANVAS CONTEXT
context = canvas.getContext("2d");
// DRAWING THE NODES
for (var i = 0; i < 4; ++i)
{
// CREATING A NODE
var control = document.createElement("div");
// SETTING THE NODE CLASSNAME
control.className = "node";
// SETTING AN INDEX VALUE
control.indexValue = i + 1;
// ADDING THE NODE TO THE DOCUMENT
document.body.appendChild(control);
// ADDING THE NODE THE CONTROLS ARRAY
controls.push(control);
}
// SETTING WHAT WILL HAPPEN WHEN THE USER TYPES IN A INPUT BOX
document.getElementById("x1").addEventListener("input",function(e){updateNodesLocation()});
document.getElementById("y1").addEventListener("input",function(e){updateNodesLocation()});
document.getElementById("x2").addEventListener("input",function(e){updateNodesLocation()});
document.getElementById("y2").addEventListener("input",function(e){updateNodesLocation()});
document.getElementById("x3").addEventListener("input",function(e){updateNodesLocation()});
document.getElementById("y3").addEventListener("input",function(e){updateNodesLocation()});
document.getElementById("x4").addEventListener("input",function(e){updateNodesLocation()});
document.getElementById("y4").addEventListener("input",function(e){updateNodesLocation()});
// SETTING WHAT WILL HAPPEN WHEN THE USER SELECTS A FILE
document.getElementById("screenshot1").addEventListener("change",function(e){update()});
document.getElementById("screenshot2").addEventListener("change",function(e){update()});
});
</script>
</body>
</html>