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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Halftone</title>
<!-- Bootstrap -->
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">
<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">
<link href="//maxcdn.bootstrapcdn.com/bootswatch/3.2.0/darkly/bootstrap.min.css" rel="stylesheet">
<link href="style.css" rel="stylesheet">
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
function update() {
console.log("update");
canvas.width = image.width;
canvas.height = image.height;
ctx.drawImage(image, 0, 0);
//console.log(ctx.getImageData(0, 0, canvas.width, canvas.height));
var rows = rowInput.value;
var cols = colInput.value;
var minSize = minInput.value;
var maxSize = maxInput.value;
var spacing = spacingInput.value;
var row;
var col;
var scale;
var imageAspect = canvas.width/canvas.height;
var waAspect = cols/rows;
if(waAspect<imageAspect){
scale = rows/image.height;
}else{
scale = cols/image.width;
}
var waCanvas = downScaleCanvas(canvas,scale);
var waData = waCanvas.getContext('2d').getImageData(0,0,cols,rows);
canvas.width = cols * spacing;
canvas.height = rows * spacing;
var val;
var minVal = 9999999;
var maxVal = 0;
var vals = new Array();
for (row = 0; row < rows; row++) {
for (col = 0; col < cols; col++) {
val = waData.data[(row*cols+col)*4]+waData.data[(row*cols+col)*4+1]+waData.data[(row*cols+col)*4+2];
vals.push(val);
minVal = Math.min(minVal,val);
maxVal = Math.max(maxVal,val);
}
}
var currentDR = (maxVal - minVal)/765;
var wantedDR = (maxSize - minSize)/spacing;
var multiplier = wantedDR/currentDR;
var brightness = minSize-(minVal/765) *spacing*multiplier;
var x;
var y;
var radius;
//console.log(minVal,maxVal,multiplier);
minVal = 9999999;
maxVal = 0;
gcodeOutput.html('\
(Generated by html5 cnc halftonepattern generator)\n\
(XYZ in millimeters, absolute)\n\
G21 G90 G64 G40\n\
G0 Z3.0\n\
G17\n\
M3 S255\n\
');
for (row = 0; row < rows; row++) {
ctx.fillStyle = '#FFFFFF';
for (col = 0; col < cols; col++) {
scale = (vals[row*cols+col]/765) *spacing*multiplier+brightness;
x = col * spacing + spacing / 2;
y = row * spacing + spacing / 2;
radius = scale/2;
ctx.beginPath();
ctx.arc(x,y,radius , 0, 2 * Math.PI);
ctx.fill();
//gcodeOutput.append('G0 X'+x+' Y'+y+'\n');
gcodeOutput.append('G1 X'+x+' Y'+(y-radius-minSize).toFixed(2)+'\n');
gcodeOutput.append('G2 X'+x+' Y'+(y-radius-minSize).toFixed(2)+' I'+x+' J'+y+'\n');
}
}
gcodeOutput.append('\
M5');
}
function downScaleCanvas(cv, scale) { //http://stackoverflow.com/questions/18922880/html5-canvas-resize-downscale-image-high-quality
if (!(scale < 1) || !(scale > 0))
throw ('scale must be a positive number <1 ');
var sqScale = scale * scale; // square scale = area of source pixel within target
var sw = cv.width; // source image width
var sh = cv.height; // source image height
var tw = Math.ceil(sw * scale); // target image width
var th = Math.ceil(sh * scale); // target image height
var sx = 0, sy = 0, sIndex = 0; // source x,y, index within source array
var tx = 0, ty = 0, yIndex = 0, tIndex = 0; // target x,y, x,y index within target array
var tX = 0, tY = 0; // rounded tx, ty
var w = 0, nw = 0, wx = 0, nwx = 0, wy = 0, nwy = 0; // weight / next weight x / y
// weight is weight of current source point within target.
// next weight is weight of current source point within next target's point.
var crossX = false; // does scaled px cross its current px right border ?
var crossY = false; // does scaled px cross its current px bottom border ?
var sBuffer = cv.getContext('2d').
getImageData(0, 0, sw, sh).data; // source buffer 8 bit rgba
var tBuffer = new Float32Array(3 * sw * sh); // target buffer Float32 rgb
var sR = 0, sG = 0, sB = 0; // source's current point r,g,b
/* untested !
var sA = 0; //source alpha */
for (sy = 0; sy < sh; sy++) {
ty = sy * scale; // y src position within target
tY = 0 | ty; // rounded : target pixel's y
yIndex = 3 * tY * tw; // line index within target array
crossY = (tY != (0 | ty + scale));
if (crossY) { // if pixel is crossing botton target pixel
wy = (tY + 1 - ty); // weight of point within target pixel
nwy = (ty + scale - tY - 1); // ... within y+1 target pixel
}
for (sx = 0; sx < sw; sx++, sIndex += 4) {
tx = sx * scale; // x src position within target
tX = 0 | tx; // rounded : target pixel's x
tIndex = yIndex + tX * 3; // target pixel index within target array
crossX = (tX != (0 | tx + scale));
if (crossX) { // if pixel is crossing target pixel's right
wx = (tX + 1 - tx); // weight of point within target pixel
nwx = (tx + scale - tX - 1); // ... within x+1 target pixel
}
sR = sBuffer[sIndex ]; // retrieving r,g,b for curr src px.
sG = sBuffer[sIndex + 1];
sB = sBuffer[sIndex + 2];
/* !! untested : handling alpha !!
sA = sBuffer[sIndex + 3];
if (!sA) continue;
if (sA != 0xFF) {
sR = (sR * sA) >> 8; // or use /256 instead ??
sG = (sG * sA) >> 8;
sB = (sB * sA) >> 8;
}
*/
if (!crossX && !crossY) { // pixel does not cross
// just add components weighted by squared scale.
tBuffer[tIndex ] += sR * sqScale;
tBuffer[tIndex + 1] += sG * sqScale;
tBuffer[tIndex + 2] += sB * sqScale;
} else if (crossX && !crossY) { // cross on X only
w = wx * scale;
// add weighted component for current px
tBuffer[tIndex ] += sR * w;
tBuffer[tIndex + 1] += sG * w;
tBuffer[tIndex + 2] += sB * w;
// add weighted component for next (tX+1) px
nw = nwx * scale
tBuffer[tIndex + 3] += sR * nw;
tBuffer[tIndex + 4] += sG * nw;
tBuffer[tIndex + 5] += sB * nw;
} else if (crossY && !crossX) { // cross on Y only
w = wy * scale;
// add weighted component for current px
tBuffer[tIndex ] += sR * w;
tBuffer[tIndex + 1] += sG * w;
tBuffer[tIndex + 2] += sB * w;
// add weighted component for next (tY+1) px
nw = nwy * scale
tBuffer[tIndex + 3 * tw ] += sR * nw;
tBuffer[tIndex + 3 * tw + 1] += sG * nw;
tBuffer[tIndex + 3 * tw + 2] += sB * nw;
} else { // crosses both x and y : four target points involved
// add weighted component for current px
w = wx * wy;
tBuffer[tIndex ] += sR * w;
tBuffer[tIndex + 1] += sG * w;
tBuffer[tIndex + 2] += sB * w;
// for tX + 1; tY px
nw = nwx * wy;
tBuffer[tIndex + 3] += sR * nw;
tBuffer[tIndex + 4] += sG * nw;
tBuffer[tIndex + 5] += sB * nw;
// for tX ; tY + 1 px
nw = wx * nwy;
tBuffer[tIndex + 3 * tw ] += sR * nw;
tBuffer[tIndex + 3 * tw + 1] += sG * nw;
tBuffer[tIndex + 3 * tw + 2] += sB * nw;
// for tX + 1 ; tY +1 px
nw = nwx * nwy;
tBuffer[tIndex + 3 * tw + 3] += sR * nw;
tBuffer[tIndex + 3 * tw + 4] += sG * nw;
tBuffer[tIndex + 3 * tw + 5] += sB * nw;
}
} // end for sx
} // end for sy
// create result canvas
var resCV = document.createElement('canvas');
resCV.width = tw;
resCV.height = th;
var resCtx = resCV.getContext('2d');
var imgRes = resCtx.getImageData(0, 0, tw, th);
var tByteBuffer = imgRes.data;
// convert float32 array into a UInt8Clamped Array
var pxIndex = 0; //
var val;
for (sIndex = 0, tIndex = 0; pxIndex < tw * th; sIndex += 3, tIndex += 4, pxIndex++) {
tByteBuffer[tIndex] = Math.ceil(tBuffer[sIndex]);
tByteBuffer[tIndex + 1] = Math.ceil(tBuffer[sIndex + 1]);
tByteBuffer[tIndex + 2] = Math.ceil(tBuffer[sIndex + 2]);
tByteBuffer[tIndex + 3] = 255;
}
// writing result to canvas.
resCtx.putImageData(imgRes, 0, 0);
return resCV;
}
var reader = new FileReader();
var image = new Image();
var canvas = $("#canvas").get(0);
var rowInput = $("#waRows").get(0);
var colInput = $("#waColumns").get(0);
var spacingInput = $("#waSpacing").get(0);
var minInput = $("#waMin").get(0);
var maxInput = $("#waMax").get(0);
var gcodeOutput = $("#gcode");
var ctx = canvas.getContext("2d");
reader.onload = function(e) {
console.log(e.target.result);
image.src=e.target.result;
}
$('#fileInput').bind('change', function(e) {
reader.readAsDataURL(this.files[0]);
})
$("#waRows").bind('change', update);
$("#waColumns").bind('change', update);
$("#waSpacing").bind('change', update);
$("#waMin").bind('change', update);
$("#waMax").bind('change', update);
$(image).bind('load',update);
image.src = "dorks.jpg";
});
</script>
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<h1 class="col-xs-12">Halftone pattern</h1>
<div class="col-xs-2">
<!-- <img id="filePreview" src="dorks.jpg" class="img-responsive col-xs-12"/>-->
<h2>Settings</h2>
<form class="form" role="form">
<!-- <div class="form-group">
<label class="" for="waWidth">Width</label>
<input type="number" class="form-control" id="waWidth" value="800">
</div>
<div class="form-group">
<label class="" for="waHeight">Height</label>
<input type="number" class="form-control" id="waHeight" value="400">
</div>-->
<span class="btn btn-default btn-file">
Select image <input type="file" id="fileInput">
</span>
<div class="form-group">
<label class="" for="waRows">Rows</label>
<input type="number" class="form-control" id="waRows" value="30">
</div>
<div class="form-group">
<label class="" for="waColumns">Columns</label>
<input type="number" class="form-control" id="waColumns" value="50">
</div>
<div class="form-group">
<label class="" for="waSpacing">Spacing</label>
<input type="number" class="form-control" id="waSpacing" value="20">
</div>
<div class="form-group">
<label class="" for="waMin">Smallest</label>
<input type="number" class="form-control" id="waMin" value="4">
</div>
<div class="form-group">
<label class="" for="waMax">Biggest</label>
<input type="number" class="form-control" id="waMax" value="16">
</div>
</form>
</div>
<div class="col-xs-6">
<h2>Preview</h2>
<canvas id="canvas" class="img-responsive">
</canvas>
</div>
<div class="col-xs-4">
<h2>Gcode</h2>
<textarea id="gcode" class="col-xs-12" cols="20" ></textarea>
</div>
<footer class="col-xs-12">
<small>Lucas Granberg 2014</small>
</footer>
</body>
</html>