Scan Lines

Developer
A S P
Size
3,012 Kb
Views
6,072
  1. Scan Lines Previews
  2. Scan Lines HTML Codes
  3. Scan Lines CSS Codes
  4. Scan Lines JS Codes

How do I make an scan lines?

Reproduce an image using horizontal lines built from CSS gradients.. What is a scan lines? How do you make a scan lines? This script and codes were developed by A S P on 15 January 2023, Sunday.

Scan Lines Previews
IQ Test

Scan Lines - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Scan Lines</title> <link rel="stylesheet" href="css/style.css">
</head>
<body>
<button id="run" onclick="run()">Run</button>
<input id="threshold" type="range" min="0" max="255"/>
<div id="thresholddisplay">--</div>
<h1>Source</h1>
<canvas id="source" height="200" width="200"></canvas>
<h1>Destination</h1>
<canvas id="destination" height="200" width="200"></canvas>
<div id="destinationdiv"></div> <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

Scan Lines - Script Codes CSS Codes

#source, #destination, #destinationdiv { border: 2px #000 solid; height: 200px; width: 200px;
}
#destination
{ display: none;
}
#run, #threshold { width: 200px; cursor: pointer;
}
#run
{ display: none;
}
#thresholddisplay
{ text-align: center; width: 200px;
}
.line
{ width: 200px; height: 1px;
}

Scan Lines - Script Codes JS Codes

var height = 200;
var width = 200;
var threshold = 10;
var isprocessing = false;
var tinput = $("#threshold");
tinput.on('change', function() { //console.log('changed'); if (!isprocessing) { isprocessing = true; threshold = tinput.val(); $("#thresholddisplay").html(threshold); run(); isprocessing = false; }
})
var imgsrc = 'http://annieperrier.com/code/images/baseball_128x128.png';
var scanvas = document.getElementById('source');
var sctx = scanvas.getContext('2d');
var dcanvas = document.getElementById('destination');
var dctx = dcanvas.getContext('2d');
// draw a white rect to cover area so transparent aren't black
sctx.fillStyle="#FFFFFF";
sctx.fillRect(0,0,width,height);
var divd = $("#destinationdiv");
var imageObj = new Image();
// This makes it work in codepen
imageObj.crossOrigin = "Anonymous";
imageObj.onload = function() {	sctx.drawImage(imageObj, 0, 0);	tinput.val(threshold).trigger('change');
};
imageObj.src = imgsrc;
function run()
{ var imgData = sctx.getImageData(0,0,width,height); //console.log(imgData); dctx.putImageData(imgData,0,0); divd.html(''); var r, g, b; var hex; var line, cur, prev, prevj; var i, j; for (i = 0; i < height; i++) { line = [], cur = [], prev = null; for (j = 0, k = 0; j < width; j++, k+=4) { r = imgData.data[(width * i + j) * 4]; g = imgData.data[(width * i + j) * 4+1]; b = imgData.data[(width * i + j) * 4+2]; //var a = imgData.data[(width * i + j) * 4+3]; cur = [r, g, b]; if (!prev || exceedthreshold(prev, cur)) { // add a pixel at the stop to prevent bleed if (j != 0 && prevj != j-1) { hex = rgbToHex(prev[0], prev[1], prev[2]); line.push([hex, j-1]); } hex = rgbToHex(r, g, b); //console.log(hex); line.push([hex, j]); prev = [r, g, b]; prevj = j; } k += 4; } addline(line); }
}
function addline(gradients)
{ // convert stops //#1e5799 0px,#2989d8 50px,#2989d8 150px,#7db9e8 200px var stops = ''; for (var i = 0; i < gradients.length; i++) { stops += gradients[i][0]+" "+gradients[i][1]+"px"; if (gradients.length-1 > i) stops += ", "; } var d = $("<div/>").addClass('line'); //console.log(stops); d.css('background', 'linear-gradient(to right, '+stops+')'); divd.append(d);
}
function exceedthreshold(prev, cur)
{ for (var i = 0; i < 3; i++) { if (Math.abs(prev[i] - cur[i]) > threshold) return true; } return false;
}
// http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
function rgbToHex(r, g, b)
{ return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
}
Scan Lines - Script Codes
Scan Lines - Script Codes
Home Page Home
Developer A S P
Username asp
Uploaded January 15, 2023
Rating 3
Size 3,012 Kb
Views 6,072
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