java-visualizations/CustomColors.html at master · grahammitchell/java-visualizations · GitHub

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<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Custom Colors</title>
	<style type='text/css'>
		canvas {
			border: 1px solid black;
			margin-top: 20px;
			margin-left: 10px;
		}
		.snippet td, .snippet input {
			font: 24pt Consolas, Courier New, monospace;
			text-align: center;
		}
		.labels td, input.color {
			font: 12pt Calibri, Arial, sans-serif;
			text-align: center;
		}
		td.top {
			vertical-align: top;
		}
		td span.k { color: rgb(0,0,240); }
		.sliders input[type='range'] {
			width: 80px;

		}
	</style>
	<script type="text/javascript" src="jscolor/jscolor.js"></script>
</head>
<body>
	<p>Change the numbers or sliders and see what happens!</p>
	<table>
		<tr class=labels>
			<td>
			<td>red
			<td>
			<td>green
			<td>
			<td>blue
			<td>
			<td>(or click &darr;)
		</tr>
		<tr class=snippet>
			<td>g.setColor(<span class=k>new</span> Color(
			<td><input size=3 id='red' value='255'>
			<td>,
			<td><input size=3 id='green' value='255'>
			<td>,
			<td><input size=3 id='blue' value='0'>
			<td>));&nbsp;&nbsp;&nbsp;
			<td class="top">
			  <input id="colorpicker" tabindex="-1" value="ffff00" class="color {onImmediateChange:'fixRGB(this);'}">
		</tr>
		<tr class=sliders>
			<td>
			<td><input type="range" value="255"  id="redSlide"  min="0" max="255" step="1">
			<td>
			<td><input type="range" value="255"  id="greenSlide"  min="0" max="255" step="1">
			<td>
			<td><input type="range" value="255"  id="blueSlide"  min="0" max="255" step="1">
			<td>
		</tr>
	</table>
	<table>
		<tr class=snippet>
			<td>g.fillRect(150, 100, 150, 150);
		</tr>
	</table>
	<canvas id='canvas' width='800' height='500'></canvas>
	<script type='text/javascript'>
		"use strict";
		var ctx;
		var r, g, b, color;
		var slidingR = false;
		var slidingG = false;
		var slidingB = false;

		function update() {
			if ( slidingR ) {
				document.getElementById('red').value = document.getElementById('redSlide').value;
			}
			else {
				document.getElementById('redSlide').value = document.getElementById('red').value;
			}
			if ( slidingG ) {
				document.getElementById('green').value = document.getElementById('greenSlide').value;
			}
			else {
				document.getElementById('greenSlide').value = document.getElementById('green').value;
			}
			if ( slidingB ) {
				document.getElementById('blue').value = document.getElementById('blueSlide').value;
			}
			else {
				document.getElementById('blueSlide').value = document.getElementById('blue').value;
			}

			r  = retrieveColor('red');
			g  = retrieveColor('green');
			b  = retrieveColor('blue');
			color = "rgb(" + r + "," + g + "," + b + ")";
			document.getElementById('colorpicker').color.fromRGB(r/255, g/255, b/255);
		}

		function retrieveColor( id ) {
			var val = s2i( document.getElementById(id).value );
			if ( val < 0 ) {
				val = 0;
				document.getElementById(id).value = "0";
			}
			else if ( val > 255 ) {
				val = 255;
				document.getElementById(id).value = "255";
			}
			return val;
		}

		function fixRGB(color) {
			document.getElementById('red'  ).value = Math.round(255 * color.rgb[0]);
			document.getElementById('green').value = Math.round(255 * color.rgb[1]);
			document.getElementById('blue' ).value = Math.round(255 * color.rgb[2]);
		}

		function s2i( s ) {
			var n = 0;
			if ( s.length > 0 ) {
				var test = parseInt(s, 10);
				if ( ! isNaN(test) )
					n = test;
			}
			return n;
		}

		function draw(ctx) {
			ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);

			// draw arc
			ctx.fillStyle = color;
			ctx.fillRect(150,100,150,150);
		}

		function draggR() {	slidingR = true;	}
		function donedraggR() {
			slidingR = false;
			document.getElementById('red').value = document.getElementById('redSlide').value;
		}

		function draggG() {	slidingG = true;	}
		function donedraggG() {
			slidingG = false;
			document.getElementById('green').value = document.getElementById('greenSlide').value;
		}

		function draggB() {	slidingB = true;	}
		function donedraggB() {
			slidingB = false;
			document.getElementById('blue').value = document.getElementById('blueSlide').value;
		}


		function main() {
			ctx = document.getElementById('canvas').getContext("2d");
			document.getElementById('redSlide').addEventListener('input', draggR);
			document.getElementById('redSlide').addEventListener('change', donedraggR);
			document.getElementById('greenSlide').addEventListener('input', draggG);
			document.getElementById('greenSlide').addEventListener('change', donedraggG);
			document.getElementById('blueSlide').addEventListener('input', draggB);
			document.getElementById('blueSlide').addEventListener('change', donedraggB);
			setInterval(function() { update(); draw(ctx); }, 1000/60);
		}

		main();
	</script>
</body>
</html>