pass through (row, col) to valueFormatter
[dygraphs.git] / tests / plotter.html
CommitLineData
54425b14 1<!DOCTYPE html>
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2<html>
3 <head>
4 <title>dygraphs Equation Plotter</title>
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5 <!--
6 For production (minified) code, use:
7 <script type="text/javascript" src="dygraph-combined.js"></script>
8 -->
9 <script type="text/javascript" src="../dygraph-dev.js"></script>
10
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11 <script type="text/javascript">
12 function plot() {
13 var eq = document.getElementById("eq").value;
14 eval("fn = " + eq);
15
d16579a0 16 var graph = document.getElementById("graph_div");
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17 var width = parseInt(graph.style.width);
18 var x1 = parseFloat(document.getElementById("x1").value);
19 var x2 = parseFloat(document.getElementById("x2").value);
20 var xs = 1.0 * (x2 - x1) / width;
21
22 var data = [];
23 for (var i = 0; i < width; i++) {
24 var x = x1 + i * xs;
25 var y = fn(x);
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26 var row = [x];
27 if (y.length > 0) {
28 for (var j = 0; j < y.length; j++) {
29 row.push(y[j]);
30 }
31 } else {
32 row.push(y);
33 }
34 data.push(row);
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35 }
36
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37 var labels = ['X'];
38 if (data[0].length == 2) {
39 labels.push('Y');
40 } else {
6f8f19ef 41 for (var i = 1; i < data[0].length; i++) {
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42 labels.push('Y' + (1 + i));
43 }
44 }
45
46 g = new Dygraph(graph, data, {
47 labels: labels
48 });
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49 }
50
51 function preset() {
52 var sel = document.getElementById("presets").selectedIndex;
53 var id = document.getElementById("presets").options[sel].id;
54 var presets = {
55 'id': [ -10, 10, 'function(x) {\n return x;\n}' ],
56 'sine': [ -10, 10, 'function(x) {\n return Math.sin(x);\n}' ],
57 'taylor': [ -3, 3, 'function(x) {\n return [Math.cos(x), 1 - x*x/2 + x*x*x*x/24];\n}' ],
58 'sawtooth': [-10, 10, 'function(x) {\n var y = 0;\n for (var i = 1; i < 20; i+=2) {\n y += Math.sin(i * x)/i;\n }\n var final = 1 - 2*(Math.abs(Math.floor(x / Math.PI)) % 2);\n return [4/Math.PI * y, final];\n}' ]
59 };
60
61 if (id == "custom") { return; }
62 document.getElementById("x1").value = presets[id][0];
63 document.getElementById("x2").value = presets[id][1];
64 document.getElementById("eq").value = presets[id][2];
65 plot();
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66 }
67 </script>
68 </head>
e82114b2 69 <body onload="preset()">
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70 <p><b>Equation: </b><br/>
71 <textarea cols="40" rows="10" id="eq">function(x) {
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72 return [0.1 * x, 0.1 * x + Math.sin(x), 0.1*x + Math.cos(x)];
73}</textarea><br/>
74<b>Preset functions:</b> <select id=presets onchange="preset()">
75<option id=custom>(custom)</option>
76<option id=id>Identity</option>
77<option id=sine>Sine Wave</option>
78<option id=taylor>Taylor series</option>
79<option selected id=sawtooth>Sawtooth</option>
80</select>
6bef45dc 81 </p>
e82114b2 82
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83 <p><b>x range: </b> <input type=text width="5" id="x1" value="-10" />
84 to <input type=text width="5" id="x2" value="10" /></p>
85 <p><input type=button value="Plot" onClick="plot()" /></p>
86
d16579a0 87 <div id="graph_div" style="width:1024px; height:400px;"></div>
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88 </body>
89</html>