projects / dygraphs.git / blame
| Commit | Line | Data |
|---|---|---|
| 54425b14 | 1 | <!DOCTYPE html> |
| 6bef45dc DV |
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> |