projects / dygraphs.git / blame
| Commit | Line | Data |
|---|---|---|
| 54425b14 | 1 | <!DOCTYPE html> |
| 6bef45dc DV |
2 | <html> |
| 3 | <head> | |
| 10494b48 | 4 | <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7; IE=EmulateIE9"> |
| 6bef45dc DV |
5 | <title>dygraphs Equation Plotter</title> |
| 6 | <!--[if IE]> | |
| a2b2c3a1 | 7 | <script type="text/javascript" src="../excanvas.js"></script> |
| 6bef45dc | 8 | <![endif]--> |
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9 | <script type="text/javascript" src="../strftime/strftime-min.js"></script> |
| 10 | <script type="text/javascript" src="../rgbcolor/rgbcolor.js"></script> | |
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11 | <script type="text/javascript" src="../dygraph-canvas.js"></script> |
| 12 | <script type="text/javascript" src="../dygraph.js"></script> | |
| 13 | <script type="text/javascript"> | |
| 14 | function plot() { | |
| 15 | var eq = document.getElementById("eq").value; | |
| 16 | eval("fn = " + eq); | |
| 17 | ||
| d16579a0 | 18 | var graph = document.getElementById("graph_div"); |
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19 | var width = parseInt(graph.style.width); |
| 20 | var x1 = parseFloat(document.getElementById("x1").value); | |
| 21 | var x2 = parseFloat(document.getElementById("x2").value); | |
| 22 | var xs = 1.0 * (x2 - x1) / width; | |
| 23 | ||
| 24 | var data = []; | |
| 25 | for (var i = 0; i < width; i++) { | |
| 26 | var x = x1 + i * xs; | |
| 27 | var y = fn(x); | |
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28 | var row = [x]; |
| 29 | if (y.length > 0) { | |
| 30 | for (var j = 0; j < y.length; j++) { | |
| 31 | row.push(y[j]); | |
| 32 | } | |
| 33 | } else { | |
| 34 | row.push(y); | |
| 35 | } | |
| 36 | data.push(row); | |
| 6bef45dc DV |
37 | } |
| 38 | ||
| e82114b2 DV |
39 | g = new Dygraph(graph, data); |
| 40 | } | |
| 41 | ||
| 42 | function preset() { | |
| 43 | var sel = document.getElementById("presets").selectedIndex; | |
| 44 | var id = document.getElementById("presets").options[sel].id; | |
| 45 | var presets = { | |
| 46 | 'id': [ -10, 10, 'function(x) {\n return x;\n}' ], | |
| 47 | 'sine': [ -10, 10, 'function(x) {\n return Math.sin(x);\n}' ], | |
| 48 | 'taylor': [ -3, 3, 'function(x) {\n return [Math.cos(x), 1 - x*x/2 + x*x*x*x/24];\n}' ], | |
| 49 | '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}' ] | |
| 50 | }; | |
| 51 | ||
| 52 | if (id == "custom") { return; } | |
| 53 | document.getElementById("x1").value = presets[id][0]; | |
| 54 | document.getElementById("x2").value = presets[id][1]; | |
| 55 | document.getElementById("eq").value = presets[id][2]; | |
| 56 | plot(); | |
| 6bef45dc DV |
57 | } |
| 58 | </script> | |
| 59 | </head> | |
| e82114b2 | 60 | <body onload="preset()"> |
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61 | <p><b>Equation: </b><br/> |
| 62 | <textarea cols="40" rows="10" id="eq">function(x) { | |
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63 | return [0.1 * x, 0.1 * x + Math.sin(x), 0.1*x + Math.cos(x)]; |
| 64 | }</textarea><br/> | |
| 65 | <b>Preset functions:</b> <select id=presets onchange="preset()"> | |
| 66 | <option id=custom>(custom)</option> | |
| 67 | <option id=id>Identity</option> | |
| 68 | <option id=sine>Sine Wave</option> | |
| 69 | <option id=taylor>Taylor series</option> | |
| 70 | <option selected id=sawtooth>Sawtooth</option> | |
| 71 | </select> | |
| 6bef45dc | 72 | </p> |
| e82114b2 | 73 | |
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74 | <p><b>x range: </b> <input type=text width="5" id="x1" value="-10" /> |
| 75 | to <input type=text width="5" id="x2" value="10" /></p> | |
| 76 | <p><input type=button value="Plot" onClick="plot()" /></p> | |
| 77 | ||
| d16579a0 | 78 | <div id="graph_div" style="width:1024px; height:400px;"></div> |
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79 | </body> |
| 80 | </html> |