| | 1 | <html> |
| | 2 | <head> |
| | 3 | <title>dygraphs Equation Plotter</title> |
| | 4 | <!--[if IE]> |
| | 5 | <script type="text/javascript" src="../excanvas.js"></script> |
| | 6 | <![endif]--> |
| | 7 | <script type="text/javascript" src="../strftime/strftime-min.js"></script> |
| | 8 | <script type="text/javascript" src="../rgbcolor/rgbcolor.js"></script> |
| | 9 | <script type="text/javascript" src="../dygraph-canvas.js"></script> |
| | 10 | <script type="text/javascript" src="../dygraph.js"></script> |
| | 11 | <script type="text/javascript"> |
| | 12 | function plot() { |
| | 13 | var eq = document.getElementById("eq").value; |
| | 14 | eval("fn = " + eq); |
| | 15 | |
| | 16 | var graph = document.getElementById("graph_div"); |
| | 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); |
| | 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); |
| | 35 | } |
| | 36 | |
| | 37 | g = new Dygraph(graph, data); |
| | 38 | } |
| | 39 | |
| | 40 | function preset() { |
| | 41 | var sel = document.getElementById("presets").selectedIndex; |
| | 42 | var id = document.getElementById("presets").options[sel].id; |
| | 43 | var presets = { |
| | 44 | 'id': [ -10, 10, 'function(x) {\n return x;\n}' ], |
| | 45 | 'sine': [ -10, 10, 'function(x) {\n return Math.sin(x);\n}' ], |
| | 46 | 'taylor': [ -3, 3, 'function(x) {\n return [Math.cos(x), 1 - x*x/2 + x*x*x*x/24];\n}' ], |
| | 47 | '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}' ] |
| | 48 | }; |
| | 49 | |
| | 50 | if (id == "custom") { return; } |
| | 51 | document.getElementById("x1").value = presets[id][0]; |
| | 52 | document.getElementById("x2").value = presets[id][1]; |
| | 53 | document.getElementById("eq").value = presets[id][2]; |
| | 54 | plot(); |
| | 55 | } |
| | 56 | </script> |
| | 57 | </head> |
| | 58 | <body onload="preset()"> |
| | 59 | <p><b>Equation: </b><br/> |
| | 60 | <textarea cols="40" rows="10" id="eq">function(x) { |
| | 61 | return [0.1 * x, 0.1 * x + Math.sin(x), 0.1*x + Math.cos(x)]; |
| | 62 | }</textarea><br/> |
| | 63 | <b>Preset functions:</b> <select id=presets onchange="preset()"> |
| | 64 | <option id=custom>(custom)</option> |
| | 65 | <option id=id>Identity</option> |
| | 66 | <option id=sine>Sine Wave</option> |
| | 67 | <option id=taylor>Taylor series</option> |
| | 68 | <option selected id=sawtooth>Sawtooth</option> |
| | 69 | </select> |
| | 70 | </p> |
| | 71 | |
| | 72 | <p><b>x range: </b> <input type=text width="5" id="x1" value="-10" /> |
| | 73 | to <input type=text width="5" id="x2" value="10" /></p> |
| | 74 | <p><input type=button value="Plot" onClick="plot()" /></p> |
| | 75 | |
| | 76 | <div id="graph_div" style="width:1024px; height:400px;"></div> |
| | 77 | </body> |
| | 78 | </html> |
projects / dygraphs.git / blame_incremental