| 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="../dygraph-combined.js"></script> |
| 8 | <script type="text/javascript" src="../dygraph-canvas.js"></script> |
| 9 | <script type="text/javascript" src="../dygraph.js"></script> |
| 10 | <script type="text/javascript"> |
| 11 | function plot() { |
| 12 | var eq = document.getElementById("eq").value; |
| 13 | eval("fn = " + eq); |
| 14 | |
| 15 | var graph = document.getElementById("graph"); |
| 16 | var width = parseInt(graph.style.width); |
| 17 | var x1 = parseFloat(document.getElementById("x1").value); |
| 18 | var x2 = parseFloat(document.getElementById("x2").value); |
| 19 | var xs = 1.0 * (x2 - x1) / width; |
| 20 | |
| 21 | var data = []; |
| 22 | for (var i = 0; i < width; i++) { |
| 23 | var x = x1 + i * xs; |
| 24 | var y = fn(x); |
| 25 | data.push([x, y]); |
| 26 | } |
| 27 | |
| 28 | g = new Dygraph(graph, data, { labels: ["x", "y"] }); |
| 29 | } |
| 30 | </script> |
| 31 | </head> |
| 32 | <body> |
| 33 | <p><b>Equation: </b><br/> |
| 34 | <textarea cols="40" rows="10" id="eq">function(x) { |
| 35 | return Math.sin(x); |
| 36 | }</textarea> |
| 37 | </p> |
| 38 | <p><b>x range: </b> <input type=text width="5" id="x1" value="-10" /> |
| 39 | to <input type=text width="5" id="x2" value="10" /></p> |
| 40 | <p><input type=button value="Plot" onClick="plot()" /></p> |
| 41 | |
| 42 | <div id=graph style="width:1024px; height:400px;"></div> |
| 43 | </body> |
| 44 | </html> |