-// Use this as a template for new Gallery entries.
+/*global Gallery,Dygraph,data */
+/*jshint evil:true */
+/*global fn */
Gallery.register(
'plotter',
{
" return [0.1 * x, 0.1 * x + Math.sin(x), 0.1*x + Math.cos(x)];",
"}</textarea><br/>",
"<b>Preset functions:</b> <select id='presets'>",
- "<option id='custom'>(custom)</option>",
+ "<option selected id='custom'>(custom)</option>",
"<option id='id'>Identity</option>",
"<option id='sine'>Sine Wave</option>",
"<option id='taylor'>Taylor series</option>",
- "<option selected id='sawtooth'>Sawtooth</option>",
+ "<option id='sawtooth'>Sawtooth</option>",
"</select>",
"</p>",
"",
- " <p><b>x range: </b> <input type='text' width='5' id='x1' value='-10' />",
- " to <input type='text' width='5' id='x2' value='10' /></p>",
- " <p><button id='plot'>Plot</button></p>",
+ "<p><b>x range: </b> <input type='text' width='5' id='x1' value='-10' />",
+ "to <input type='text' width='5' id='x2' value='10' /></p>",
+ "<p><button id='plot'>Plot</button></p>",
"",
- " <div id='graph_div' style='width:800px; height:400px;'></div>"].join("\n");
+ "<div id='graph_div' style='width:600px; height:300px;'></div>"].join("\n");
},
run: function() {
+ var plot; // defined below
var select = document.getElementById("presets");
+ var presets = {
+ 'id': [ -10, 10, 'function(x) {\n return x;\n}' ],
+ 'sine': [ -10, 10, 'function(x) {\n return Math.sin(x);\n}' ],
+ 'taylor': [ -3, 3, 'function(x) {\n return [Math.cos(x), 1 - x*x/2 + x*x*x*x/24];\n}' ],
+ '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}' ]
+ };
select.onchange = function() {
var sel = select.selectedIndex;
var id = select.options[sel].id;
- var presets = {
- 'id': [ -10, 10, 'function(x) {\n return x;\n}' ],
- 'sine': [ -10, 10, 'function(x) {\n return Math.sin(x);\n}' ],
- 'taylor': [ -3, 3, 'function(x) {\n return [Math.cos(x), 1 - x*x/2 + x*x*x*x/24];\n}' ],
- '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}' ]
- };
if (id == "custom") { return; }
document.getElementById("x1").value = presets[id][0];
document.getElementById("x2").value = presets[id][1];
document.getElementById("eq").value = presets[id][2];
plot();
- }
+ };
var plotButton = document.getElementById("plot");
- var plot = function() {
+ plot = function() {
var eq = document.getElementById("eq").value;
eval("fn = " + eq);
var graph = document.getElementById("graph_div");
- var width = parseInt(graph.style.width);
+ var width = parseInt(graph.style.width, 10);
var x1 = parseFloat(document.getElementById("x1").value);
var x2 = parseFloat(document.getElementById("x2").value);
var xs = 1.0 * (x2 - x1) / width;
data.push(row);
}
- g = new Dygraph(graph, data);
- }
- plot.onclick = plot;
+ new Dygraph(graph, data);
+ };
+ plotButton.onclick = plot;
plot();
}
});