-// Use this as a template for new Gallery entries.
+/*global Gallery,Dygraph,data */
Gallery.register(
'linear-regression',
{
name: 'Linear Regressions',
title: 'Linear Regression Demo',
setup: function(parent) {
- parent.innerHTML =
- "<p>Click the buttons to generate linear regressions over either data "+
- "series. If you zoom in and then click the regression button, the regression "+
- "will only be run over visible points. Zoom back out to see what the local "+
- "regression looks like over the full data.</p> "+
- "<div id='demodiv' style='width: 480px; height: 320px;'></div>" +
- "<div style='text-align:center; width: 480px'>" +
- "<button style='color: green;' id='ry1'>Regression (Y1)</button> " +
- "<button style='color: blue;' id='ry2'>Regression (Y2)</button> " +
- "<button id='clear'>Clear Lines</button>" +
- "</div>";
+ parent.innerHTML = [
+ "<p>Click the buttons to generate linear regressions over either data ",
+ "series. If you zoom in and then click the regression button, the regression ",
+ "will only be run over visible points. Zoom back out to see what the local ",
+ "regression looks like over the full data.</p> ",
+ "<div id='demodiv' style='width: 480px; height: 320px;'></div>",
+ "<div style='text-align:center; width: 480px'>",
+ "<button style='color: green;' id='ry1'>Regression (Y1)</button> ",
+ "<button style='color: blue;' id='ry2'>Regression (Y2)</button> ",
+ "<button id='clear'>Clear Lines</button>",
+ "</div>"].join("\n");
},
run: function() {
- document.getElementById("ry1").onclick = function() { regression(1) };
- document.getElementById("ry2").onclick = function() { regression(2) };
- document.getElementById("clear").onclick = function() { clearLines() };
+ var g, regression, clearLines; // defined below
+ document.getElementById("ry1").onclick = function() { regression(1); };
+ document.getElementById("ry2").onclick = function() { regression(2); };
+ document.getElementById("clear").onclick = function() { clearLines(); };
var data = [];
for (var i = 0; i < 120; i++) {
30.0 - i / 5.0 - 10.0 * Math.sin(i / 3.0 + 1.0)]);
}
- g = new Dygraph(
- document.getElementById("demodiv"),
- data,
- {
- labels: ['X', 'Y1', 'Y2'],
- underlayCallback: drawLines,
- drawPoints: true,
- strokeWidth: 0.0
- }
- );
-
// coefficients of regression for each series.
// if coeffs = [ null, [1, 2], null ] then we draw a regression for series 1
// only. The regression line is y = 1 + 2 * x.
var coeffs = [ null, null, null ];
- function regression(series) {
+ regression = function(series) {
// Only run the regression over visible points.
var range = g.xAxisRange();
if (x < range[0] || x > range[1]) continue;
var y = g.getValue(i, series);
- if (y == null) continue;
+ if (y === null || y === undefined) continue;
if (y.length == 2) {
// using fractions
y = y[0] / y[1];
}
g.updateOptions({}); // forces a redraw.
- }
+ };
- function clearLines() {
+ clearLines = function() {
for (var i = 0; i < coeffs.length; i++) coeffs[i] = null;
g.updateOptions({});
- }
+ };
function drawLines(ctx, area, layout) {
if (typeof(g) == 'undefined') return; // won't be set on the initial draw.
var p1 = g.toDomCoords(x1, y1);
var p2 = g.toDomCoords(x2, y2);
- var c = new RGBColor(g.getColors()[i - 1]);
+ var c = Dygraph.toRGB_(g.getColors()[i - 1]);
c.r = Math.floor(255 - 0.5 * (255 - c.r));
c.g = Math.floor(255 - 0.5 * (255 - c.g));
c.b = Math.floor(255 - 0.5 * (255 - c.b));
- var color = c.toHex();
+ var color = 'rgb(' + c.r + ',' + c.g + ',' + c.b + ')';
ctx.save();
ctx.strokeStyle = color;
ctx.lineWidth = 1.0;
ctx.restore();
}
}
+
+ g = new Dygraph(
+ document.getElementById("demodiv"),
+ data,
+ {
+ labels: ['X', 'Y1', 'Y2'],
+ underlayCallback: drawLines,
+ drawPoints: true,
+ drawAxesAtZero: true,
+ strokeWidth: 0.0
+ }
+ );
}
});