// y pixel 100 = y1 line (green)
// y pixels 0-99 = nothing (white)
- // TODO(danvk): factor this and getPixel() into a utility usable by all tests.
- var ctx = g.hidden_ctx_;
- var imageData = ctx.getImageData(0, 0, 400, 300);
-
- assertEquals(400, imageData.width);
- assertEquals(300, imageData.height);
-
- // returns an (r, g, b, alpha) tuple for the pixel.
- // values are in [0, 255].
- var getPixel = function(imageData, x, y) {
- var i = 4 * (x + imageData.width * y);
- var d = imageData.data;
- return [d[i], d[i+1], d[i+2], d[i+3]];
- };
-
// 38 = round(0.15 * 255)
- assertEquals([0, 0, 255, 38], getPixel(imageData, 200, 250));
- assertEquals([0, 255, 0, 38], getPixel(imageData, 200, 150));
+ assertEquals([0, 0, 255, 38], Util.samplePixel(g.hidden_, 200, 250));
+ assertEquals([0, 255, 0, 38], Util.samplePixel(g.hidden_, 200, 150));
};
// Regression test for http://code.google.com/p/dygraphs/issues/detail?id=358