[patch][ccla]Heatmap

[ruanqi]

A heatmap is a graphical representation of data where the values taken by a variable in a two-dimensional map are represented as colors. Heatmap in this patch only works with canvas-enabled browsers, and shaped heatmap is supported. User can customize color trasition function.

var heatmap = new dojox.geo.charting.Heatmap("map");
var data = [];
for (var i = 0; i < 120; i++) {
    data.push(getPoint());
}
heatmap.setData(data);
heatmap.render();

And there are 2 testcases in the patch.

[ruanqi]

Normal heatmap

[ruanqi]

Heatmap with customized color theme

[ruanqi]

Heatmap within a USA map shape

[Adam Peller]

update from Rock:

1. change heatmap to a generic widget, it can be overlaid on normal element by given node/id;
2. introduce "opacity" parameter to see the node under heatmap;

[Adam Peller]

updated patch from Rock/Qi? Ruan (IBM, CCLA)

[Tom Trenka]

Didn't quite realize where this patch was, taking it from Eugene.

[Tom Trenka]

Based on the canvas-only approach, I don't think we can get this out for 1.6, particularly for dojox.charting (for which this was originally written). However, I *can* see taking the basic approach and using it as a basepoint for something a lot more generic.

In the future, I would recommend that if something can't be done using dojox.gfx (in terms of charting)...that we'd find a different place for it to live until it *can* be done using gfx.

[bill]

Marking for future (i.e. until we get a patch that runs on IE), as per today's meeting discussion.

[cjolif]

As ttrenka said, I think it should be moved out of charting into its own module. It should be moved to AMD as well.

[Kitson Kelly]

Should be a community module/package instead of being added to DojoX at this point.