On Mon, Jun 07, 2004 at 12:00:19PM +0800, [EMAIL PROTECTED] wrote:
> Hi -
>
> Slightly off topic but,
>
> I am making an application that will display a heat map based on the value
> of a variable. I'm wondering if anyone has some sample code for generating
> a color on a gradient between color a and color b (red and green are
> traditional but something generic would be nice) based on the value of the
> variable?
>
> I guess this is the sort of thing you use for microarray displays/
> correlations etc. Cellular automata in this case but it should be useful
> to others in the list.
This is pretty straightforward in Java, for instance:
public Color mixColor(Color from, Color to, double amount) {
float x = (float) amount;
float y = (float) (1.0 - amount);
return new Color((int) (y * from.getRed() + x * to.getRed()),
(int) (y * from.getGreen() + x * to.getGreen()),
(int) (y * from.getBlue() + x * to.getBlue()));
}
This is nice for 'fluffy' viewing of new data, but for serious
analysis I'd agree with Dan's point about using a discrete scale
instead.
Thomas.
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