Re: Colour Gradient

[Peter Krueger <pkrueger appss de>]

On Tue, 2 Mar 2004, Matthew A Tobiasz wrote:
> How could I make a widget that shows a colour gradient (eg. a widget that goes
> from one colour to another, that can be used as a scale for a graph).  Like
> the ones in the GIMP, that are used for colour selection of the individual
> colour componenets (hue/saturation/value/red/green/blue).  Thanks.
Hello Matthew,
I suggest you use a GtkDrawingArea. Connect to the expose-event to draw
the color gradient and the selection mark. You can use widget.allocation
to determine the size of the widget, so you can interpolate the color
values from one end to the other.
Connect to the button-press-event and motion-notify-event to move the
selection mark on the gradient.

Regards,
                    Peter
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