... Say I want to draw a color gradiant (shade of colors)
from RGB(255,127,0) to RGB(0,127,255) [I put arbitrary RGB values
here since this can be the case: I ask the user the start and end
colors and (s)he can place &c000000 or click on a Canvas rect to
choose a color in the OS palettes]
How can I do that ?
Doing a simple shade of colors from say RGB(255,0,0) to
RGB(0,255,0) can be considered as simple (I start to decrease the
.Red atom from 255 and start to increase the .Green atom from 0).
But for "complex colors", I'm short of ideas.
I think you've mostly got it.
For example, if you want to draw a color gradient from red to green, you do:
start red 255,0,0
...
end green 0,255,0
each step of the way, you linarly interpolate what color to draw.
Something like:
color = (1 - step#) * start / #steps + step# * end / #steps
If you look at the source to my Gadget program, it does this a lot
and has the exact code. See:
http://www.finseth.com/realbasic/index-gadget.php
If you are doing a Photoshop-like color area, you do the same thing,
but on two axes at once.
Other areas involve other types of scaling math, but the concept is
the same.
Craig
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