Here's the image:
(http://baa.ovine.net/achannel.png)
and here's some code:
SETSCREEN 640,480,0
LIMITFPS 60
BLACKSCREEN
LOADSPRITE "achannel.png",0
WHILE TRUE
LOCAL x,y,a,b
IF KEY(2) THEN ALPHAMODE -1
IF KEY(3) THEN ALPHAMODE 1
DRAWRECT 105,105,100,10, RGB(0,0,255)
MOUSESTATE x,y,a,b
DRAWSPRITE 0, x,y
DRAWSPRITE 0,100,100
SHOWSCREEN
WENDBy default, the alpha channel on the red circle is ignored. If shows a solid circle. Hold 1 on the keyboard to apply the alphamode of -1 and the alpha channel works. Is this correct or should alphamode 0 also work?
All correct ;)
Alphamode 0 is No Alpha !
Right Alphamode 0 just uses all alpha above 0.5 as transparent. If you want it blended, use ALPHAMODE -1
For a glow effect ALPHAMODE -.7 or something. Or even +.5.