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Author |
Topic: problem with alpha (Read 310 times) |
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paul
 
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problem with alpha
« on: Oct 17th, 2003, 8:38pm » |
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hi all,
i just want a white line, on a black background to go from top to the bottom of my window. if i press the mouseButton, the lines previousley drawn, should fade out.
i draw a black rect in the beginning of every frame with a alphaValue of 255 and while the mouse is pressed 100.
but if i press the mousebutton all lines are white - like the alphavalue is 0.
what do i do wrong?
would be nice if somebody could help me...
thx, paul
i'm using rev065 on osX. here is my code:
int numberOfLines;
int count;
float dist;
int alphaValue;
void setup()
{
size(200,200);
background(0);
numberOfLines = 40;
dist = height / numberOfLines;
count = 0;
alphaValue = 255;
}
void loop()
{
fill(0,0,0,alphaValue);
rect(0,0,width,height);
if (mousePressed == true)
{
alphaValue = 100;
}
else
{
alphaValue = 255;
}
stroke(255);
int y = count % numberOfLines;
line(0, y*dist, width, y*dist);
count++;
}
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