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Index › Programming Questions & Help › Syntax Questions › color change to transparent transition

hhhenryhhh YaBB Newbies Offline Posts: 6	color change to transparent transition Jan 5th, 2007, 6:18pm   Hi, I've just started using Processing and am having trouble with the color class/modes. I am trying to have a line color go from white to green, and then disappear via alpha decrease. Any help on how to achieve this would be greatly appreciated.

fjen God Member Offline Posts: 965	Re: color change to transparent transition Reply #1 - Jan 5th, 2007, 6:38pm   split the line into smaller pieces (multiple lines) and then set stroke() for each of these in a color between the first and the last. have a look at the second colorBetween() there for an example on how to mix two colors: http://snippet.seltar.org/index.php?pid=3&sid=29 F

hhhenryhhh YaBB Newbies Offline Posts: 6	Re: color change to transparent transition Reply #2 - Jan 5th, 2007, 10:55pm   thanks!! but now I'm getting a "GL_ERROR at before bind: 0505  GL_OUT_OF_MEMORY" after the application runs for sometime. know what I should look into to fix this?

fjen God Member Offline Posts: 965	Re: color change to transparent transition Reply #3 - Jan 5th, 2007, 11:59pm   not sure what's happening there. can you post your code or give a link? F

hhhenryhhh YaBB Newbies Offline Posts: 6	Re: color change to transparent transition Reply #4 - Jan 8th, 2007, 4:46pm   ok, I've narrowed it down to the text causing the error. Inside draw(): PFont fontA = loadFont("Interstate-Regular-48.vlw"); textFont(fontA,48); text("GRASS 48",50,50);

fjen God Member Offline Posts: 965	Re: color change to transparent transition Reply #5 - Jan 8th, 2007, 5:17pm   easy. don't reload the font on every iteration of draw. this is not only filling your memory slowly, it is also very slow. do something like: Code: PFont pf; // use setup for things like loading images, fonts, ... void setup() { pf = loadFont( "....vlw" ); textFont( pf ); } void draw() { text( "abc", 10, 10 ); } F

hhhenryhhh YaBB Newbies Offline Posts: 6	Re: color change to transparent transition Reply #6 - Jan 8th, 2007, 6:04pm   yes of course...great, thanks!!

mflux Senior Member Offline Posts: 388	Re: color change to transparent transition Reply #7 - Jan 9th, 2007, 1:35am   if you're doing openGL, then you can do something like: Code: size(200,200,OPENGL); noFill(); beginShape(); //white, full opacity stroke(255,255); vertex(0,0); //red, zero opacity stroke(255,0,0,0); vertex(200,200); endShape();
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