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Index › Programming Questions & Help › Syntax Questions › [Solved] copy() puts a black background
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[Solved] copy() puts a black background (Read 695 times)
nebulus
[Solved] copy() puts a black background
Sep 3rd, 2009, 9:18am  
Hello,

I would like to build a scrolling ticker with bitmap tiles for each letter.

So I load a png picture with letter drawn on a purple background and I use the copy() function to get 32*32px tiles.

The problem is the purple is changed to black.

Could someone please help ?
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« Last Edit: Sep 3rd, 2009, 7:38pm by nebulus »  
 
PhiLho 
Re: [Total beginner] copy() puts a black background
Reply #1 - Sep 3rd, 2009, 11:21am  
Can you show us your code?
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nebulus
Re: [Total beginner] copy() puts a black background
Reply #2 - Sep 3rd, 2009, 11:28am  
Sorry, here it is :
Code:

//Font sprites
	  PGraphics  pg;
	  PImage     tickerFontSpriteSheet;
	  int	  tickerLetterWidth	 = 32;
	  int	  tickerLetterHeight	= 32;
	  int	  tickerSpeed		 = 1;
	  
	  
	  
	  
void setup()
{
	
	  size(800,600, P2D);
	  frameRate(20);
	  background(#330033);
	  tickerFontSpriteSheet = loadImage("images/berlin.png");
	  pg = createGraphics(800, 600, P2D);



}








void draw()
{	  
  
	  int i=1;

	  pg.beginDraw();
	  pg.background(#330033);
	  pg.copy(tickerFontSpriteSheet, tickerLetterWidth*i, tickerLetterHeight*i, tickerLetterWidth, tickerLetterHeight,  tickerLetterWidth*i,0, tickerLetterWidth, tickerLetterHeight);
	  

	  noFill();
	  	   
	  pg.endDraw();
	  image(pg, 0, 0);
	  
}

It seems there is a problem with loops or something because the purple now slowly fades to black.
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PhiLho 
Re: [Total beginner] copy() puts a black background
Reply #3 - Sep 3rd, 2009, 12:59pm  
Ah, it is clear now.
copy() says: "No alpha information is used in the process"
You should use image() instead.
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nebulus
Re: [Total beginner] copy() puts a black background
Reply #4 - Sep 3rd, 2009, 7:37pm  
Thanks a lot, i get it working now Smiley
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