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Index › Programming Questions & Help › Syntax Questions › Handle to screen object
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Handle to screen object? (Read 306 times)
Kenry
Handle to screen object?
Jul 9th, 2009, 9:45am  
In a processing app that I'm writing, I have a function that does a bunch of drawing to the screen.  However, I also want to be able to draw to a PGraphics object.  I can have a function parameter that is the graphics object to draw to, but the problem I'm running into is in the syntax.  Specifically, I have to have code like:

if (canvas==null) {
   //draw to screen
   line(...);
} else {
  //draw to PGraphics object
  canvas.line(...);
}

When, really, it would be nice to just have at the top of the function
if (canvas==null) { canvas = screenHandle; }
and then everywhere I could just draw to the canvas as normal.

But, is there a way to get this handle to the screen to draw to?

Thanks!
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Paragon
Re: Handle to screen object?
Reply #1 - Jul 9th, 2009, 4:56pm  
You can find it in the Developer's reference to Processing. It's really pretty simple: you'll find it in the PApplet member "g".

Code:

void setup () {}
void draw () {
  drawCoolStuff(g); // draws cool stuff to the screen
}

void drawCoolStuff (PGraphics context)
{
  context.beginDraw();
  // draw some stuff
  context.endDraw();
}
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Kenry
Re: Handle to screen object?
Reply #2 - Jul 10th, 2009, 10:40am  
Perfect!  Thanks, I would never have found that on my own.
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