Drawing to PApplet.getGraphics(), vs PApplet.g.image.getGraphics()

Programming Questions

Dan Berni..

Drawing to PApplet.getGraphics(), vs PApplet.g.image.getGraphics()

in Programming Questions • 3 years ago

I'm drawing java.awt.Shapes with java.awt.Graphics2D.fill(shape), and I've tried getting the Graphics2D from both PApplet.getGraphics(), and PApplet.g.image.getGraphics().

I've found that using PApplet.getGraphics() is *way* faster, but at the end of Processing's draw() method, it erases my shapes.

I've found that using PApplet.g.image.getGraphics() is way *slower*, but my shapes remain after the draw() method.

What's the difference here? Can I get the speed of the first, but have it not erase my changes? Am I going about this completely wrong?

Replies(2)

owaunandr..

Re: Drawing to PApplet.getGraphics(), vs PApplet.g.image.getGraphics()

3 years ago

Lifesaver!

Two (2) things you can try is use either a color [] array or a PImage's pixel array to store the values that way it is still available after the loop.

Can you give an example of PApplet.getGraphics()

Dan Berni..

Re: Re: Drawing to PApplet.getGraphics(), vs PApplet.g.image.getGraphics()

3 years ago

Grabbing the color array or pixel array would work, but I'm writing the WordCram library ( http://code.google.com/p/wordcram/ ), so I don't know what other code the user might have put in the draw() method. If I do my drawing right to the PApplet.getGraphics(), grab its pixels, and then somehow replace them after draw() ends, I'd be overwriting their changes.

Here's an example of my code -- the "parent" variable is the sketch, what you'd normally refer to as "this":

boolean drawToParent = true; // This lets me toggle between the two

Graphics2D g2 = (Graphics2D)(drawToParent ? parent.getGraphics() : parent.g.image.getGraphics());

g2.fill(shape); // some java.awt.Shape

Top Reply