Creating Layers in Processing

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Creating Layers in Processing

in Programming Questions • 1 year ago

I need to overlay a .PNG file with transparency on my Processing sketch.

However, my existing code does not constantly update the entire canvas (and it would be time-consuming to recode it for that.)

What are my options for creating a second layer so that the .PNG file can be drawn in front of the existing sketch without having to recode it?

I tried using get() to constantly grab the screen and redraw it, but it's too slow. I'm also looking at PGraphics and the Processing Layers library, but they're a little overwhelming for me.

Thanks!
C

Replies(1)

tfguy44

Re: Creating Layers in Processing

1 year ago

PGraphics would be the way to go. Move all your drawing of your continuously updating screen to a PGraphics object instead. Changes involve:

- Creating the PGraphics object at global scope: PGraphics pg;

- Setting it up in setup(): pg = createGraphics( width, height );
- pg.beginDraw(); in draw()

- moving draw functions to use it. i.e: ellipse(...) -> pg.ellipse(...)

- pg.endDraw(); in draw()

- Using it: image( pg.get(0,0,width,height), 0,0);

Then you can add your transparent png over that if you need to.

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