Method to 'fill' a non rectangular shape with a pattern

[GoodJuJu]

I want to fill a non-rectangular shape with a pattern.

Filling a rectangular shape is not a problem… all I need to do is to find the top left, bottom right coordinates and then not exceed them in my loop placing the pattern elements.

Filling a circle should also be fairly straightforward, find the centre but do not exceed the radius… but I’m struggling to think how I could do this with a different shape, for example a star?

Does anyone know of a way to identify a shape and use it as some kind of mask?

Conversely, is it possible to flip this idea and fill everything outside of a shape.

Thank you in advance…

[glv]

Hello @GoodJuJu,

@GoodJuJu

Does anyone know of a way to identify a shape and use it as some kind of mask?

A related topic:

Filling a PShape

I’d like to be able to generate an arbitrary shape and fill it with a simple pattern. Drawing the shape is easy - something like this would do: void setup(){ size(650, 650, P3D); smooth(8); translate(200, 200); beginShape(); vertex(random(100),random(100)); vertex(random(100), random(100)); vertex(random(100), random(100)); vertex(random(100),random(100)); endShape(); } However, if I wanted to fill in that shape with small blue strokes of circles, I would have no …

I modified code above to have 2 PGraphics and did this:

pg2.mask(pg1);

The resources here will have more details:
https://processing.org/

References:

• https://processing.org/reference/PImage.html
• https://processing.org/reference/PImage_mask_.html
• https://processing.org/reference/texture_.html
• See tutorials on PShapes and Images and Pixels

:)

[GoodJuJu]

I am so sorry I didn’t reply sooner… thank you so much for your help.

The links you sent were really useful