I want to masking

Processing Beginners
1

Hello, I want masking what moves.

source : ( Hue \ Examples \ Processing.org )
int barWidth = 20;
int lastBar = -1;
int whichBar = mouseX / barWidth;
if (whichBar != lastBar) {
int barX = whichBar * barWidth;
fill(mouseY, height, height);
rect(barX, 0, barWidth, height);
lastBar = whichBar;

mask:
mask.ellipse(100,100,100,100);

I just can’t find the tutorial. Please let me know.

2

Hello,

Can you provide more clarity on what you are trying to do?

You tagged as Beginners and Homework and this may require some more of a skill level and advanced topics.

Please format your code as a courtesy to the community:
https://discourse.processing.org/faq#format-your-code

There are resources (tutorials, references, examples, etc.) here:
https://processing.org/https://processing.org/

And examples that come with Processing:

image

This is an “Intermediate” tutorial:
https://processing.org/tutorials/pixels/

Reference:
https://processing.org/reference/PImage_mask_.html

There are examples in the Image and Image Processing sections ready to run.

And a bit of searching… I found some good examples out there.

UPDATE 2021-07-23

This tutorial discusses PGraphics:
https://processing.org/tutorials/rendering/
Reference:
https://processing.org/reference/PGraphics.html

:)