help get() pixels from Image

Programming Questions

hey_lisaaa

in Programming Questions • 2 years ago

Basically, I have a background image that I'm adding a layer to, and then I want to erase the layer to reveal the background image again.

So I have a PImage copy of the background that I'm getting pixels from, and I want to be able to get the pixel at the place where the mouse is, as well as the space surrounding it. I know the that for the get method, you have get(mouseX, mouseY, xWidth, yHeight), but instead of it getting a square shape of the pixels around it, is there a way to get a circular shape around the point where the mouse is?

Also, for some reason, when I draw onto the screen to reveal the background again, it always reveals itself temporarily, but then the layer covers what I just drew on the screen, but then when I click the screen, everything I drew previously reappears. How do I keep the layer from covering my picture over and over again?

I don't want to have my code floating around the internet since this is a project, so if you want, I can message it to you.

Thanks!

Replies(1)

PhiLho

Re: help get() pixels from Image

2 years ago

I have some code floating around the Internet... Here is one:
http://bazaar.launchpad.net/~philho/+junk/Processing/view/head:/_QuickExperiments/_Interactive/RevealImage/RevealImage.pde
But the shape is square. In the ChangePixels() method, I think you just have to check that i, j isn't too far of x, y.
if (dist(i, j, x, y) > HALF_HOLE_SIZE) continue;

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