How to 'compare' information from an array with coordinates?

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pasteta

How to 'compare' information from an array with coordinates?

in Programming Questions • 2 years ago

I'm new to processing so excuse me if I'm asking a stupid question.

I've been looking around a bit, but cannot figure out the answer.

I have an image with a green area (0,255,0) on it. I also have an red ellipse.

Now I want that when the red ellipse moves over / touches the green area, something will happen.

I made an array of the image, because I don't know how else to find the green area. And from the ellipse I have only the coordinates.

ellipse(mouseX,mouseY,30,30);

img = loadImage(image.png);

img.loadPixels();

for (int i = 0; i < img.pixels.length; i++)

{

if(img.pixels[i] == color(0,255,0))

}

Now I don't know how to make the interaction between those two.

I want to get that when the red circle is on the green area, he will do something.

Does anyone know how I can solve this?

Replies(3)

cedrickie..

Re: How to 'compare' information from an array with coordinates?

2 years ago

you can check color at a specific coordinate using the get() function for example.
but sounds like you dont need to check for colors. a circle rect intersection check might work in your case.
see that example :
http://70.32.109.151/visuals/?visualID=8004

pasteta

Re: Re: How to 'compare' information from an array with coordinates?

2 years ago

Well, the colors do matter. This is only step 1, but I want to add later that when the red circle touches some black lines or a blue square something else happens.

To explain it a little more, I'm trying to make a small game - a maze in which you have to go through with the red circle (that is now following your mouse) without touching the black lines. The green area is the finish.

Another thing I was thinking about, was to make the ellipse an array too.

I'm wondering now if somehow I can make an image of that ellipse of which I can make an array again? Maybe by making a screenshot or something?

With the get() function it's going to be hard (I think?), because the coordinates of green area aren't fixed.

pasteta

Re: Re: How to 'compare' information from an array with coordinates?

2 years ago

Ok, I've used the get(); function to make a screenshot of the whole screen.

PImage screenshot = get();
image(screenShot, 0, 0);

The ellipse gets on the screenshot, and the screenshot is an image now.

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