Transform and mouseX, mouseY

Programming Questions

lia_m

in Programming Questions • 2 years ago

Hi all,

apologizing in advance for the basic questions as I am still very new to programming.

I basically have created an array of objects that revolve around the center using rotate and transform. This is in the display function of the object, where theta is a random number.

pushMatrix ();

rotate (theta);

translate (distance, 0);

stroke (0);

fill (175);

imageMode (CENTER);

etc etc

popMatrix ();

The first problem is that I want the objects to react when they come into contact with mouseX, mouseY using the distance function. Unless I am missing something (which is very likely), mouseX and mouseY don't seem to exist in the same 'transformation matrix' that the objects do, so I can't use the distance function. That's one issue.

Another one is that since the coordinates of each generated object from the array are (0, 0) because their locations are based on the transformation, I dont know how you would get the distance of mouseX, mouseY relative to them.

Any help at all would be most appreciated.

Replies(2)

cottonycl..

Lucky you.

2 years ago

Lucky for you, I've been actually working on this for my bouncing ball program. You actually don't need the distance function for this. So here's how it works: (see here: http://forum.processing.org/topic/rotation-and-mouse-placement )

Note that the person above was not me, and I can't really help you unless there's a problem concerning an object that rotates on mousePress.

blindfish

Re: Transform and mouseX, mouseY

2 years ago

If you have what you consider a 'basic question' (though in fact this problem isn't necessarily that simple) search the forum:

http://forum.processing.org/topic/coordinates-from-inside-push-pop-matrix

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