Processing 1.0 - Processing Discourse - Sprites for Processing Library

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Sprites for Processing Library (Read 985 times)

Quark

Sprites for Processing Library
Feb 5^th, 2010, 3:58am

Keaton_R said
Quote:

Quark, I was wondering if you could add in some methods to check whether or not a sprite collides with a point (an x and y coordinate). I need to be able to check whether I am touching a sprite on a touch-screen device, so the mouse events don't help. I need to be able to provide the x and y coordinate of where I'm touching the screen to the sprite class so that the sprite can tell me whether or not I'm touching it.

I haven't programmed for touch screen devices but when you touch the screen does that not create a 'button click' event?

If it does then if you have a sprite called s then
Code:

s.respondToMouse(true);

means that the sprite will respond to mouse events by calling this method (code taken from S4P_Showcase example)

Code:

/*
 * S4P Eventhandler called mouse is PRESSED, RELEASED
 * or CLICKED over the sprite.
 * 
 * @param sprite
 */
void handleSpriteEvents(Sprite sprite) { 
  println("Mouse clicked");
  if(sprite.eventType == Sprite.CLICKED){
    selSprite = sprite;
    updateGUI();
  }	
}

Note other events include PRESSED, RELEASED and DRAGGED

You can also make the sprite draggable with
Code:

s.setDraggable(true);

Does this help?

Keaton R

Re: Sprites for Processing Library
Reply #1 - Feb 8^th, 2010, 1:23pm

Quark wrote on Feb 5^th, 2010, 3:58am:

I haven't programmed for touch screen devices but when you touch the screen does that not create a 'button click' event

In my case, no it does not create a "button click" event. In processing, I can get a List of "new touches", "moved touches", and "released touches" every frame. Each touch has an x and y coordinate. I need to check whether or not these "touches" collide with a sprite.

My first idea was to create a sprite at the location of each touch and see if it collides with my other sprites. I ran into some issues though, like creating 60 sprites per second and crashing processing if I didn't remove my finger quickly enough.

I'm may try to make a class that associates one of my Touch objects with one of your Sprite objects that knows to make a new TouchSprite whenever I touch the screen. Knows to move it when I move my finger, and knows to delete it when I remove my finger. I'll need to get a better understanding of your library first though.

I think that simply being able to check if a Sprite contains a Point object would suit me for now though. Seems like it would be useful in a lot of situations.

Quark Senior Member Offline Posts: 411 UK	Re: Sprites for Processing Library Reply #2 - Feb 9^th, 2010, 12:06pm Yes I agree it would be useful and it now available in Sprites for Processing V1.0.3 If you have a sprite object called s then the following Code: s.isOver(x,y) will return true if position x,y is over a non-transparent pixel in the sprite else it returns false.

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