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XNA Rectangle.Intersects()

Started by Andy474 Jun 2, 2009 at 4:15 AM 3 replies 3.3k views

Original Post

Andy474

Jun 2, 2009 at 4:15 AM

Just a Quick Question : I am Writing a Pong game and have defined a rectangle


topXRect = new Rectangle(0, 0, ScreenWidth, -(ScreenHeight / 10));

now when i use


if(player[0].posRect.Intersects(topXRect))
{
}

does the Rectangle.Intersects(Rectangle) Function dectect the moment the Rectangles intersect, or when there is a large portion of the Rectangles Intersect? (i am trying to create a boundary so my pongRacket cannot leave the Game Screen)

adt7

Jun 2, 2009 at 4:32 AM

I believe Rectangle.Intersects() simple returns a boolean, true if the rectangles intersect at all, false otherwise.

Alternativly there is also Rectangle.Contains(), which returns true if the rectangle completely contains the other rectangle, and false otherwise.

Andy474

Author

Andy474

Jun 2, 2009 at 4:38 AM

Ok thanks, that's exactly what I thought XD

Machaira

Mod

338

Machaira

Jun 2, 2009 at 6:31 AM

Rather than checking every frame if the paddle is on the screen (which it seems is what you're doing) why not just do a check when the paddle moves to make sure it's still on the screen? You really only need to check the X property of the paddle, not do a whole Rectangle check, right?

Andy474

Author

Andy474

Jun 2, 2009 at 6:36 AM

yes, which is what I was doing originally checking if the yPos of my Racket was still on the screen, this worked! (& works)
The Reason I wanted to detect a collision Via Rectangles was to see if it was a viable method of detecting a collision between my racket and my Ball, However after testing this wont work as the Rectangles are colliding multiple time Per Second resulting in a "stuck" ball

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