I am working on an NHL shootout game in XNA Game Studio. I had the basic prototype down, with player movement, shooting and grabbing the puck, and a goal. The only thing left was to detect when the puck should bounce off the posts of the goal, and when the puck goes into the goal. I could have just used multiple Rectangle objects, but I decided to figure out how to do Polygon Collision Checking. It would be good to know how to do it, for future reference.
Some Google searches revealed this link. I copied and pasted the function, and made some tweaks. I put it in a Polygon class, which stores a generic List<> of Vector2s. Then I added a funtion:
Then all I had to do was create the polygon collision bounds for all the objects, and say something like:
I'm glad I learned this, because I'll be able to use my Polygon class for lots of things in the future. Maybe later I can upload the source and/or upload a compiled DLL.
Some Google searches revealed this link. I copied and pasted the function, and made some tweaks. I put it in a Polygon class, which stores a generic List<> of Vector2s. Then I added a funtion:
public bool Intersects(Polygon other)
{
foreach (Vector2 point in other.points)
{
if(PointInPolygon(point))
return true;
}
return false;
}
Then all I had to do was create the polygon collision bounds for all the objects, and say something like:
if (puckBounds.Intersects(goalBounds))
{
// Make puck bounce here
}
I'm glad I learned this, because I'll be able to use my Polygon class for lots of things in the future. Maybe later I can upload the source and/or upload a compiled DLL.
