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Collision Questions

Started by Fredrik Hellman Jan 3, 2001 at 12:46 PM 3 replies 350+ views

Original Post

Jan 3, 2001 at 12:46 PM

Hello! I read an article in this forum some minutes ago about 2D-collisions (from July 2000). It described how to detect if two objects were overlapping each other. But still there is one thing that is unclear for me: If I have detected that two objects have collided, and I want the two objects to bounce from each other, in two different directions. How can I check from what direction the two objects were coming from? I have an idea, but I don''t know if it is good: * I make a history list of the latest moves of the object. From that I can calculate a direction, in some way

. Would this work, or is there a better way to do it? Fredrik Hellman mrhellman@telia.com

Fredrik Hellman

Author

Fredrik Hellman

Jan 4, 2001 at 4:09 AM

I understand. Thank you very much!

If you have any source codes or links to source codes about this type of collisions, please reply.

Fredrik Hellman
mrhellman@telia.com

evaclear

Jan 4, 2001 at 10:33 AM

Well here is some pseudo code for the collision.

float sprite_Xvelocity;
float sprite_Yvelocity;
float sprite_Xpos;
float sprite_Ypos;

while(true)
{

if(collision occurs on the X axis)
sprite_Xvelocity = -sprite_Xvelocity;

if(collision occurs on the Y axis)
sprite_Yvelocity = -sprite_Yvelocity;

sprite_Xpos = sprite_Xpos + sprite_Xvelocity;
sprite_Ypos = sprite_Ypos + sprite_Yvelocity;

}

That will get you a basic reverse collision going. You can get more indepth with it if you calculate the angle the sprite hits at and such but in a side scroller it is often not nessassary.

Fredrik Hellman

Author

Fredrik Hellman

Jan 5, 2001 at 9:37 AM

Thank you!

Fredrik Hellman
mrhellman@telia.com

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