float EnemyHeight,EnemyWidth,PlayerHeight,PlayerWidth = 32;
D3DXVECTOR2 vEnemyPosition;
D3DXVECTOR2 vPlayerPosition;
RECT EnemyBoundingBox;
EnemyBoundingBox.top = vEnemyPosition.y - (EnemyHeight/2);
EnemyBoundingBox.bottom = vEnemyPosition.y + (EnemyHeight/2);
EnemyBoundingBox.left = vEnemyPosition.x - (EnemyWidth/2);
EnemyBoundingBox.right = vEnemyPosition.x + (EnemyWidth/2);
RECT PlayerBoundingBox;
PlayerBoundingBox.top = vPlayerPosition.y - (PlayerHeight/2);
PlayerBoundingBox.bottom = vPlayerPosition.y + (PlayerHeight/2);
PlayerBoundingBox.left = vPlayerPosition.x - (PlayerWidth/2);
PlayerBoundingBox.right = vPlayerPosition.x + (PlayerWidth/2);
Bounding box collision detection for a 2d game(Solved)
Author
Hi guys its my 1st time trying to implement some collision code for my game, basically i have 2 sprites and i want it so that when they collide i can give a responce. by the way i'm using c++ DX9
here is how i have made my bounding boxes
so can someone tell me what i do now to check for colisions?
[Edited by - Volvic on December 11, 2006 4:02:08 AM]
check to see if the rectangles are outside each other.
I think that's right. You should test it out though, I just wrote it off the top of my head...
// returns true if the two rects intersect.bool Collision(RECT a, RECT b){ if (a.right < b.left) return false; if (a.bottom < b.top) return false; if (b.right < a.left) return false; if (b.bottom < a.top) return false; return true;}I think that's right. You should test it out though, I just wrote it off the top of my head...
Author
I think i have got the right code for it now
// =========// Test collisions between player and enemy// =========void player_TestEnemyCollision(){ //=========== Player information D3DXVECTOR2 vPlayerPosition; g_Player.GetTranslation( &vPlayerPosition ); D3DXVECTOR2 vEnemyPosition; g_GhostPinky.GetTranslation(&vEnemyPosition); RECT EnemyBoundingBox; EnemyBoundingBox.top = vEnemyPosition.y - (EnemyHeight/2); EnemyBoundingBox.bottom = EnemyBoundingBox.top + EnemyHeight; EnemyBoundingBox.left = vEnemyPosition.x - (EnemyWidth/2); EnemyBoundingBox.right = EnemyBoundingBox.left + EnemyWidth; RECT PlayerBoundingBox; PlayerBoundingBox.top = vPlayerPosition.y - (PlayerHeight/2); PlayerBoundingBox.bottom = PlayerBoundingBox.top + PlayerHeight; PlayerBoundingBox.left = vPlayerPosition.x - (PlayerHeight/2); PlayerBoundingBox.right = PlayerBoundingBox.left + PlayerWidth; Collision(EnemyBoundingBox,PlayerBoundingBox); if (Collision(EnemyBoundingBox,PlayerBoundingBox)==true) { //Do a response here too the collision }}// =========// returns true if the two rect's intersect.// =========bool Collision(RECT a, RECT b){ if(a.bottom < b.top)return false; if(a.top > b.bottom)return false; if(a.right < b.left)return false; if(a.left > b.right)return false; return true;}
kanato post is correct, Volvic check your signs and a's and b's in your new code.
edit: thanks now you have changed it and make me look an old fool :(
edit: thanks now you have changed it and make me look an old fool :(
This topic is closed to new replies.
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