And left collsion not working.
I have Wall enities on all 4 sides.
But it bounces only when hitting the center.
Here's the code,
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | struct minkowskirect{
v2 Center;
v2 Dim;
};
internal
minkowskirect MinkowskiSum(entity* A,entity* B){
minkowskirect Result = {};
Result.Center = (A->Pos - B->Pos);
Result.Dim = 0.5*(A->Dim + B->Dim);
return Result;
}
internal
b32 CheckCollision(entity* Test,entity* A){
b32 Result = false;
minkowskirect Rect = MinkowskiSum(A,Test);
if(AbsoluteValue(Rect.Center.x) < Rect.Dim.x && AbsoluteValue(Rect.Center.y) < Rect.Dim.y){
/* collision! */
float wy = Rect.Dim.x * Rect.Center.y;
float hx = Rect.Dim.y * Rect.Center.x;
#define CollideTop 1
#define CollideLeft 2
#define CollideRight 3
#define CollideBottom 4
if (wy > hx)
if (wy > -hx)
Result = CollideTop;/* collision at the top */
else
Result = CollideLeft;/* on the left */
else
if (wy > -hx)
Result = CollideRight;/* on the right */
else
Result = CollideBottom;/* at the bottom */
return Result;
}
|
here's main ball collision code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | Ball->Pos = MoveEntity(Ball,Input); b32 BallCollided = CheckCollision(Player,Ball)|CheckCollision(Enemy,Ball)|CheckCollision(WallRight,Ball)|CheckCollision(WallLeft,Ball)|CheckCollision(WallTop,Ball)|CheckCollision(WallBottom,Ball); if(BallCollided) { switch (BallCollided){ case CollideTop:{ Ball->ddPos.y = -Ball->ddPos.y; }break; case CollideBottom:{ Ball->ddPos.y = -Ball->ddPos.y; }break; case CollideLeft:{ Ball->ddPos.x = -Ball->ddPos.x; }break; case CollideRight:{ Ball->ddPos.x = -Ball->ddPos.x; }break; default: break; } Ball->Pos = MoveEntity(Ball,Input); } |