Collision Detection

[Flezria]

Hello guyse, i really dont understand collision detection, and i want it for my game. Anyone can tell me how to add a collision detection(just easy one) so you cant walk through walls.

Thanks from flezria

[WingedPanther]

2D? 3D? Sprite based? Other?

[Flezria]

Its in 2d, its going to be a space invaders game, when its done.

[CallinWire]

Just think of your sprites as rectangles. Each one will have a top, left, right, and bottom edges. Get the x or y coordinate value of each edge (assuming values get larger as you go down or right) , then compare them to see if they intersect:

// if the top edge of one sprite is below the bottom edge 
// of the other, then no collision occurs. 
// do the same for the other four edges
if (sprite1.topEdge < sprite2.bottomEdge) return false;

if (sprite1.bottomEdge > sprite2.topEdge) return false;
if (sprite1.leftEdge > sprite2.rightEdge) return false;
if (sprite1.rightEdge < sprite2.leftEdge) return false;
return true; // otherwise, they must have collided

[Flezria]

Thanks alot for the help, ill take a look on it