Collision Help

[Pyromaniac]

Hi "Lovers", I'm Mainly creating a topic for help with my games collison. I've been having trouble with a few collision detection libs but can't figure out how to use BoundingBox.lua. Can someone give me a rundown on what to do with it?

[Petunien]

I've this old collision demo on my disk. It's fully commented out. Hope it helps.

Move the player's rectangle with the arrow keys and collide with the white rectangle.

Please ask if you got questions.

[Pyromaniac]

I've encountered an error when adding the collision to my code.

Code: Select all

main.lua:52: attempt to call global 'CheckCollision' (a nil value)

This is lines 52 onward.

Code: Select all

             if CheckCollision(char_x, player_y, 25, 25, ex_x, ex_y, 25, 25) then -- Checks if player and the white rectangle are colliding, if that true -> Print "Ouch!"
		      love.graphics.print("Collided", 10, 10)
              
        
    
end	



function CheckCollision(ax1, ay1, aw, ah, bx1, by1, bw, bh)

  local ax2,ay2,bx2,by2 = ax1 + aw, ay1 + ah, bx1 + bw, by1 + bh
  return ax1 < bx2 and ax2 > bx1 and ay1 < by2 and ay2 > by1
  end
end

[josefnpat]

Please supply your .love so we can help you debug.

And next time, please post this in the Support and Development sub-forum.

If possible, could a mod please move this thread?

[Pyromaniac]

Sorry for posting this in the wrong section. Attached is the .love file.

[Petunien]

We should have found the error already looking at your posted code.

The "if" that checks for collision doesn't have a "end". The CheckCollision-function does have two instead.

Just put the below one after the if.

Code: Select all

if CheckCollision(char_x, player_y, 25, 25, ex_x, ex_y, 25, 25) then
    love.graphics.print("Collided", 10, 10)  
end   



function CheckCollision(ax1, ay1, aw, ah, bx1, by1, bw, bh)

  local ax2,ay2,bx2,by2 = ax1 + aw, ay1 + ah, bx1 + bw, by1 + bh
  return ax1 < bx2 and ax2 > bx1 and ay1 < by2 and ay2 > by1
end

And when that's done, attention! Your parameters on the Collision check are nil!