collideMap() only in the main loop scope?

spikey

I couldn't find the problem, why my collision boxes had no effect. Then I realized, that calling collideMap(sprite) outside of my function, namely in the main loop, make them work. Did you make the same experience? If not I maybe have to change the order of function calls, or dig where the real problem lies in my code.

Its a long time ago, I tried something with map collision, and the last time, I postponed the project, so I am a newbie to map collisions and this could be very obvious to you.

This pseudo code worked: the collision boxes worked

loadMap("level1") // a map with collision boxes I draw in the map editor
// sprites[] is a global array of sprites
// players is a global int with the number of sprites/players
loop
   updateSprites()
   drawMap()
   for i = 0 to players loop
      collideMap(sprites[i])
   repeat
   drawSprites()
repeat

The following code caused the collision borders to be ignored.

loadMap("level1") // a map with collision boxes I draw in the map editor
// sprites[] is a global array of sprites
// players is a global int with the number of sprites/players
loop
   updateSprites()
   drawMap()
   for i = 0 to players loop
     updatePlayers(i)
   repeat
   drawSprites()
repeat

function updatePlayers(player)
   collideMap(sprites[i])
return void

spikey

Gosh! it works now! After putting the function back in. So, sorry. But no clue, yet why.
I get some coffee.

spikey

Oh, I just found out how to make it fail again.
If I do a getSpriteLocation() before the collideMap() call, the collision box have no effect and the sprite can walk through the boxes.

This inhibits the collision boxes:

pos = getSpriteLocation(sprite)
collideMap(sprite)
// do some clamping of the coordinates
setSpriteLocation(sprite)

This works:

collideMap(sprite)
pos = getSpriteLocation(sprite)
// do some clamping of the coordinates
setSpriteLocation(sprite)

I think I just have to study these commands a bit more and read more example code.

waldron

@spikey i usually drawmap() then updatesprites() the sprite location i put at the top of the loop so that shouldn't effect the collision not in my experience anyway maybe because the sprites are getting updated before the map

spikey

@waldron i appreciate that guidance. I will do it like this.