Hi!
I am currently using LibGDX & Tiled in order to create a test game for collision and other mechanics, to get used to them.
The problem is that the collision method I am using is causing a weird issue. I believe it is most likely a problem with the cell size… anyways, check out my code:
private boolean isCellBlocked(float xx, float yy){
Cell cell = collisionLayer.getCell((int) (xx/collisionLayer.getTileWidth()), (int) (yy/collisionLayer.getTileHeight()));
return cell != null && cell.getTile() != null && cell.getTile().getProperties().containsKey(blockedKey);
}
public boolean collidesRight() {
for(float step = 0; step < player.height; step += collisionLayer.getTileHeight())
if(isCellBlocked(player.x + player.width , player.y + step))
return true;
return false;
}
public boolean collidesLeft() {
for(float step = 0; step < player.height; step += collisionLayer.getTileHeight())
if(isCellBlocked(player.x, player.y + step))
return true;
return false;
}
public boolean collidesTop() {
for(float step = 0; step < player.width; step += collisionLayer.getTileWidth())
if(isCellBlocked(player.x + step, player.y + player.height))
return true;
return false;
}
public boolean collidesBottom() {
for(float step = 0; step < player.width; step += collisionLayer.getTileWidth())
if(isCellBlocked(player.x + step, player.y))
return true;
return false;
}
The issue I am having is shown below.
I believe the issue is with the cell grid. When a collisionLeft occurs, it is right next to the block (well, 1 pixel off…). The same goes for the bottom collision, it is perfect! Top & Right collision though… not even close. The size of the tiles are 32x32 if that helps.
Any advice would be wonderful! 
Also, I notice that when using tiled and moving, you can see the map being de-rendered(?) slightly on the sides. How would I fix this issue?
Thanks!
-A