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Teshi wrote:Hi im trying to do collision with walls myself but its just hitting the fan. It works kinda, but when i add more walls it just goes to shit. Could anyone offer any help? Im not the best coder and my head is just melting trying to solve this. The problem i think is because of the two "left" walls, collision works for one of them but not the other and i know its to do with how i reset the playercanwalk variable but i dont know how to write it in such a way that it works

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map =                                  
{
  walls = 
  {
    wall1 = 
    {
      id = 1, x = 100, y = 605, w = 190, h = 35, block = "up"
    },
    wall2 = 
    {
      id = 2, x = 300 - 40, y = 640-200, w = 35, h = 195, block = "left"
    },
    wall3 =
    {
      id = 3, x = 100, y = 735, w = 300, h = 35, block = "down"
    },
    wall4 =
    {
      id = 4, x = 65, y = 605, w = 35, h = 165, block = "left"
    },
    wall5 =
    {
      id = 5, x = 400, y = 440, w= 35, h = 330, block = "right"
    }
  }
}

function drawWalls(x, y, w, h) 
  love.graphics.setColor(50, 50, 200, 255)
  love.graphics.rectangle("fill", x, y, w, h)
end

function updateWalls()     
  local i,v
  for i,v in pairs(map.walls) do
    local px,py = player:getPos()
    local pxo, pyo = player:getOffset()
    local x, y, w, h, block = v.x, v.y, v.w, v.h, v.block 
    local col = checkCollision(px-pxo, py-pyo, player.width, player.height, x, y, w, h)
    if col == true then
      if block == "left" and player.canwalk.left == true then       
        player.canwalk.left = false                                                     
        
      elseif block == "up" then
        player.canwalk.up = false
        
      elseif block == "down" then
        player.canwalk.down = false
        
      elseif block == "right" then    
        player.canwalk.right = false
      end
    end
    
    if col == false then
      if block ~= "left" and player.canwalk.left == false then
        
        player.canwalk.left = true
      
      end
      if block == "right" then
        player.canwalk.right = true
      
      end
      if block == "up" then    
        player.canwalk.up = true
        
      end
      if block == "down" then
        player.canwalk.down = true
        
      end
    end
  end
end

function CheckCollision(x1,y1,w1,h1, x2,y2,w2,h2)
	return x1 < x2+w2 and
		x2 < x1+w1 and
		y1 < y2+h2 and
		y2 < y1+h1
end

Vimm wrote:
Why dont you test the collision using the method on the wiki? https://love2d.org/wiki/BoundingBox.lua

Code: Select all

function CheckCollision(x1,y1,w1,h1, x2,y2,w2,h2)
	return x1 < x2+w2 and
		x2 < x1+w1 and
		y1 < y2+h2 and
		y2 < y1+h1
end

DaedalusYoung wrote:Set the player.canwalk booleans all to true before you start the for loop, and get rid of them in the if col == false block. My guess is that alone should work, but you could also try that once you determined that there is a collision, you iterate the walls table, then as soon as you've found the block direction you break out of that loop. The problem is that you find a collision, so you set col to true and search the table to determine the block direction and set player.canwalk to false. All fine, but then you keep searching the walls, only to find there is no collision on later tiles, so you reset the player.canwalk back to true. If you'd break out of the loop after you've found the first collision, no further check will be done, so the player.canwalk boolean will not be reset.

Also...

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local i,v

This is completely unnecessary.

http://www.lua.org/pil/4.3.5.html wrote:The loop variables are local to the loop body (...)