Could someone explain this code?

	Method render()
	
		Local drawY%, drawX%
		Local tOffY%
		Local gOffX%
		Local actualDrawX%, actualDrawY%
	
		For Local y% = 0 To Height - 1
			tOffY = 0
			
			For Local x% = 0 To width - 1
				drawX% = x
				tOffY:+ 15
				
				actualDrawX% = (((((((drawX * (TILEWIDTH + 2))) - ((TILEHEIGHT + 1) * x))) - (gOffx))) - x) + offsetx
				actualDrawY% = (((drawY * (TILEHEIGHT + 1)) + tOffY) + (y * (TILEHEIGHT / 2))) + offsety
						
				If actualDrawX < 0 - TILEWIDTH Or actualDrawY < 0 - TILEHEIGHT Or actualDrawX > GraphicsWidth() Or actualDrawY > GraphicsHeight() Then
					' // Dont render if the tile is off screen
				Else
					If tile[x , y].blocked Then SetColor 255 , 0 , 0
					DrawImage (floorImageSet, actualDrawX, actualDrawY, tile[x, y].floorStyle)
					SetColor 255, 255, 255
				EndIf
				
			Next
			
			gOffX%:+ 30
			
		Next
		
		For Local point:TPoint = EachIn pointList
			
			point.SetOffset(offsetx + (TILEWIDTH / 2), offsety + (TILEHEIGHT / 2))
			point.render()
			
		Next
	
	End Method