Thread: accessing elements in a 2d ArrayList

well, im almost done with my map editor except for one pretty big thing... i am having problems with drawing on the 2d ArrayList.

i start out by declaring and instantiating the 2d arraylist.

private ArrayList<ArrayList<Integer>> tileMap;
public TileMap(int rows, int columns){
        for(int r=0;r<rows;r++){
    		tileMap.add(new ArrayList<Integer>());
    		for(int c=0;c<columns;c++)
    			tileMap.get(r).add(-1);
}

i added a getTile(row,col) and a setTile(row,col,tile) method to make the rest of the code look cleaner

public void setTile(int row,int col,int number){
    	if(row>=0 && col>=0 && row<rows && col<columns)
    		tileMap.get(row).set(col,number);
   }
public int getTile(int row,int col){
    	return tileMap.get(row).get(col);
   }

then everything gets messed up when it draws. ive been trying very hard to figure it out but am having some difficulty.

public void mouseDragged(MouseEvent e){
	if(getTile(e.getY()/tileSet.tileHeight(),e.getX()/tileSet.tileWidth())!=tilePane.getCurrentTile())//if not already currentTile
	            setTile(e.getY()/tileSet.tileHeight(),e.getX()/tileSet.tileWidth(),tilePane.getCurrentTile());//make it currentTile
    	}

the x and y cords are flipped when drawing, but i feel that everything should be working as is.

maybe you are passing row and coloumn the wrong way around?

thats what i thought but it seemed right, ill check again