CadEditor.FormMain.drawActiveTileStruct C# (CSharp) Method

        private void drawActiveTileStruct(Graphics g, Rectangle visibleRect)
        {
            int TILE_SIZE_X = (int)(blockWidth * curScale);
            int TILE_SIZE_Y = (int)(blockHeight * curScale);
            if (curTileStruct != null)
            {
                int WIDTH1 = curTileStruct.Width;
                int HEIGHT1 = curTileStruct.Height;
                for (int x = 0; x < WIDTH1; x++)
                {
                    for (int y = 0; y < HEIGHT1; y++)
                    {
                        int index = curTileStruct[x, y];
                        Rectangle tileRect;
                        if (ConfigScript.getScreenVertical())
                            tileRect = new Rectangle(curDy * TILE_SIZE_X + y * TILE_SIZE_X, (curDx + 1) * TILE_SIZE_Y + x * TILE_SIZE_Y, TILE_SIZE_X, TILE_SIZE_Y);
                        else
                            tileRect = new Rectangle((curDx + 1) * TILE_SIZE_X + x * TILE_SIZE_X, curDy * TILE_SIZE_Y + y * TILE_SIZE_Y, TILE_SIZE_X, TILE_SIZE_Y);

                        if ((visibleRect.Contains(tileRect)) || (visibleRect.IntersectsWith(tileRect)))
                        {
                            if ((index!=-1) && (index < bigBlocks.Images.Count))
                                g.DrawImage(bigBlocks.Images[index], tileRect);
                        }
                    }
                }
            }
        }