CrossStitchCreator.PatternEditor.pictureBox_MouseUp C# (CSharp) Method

        private void pictureBox_MouseUp(object sender, MouseEventArgs e)
        {
            if (drawing > 0)
            {
                int x = (int)((float)e.X * (float)PATTERN_WIDTH / (float)pictureBox.Width);
                int y = (int)((float)e.Y * (float)PATTERN_WIDTH / (float)pictureBox.Height);
                if (x >= 0 && x < PATTERN_WIDTH && y >= 0 && y < PATTERN_WIDTH)
                {
                    if (drawing == 1) mCurrentImage.SetPixel(x, y, Color.Black);
                    else if (drawing == 2) mCurrentImage.SetPixel(x, y, Color.White);
                    setImage(mCurrentImage);
                }
            }
            drawing = 0;
        }