mtInertia.Picture.TransformImage C# (CSharp) Method

        private Bitmap TransformImage()
        {
            //Get the scale & rotate transform matrix
            Matrix matrix = GetTrasformationMatrix();

            //Get an array of the bitmap boundaries after the matrix transformation
            PointF[] bitmapRect = GetBitmapBoundary(matrix);

            float minX = FindMinX(bitmapRect);
            float minY = FindMinY(bitmapRect);
            float maxX = FindMaxX(bitmapRect);
            float maxY = FindMaxY(bitmapRect);
            
            RectangleF boundRect = new RectangleF(
                0, 0, Math.Abs(maxX - minX), Math.Abs(maxY - minY));

            //create a new empty bitmap to hold rotated image
            Bitmap transformedBitmap = new Bitmap((int)boundRect.Width, (int)boundRect.Height);

            //make a graphics object from the empty bitmap
            Graphics g = Graphics.FromImage(transformedBitmap);

            g.TranslateTransform(-minX, -minY);

            //For debugging:
            //g.FillRectangle(Brushes.Azure, g.VisibleClipBounds);
            //g.DrawPolygon(new Pen(Color.Red, 10), bitmapRect);          
            
            g.MultiplyTransform(matrix);

            //draw the image onto transformed graphics
            g.DrawImage(_bitmap, new PointF(0,0));
            
            return transformedBitmap; 
        }