Coordinate Transformation of an image using Matrix class C#

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C#

image

I want to transform mouse coordinates by image coordinates, by this code i am getting correct coordinates of image.

Bitmap resizeBitmap = new Bitmap("image.jpg");
Graphics g = Graphics.FromImage(resizeBitmap);

float scaleFactorX = (float)resizewidth / (float)originalwidth;
float scaleFactorY = (float)resizeheight / (float)originalheight;

g.TranslateTransform((float)resizewidth / 2, (float)resizeheight / 2);
g.ScaleTransform(scaleFactorX, scaleFactorY);
g.RotateTransform(angle1);
g.TranslateTransform(-(float)originalwidth / 2, -(float)originalheight / 2);
g.TransformPoints(System.Drawing.Drawing2D.CoordinateSpace.World, System.Drawing.Drawing2D.CoordinateSpace.Device, point);

But i want to know that how can i do the same thing by using matrix class. and i also want to know that what is the use of Rectangle object in transformation. Thanking you all in advance.