Problem in Stretching the Drawn image

[kingslee]

Dear Friends,
I am doing a project - in which i have an array of points world coordinates. Using that I Draw the image using SetPixel(). After that using rectangle tool in the menu, User select on the image to get the coordinates, on which the measurement should take place

The problem is now I wanna increase the image size ,like increasing the individual pixel size or increasing the scaling factor in a Graph.

For your kind view, I attach the project here.(visual c++ 6.0)

Please help me in this regard.

cheers
kingsly