Call SetScaleToFitSize when you want to scale the viewport size to the current window size automatically.
The horizontal and vertical sizes to which the view is to be scaled. The scroll view's size is measured in logical units. The horizontal size is contained in the cx member. The vertical size is contained in the cy member. Both cx and cy must be greater than or equal to 0.
With scroll bars, only a portion of the logical view may be visible at any time. But with the scale-to-fit capability, the view has no scroll bars and the logical view is stretched or shrunk to exactly fit the window's client area. When the window is resized, the view draws its data at a new scale based on the size of the window.
You'll typically place the call to SetScaleToFitSize in your override of the view's OnInitialUpdate member function. If you do not want automatic scaling, call the SetScrollSizes member function instead.
SetScaleToFitSize can be used to implement a "Zoom to Fit" operation. Use SetScrollSizes to reinitialize scrolling.
SetScaleToFitSize assumes that the size of the view window has been set. If the view window size has not been set when SetScaleToFitSize is called, you will get an assertion. To ensure that this does not happen, make the following call before calling SetScaleToFitSize: