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Annotation of q_a/samples/world/readme.txt, revision 1.1

1.1     ! root        1: Sample: World Coordinate Transforms
        !             2: 
        !             3: 
        !             4: Summary:
        !             5: 
        !             6: The WORLD sample demonstrates how an image can be translated and scaled
        !             7: using SetWorldTransform(). The image is read from the metafile.
        !             8: 
        !             9: After the application is started, go to the Metafile menu and select
        !            10: "Open" in order to specify the metafile which should be used. The image
        !            11: is displayed and the horizontal and vertical thumbs are set to the
        !            12: middle of the scrollbars. Use the scrollbars to translate the image. In
        !            13: order to scale the image, choose the Scale menu option. Select the
        !            14: desired horizontal and vertical scaling factors from the listboxes.
        !            15: 
        !            16: 
        !            17: More Information:
        !            18: 
        !            19: The sample metafile, SAMPLE.EMF, was created using the code from the
        !            20: Overviews manual, in Chapter 74: Metafiles. PlayEnhMetafile() is used
        !            21: in the WM_PAINT case to display the image stored in the metafile.
        !            22: 
        !            23: SetWorldTransform() takes two parameters: a device context and a
        !            24: structure which defines the transform to be applied. The transform
        !            25: contains 6 fields, which have the following use in this program:
        !            26: 
        !            27:    eM11  :  Horizontal Scaling Factor
        !            28:    eM12  :  Not Used
        !            29:    eM21  :  Not Used
        !            30:    eM22  :  Vertical Scaling Factor
        !            31:    eDx   :  Horizontal Translation
        !            32:    eDy   :  Vertical Translation
        !            33: 
        !            34: The WM_HSCROLL and WM_VSCROLL cases are handled pretty much as they
        !            35: are in any of the other samples, except that ScrollWindow() is not used
        !            36: to update the window contents. Instead, the appropriate modification is
        !            37: made to the transform and InvalidateRect() is called to update the
        !            38: window.
        !            39: 
        !            40: When the OK button is selected in the Scale Image dialog, the transform
        !            41: is updated and InvalidRect() is called to update the window.
        !            42: 

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