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Annotation of mstools/samples/wxform/readme, revision 1.1.1.1

1.1       root        1: Sample: World Coordinate Transformation
                      2: 
                      3: Summary:
                      4: 
                      5: The SDK sample named WXFORM provides a demonstration of the
                      6: new world-coordinate transformation. This sample displays a
                      7: rectangle in world coordinates and a matrix containing the
                      8: transform values. Users can directly manipulate the
                      9: rectangle and see the effect on the transformation, or they
                     10: can set the transformation and see the effect on the
                     11: rectangle.
                     12: 
                     13: More Information:
                     14: 
                     15: The program begins by setting the viewport origin to the
                     16: center of the client area. It then draws a rectangle in
                     17: world coordinate space from the point (0, 0) to the point
                     18: (100, 100). The user can directly manipulate this rectangle
                     19: by using the left and right mouse buttons. Specific actions
                     20: are described more fully in the "Direct Manipulation Help"
                     21: dialog box.
                     22: 
                     23: There is a second dialog box titled "World Transform." This
                     24: shows the values of the eM11, eM12, eM21, eM22, eDx, and eDy
                     25: fields in the XFORM structure retrieved by calling the
                     26: GetWorldTransform function. By choosing the buttons on this
                     27: dialog box, the user can cause a SetWorldTransform to occur
                     28: in the program.
                     29: 
                     30: There are three coordinate systems of interest in this
                     31: sample. The first one is the world coordinate system, which
                     32: is new to Win32. These points are ultimately mapped to the
                     33: second coordinate system, device coordinates, before being
                     34: painted in the window. This program must also use a third
                     35: coordinate system, screen coordinates, for certain
                     36: interactions with the mouse pointer.
                     37: 
                     38: There is a third dialog box titled "Mouse Position" that
                     39: shows the location of the cursor in all three of these
                     40: coordinate systems. The device coordinates are relative to
                     41: the upper-left corner of the client area. They are not
                     42: relative to the viewport origin.
                     43: 
                     44: The following is a list of the Win32 API functions used in
                     45: this sample:
                     46: 
                     47:    BeginPaint      GetDC             LocalFree        SelectObject
                     48:    ClientToScreen  GetDlgItemtext    LocalHandle      SendMessage
                     49:    CreateDialog    GetMessage        LPtoDP           SetCapture
                     50:    CreatePen       GetStockObject    ModifyWorldTransform  SetClassLong
                     51:    CreateWindow    GetViewportOrgEx  MoveToEx         SetCursorPos
                     52:    DeleteObject    GetWorldTransform OffsetRect       SetDlgItemText
                     53:    DispatchMessage InvalidateRect    PostQuitMessage  SetROP2
                     54:    DPtoLP          LineTo            PtInRect         SetViewportOrgEx
                     55:    EndPaint        LoadCursor        Rectangle        SetWorldTransform
                     56:    GetClassLong    LoadIcon          ReleaseCapture   ShowWindow
                     57:    GetClientRect   LocalAlloc        ReleaseDC        TranslateMessage
                     58:                                                       UpdateWindow
                     59: 
                     60: 

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