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Annotation of 43BSD/contrib/X/doc/Xlib/ch03b.t, revision 1.1

1.1     ! root        1: .NH 2
        !             2: Display Coordinate System
        !             3: .XS
        !             4: Display Coordinate system
        !             5: .XE
        !             6: .PP
        !             7: .IN "Definitions" "Coordinate System"
        !             8: .IN "Definitions" "X Axis"
        !             9: .IN "Definitions" "Y Axis"
        !            10: As with most bitmap display systems, the coordinate system is
        !            11: different from a cartesian coordinate system.
        !            12: X and y coordinate systems are measured in pixels from
        !            13: the UPPER LEFT corner of the screen or window.
        !            14: .PP
        !            15: This means that while the X coordinate behaves as one might expect,
        !            16: the Y coordinate increases DOWN the screen.
        !            17: .PP
        !            18: .IN "Definitions" "Window Size"
        !            19: When you specify the size of a window in X, it is the size of the
        !            20: usable pixels inside the border.
        !            21: .PP
        !            22: X always measures window size in pixels EXCLUSIVE of borders, from the
        !            23: upper left hand corner.
        !            24: This is the actual usable size of the window.
        !            25: .PP
        !            26: If you query the root window, you can determine the absolute size of the 
        !            27: display.

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