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Annotation of 43BSD/contrib/X/doc/Xlib/ch03b.t, revision 1.1.1.1

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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