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2.5.23 Screen Control by Mouse 
The display screen handling is done to the mouse with a key.  
 input  Action Remarks
 KEY  Mouse
three planes (X-Y, Y-Z, Z-X).
Wheel ↑↓ Zoom IN/ Zoom OUT Center of display area of present
 Z   Wheel ↑↓  Zoom IN/ Zoom OUT  center of the display area as for the display object center.
 C  Wheel ↑↓   Zoom IN/ Zoom OUT  Piercingly in Cursor and the position is fixed.
 CTRL   Wheel ↑↓  Scroll of direction of the first axis  X-Y=X、Y-Z=Y,Z-X=Z
 SHIFT   Wheel ↑↓ Scroll of direction of the second axis  X-Y=Y、Y-Z=Z,Z-X=X
 Z  Click  The display object center is moved to the display area center.  no display magnification change
 C  Click  The cursor position is moved to the display area center.  no display magnification change
 A  Click  AUTO Zoom
 The display area center and the display magnification are changed.
 S  Click Switch of display range  Each Plane
 Q Click   Switch of display range  ALL Plane
perspective drawing
    Wheel ↑↓   Track up/ Track Down  
CTRL   Wheel ↑↓    Aspect change Spindle center on reference point
 SHIFT  Wheel ↑↓     Aspect change  Spindle center on reference point
 C Click   Reference point specification  
 S  Click  Switch of display range  perspective drawing
 Q Click   Switch of display range All Plane
 X Click  perspective drawing change  XY front
 Y Click    perspective drawing change  YZ front
 Z Click    perspective drawing change  ZX front
 U Click    perspective drawing change  XY Back
 V Click    perspective drawing change  YZ Back
 W Click    perspective drawing change  ZX Back

 
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