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How do I zoom, pan, or rotate the plot?

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    There are several controls that can be useful for manipulating the plot window. These change your view of the data without affecting the data themselves, and without changing how processing is performed (except the processing required to render the plot window, of course).

    The controls are modelled on those of Google maps.  For those controls which are keystrokes, the plot window must have focus (i.e. be the "current" window, usually shown by a highlighted title bar).
    If your mouse does not have a wheel, it can be simulated using Alt-Up or Alt-Down (the plot window must have focus).

    Name
     Control  Effect on plot window
    set default view
    "=" (Equals key)
    rotate so North is up; pan so the radar is at the centre of the plot window, and set the scale to 5 metres per pixel.  The default rotation and scale can be set by changing the items default.north.angle and default.mpp in the file:
    radR/gui/gui.conf.R
    pan
    drag with left button, then release
    changes the geographic location of the centre of the plot window
    zoom in
    mousewheel up
    or
    Alt-Up
    or
    "-"  (minus key)
    decreases the metres per pixel; zoom is centred on the centre of the plot window
    zoom out
    mousewheel down
    or
    Alt-Down
    or
    "-"  (minus key)
    increases the metres per pixel; zoom is centred on the centre of the plot window
    rotate clockwise
    (coarse)
    Ctrl-mousewheel down (i.e. Ctrl key held down while mouse wheel rolled down)
    or
    Ctrl-Alt-Down
    rotates the display clockwise by 10 pulses (configuration file item: gui/gui.conf.R:plot.big.rotation.increment)
    rotate counterclockwise
    (coarse)
    Ctrl-mousewheel up
    or
    Ctrl-Alt-Up
     rotates the display counterclockwise by 10 pulses
    rotate clockwise
    (fine)
    Ctrl-Shift-mousewheel down
    or
    Ctrl-Shift-Alt-Down
     rotates the display clockwise by 1 pulse
    rotate counter clockwise
    (fine)
     Ctrl-Shift-mousewheel up
    or
    Ctrl-Shift-Alt-up
     rotates the display counterclockwise by 1 pulse
    forward scan
    Shift-mousewheel up
    moves to the next scan in the data source and displays it; this is in "preview" not "play/process" mode, and is equivalent to moving the player slider one notch right
    backward scan Shift-mousewheel down
    moves to the previous scan in the data source and displays it; this is in "preview" not "play/process" mode, and is equivalent to moving the player slider one notch left
    change compass radius
     Ctrl-left button drag
    or
    Ctrl-left button click
    sets the compass radius so that the compass passes through the current mouse location.  This can be set numerically in the display options window
    change range-ring spacing
     Shift-left button drag
    or
    Shift-left button click
    changes the range ring spacing so that the ring closest to the current mouse location is brought directly to the mouse location.


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