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mvMapScalePlugin.pas
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The TMapScalePlugin draws a scale bar in the map the indicate the current
zoom magnification. The scale bar is labeled by its length in real-world units.
Note that due to the projection of the earth onto a plane the magnficiation
factor depends on the latitude. In particular at low zoom levels, the magnification
can vary betwen the top and bottom of the displayed map.
Properties
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AlignSet: TScaleAlignSet
a set of alignment values (alLeft, alTop, alRight, alBottom) determining the
map edge at which the scale bar is positioned.
Including both alLeft and alTop centers the bar horizontally,
including alTop and alBottom centers it vertically.
Imperial: Boolean
Allows to switch between metric (km, m) and imperial (miles, feet) length
units
SpaceX: Integer
Distance of the scale bar from the left or right side of the map
SpaceY: Integer
Distance of the scale bar from the top or bottom side of the map
WidthMax: Integer
Determines the maximum width of the scale bar. The width, however, usually
is reduced so that the length label has a "nice" value.
ZoomMin: Integer
Mininum zoom level at which or above which the scale bar is displayed. When
the current zoom level is smaller than this limit the bar is hidden because
the magnfication varies noticeably across the map due to the map projection
BackgroundColor: TColor
Background color of the scale bar. The background is transparent for the
color clNone, or when the BackgroundOpacity is 0
BackgroundOpacity: single
Determines the transparency of the background of the scale bar.
The value can range between 0 (fully transparent) and 1 (fully opaque).
Font: TFont
Determines the font used for the length label of the scale bar
Pen: TPen
Determines the color, width and style of the scale bar line
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