Package edu.cnu.mdi.mapping

Class MapConstants

java.lang.Object

edu.cnu.mdi.mapping.MapConstants

public final class MapConstants
extends Object

Package-wide constants shared across the MDI mapping subsystem.

Centralizing these values eliminates the duplication bugs that arise when the same magic number is defined independently in multiple classes (e.g., MAX_POP_SLIDER_VALUE previously appeared separately in both MapControlPanel and MapView2D, creating a silent divergence risk).

All fields are public static final. This class is not instantiable.

Field Summary

Fields

Modifier and Type	Field	Description
static final EProjection	DEFAULT_PROJECTION	The default map projection shown when a new MapView2D is created and the projection selected in MapProjectionMenu on first render.
static final int	MIN_POP_DEFAULT	Default value of the minimum-population slider used by MapControlPanel and the initial population threshold applied in MapView2D.setProjection(EProjection).
static final double	RADIUS_EARTH_KM	The mean radius of the Earth in kilometers, used to scale the dimensionless great-circle arc length returned by MapGraphics.greatCircleLength(java.awt.geom.Point2D.Double, java.awt.geom.Point2D.Double) (computed via the spherical law of cosines) into a real-world distance.

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

MIN_POP_DEFAULT

public static final int MIN_POP_DEFAULT

Default value of the minimum-population slider used by MapControlPanel and the initial population threshold applied in MapView2D.setProjection(EProjection).

Cities whose recorded population is below this value are hidden on first render.

See Also:

• Constant Field Values

DEFAULT_PROJECTION

public static final EProjection DEFAULT_PROJECTION

The default map projection shown when a new MapView2D is created and the projection selected in MapProjectionMenu on first render.

Keeping this constant in one place ensures the view and the menu always agree on which projection is initially active.

RADIUS_EARTH_KM

public static final double RADIUS_EARTH_KM

The mean radius of the Earth in kilometers, used to scale the dimensionless great-circle arc length returned by MapGraphics.greatCircleLength(java.awt.geom.Point2D.Double, java.awt.geom.Point2D.Double) (computed via the spherical law of cosines) into a real-world distance.

See Also:

• Constant Field Values