OMSubtraction (OpenMap API)
Date: 2016-12-09

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## com.bbn.openmap.layer.mif
Class OMSubtraction

    java.lang.Object
      com.bbn.openmap.omGraphics.geom.BasicGeometry
          com.bbn.openmap.omGraphics.OMGraphicAdapter
              com.bbn.openmap.layer.mif.OMSubtraction

All Implemented Interfaces:
  OMGeometry, OMGraphic, OMGraphicConstants, java.io.Serializable, java.lang.Cloneable

    public class OMSubtraction

extends OMGraphicAdapter
implements java.io.Serializable

Defines a Region of a MIF file where when one region encloses another the enclosed region is subtracted from the enclosing region in order to create a hole Computationally this can be expensive to do on a complex layout like a streetmap of city

See Also:
  Serialized Form

Field Summary

Fields inherited from class com.bbn.openmap.omGraphics.OMGraphicAdapter
`declutterType, displayPaint, edgeMatchesFill, fillPaint, hasLabel, linePaint, matted, mattingPaint, renderType, selected, selectPaint, showEditablePalette, stroke, textureMask`

Fields inherited from class com.bbn.openmap.omGraphics.geom.BasicGeometry
`attributes, lineType, needToRegenerate, shape, visible`

Fields inherited from interface com.bbn.openmap.omGraphics.OMGraphicConstants
`ADD_GRAPHIC_MASK, APP_OBJECT, BASIC_STROKE, CHANGE_APPEARANCE, clear, DECIMAL_DEGREES, DECLUTTERTYPE_LINE, DECLUTTERTYPE_MOVE, DECLUTTERTYPE_NONE, DECLUTTERTYPE_SPACE, DEFAULT_ROTATIONANGLE, DELETE_GRAPHIC_MASK, DESELECT_GRAPHIC_MASK, DESELECTALL_GRAPHIC_MASK, GRAPHICTYPE_ARC, GRAPHICTYPE_BITMAP, GRAPHICTYPE_CIRCLE, GRAPHICTYPE_ELLIPSE, GRAPHICTYPE_GRAPHIC, GRAPHICTYPE_GRID, GRAPHICTYPE_LINE, GRAPHICTYPE_POINT, GRAPHICTYPE_POLY, GRAPHICTYPE_RASTER, GRAPHICTYPE_RECTANGLE, GRAPHICTYPE_TEXT, INDEX, INFOLINE, LABEL, LINETYPE_GREATCIRCLE, LINETYPE_RHUMB, LINETYPE_STRAIGHT, LINETYPE_UNKNOWN, LOWER_GRAPHIC_MASK, LOWER_TO_BOTTOM_GRAPHIC_MASK, NO_ROTATE, OMGRAPHIC_ELT, OMGRAPHIC_TYPE_ATTR, RADIANS, RAISE_GRAPHIC_MASK, RAISE_TO_TOP_GRAPHIC_MASK, REMOVABLE, RENDERTYPE_LATLON, RENDERTYPE_OFFSET, RENDERTYPE_UNKNOWN, RENDERTYPE_XY, SELECT_GRAPHIC_MASK, SORT_GRAPHICS_MASK, TOOLTIP, UPDATE_GRAPHIC_MASK, UPDATED`

Constructor Summary
`OMSubtraction(double[] lat, double[] lon)`

Method Summary
`float` | `distance(double x, double y)` Return the shortest distance from the line to an XY-point - not relevant to this class.
`boolean` | `generate(Projection proj)` Prepare the graphic for rendering.
`void` | `render(java.awt.Graphics g)` Paint the graphic.

Methods inherited from class com.bbn.openmap.omGraphics.OMGraphicAdapter
`clone, deselect, getDeclutterType, getDisplayColor, getDisplayPaint, getEdgeMatchesFill, getFillColor, getFillPaint, getHasLabel, getLineColor, getLinePaint, getMattingPaint, getRenderType, getSelectColor, getSelectPaint, getShowEditablePalette, getStroke, getTextureMask, hasLineTypeChoice, initLabelingDuringGenerate, isClear, isMatted, isSelected, normalizeDistanceForLineWidth, readStroke, readTextureMask, regenerate, renderLabel, renderShape, restore, select, setDeclutterType, setEdgeMatchesFill, setFillColor, setFillPaint, setGraphicsColor, setGraphicsForEdge, setGraphicsForFill, setHasLabel, setLabelLocation, setLabelLocation, setLabelLocation, setLabelLocation, setLabelLocation, setLabelLocation, setLabelLocation, setLabelLocation, setLineColor, setLinePaint, setMatted, setMattingPaint, setRenderType, setSelectColor, setSelected, setSelectPaint, setShowEditablePalette, setStroke, setTextureMask, shouldRenderEdge, shouldRenderFill, writeStroke, writeTextureMask`

Methods inherited from class com.bbn.openmap.omGraphics.geom.BasicGeometry
`_distance, appendShapeEdge, appendShapeEdge, appendShapeEdge, appendShapeEdge, clearAttributes, contains, createAttributeMap, createBoxShape, createShape, createShape, describeShapeDetail, describeShapeDetail, distanceToEdge, distanceToEdge, draw, draw, fill, fill, getAppObject, getAttribute, getAttributes, getDescription, getLineType, getNeedToRegenerate, getShape, isRenderable, isRenderable, isVisible, putAttribute, removeAttribute, setAppObject, setAttributes, setLineType, setNeedToRegenerate, setShape, setVisible`

Methods inherited from class java.lang.Object
`equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface com.bbn.openmap.omGraphics.OMGeometry
`clearAttributes, contains, distanceToEdge, draw, draw, fill, fill, getAppObject, getAttribute, getAttributes, getDescription, getLineType, getNeedToRegenerate, getShape, isRenderable, isRenderable, isVisible, putAttribute, removeAttribute, setAppObject, setAttributes, setLineType, setNeedToRegenerate, setShape, setVisible`

Constructor Detail

### OMSubtraction

    public OMSubtraction(double[] lat,
                         double[] lon)

Method Detail

### generate

    public boolean generate(Projection proj)

  Description copied from class: `OMGraphicAdapter`
  Prepare the graphic for rendering. This must be done before calling `render()`! If a vector graphic has lat-lon components, then we project these vertices into x-y space. For raster graphics we prepare in a different fashion.

  If the generate is unsuccessful, it's usually because of some oversight, (for instance if `proj` is null), and if debugging is enabled, a message may be output to the controlling terminal.

  Specified by:
    `generate` in interface `OMGeometry`
  Specified by:
    `generate` in class `OMGraphicAdapter`
  Parameters:
    `proj` - Projection
  Returns:
    boolean true if successful, false if not.
  See Also:
    `OMGraphicAdapter.regenerate(com.bbn.openmap.proj.Projection)`

### render

    public void render(java.awt.Graphics g)

  Description copied from class: `OMGraphicAdapter`
  Paint the graphic. This paints the graphic into the Graphics context. This is similar to `paint()` function of java.awt.Components. Note that if the graphic has not been generated, it will not be rendered.

  This method used to be abstract, but with the conversion of OMGraphics to internally represent themselves as java.awt.Shape objects, it's a more generic method. If the OMGraphic hasn't been updated to use Shape objects, it should have its own render method.

  Specified by:
    `render` in interface `OMGeometry`
  Overrides:
    `render` in class `OMGraphicAdapter`
  Parameters:
    `g` - Graphics2D context to render into.

### distance

    public float distance(double x,
                          double y)

  Return the shortest distance from the line to an XY-point - not relevant to this class.

  Specified by:
    `distance` in interface `OMGeometry`
  Overrides:
    `distance` in class `OMGraphicAdapter`
  Parameters:
    `x` - X coordinate of the point.
    `y` - Y coordinate fo the point.
  Returns:
    float always zero

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