drawables
Class DrawablePolygon

java.lang.Object
  |
  +--drawables.Drawable
        |
        +--drawables.FilledDrawable
              |
              +--drawables.DrawablePolygon

All Implemented Interfaces:

EntryReadable, java.io.Serializable

Direct Known Subclasses:

DrawablePolyline

public class DrawablePolygon

extends FilledDrawable

Class for drawable polygons.

See Also:

Serialized Form

Field Summary

protected int	num Number of coordinates.
protected int[]	outX Output buffer for x-coordinates.
protected int[]	outY Output buffer for y-coordinates.
protected int[]	xCoords x-coordinates.
protected int[]	yCoords y-coordinates.

Fields inherited from class drawables.FilledDrawable

filled

Fields inherited from class drawables.Drawable

AREALAYER, BITMAPLAYER, container, DEFMAXSCALE, DEFMINSCALE, layer, LINELAYER, maxScale, mbr, minScale, nextOfLayer, obj, POINTLAYER, pres, selected, TEXTLAYER

Constructor Summary

DrawablePolygon()
Constructor.

DrawablePolygon(int npoints, int[] xpoints, int[] ypoints)
Constructor for non-filled polygons with holes.

DrawablePolygon(int npoints, int[] xpoints, int[] ypoints, boolean filled, java.lang.String presName)
Constructor for polygons.

DrawablePolygon(int npoints, int[] xpoints, int[] ypoints, boolean filled, java.lang.String presName, int minScale, int maxScale)
Constructor for polygons.

Method Summary

static java.awt.Rectangle	computeMBR(int num, int[] xCoords, int[] yCoords) Computes the minimum bounding box for coordinate arrays.
protected void	drawProtected(java.awt.Graphics g, int scale, int mode, int value) Draws the polygon using a given GraphicContext, if the scale is observed.
int	getNumberOfPoints() Returns the number of points.
EntryReadable	read(java.io.DataInputStream r) Reads the polygon from the data input stream.
EntryReadable	read(EntryInput r) Reads the polygon from the EntryInput.
void	write(java.io.DataOutputStream out, int type) Writes the polygon to the data output stream.
void	writeGML(EntryWriter out) Writes the primitive as GML tag.
protected void	writeProtected(EntryWriter out, int type) Writes the polygon to the EntryWriter.

Methods inherited from class drawables.FilledDrawable

isFilled, setFilling

Methods inherited from class drawables.Drawable

computeDistance, computeDistanceTo, contains, draw, draw, draw, draw, getContainer, getId, getLayer, getMaxScale, getMBR, getMinScale, getNextOfLayer, getObject, getPresentation, getPresentation, getType, interacts, intersects, intersects, intersects, isContainedBy, isVisible, readCoord, readCoord, readDrawable, readDrawable, setContainer, setLayer, setMaxScale, setMBR, setMinScale, setNextOfLayer, setObject, setPresentation, setSelection, toString, write, writeCoord, writeCoord

Methods inherited from class java.lang.Object

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

Field Detail

xCoords

protected int[] xCoords

x-coordinates.

yCoords

protected int[] yCoords

y-coordinates.

num

protected int num

Number of coordinates.

outX

protected int[] outX

Output buffer for x-coordinates.

outY

protected int[] outY

Output buffer for y-coordinates.

Constructor Detail

DrawablePolygon

public DrawablePolygon()

Constructor.

DrawablePolygon

public DrawablePolygon(int npoints,
                       int[] xpoints,
                       int[] ypoints)

Constructor for non-filled polygons with holes.

Parameters:

npoints - number of points

xpoints - x-coordinates (will not be duplicated!)

ypoints - y-coordinaten (will not be duplicated!)

DrawablePolygon

public DrawablePolygon(int npoints,
                       int[] xpoints,
                       int[] ypoints,
                       boolean filled,
                       java.lang.String presName)

Constructor for polygons.

Parameters:

npoints - number of points

xpoints - x-coordinates (will not be duplicated!)

ypoints - y-coordinaten (will not be duplicated!)

filled - polygon filled?

presName - name of the presentation object

DrawablePolygon

public DrawablePolygon(int npoints,
                       int[] xpoints,
                       int[] ypoints,
                       boolean filled,
                       java.lang.String presName,
                       int minScale,
                       int maxScale)

Constructor for polygons.

Parameters:

npoints - number of points

xpoints - x-coordinates (will not be duplicated!)

ypoints - y-coordinaten (will not be duplicated!)

filled - polygon filled?

presName - name of the presentation object

minScale - least detailed scale where the drawable is visible

maxScale - most detailed scale where the drawable is visible

Method Detail

computeMBR

public static java.awt.Rectangle computeMBR(int num,
                                            int[] xCoords,
                                            int[] yCoords)

Computes the minimum bounding box for coordinate arrays.

Parameters:

num - number of points

xCoords - x-coordinates

yCoords - y-coordinates

Returns:

the mbr

drawProtected

protected void drawProtected(java.awt.Graphics g,
                             int scale,
                             int mode,
                             int value)

Draws the polygon using a given GraphicContext, if the scale is observed.

Specified by:

drawProtected in class Drawable

Parameters:

g - graphical context

scale - actual scale

mode - actual mode

value - presentation value

getNumberOfPoints

public int getNumberOfPoints()

Returns the number of points.

Returns:

number of points

read

public EntryReadable read(java.io.DataInputStream r)
                   throws java.io.IOException

Reads the polygon from the data input stream. The first entry is the "type".
type == 0: num,xCoords/yCoords
type == 1: filled,presName
type == 2: minScale,maxScale type == 3: layer

Parameters:

r - data input stream

Returns:

this

java.io.IOException

read

public EntryReadable read(EntryInput r)

Reads the polygon from the EntryInput. First entry is the "type".
type == 0: num,xCoords/yCoords
type == 1: filled,presName
type == 2: minScale,maxScale type == 3: layer

Parameters:

r - EntryInput

Returns:

this

write

public void write(java.io.DataOutputStream out,
                  int type)

Writes the polygon to the data output stream.

Parameters:

out - data output stream

type - type of the output; meaning see read-operation

writeGML

public void writeGML(EntryWriter out)

Writes the primitive as GML tag.

Overrides:

writeGML in class Drawable

Parameters:

out - entry writer

writeProtected

protected void writeProtected(EntryWriter out,
                              int type)

Writes the polygon to the EntryWriter.

Specified by:

writeProtected in class Drawable

Parameters:

out - entry writer

type - type of the output; meaning see read-operation