org.deegree_impl.graphics.displayelements
Class CurveWalker

java.lang.Object
  org.deegree_impl.graphics.displayelements.CurveWalker

public class CurveWalker

extends java.lang.Object

Walks along the given GM_Curve and generates positions on the line string in regular intervals (i.e. with the same distance).

Version:

$Revision: 1.2 $ $Date: 2004/05/14 07:45:44 $

Author:

Field Summary

private int	maxX
private int	maxY
private int	minX
private int	minY

Constructor Summary

CurveWalker(java.awt.Rectangle bounds)

Method Summary

double[]	calcDeviation(int[] start, int[] end, java.util.List points) Calculates the maximum deviation that points on a linestring have to the ideal line between the starting point and the end point.
java.util.ArrayList	createPositions(int[][] pos, double width) Determines positions on the given GM_Curve where a caption could be drawn.
static int[]	findPointWithDistance(int[] p0, int[] p1, int[] p2, int d) Finds a point on the line between p1 and p2 that has a certain distance from point p0 (provided that there is such a point).
double	getDistance(double x1, double y1, double x2, double y2)
double	getDistance(int[] p1, int[] p2)
double	getRotation(double x1, double y1, double x2, double y2)

Methods inherited from class java.lang.Object

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

Field Detail

minX

private int minX

minY

private int minY

maxX

private int maxX

maxY

private int maxY

Constructor Detail

CurveWalker

public CurveWalker(java.awt.Rectangle bounds)

Method Detail

createPositions

public java.util.ArrayList createPositions(int[][] pos,
                                           double width)

Determines positions on the given GM_Curve where a caption could be drawn. For each of this positons, three candidates are produced; one on the line, one above of it and one below.

Parameters:

pos -

Returns:

ArrayList containing Arrays of Label-objects

calcDeviation

public double[] calcDeviation(int[] start,
                              int[] end,
                              java.util.List points)

Calculates the maximum deviation that points on a linestring have to the ideal line between the starting point and the end point.

The ideal line is thought to be running from left to right, the left deviation value generally is above the line, the right value is below.

Parameters:

start - starting point of the linestring

end - end point of the linestring

points - points in between

Returns:

findPointWithDistance

public static int[] findPointWithDistance(int[] p0,
                                          int[] p1,
                                          int[] p2,
                                          int d)

Finds a point on the line between p1 and p2 that has a certain distance from point p0 (provided that there is such a point).

Parameters:

p0 - point that is used as reference point for the distance

p1 - starting point of the line

p2 - end point of the line

d - distance

Returns:

getRotation

public double getRotation(double x1,
                          double y1,
                          double x2,
                          double y2)

getDistance

public double getDistance(int[] p1,
                          int[] p2)

getDistance

public double getDistance(double x1,
                          double y1,
                          double x2,
                          double y2)