jas.graph
Class ArrowComputer

java.lang.Object
  jas.graph.ArrowComputer

public class ArrowComputer
extends java.lang.Object

ArrowComputer computes the vertexes of a triangle, in order to paint the arrow cap of a line.

Title: JAS

Description: Java Agent-based Simulation library

Copyright (C) 2002 Michele Sonnessa

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

Author:

Michele Sonnessa

Field Summary

static int	LEFT
static int	RIGHT
static int	STING

Constructor Summary

ArrowComputer()
Set the arrow height to 25 pixels and the arrow width to 6.

ArrowComputer(int arrowHeight, int arrowWidth)
Set the arrow dimension to the given parameters

Method Summary

void	calculateBasisVertexes(int x1, int y1, int x2, int y2, int distance) This method is used to compute the starting point of a line connecting two points, shifted to the left of the given distance.
void	calculateVertexes(int x1, int y1, int x2, int y2) Calculate vertexes of the triangle representing the arrow cap of an arrow.
int[]	getXValues() Return an array of x coords as results of the computation
int[]	getYValues() Return an array of y coords as results of the computation

Methods inherited from class java.lang.Object

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

Field Detail

LEFT

public static final int LEFT

See Also:

Constant Field Values

RIGHT

public static final int RIGHT

See Also:

Constant Field Values

STING

public static final int STING

See Also:

Constant Field Values

Constructor Detail

ArrowComputer

public ArrowComputer()

Set the arrow height to 25 pixels and the arrow width to 6.

ArrowComputer

public ArrowComputer(int arrowHeight,
                     int arrowWidth)

Set the arrow dimension to the given parameters

Parameters:

arrowHeight - The height of the arrow cap

arrowWidth - The base width of the arrow cap

Method Detail

calculateBasisVertexes

public void calculateBasisVertexes(int x1,
                                   int y1,
                                   int x2,
                                   int y2,
                                   int distance)

This method is used to compute the starting point of a line connecting two points, shifted to the left of the given distance. The result of this operation is stored at the LEFT index of the xValues, yValues arrays.

Parameters:

x1 - The x coord of the starting point

y1 - The y coord of the starting point

x2 - The x coord of the ending point

y2 - The y coord of the ending point

distance - The distance of the starting point

calculateVertexes

public void calculateVertexes(int x1,
                              int y1,
                              int x2,
                              int y2)

Calculate vertexes of the triangle representing the arrow cap of an arrow.

Parameters:

x1 - The x coord of the starting point

y1 - The y coord of the starting point

x2 - The x coord of the ending point

y2 - The y coord of the ending point

getXValues

public int[] getXValues()

Return an array of x coords as results of the computation

Returns:

An array of 3 integers indexed with the STING, LEFT and RIGHT constants.

getYValues

public int[] getYValues()

Return an array of y coords as results of the computation

Returns:

An array of 3 integers indexed with the STING, LEFT and RIGHT constants.