001: /* ===========================================================
002: * JFreeChart : a free chart library for the Java(tm) platform
003: * ===========================================================
004: *
005: * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
006: *
007: * Project Info: http://www.jfree.org/jfreechart/index.html
008: *
009: * This library is free software; you can redistribute it and/or modify it
010: * under the terms of the GNU Lesser General Public License as published by
011: * the Free Software Foundation; either version 2.1 of the License, or
012: * (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but
015: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017: * License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022: * USA.
023: *
024: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025: * in the United States and other countries.]
026: *
027: * ----------------
028: * ArrowNeedle.java
029: * ----------------
030: * (C) Copyright 2002-2006, by the Australian Antarctic Division and
031: * Contributors.
032: *
033: * Original Author: Bryan Scott (for the Australian Antarctic Division);
034: * Contributor(s): David Gilbert (for Object Refinery Limited);
035: *
036: * $Id: ArrowNeedle.java,v 1.3.2.3 2006/08/02 10:40:57 mungady Exp $
037: *
038: * Changes:
039: * --------
040: * 25-Sep-2002 : Version 1, contributed by Bryan Scott (DG);
041: * 27-Mar-2003 : Implemented Serializable (DG);
042: * 09-Sep-2003 : Added equals() method (DG);
043: * 08-Jun-2005 : Implemented Cloneable (DG);
044: */
045:
046: package org.jfree.chart.needle;
047:
048: import java.awt.Graphics2D;
049: import java.awt.Shape;
050: import java.awt.geom.GeneralPath;
051: import java.awt.geom.Line2D;
052: import java.awt.geom.Point2D;
053: import java.awt.geom.Rectangle2D;
054: import java.io.Serializable;
055:
056: /**
057: * A needle in the shape of an arrow.
058: */
059: public class ArrowNeedle extends MeterNeedle implements Cloneable,
060: Serializable {
061:
062: /** For serialization. */
063: private static final long serialVersionUID = -5334056511213782357L;
064:
065: /**
066: * A flag controlling whether or not there is an arrow at the top of the
067: * needle.
068: */
069: private boolean isArrowAtTop = true;
070:
071: /**
072: * Constructs a new arrow needle.
073: *
074: * @param isArrowAtTop a flag that controls whether or not there is an
075: * arrow at the top of the needle.
076: */
077: public ArrowNeedle(boolean isArrowAtTop) {
078: this .isArrowAtTop = isArrowAtTop;
079: }
080:
081: /**
082: * Draws the needle.
083: *
084: * @param g2 the graphics device.
085: * @param plotArea the plot area.
086: * @param rotate the rotation point.
087: * @param angle the angle.
088: */
089: protected void drawNeedle(Graphics2D g2, Rectangle2D plotArea,
090: Point2D rotate, double angle) {
091:
092: Line2D shape = new Line2D.Float();
093: Shape d = null;
094:
095: float x = (float) (plotArea.getMinX() + (plotArea.getWidth() / 2));
096: float minY = (float) plotArea.getMinY();
097: float maxY = (float) plotArea.getMaxY();
098: shape.setLine(x, minY, x, maxY);
099:
100: GeneralPath shape1 = new GeneralPath();
101: if (this .isArrowAtTop) {
102: shape1.moveTo(x, minY);
103: minY += 4 * getSize();
104: } else {
105: shape1.moveTo(x, maxY);
106: minY = maxY - 4 * getSize();
107: }
108: shape1.lineTo(x + getSize(), minY);
109: shape1.lineTo(x - getSize(), minY);
110: shape1.closePath();
111:
112: if ((rotate != null) && (angle != 0)) {
113: getTransform().setToRotation(angle, rotate.getX(),
114: rotate.getY());
115: d = getTransform().createTransformedShape(shape);
116: } else {
117: d = shape;
118: }
119: defaultDisplay(g2, d);
120:
121: if ((rotate != null) && (angle != 0)) {
122: d = getTransform().createTransformedShape(shape1);
123: } else {
124: d = shape1;
125: }
126: defaultDisplay(g2, d);
127:
128: }
129:
130: /**
131: * Tests another object for equality with this object.
132: *
133: * @param obj the object to test (<code>null</code> permitted).
134: *
135: * @return A boolean.
136: */
137: public boolean equals(Object obj) {
138: if (obj == this ) {
139: return true;
140: }
141: if (!(obj instanceof ArrowNeedle)) {
142: return false;
143: }
144: if (!super .equals(obj)) {
145: return false;
146: }
147: ArrowNeedle that = (ArrowNeedle) obj;
148: if (this .isArrowAtTop != that.isArrowAtTop) {
149: return false;
150: }
151: return true;
152: }
153:
154: /**
155: * Returns a clone of this needle.
156: *
157: * @return A clone.
158: *
159: * @throws CloneNotSupportedException if the <code>ArrowNeedle</code>
160: * cannot be cloned (in theory, this should not happen).
161: */
162: public Object clone() throws CloneNotSupportedException {
163: return super.clone();
164: }
165:
166: }
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