KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > openlaszlo > iv > flash > api > shape > CurvedEdgeRecord


1 /*
2  * $Id: CurvedEdgeRecord.java,v 1.2 2002/02/15 23:44:28 skavish Exp $
3  *
4  * ==========================================================================
5  *
6  * The JGenerator Software License, Version 1.0
7  *
8  * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if
22  * any, must include the following acknowlegement:
23  * "This product includes software developed by Dmitry Skavish
24  * (skavish@usa.net, http://www.flashgap.com/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The name "The JGenerator" must not be used to endorse or promote
29  * products derived from this software without prior written permission.
30  * For written permission, please contact skavish@usa.net.
31  *
32  * 5. Products derived from this software may not be called "The JGenerator"
33  * nor may "The JGenerator" appear in their names without prior written
34  * permission of Dmitry Skavish.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
40  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  *
49  */
50
51 package org.openlaszlo.iv.flash.api.shape;
52
53 import org.openlaszlo.iv.flash.util.*;
54 import java.io.PrintStream JavaDoc;
55 import org.openlaszlo.iv.flash.api.*;
56
57 /**
58  * CurveEdge record.
59  * <P>
60  * SWF differs from most vector file formats by using Quadratic Bezier
61  * curves rather than Cubic Bezier curves. PostScript uses Cubic Beziers,
62  * as do most drawing applications, such as Illustrator, FreeHand and Corel Draw.
63  * SWF uses Quadratic Bezier curves because they can be stored more compactly,
64  * and can be rendered more efficiently.
65  * <P>
66  * A Quadratic Bezier curve has 3 points. Two on-curve anchor points, and one off-curve
67  * control point. A Cubic Bezier curve has 4 points. Two on-curve anchor points,
68  * and two off-curve control points.
69  * <P>
70  * The curved-edge record stores the edge as two X-Y deltas.
71  * The three points that define the Quadratic Bezier are calculated like this:
72  * <UL>
73  * <LI>The first anchor point is the current drawing position.
74  * <LI>The control point is the current drawing position + ControlDelta.
75  * <LI>The last anchor point is the current drawing position + ControlDelta + AnchorDelta.
76  * </UL>
77  * The last anchor point becomes the current drawing position.
78  *
79  * @author Dmitry Skavish
80  */
81 public final class CurvedEdgeRecord extends FlashItem {
82
83     private int controlDeltaX;
84     private int controlDeltaY;
85     private int anchorDeltaX;
86     private int anchorDeltaY;
87
88     public CurvedEdgeRecord() {}
89
90     public CurvedEdgeRecord( int controlDeltaX, int controlDeltaY, int anchorDeltaX, int anchorDeltaY ) {
91         setControlDeltaX(controlDeltaX);
92         setControlDeltaY(controlDeltaY);
93         setAnchorDeltaX(anchorDeltaX);
94         setAnchorDeltaY(anchorDeltaY);
95     }
96
97     public int getControlDeltaX() {
98         return controlDeltaX;
99     }
100     public void setControlDeltaX( int controlDeltaX ) {
101         this.controlDeltaX = controlDeltaX;
102     }
103
104     public int getControlDeltaY() {
105         return controlDeltaY;
106     }
107     public void setControlDeltaY( int controlDeltaY ) {
108         this.controlDeltaY = controlDeltaY;
109     }
110
111     public int getAnchorDeltaX() {
112         return anchorDeltaX;
113     }
114     public void setAnchorDeltaX( int anchorDeltaX ) {
115         this.anchorDeltaX = anchorDeltaX;
116     }
117
118     public int getAnchorDeltaY() {
119         return anchorDeltaY;
120     }
121     public void setAnchorDeltaY( int anchorDeltaY ) {
122         this.anchorDeltaY = anchorDeltaY;
123     }
124
125     public void write( FlashOutput fob ) {
126         fob.writeBits(0x2, 2);
127         int nBits = Util.getMinBitsS( Util.getMax(controlDeltaX, controlDeltaY, anchorDeltaX, anchorDeltaY) );
128         if( nBits < 3 ) nBits = 3;
129         fob.writeBits(nBits-2, 4);
130         fob.writeBits(controlDeltaX, nBits);
131         fob.writeBits(controlDeltaY, nBits);
132         fob.writeBits(anchorDeltaX, nBits);
133         fob.writeBits(anchorDeltaY, nBits);
134     }
135
136     public void printContent( PrintStream JavaDoc out, String JavaDoc indent ) {
137         out.println( indent+" curve ("+controlDeltaX+","+controlDeltaY+","+anchorDeltaX+","+anchorDeltaY+")" );
138     }
139
140     protected FlashItem copyInto( FlashItem item, ScriptCopier copier ) {
141         ((CurvedEdgeRecord)item).controlDeltaX = controlDeltaX;
142         ((CurvedEdgeRecord)item).controlDeltaY = controlDeltaY;
143         ((CurvedEdgeRecord)item).anchorDeltaX = anchorDeltaX;
144         ((CurvedEdgeRecord)item).anchorDeltaY = anchorDeltaY;
145         return item;
146     }
147
148     public FlashItem getCopy( ScriptCopier copier ) {
149         return copyInto( new CurvedEdgeRecord(), copier );
150     }
151 }
152
Popular Tags