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41 package java2d.demos.Images;
42
43 import java.awt.*;
44 import java.awt.geom.CubicCurve2D  ;
45 import java.awt.geom.Point2D ;
46 import java.awt.geom.FlatteningPathIterator ;
47 import java.awt.geom.PathIterator ;
48 import java2d.AnimatingSurface;
49
50
51
54 public class WarpImage extends AnimatingSurface {
55
56 private static int iw, ih, iw2, ih2;
57 private static Image img;
58 private static final int FORWARD = 0;
59 private static final int BACK = 1;
60 private Point2D pts[];
61 private int direction = FORWARD;
62 private int pNum;
63 private int x, y;
64
65
66 public WarpImage() {
67 setBackground(Color.white);
68 img = getImage("surfing.gif");
69 iw = img.getWidth(this);
70 ih = img.getHeight(this);
71 iw2 = iw/2;
72 ih2 = ih/2;
73 }
74
75
76 public void reset(int w, int h) {
77 pNum = 0;
78 direction = FORWARD;
79 CubicCurve2D cc = new CubicCurve2D.Float (
80 w*.2f, h*.5f, w*.4f,0, w*.6f,h,w*.8f,h*.5f);
81 PathIterator pi = cc.getPathIterator(null, 0.1);
82 Point2D tmp[] = new Point2D [200];
83 int i = 0;
84 while ( !pi.isDone() ) {
85 float[] coords = new float[6];
86 switch ( pi.currentSegment(coords) ) {
87 case PathIterator.SEG_MOVETO:
88 case PathIterator.SEG_LINETO:
89 tmp[i] = new Point2D.Float (coords[0], coords[1]);
90 }
91 i++;
92 pi.next();
93 }
94 pts = new Point2D [i];
95 System.arraycopy(tmp,0,pts,0,i);
96 }
97
98
99 public void step(int w, int h) {
100 if (pts == null) {
101 return;
102 }
103 x = (int) pts[pNum].getX();
104 y = (int) pts[pNum].getY();
105 if (direction == FORWARD)
106 if (++pNum == pts.length)
107 direction = BACK;
108 if (direction == BACK)
109 if (--pNum == 0)
110 direction = FORWARD;
111 }
112
113
114 public void render(int w, int h, Graphics2D g2) {
115 g2.drawImage(img,
116 0, 0, x, y,
117 0, 0, iw2, ih2,
118 this);
119 g2.drawImage(img,
120 x, 0, w, y,
121 iw2, 0, iw, ih2,
122 this);
123 g2.drawImage(img,
124 0, y, x, h,
125 0, ih2, iw2, ih,
126 this);
127 g2.drawImage(img,
128 x, y, w, h,
129 iw2, ih2, iw, ih,
130 this);
131 }
132
133
134 public static void main(String argv[]) {
135 createDemoFrame(new WarpImage());
136 }
137 }
138 |
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