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40
41 package java2d.demos.Lines;
42
43 import static java.awt.Color  .*;
44 import java.awt.*;
45 import java.awt.geom.*;
46 import java.awt.font.TextLayout ;
47 import java2d.AnimatingSurface;
48
49
50
53 public class LineAnim extends AnimatingSurface {
54
55 private static int caps[] = { BasicStroke.CAP_BUTT,
56 BasicStroke.CAP_SQUARE, BasicStroke.CAP_ROUND};
57 private static int joins[] = { BasicStroke.JOIN_MITER,
58 BasicStroke.JOIN_BEVEL, BasicStroke.JOIN_ROUND};
59 private static Color colors[] = {GRAY, PINK, LIGHT_GRAY};
60 private static BasicStroke bs1 = new BasicStroke(1.0f);
61 private static final int CLOCKWISE = 0;
62 private static final int COUNTERCW = 1;
63
64 private Line2D lines[] = new Line2D[3];
65 private int rAmt[] = new int[lines.length];
66 private int direction[] = new int[lines.length];
67 private int speed[] = new int[lines.length];
68 private BasicStroke strokes[] = new BasicStroke[lines.length];
69 private GeneralPath path;
70 private Point2D[] pts;
71 private float size;
72 private Ellipse2D ellipse = new Ellipse2D.Double();
73
74
75 public LineAnim() {
76 setBackground(WHITE);
77 }
78
79 public void reset(int w, int h) {
80 size = (w > h) ? h/6f : w/6f;
81 for (int i = 0; i < lines.length; i++) {
82 lines[i] = new Line2D.Float(0,0,size,0);
83 strokes[i] = new BasicStroke(size/3, caps[i], joins[i]);
84 rAmt[i] = i * 360/lines.length;
85 direction[i] = i%2;
86 speed[i] = i + 1;
87 }
88
89 path = new GeneralPath();
90 path.moveTo(size, -size/2);
91 path.lineTo(size+size/2, 0);
92 path.lineTo(size, +size/2);
93
94 ellipse.setFrame(w/2-size*2-4.5f,h/2-size*2-4.5f,size*4,size*4);
95 PathIterator pi = ellipse.getPathIterator(null, 0.9);
96 Point2D[] points = new Point2D[100];
97 int num_pts = 0;
98 while ( !pi.isDone() ) {
99 float[] pt = new float[6];
100 switch ( pi.currentSegment(pt) ) {
101 case FlatteningPathIterator.SEG_MOVETO:
102 case FlatteningPathIterator.SEG_LINETO:
103 points[num_pts] = new Point2D.Float(pt[0], pt[1]);
104 num_pts++;
105 }
106 pi.next();
107 }
108 pts = new Point2D[num_pts];
109 System.arraycopy(points, 0, pts, 0, num_pts);
110 }
111
112
113 public void step(int w, int h) {
114 for (int i = 0; i < lines.length; i++) {
115 if (direction[i] == CLOCKWISE) {
116 rAmt[i] += speed[i];
117 if (rAmt[i] == 360) {
118 rAmt[i] = 0;
119 }
120 } else {
121 rAmt[i] -= speed[i];
122 if (rAmt[i] == 0) {
123 rAmt[i] = 360;
124 }
125 }
126 }
127 }
128
129
130 public void render(int w, int h, Graphics2D g2) {
131
132 ellipse.setFrame(w/2-size,h/2-size,size*2,size*2);
133 g2.setColor(BLACK);
134 g2.draw(ellipse);
135
136 for (int i = 0; i < lines.length; i++) {
137 AffineTransform at = AffineTransform.getTranslateInstance(w/2,h/2);
138 at.rotate(Math.toRadians(rAmt[i]));
139 g2.setStroke(strokes[i]);
140 g2.setColor(colors[i]);
141 g2.draw(at.createTransformedShape(lines[i]));
142 g2.draw(at.createTransformedShape(path));
143
144 int j = (int) ((double) rAmt[i]/360 * pts.length);
145 j = (j == pts.length) ? pts.length-1 : j;
146 ellipse.setFrame(pts[j].getX(), pts[j].getY(), 9, 9);
147 g2.fill(ellipse);
148 }
149
150 g2.setStroke(bs1);
151 g2.setColor(BLACK);
152 for (int i = 0; i < pts.length; i++) {
153 ellipse.setFrame(pts[i].getX(), pts[i].getY(), 9, 9);
154 g2.draw(ellipse);
155 }
156 }
157
158
159 public static void main(String argv[]) {
160 createDemoFrame(new LineAnim());
161 }
162 }
163 |
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