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41 package java2d.demos.Arcs_Curves;
42
43 import java.awt.*;
44 import java.awt.geom.Ellipse2D  ;
45 import java.awt.geom.Rectangle2D ;
46 import java.awt.geom.QuadCurve2D ;
47 import java.awt.geom.CubicCurve2D ;
48 import java.awt.geom.PathIterator ;
49 import java.awt.geom.FlatteningPathIterator ;
50 import java.awt.font.TextLayout ;
51 import java.awt.font.FontRenderContext ;
52 import java2d.Surface;
53
54 import static java.awt.Color .*;
55 import static java.awt.geom.PathIterator .*;
56
57
58
61 public class Curves extends Surface {
62
63 private static Color colors[] = { BLUE, GREEN, RED };
64
65 public Curves() {
66 setBackground(WHITE);
67 }
68
69
70 public void render(int w, int h, Graphics2D g2) {
71
72 int y = 0;
73 g2.setColor(BLACK);
74 FontRenderContext frc = g2.getFontRenderContext();
75 TextLayout tl = new TextLayout ("QuadCurve2D", g2.getFont(), frc);
76 float xx = (float) (w*.5-tl.getBounds().getWidth()/2);
77 tl.draw(g2, xx, tl.getAscent());
78
79 tl = new TextLayout ("CubicCurve2D", g2.getFont(), frc);
80 xx = (float) (w*.5-tl.getBounds().getWidth()/2);
81 tl.draw(g2, xx, h*.5f);
82 g2.setStroke(new BasicStroke(5.0f));
83
84 float yy = 20;
85
86 for (int i = 0; i < 2; i++) {
87 for (int j = 0; j < 3; j++) {
88 Shape shape = null;
89
90 if (i == 0) {
91 shape = new QuadCurve2D.Float (w*.1f,yy,w*.5f,50,w*.9f,yy);
92 } else {
93 shape = new CubicCurve2D.Float (w*.1f,yy,w*.4f,yy-15,
94 w*.6f,yy+15,w*.9f,yy);
95 }
96 g2.setColor(colors[j]);
97 if (j != 2)
98 g2.draw(shape);
99
100 if (j == 1 ) {
101 g2.setColor(LIGHT_GRAY);
102 PathIterator f = shape.getPathIterator(null);
103 while ( !f.isDone() ) {
104 float[] pts = new float[6];
105 switch ( f.currentSegment(pts) ) {
106 case SEG_MOVETO:
107 case SEG_LINETO:
108 g2.fill(new Rectangle2D.Float (pts[0], pts[1], 5, 5));
109 break;
110 case SEG_CUBICTO:
111 case SEG_QUADTO:
112 g2.fill(new Rectangle2D.Float (pts[0], pts[1], 5, 5));
113 if (pts[2] != 0) {
114 g2.fill(new Rectangle2D.Float (pts[2], pts[3], 5, 5));
115 }
116 if (pts[4] != 0) {
117 g2.fill(new Rectangle2D.Float (pts[4], pts[5], 5, 5));
118 }
119 }
120 f.next();
121 }
122 } else if (j == 2) {
123 PathIterator p = shape.getPathIterator(null);
124 FlatteningPathIterator f = new FlatteningPathIterator (p,0.1);
125 while ( !f.isDone() ) {
126 float[] pts = new float[6];
127 switch ( f.currentSegment(pts) ) {
128 case SEG_MOVETO:
129 case SEG_LINETO:
130 g2.fill(new Ellipse2D.Float (pts[0], pts[1],3,3));
131 }
132 f.next();
133 }
134 }
135 yy += h/6;
136 }
137 yy = h/2+15;
138 }
139 }
140
141
142 public static void main(String argv[]) {
143 createDemoFrame(new Curves());
144 }
145 }
146 |
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