|
01 package examples.spritetest;
02
03 import java.awt.geom.*;
04
05 import fang.Sprite;
06 /**
07 * Demonstrates the use of GeneralPath
08 * to make a geometric shape. The shape
09 * made in this sprite is a star.
10 * @author Jam Jenkins
11 */
12 public class StarSprite extends Sprite
13 {
14 /**
15 * makes a symmetric star
16 * @param points the number of points
17 * @param innerRadius how far in to go for
18 * the non-point vertexes. 1 is all the way
19 * out and will result in a polygon. 0 is all
20 * the way in and will result in invisible
21 * lines for the points.
22 */
23 public StarSprite(int points, double innerRadius)
24 {
25 super();
26 double radius;
27 GeneralPath path=new GeneralPath();
28 int i=0;
29 double angle=i/(points*2.0)*Math.PI*2+1.5*Math.PI;
30 radius=1;
31 float x=(float)(Math.cos(angle)*radius);
32 float y=(float)(Math.sin(angle)*radius);
33 path.moveTo(x, y);
34 for(i=1; i<points*2; i++)
35 {
36 angle=i/(points*2.0)*Math.PI*2+1.5*Math.PI;
37 if(i%2==0)
38 radius=1;
39 else
40 radius=innerRadius;
41 x=(float)(Math.cos(angle)*radius);
42 y=(float)(Math.sin(angle)*radius);
43 path.lineTo(x, y);
44 }
45 path.closePath();
46 setShape(path);
47 }
48
49 }
|
