五角星

1. 
   
2. <P>void setup(){
   
3. size(500,500);
   
4. background(255);
   
5. smooth();
   
6. }</P>
   
7. <P>void draw(){
   
8. translate(100,100);
   
9. strokeWeight(2);
   
10. fill(200);
    
11. star(200);</P>
    
12. <P>}</P>
    
13. <P>void star(float R){
    
14. float r = R*sin(radians(18))/cos(radians(36));
    
15. float[] x = new float[11];
    
16. float[] y = new float[11];
    
17. for(int i=0;i<10;i++){
    
18. if(i%2==0){
    
19. x[i] = R*(cos(radians(72*i/2)));
    
20. y[i] = R*(sin(radians(72*i/2)));
    
21. }
    
22. else{
    
23. x[i] = r*(cos(radians(72*i/2)));
    
24. y[i] = r*(sin(radians(72*i/2)));
    
25. }
    
26. }
    
27. x[10] = x[0];
    
28. y[10] = y[0];</P>
    
29. <P>beginShape();
    
30. for(int i=0;i<11;i++){
    
31. vertex(x[i],y[i]);
    
32. }
    
33. endShape();
    
34. }</P>

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