1    package bookExamples.ch26Graphics.draw2d; 
2     
3     
4    public class Ray2d { 
5        Vec2d p; // origin 
6        Vec2d d; // direction 
7        int count; 
8        double t = 0; 
9        Paintable object; 
10    
11       Vec2d vecOnLine(double _t) { 
12           t = _t; 
13           return d.linearComb(t, p); 
14       } 
15    
16       public Ray2d(Line2d l) { 
17           count = 0; 
18           p = new Vec2d(l.x1, l.y1); 
19           d = new Vec2d(l.x2 - l.x1, l.y2 - l.y1); 
20           d.normalize(); 
21       } 
22    
23       public Ray2d(Vec2d _p, Vec2d _d) { 
24           p = new Vec2d(_p); 
25           d = new Vec2d(_d); 
26       } 
27    
28       public String toString() { 
29           return "Origin=" + p + "\ndirection=" + d; 
30       } 
31   } 
32    
33