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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. namespace ConsoleApplication3
  7. {
  8.  
  9.     class vec
  10.     {
  11.         public double x;
  12.         public double y;
  13.  
  14.         public vec(double x, double y)
  15.         {
  16.             this.x = x;
  17.             this.y = y;
  18.         }
  19.  
  20.         public vec sub(vec vec1) 
  21.         {
  22.             return new vec(this.x - vec1.x, this.y - vec1.y);
  23.         }
  24.  
  25.         public double magnitude()
  26.         {
  27.             return Math.Sqrt((this.x * this.x) + (this.y * this.y));
  28.         }
  29.  
  30.         public vec div(double scalar)
  31.         {
  32.             return new vec(this.x / scalar, this.y / scalar);
  33.         }
  34.  
  35.         public static double dot(vec vec1, vec vec2)
  36.         {
  37.             double ret = (vec1.x * vec2.x) + (vec1.y * vec2.y) ;
  38.             return ret;
  39.         }
  40.     }
  41.  
  42.     class Program
  43.     {
  44.         static void Main(string[] args)
  45.         {
  46.  
  47.             vec ball1pos = new vec(110,90);
  48.             vec ball2pos = new vec(100,100);
  49.             vec difference = ball2pos.sub(ball1pos);
  50.             double distance = difference.magnitude();
  51.             vec normal = difference.div(distance);          // unit vector of pos delta
  52.  
  53.             vec ball1vel = new vec(0, 2);
  54.             vec ball2vel = new vec(0,-3);
  55.             vec velocityDelta = ball2vel.sub(ball1vel);
  56.             double velmag = velocityDelta.magnitude();
  57.             vec velUnit = velocityDelta.div(velmag);        // unit vector of vel delta
  58.  
  59.             double dot = vec.dot(velUnit, normal);          // dot product of unit vectors
  60.   			System.Console.Write(dot);
  61.  
  62.         }
  63.     }
  64. }
  65.  
Success #stdin #stdout 0.03s 33824KB
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-0.707106781186547
https://ideone.com/DhsAoW
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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