Calculating the angle between two lines without having to calculate the slope? (Java)

by

The atan2 function eases the pain of dealing with atan.

It is declared as double atan2(double y, double x) and converts rectangular coordinates (x,y) to the angle theta from the polar coordinates (r,theta)

So I’d rewrite your code as

public static double angleBetween2Lines(Line2D line1, Line2D line2)
{
    double angle1 = Math.atan2(line1.getY1() - line1.getY2(),
                               line1.getX1() - line1.getX2());
    double angle2 = Math.atan2(line2.getY1() - line2.getY2(),
                               line2.getX1() - line2.getX2());
    return angle1-angle2;
}

More Related Contents:

  1. Fast transcendent / trigonometric functions for Java
  2. Finding Signed Angle Between Vectors
  3. How to rotate a vertex around a certain point?
  4. How to generate Random point(x,y) in Java [closed]
  5. Decrement on While loops
  6. Math.random() explanation
  7. How to test if a double is an integer
  8. Convert latitude/longitude point to a pixels (x,y) on mercator projection
  9. How to round up the result of integer division?
  10. How to find GCD, LCM on a set of numbers
  11. What happens when you increment an integer beyond its max value?
  12. Rounding BigDecimal to *always* have two decimal places
  13. How to draw a decent looking Circle in Java
  14. Why does this subtraction not equal zero?
  15. Java BigDecimal trigonometric methods
  16. Displaying fancy equations with Java [closed]
  17. Polygon Touch detection Google Map API V2
  18. Create the square, rectangle, triangle of java in jframe [closed]
  19. Java check if two rectangles overlap at any point
  20. Java rounding up to an int using Math.ceil
  21. Recursive Fibonacci memoization
  22. Logarithm for BigInteger
  23. pow (x,y) in Java
  24. Calculating the position of points in a circle
  25. Algorithm to generate a hexagonal grid with coordinate system
  26. How do I create an int array with randomly shuffled numbers in a given range [duplicate]
  27. Combinatoric ‘N choose R’ in java math?
  28. Find the max of 3 numbers in Java with different data types
  29. What is the algorithm for finding the center of a circle from three points?
  30. How to Solve Equations with java?

Leave a Comment