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Angle between two points and x-axis

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23 May 2011CPOL 64.2K   5   2
Calculate angle between two points and the x-axis using C#
Using Math.Atan2 method:

const double Rad2Deg = 180.0 / Math.PI;
const double Deg2Rad = Math.PI / 180.0;

/// <summary>
/// Calculates angle in radians between two points and x-axis.
/// </summary>
private double Angle(Point start, Point end)
    return Math.Atan2(start.Y - end.Y, end.X - start.X) * Rad2Deg;

Pay attention: changing the sign of Y-coordinates causes a transformation of the fourth to the first quadrant because .NET coordinate system is not the same as mathematical ones.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Comments and Discussions

QuestionCalculate angle between two points Pin
Ravi.Kumar02112-Jan-14 6:55
professionalRavi.Kumar02112-Jan-14 6:55 
GeneralUm ... two points define a line. You need three to define an... Pin
Chris Trelawny-Ross23-May-11 9:14
Chris Trelawny-Ross23-May-11 9:14 

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