AForge.Imaging.DocumentSkewChecker.InitHoughMap C# (CSharp) Method

        private void InitHoughMap( )
        {
            if ( needToInitialize )
            {
                needToInitialize = false;

                houghHeight = (int) ( 2 * maxSkewToDetect * stepsPerDegree );
                thetaStep = ( 2 * maxSkewToDetect * Math.PI / 180 ) / houghHeight;

                // precalculate Sine and Cosine values
                sinMap = new double[houghHeight];
                cosMap = new double[houghHeight];

                double minTheta = 90.0 - maxSkewToDetect;

                for ( int i = 0; i < houghHeight; i++ )
                {
                    sinMap[i] = Math.Sin( ( minTheta * Math.PI / 180 ) + ( i * thetaStep ) );
                    cosMap[i] = Math.Cos( ( minTheta * Math.PI / 180 ) + ( i * thetaStep ) );
                }
            }
        }
    }