Mathematicians should never code alone.

Case in point:

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if (xGrad * yGrad <= (float) 0 /*(1)*/ ? Math.abs(xGrad) >= Math.abs(yGrad) /*(2)*/ ? (tmp = Math.abs(xGrad * gradMag)) >= Math.abs(yGrad * neMag - (xGrad + yGrad) * eMag) /*(3)*/ && tmp > Math.abs(yGrad * swMag - (xGrad + yGrad) * wMag) /*(4)*/ : (tmp = Math.abs(yGrad * gradMag)) >= Math.abs(xGrad * neMag - (yGrad + xGrad) * nMag) /*(3)*/ && tmp > Math.abs(xGrad * swMag - (yGrad + xGrad) * sMag) /*(4)*/ : Math.abs(xGrad) >= Math.abs(yGrad) /*(2)*/ ? (tmp = Math.abs(xGrad * gradMag)) >= Math.abs(yGrad * seMag + (xGrad - yGrad) * eMag) /*(3)*/ && tmp > Math.abs(yGrad * nwMag + (xGrad - yGrad) * wMag) /*(4)*/ : (tmp = Math.abs(yGrad * gradMag)) >= Math.abs(xGrad * seMag + (yGrad - xGrad) * sMag) /*(3)*/ && tmp > Math.abs(xGrad * nwMag + (yGrad - xGrad) * nMag) /*(4)*/ ) { magnitude[index] = gradMag >= MAGNITUDE_LIMIT ? MAGNITUDE_MAX : (int) (MAGNITUDE_SCALE * gradMag); //NOTE: The orientation of the edge is not employed by this //implementation. It is a simple matter to compute it at //this point as: Math.atan2(yGrad, xGrad); } else { magnitude[index] = 0; }