public void DiagonalLine(int size, short[] points, float expectedC)
{
MockPixelGrid pixelGrid = new MockPixelGrid(size, points);
float a, b, c;
LinearRegression.CalculateLineEquation(pixelGrid, 0, 0, pixelGrid.Width, pixelGrid.Height,
out a, out b, out c);
MathHelper.NormalizeCoefficientsWithRespectToA(ref a, ref b, ref c);
TestHelper.AssertABC(a, b, c, MathHelper.SQRT2DIV2, -MathHelper.SQRT2DIV2, expectedC);
}
public void MiscellaneousLine(int size, short[] points, float exA, float exB, float exC)
{
MockPixelGrid pixelGrid = new MockPixelGrid(size, points);
float a, b, c;
LinearRegression.CalculateLineEquation(pixelGrid, 0, 0, pixelGrid.Width, pixelGrid.Height,
out a, out b, out c);
MathHelper.NormalizeCoefficientsWithRespectToA(ref a, ref b, ref c);
TestHelper.AssertABC(a, b, c, exA, exB, exC);
}
public void SquarePixelPatternGivesIndeterminateLine(int size, short[] points)
{
MockPixelGrid pixelGrid = new MockPixelGrid(size, points);
float a, b, c;
LinearRegression.CalculateLineEquation(pixelGrid, 0, 0, pixelGrid.Width, pixelGrid.Height,
out a, out b, out c);
Assert.IsTrue(float.IsNaN(a), MathHelper.CoeffecientsToString("Expected NaN for a, b and c, but got ", a, b, c));
Assert.IsTrue(float.IsNaN(b), MathHelper.CoeffecientsToString("Expected NaN for a, b and c, but got ", a, b, c));
Assert.IsTrue(float.IsNaN(c), MathHelper.CoeffecientsToString("Expected NaN for a, b and c, but got ", a, b, c));
}
