public void Distance_When_Point_Is_Endpoint()
{
var strategy = new DistanceStrategy();
Assert.AreEqual(0, strategy.Distance(1, 0, 1, 0, 2, 0));
Assert.AreEqual(0, strategy.Distance(0, 2, 2, 0, 0, 2));
}
public void Distance_Is_Correct_Negative()
{
var strategy = new DistanceStrategy();
// XAxis (slope = zero) to point [1,-1]
Assert.AreEqual(1, strategy.Distance(1, -1, 0, 0, 2, 0));
// 1 up from XAxis (slope = zero) to point [1,-1]
Assert.AreEqual(2, strategy.Distance(1, -1, 0, 1, 2, 1));
}
public void Distance_Is_Correct_Vertical()
{
var strategy = new DistanceStrategy();
// YAxis (slope = infinite) to point [1, 1]
Assert.AreEqual(1, strategy.Distance(1, 1, 0, 0, 0, 2));
// YAxis (slope = infinite) to point on line.
Assert.AreEqual(0, strategy.Distance(0, 1, 0, 0, 0, 2));
// YAxis (slope = infinite) to point [1, 1]
Assert.AreEqual(2, strategy.Distance(2, 1, 0, 0, 0, 4));
// 1 right of YAxis (slope = infinite) to point [2, 1]
Assert.AreEqual(2, strategy.Distance(3, 1, 1, 0, 1, 2));
}
public void Distance_Is_Correct()
{
var strategy = new DistanceStrategy();
// XAxis (slope = zero) to point [1,1]
Assert.AreEqual(1, strategy.Distance(1, 1, 0, 0, 2, 0));
// XAxis (slope = zero) to point [1,1]
Assert.AreEqual(1, strategy.Distance(1, 1, 0, 0, 4, 0));
// XAxis (slope = zero) to point on line.
Assert.AreEqual(0, strategy.Distance(1, 0, 0, 0, 4, 0));
// 1 up from XAxis (slope = zero) to point [1, 2]
Assert.AreEqual(1, strategy.Distance(1, 2, 0, 1, 2, 1));
// 1 up from XAxis (slope = zero) to point [1, 2]
Assert.AreEqual(1, strategy.Distance(1, 2, 0, 1, 2, 1));
}
public void Distance_Is_Correct_To_Endpoint()
{
var strategy = new DistanceStrategy();
// Horizontal
Assert.AreEqual(5, strategy.Distance(-3, 4, 0, 0, 2, 0));
Assert.AreEqual(5, strategy.Distance(3, 4, 0, 0, -2, 0));
Assert.AreEqual(5, strategy.Distance(-3, -4, 0, 0, 2, 0));
Assert.AreEqual(5, strategy.Distance(-2, -4, 1, 0, 3, 0));
// Vertical
Assert.AreEqual(5, strategy.Distance(-3, -4, 0, 0, 0, 2));
Assert.AreEqual(5, strategy.Distance(-3, -4, 0, 0, 0, 2));
// Slope
Assert.AreEqual(2, strategy.Distance(-2, 2, 2, 0, 0, 2));
Assert.AreEqual(2, strategy.Distance(4, 0, 2, 0, 0, 2));
}
