public void ColorAt_should_linearly_interpolate_between_colors()
{
var pattern = new GradientPattern(Colors.White, Colors.Black);
pattern.ColorAt(new Point(0, 0, 0)).Should().Be(Colors.White);
pattern.ColorAt(new Point(0.25, 0, 0)).Should().Be(new Color(0.75, 0.75, 0.75));
pattern.ColorAt(new Point(0.5, 0, 0)).Should().Be(new Color(0.5, 0.5, 0.5));
pattern.ColorAt(new Point(0.75, 0, 0)).Should().Be(new Color(0.25, 0.25, 0.25));
}
public void TestGradientPatternTransform()
{
var pattern = new GradientPattern(_white, _black);
Assert.AreEqual(_white, pattern.ColorAt(Tuple.Point(0, 0, 0)));
Assert.AreEqual(new Color(0.75, 0.75, 0.75), pattern.ColorAt(Tuple.Point(0.25, 0, 0)));
Assert.AreEqual(new Color(0.5, 0.5, 0.5), pattern.ColorAt(Tuple.Point(0.5, 0, 0)));
Assert.AreEqual(new Color(0.25, 0.25, 0.25), pattern.ColorAt(Tuple.Point(1.75, 0, 0)));
}
public void ColorAt()
{
var pattern = new GradientPattern(Color.White, Color.Black);
Assert.Equal(Color.White, pattern.ColorAt(Point.Zero));
Assert.Equal(new Color(0.75f, 0.75f, 0.75f), pattern.ColorAt(new Point(0.25f, 0, 0)));
Assert.Equal(new Color(0.5f, 0.5f, 0.5f), pattern.ColorAt(new Point(0.5f, 0, 0)));
Assert.Equal(new Color(0.25f, 0.25f, 0.25f), pattern.ColorAt(new Point(0.75f, 0, 0)));
Assert.Equal(Color.Black, pattern.ColorAt(new Point(1, 0, 0)));
}
private static void TestCase05()
{
// A gradient linearly interpolates between colors
Pattern pattern = new GradientPattern(white, black);
Assert.Equal(white, pattern.ColorAt(Tuple.Point(0, 0, 0)));
Assert.Equal(Tuple.Color(0.75f, 0.75f, 0.75f), pattern.ColorAt(Tuple.Point(0.25f, 0, 0)));
Assert.Equal(Tuple.Color(0.5f, 0.5f, 0.5f), pattern.ColorAt(Tuple.Point(0.5f, 0, 0)));
Assert.Equal(Tuple.Color(0.25f, 0.25f, 0.25f), pattern.ColorAt(Tuple.Point(0.75f, 0, 0)));
}
public void Linearly_Interpolates_Between_Colors()
{
var pattern = new GradientPattern(Color.White, Color.Black);
var unitSphere = new Sphere();
pattern.ColorAt(new Point(0, 0, 0), unitSphere).ShouldBe(Color.White);
pattern.ColorAt(new Point(0.25, 0, 0), unitSphere).ShouldBe(Color.White * .75);
pattern.ColorAt(new Point(0.5, 0, 0), unitSphere).ShouldBe(Color.White * .5);
pattern.ColorAt(new Point(0.75, 0, 0), unitSphere).ShouldBe(Color.White * .25);
}
public void A_gradient_linearly_interpolates_between_colors()
{
var pattern = new GradientPattern(Color.White, Color.Black);
Assert.AreEqual(
new Color(1, 1, 1),
pattern.ColorAt(Tuple.Point(0, 0, 0)));
Assert.AreEqual(
new Color(0.75, 0.75, 0.75),
pattern.ColorAt(Tuple.Point(0.25, 0, 0)));
Assert.AreEqual(
new Color(0.5, 0.5, 0.5),
pattern.ColorAt(Tuple.Point(0.5, 0, 0)));
Assert.AreEqual(
new Color(0.25, 0.25, 0.25),
pattern.ColorAt(Tuple.Point(0.75, 0, 0)));
}