public void BlendColor_ReturnsRatioBlendedColor()
{
// prereq
IsValidColor_ExtensionReturnsAnswer();
// arrange
Color left = new Color(0.1f, 0.7f, 0.4f, 0.5f);
Color right = new Color(0.6f, 0.2f, 0.4f, 0.9f);
float ratio = 0.1f, invRatio = 1 - ratio;
Color expectedNoAlpha = new Color(
left.r * ratio + right.r * invRatio,
left.g * ratio + right.g * invRatio,
left.b * ratio + right.b * invRatio,
left.a);
Color expectedYesAlpha = expectedNoAlpha;
expectedYesAlpha.a = ratio * left.a + invRatio * right.a;
// act
Color blendNoAlpha = Palette.BlendColors(left, right, ratio);
Color blendYesAlpha = Palette.BlendColors(left, right, ratio, true);
// assert
Assert.IsTrue(blendNoAlpha.IsValidColor(), TestHelper.ShowVariable("blend w/o alpha is valid: ", false));
Assert.AreEqual(expectedNoAlpha, blendNoAlpha, "no alpha: " + TestHelper.ShowVariables(expectedNoAlpha, blendNoAlpha));
Assert.IsTrue(blendYesAlpha.IsValidColor(), TestHelper.ShowVariable("blend w/ alpha is valid: ", false));
Assert.AreEqual(expectedYesAlpha, blendYesAlpha, "yes alpha: " + TestHelper.ShowVariables(expectedYesAlpha, blendYesAlpha));
}
public void AverageColors_ReturnsAveragedColors()
{
// prereq
BlendColor_ReturnsRatioBlendedColor();
// arrange
Color left = Color.green;
Color right = Color.cyan;
// act
Color average = Palette.AverageColors(left, right);
Color expected = Palette.BlendColors(left, right, 0.5f);
// assert
Assert.AreEqual(expected, average, TestHelper.LabelAs("left, right"));
}
public void BlendColor_ReturnsDropBlendedColor()
{
// arrange
Color left = Color.red;
Color right = Palette.PastelYellow;
int leftDrops = 5, rightDrops = 2;
int totalDrops = leftDrops + rightDrops;
// act
Color blend = Palette.BlendColors(left, right, 5, 2);
float r = left.r * (float)leftDrops / totalDrops + right.r * (float)rightDrops / totalDrops;
float g = left.g * (float)leftDrops / totalDrops + right.g * (float)rightDrops / totalDrops;
float b = left.b * (float)leftDrops / totalDrops + right.b * (float)rightDrops / totalDrops;
// assert
Assert.IsTrue(PMath.Approx(r, blend.r), "r: " + TestHelper.ShowVariables(r, blend.r));
Assert.IsTrue(PMath.Approx(g, blend.g), "g: " + TestHelper.ShowVariables(g, blend.g));
Assert.IsTrue(PMath.Approx(b, blend.b), "b: " + TestHelper.ShowVariables(b, blend.b));
}