private static PdfFunction ConstructSingleGradientSegmentFunction(GradientColorStop from, GradientColorStop
to)
{
double exponent = 1d;
float[] fromColor = from.GetRgbArray();
float[] toColor = to.GetRgbArray();
if (from.GetHintOffsetType() == GradientColorStop.HintOffsetType.RELATIVE_BETWEEN_COLORS)
{
double hintOffset = from.GetHintOffset();
if (hintOffset <= 0d + ZERO_EPSILON)
{
fromColor = toColor;
}
else
{
if (hintOffset >= 1d - ZERO_EPSILON)
{
toColor = fromColor;
}
else
{
// similar to css color hint logic
exponent = Math.Log(0.5) / Math.Log(hintOffset);
}
}
}
return(new PdfFunction.Type2(new PdfArray(new float[] { 0f, 1f }), null, new PdfArray(fromColor), new PdfArray
(toColor), new PdfNumber(exponent)));
}
public virtual void CornerCasesTest()
{
GradientColorStop stopToTest = new GradientColorStop((float[])null, 1.5, GradientColorStop.OffsetType.AUTO
).SetHint(1.5, GradientColorStop.HintOffsetType.NONE);
NUnit.Framework.Assert.AreEqual(new float[] { 0f, 0f, 0f }, stopToTest.GetRgbArray());
NUnit.Framework.Assert.AreEqual(0, stopToTest.GetOffset(), 1e-10);
NUnit.Framework.Assert.AreEqual(GradientColorStop.OffsetType.AUTO, stopToTest.GetOffsetType());
NUnit.Framework.Assert.AreEqual(0, stopToTest.GetHintOffset(), 1e-10);
NUnit.Framework.Assert.AreEqual(GradientColorStop.HintOffsetType.NONE, stopToTest.GetHintOffsetType());
}
public virtual void NormalizationTest()
{
GradientColorStop stopToTest = new GradientColorStop(new float[] { -0.5f, 1.5f, 0.5f, 0.5f }, 1.5, GradientColorStop.OffsetType
.AUTO).SetHint(1.5, GradientColorStop.HintOffsetType.NONE);
NUnit.Framework.Assert.AreEqual(new float[] { 0f, 1f, 0.5f }, stopToTest.GetRgbArray());
NUnit.Framework.Assert.AreEqual(0, stopToTest.GetOffset(), 1e-10);
NUnit.Framework.Assert.AreEqual(GradientColorStop.OffsetType.AUTO, stopToTest.GetOffsetType());
NUnit.Framework.Assert.AreEqual(0, stopToTest.GetHintOffset(), 1e-10);
NUnit.Framework.Assert.AreEqual(GradientColorStop.HintOffsetType.NONE, stopToTest.GetHintOffsetType());
}