public void LinearInterpTest(double alpha)
{
const double N0 = 0.0;
const double N1 = 1.0;
Assert.Equal(alpha, NoiseMath.Linear(N0, N1, alpha));
}
/// <summary>
/// See the documentation on the base class.
/// <seealso cref="Module"/>
/// </summary>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <param name="z">Z coordinate</param>
/// <returns>Returns the computed value</returns>
public override double GetValue(double x, double y, double z)
{
var v0 = SourceModules[0].GetValue(x, y, z);
var v1 = SourceModules[1].GetValue(x, y, z);
var alpha = (SourceModules[2].GetValue(x, y, z) + 1) / 2;
return(NoiseMath.Linear(v0, v1, alpha));
}
/// <summary>
/// See the documentation on the base class.
/// <seealso cref="Module"/>
/// </summary>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <param name="z">Z coordinate</param>
/// <returns>Returns the computed value</returns>
public override double GetValue(double x, double y, double z)
{
double v0 = this.SourceModules[0].GetValue(x, y, z);
double v1 = this.SourceModules[1].GetValue(x, y, z);
double alpha = (this.SourceModules[2].GetValue(x, y, z) + 1) / 2;
return(NoiseMath.Linear(v0, v1, alpha));
}
public void Math_Interp_Linear_Right_Test()
{
var value1 = 0D;
var value2 = 5D;
var alpha = 1D;
var expected = 5D;
var actual = NoiseMath.Linear(value1, value2, alpha);
Assert.AreEqual(expected, actual);
}
/// <summary>
/// See the documentation on the base class.
/// <seealso cref="Module"/>
/// </summary>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <param name="z">Z coordinate</param>
/// <returns>Returns the computed value</returns>
public override double GetValue(double x, double y, double z)
{
// Get the output value from the source module.
double sourceModuleValue = SourceModules[0].GetValue(x, y, z);
// Find the first element in the control point array that has a value
// larger than the output value from the source module.
int indexPos;
for (indexPos = 0; indexPos < ControlPoints.Count; indexPos++)
{
if (sourceModuleValue < ControlPoints[indexPos].x)
{
break;
}
}
// Find the two nearest control points so that we can map their values
// onto a quadratic curve.
var index0 = NoiseMath.Clamp(indexPos - 1, 0, ControlPoints.Count - 1);
var index1 = NoiseMath.Clamp(indexPos, 0, ControlPoints.Count - 1);
// If some control points are missing (which occurs if the output value from
// the source module is greater than the largest value or less than the
// smallest value of the control point array), get the value of the nearest
// control point and exit now.
if (index0 == index1)
{
return(ControlPoints[index1].x);
}
// Compute the alpha value used for linear interpolation.
var value0 = ControlPoints[index0].x;
var value1 = ControlPoints[index1].x;
var alpha = (sourceModuleValue - value0) / (value1 - value0);
if (InvertTerraces)
{
alpha = 1.0 - alpha;
NoiseMath.Swap(ref value0, ref value1);
}
// Squaring the alpha produces the terrace effect.
alpha *= alpha;
// Now perform the linear interpolation given the alpha value.
return(NoiseMath.Linear(value0, value1, alpha));
}
/// <summary>
/// Calculates the destination color.
/// </summary>
/// <param name="sourceColor">The source color generated from the color
/// gradient.</param>
/// <param name="backgroundColor">The color from the background image at the
/// corresponding position.</param>
/// <param name="lightValue">The intensity of the light at that position.</param>
/// <returns>The destination color.</returns>
Color CalcDestinationColor(Color sourceColor, Color backgroundColor, double lightValue)
{
var sourceRed = (double)sourceColor.Red / 255.0;
var sourceGreen = (double)sourceColor.Green / 255.0;
var sourceBlue = (double)sourceColor.Blue / 255.0;
var sourceAlpha = (double)sourceColor.Alpha / 255.0;
var backgroundRed = (double)backgroundColor.Red / 255.0;
var backgroundGreen = (double)backgroundColor.Green / 255.0;
var backgroundBlue = (double)backgroundColor.Blue / 255.0;
// First, blend the source color to the background color using the alpha
// of the source color.
var red = NoiseMath.Linear(backgroundRed, sourceRed, sourceAlpha);
var green = NoiseMath.Linear(backgroundGreen, sourceGreen, sourceAlpha);
var blue = NoiseMath.Linear(backgroundBlue, sourceBlue, sourceAlpha);
if (EnableLight)
{
// Now calculate the light color.
var lightRed = lightValue * (double)LightColor.Red / 255.0;
var lightGreen = lightValue * (double)LightColor.Green / 255.0;
var lightBlue = lightValue * (double)LightColor.Blue / 255.0;
// Apply the light color to the new color.
red *= lightRed;
green *= lightGreen;
blue *= lightBlue;
}
// Clamp the color channels to the (0..1) range.
red = NoiseMath.Clamp(red, 0, 1);
green = NoiseMath.Clamp(green, 0, 1);
blue = NoiseMath.Clamp(blue, 0, 1);
// Rescale the color channels to the (0..255) range and return
// the new color.
Color newColor = new Color(
(byte)((int)(red * 255) & 0xff),
(byte)((int)(green * 255) & 0xff),
(byte)((int)(blue * 255) & 0xff),
Math.Max(sourceColor.Alpha, backgroundColor.Alpha));
return(newColor);
}
protected override void BuildImpl(CancellationToken cancellationToken)
{
Plane planeModel = new Plane(SourceModule);
var xExtent = UpperXBound - LowerXBound;
var zExtent = UpperZBound - LowerZBound;
var xDelta = xExtent / destWidth;
var zDelta = zExtent / destHeight;
var po = new ParallelOptions()
{
CancellationToken = cancellationToken,
};
Parallel.For(0, destHeight, po, z =>
{
double zCur = LowerZBound + z * zDelta;
int x;
double xCur;
for (x = 0, xCur = LowerXBound; x < destWidth; x++, xCur += xDelta)
{
float finalValue;
if (!EnableSeamless)
{
finalValue = (float)planeModel.GetValue(xCur, zCur);
}
else
{
var swValue = planeModel.GetValue(xCur, zCur);
var seValue = planeModel.GetValue(xCur + xExtent, zCur);
var nwValue = planeModel.GetValue(xCur, zCur + zExtent);
var neValue = planeModel.GetValue(xCur + xExtent, zCur + zExtent);
var xBlend = 1.0 - ((xCur - LowerXBound) / xExtent);
var zBlend = 1.0 - ((zCur - LowerZBound) / zExtent);
var z0 = NoiseMath.Linear(swValue, seValue, xBlend);
var z1 = NoiseMath.Linear(nwValue, neValue, xBlend);
finalValue = (float)NoiseMath.Linear(z0, z1, zBlend);
}
DestNoiseMap[x, z] = finalValue;
}
});
}
protected override void BuildImpl(CancellationToken cancellationToken)
{
Plane planeModel = new Plane(this.SourceModule);
double xExtent = this.UpperXBound - this.LowerXBound;
double zExtent = this.UpperZBound - this.LowerZBound;
double xDelta = xExtent / this.destWidth;
double zDelta = zExtent / this.destHeight;
ParallelOptions po = new ParallelOptions()
{
CancellationToken = cancellationToken,
};
Parallel.For(0, this.destHeight, po, z =>
{
double zCur = this.LowerZBound + z * zDelta;
int x;
double xCur;
for (x = 0, xCur = this.LowerXBound; x < this.destWidth; x++, xCur += xDelta)
{
float finalValue;
if (!this.EnableSeamless)
{
finalValue = (float)planeModel.GetValue(xCur, zCur);
}
else
{
double swValue = planeModel.GetValue(xCur, zCur);
double seValue = planeModel.GetValue(xCur + xExtent, zCur);
double nwValue = planeModel.GetValue(xCur, zCur + zExtent);
double neValue = planeModel.GetValue(xCur + xExtent, zCur + zExtent);
double xBlend = 1.0 - ((xCur - this.LowerXBound) / xExtent);
double zBlend = 1.0 - ((zCur - this.LowerZBound) / zExtent);
double z0 = NoiseMath.Linear(swValue, seValue, xBlend);
double z1 = NoiseMath.Linear(nwValue, neValue, xBlend);
finalValue = (float)NoiseMath.Linear(z0, z1, zBlend);
}
this.DestNoiseMap[x, z] = finalValue;
}
});
}
/// <summary>
/// See the documentation on the base class.
/// <seealso cref="Module"/>
/// </summary>
/// <param name="x">X coordinate</param>
/// <param name="y">Y coordinate</param>
/// <param name="z">Z coordinate</param>
/// <returns>Returns the computed value</returns>
public override double GetValue(double x, double y, double z)
{
var controlValue = SourceModules[2].GetValue(x, y, z);
double alpha;
if (EdgeFalloff > 0.0)
{
if (controlValue < (LowerBound - EdgeFalloff))
{
// The output value from the control module is below the selector
// threshold; return the output value from the first source module.
return(SourceModules[0].GetValue(x, y, z));
}
else if (controlValue < (LowerBound + EdgeFalloff))
{
// The output value from the control module is near the lower end of the
// selector threshold and within the smooth curve. Interpolate between
// the output values from the first and second source modules.
double lowerCurve = (LowerBound - EdgeFalloff);
double upperCurve = (LowerBound + EdgeFalloff);
alpha = NoiseMath.SCurve3((controlValue - lowerCurve) / (upperCurve - lowerCurve));
return(NoiseMath.Linear(SourceModules[0].GetValue(x, y, z),
SourceModules[1].GetValue(x, y, z),
alpha));
}
else if (controlValue < (UpperBound - EdgeFalloff))
{
// The output value from the control module is within the selector
// threshold; return the output value from the second source module.
return(SourceModules[1].GetValue(x, y, z));
}
else if (controlValue < (UpperBound + EdgeFalloff))
{
// The output value from the control module is near the upper end of the
// selector threshold and within the smooth curve. Interpolate between
// the output values from the first and second source modules.
double lowerCurve = (UpperBound - EdgeFalloff);
double upperCurve = (UpperBound + EdgeFalloff);
alpha = NoiseMath.SCurve3((controlValue - lowerCurve) / (upperCurve - lowerCurve));
return(NoiseMath.Linear(SourceModules[1].GetValue(x, y, z),
SourceModules[0].GetValue(x, y, z),
alpha));
}
else
{
// Output value from the control module is above the selector threshold;
// return the output value from the first source module.
return(SourceModules[0].GetValue(x, y, z));
}
}
else
{
if (controlValue < LowerBound || controlValue > UpperBound)
{
return(SourceModules[0].GetValue(x, y, z));
}
else
{
return(SourceModules[1].GetValue(x, y, z));
}
}
}
