public override int[] GenLayer(int xCoord, int zCoord, int sizeX, int sizeZ)
{
int[] result = new int[sizeX * sizeZ];
int drawLatticeSize = 16;
float windZoom = 128;
for (int x = 0; x < sizeX + drawLatticeSize; x += drawLatticeSize)
{
for (int z = 0; z < sizeZ + drawLatticeSize; z += drawLatticeSize)
{
PolarVector vec = windmap.getWindAt(((float)xCoord + x) / windZoom, ((float)zCoord + z) / windZoom);
int dx = (int)(vec.length * Math.Cos(vec.angle));
int dz = (int)(vec.length * Math.Sin(vec.angle));
plotLine(result, sizeX, x, z, x + dx, z + dz);
if (x < sizeX && z < sizeZ)
{
result[z * sizeX + x] = 255 << 16;
}
}
}
return(result);
}
static PolarVector BiLerp(float lx, float ly, PolarVector leftTop, PolarVector rightTop, PolarVector leftBottom, PolarVector rightBottom)
{
PolarVector top = new PolarVector(
lx * leftTop.angle + (1 - lx) * rightTop.angle,
lx * leftTop.length + (1 - lx) * rightTop.length
);
PolarVector bottom = new PolarVector(
lx * leftBottom.angle + (1 - lx) * rightBottom.angle,
lx * leftBottom.length + (1 - lx) * rightBottom.length
);
return(new PolarVector(
ly * top.angle + (1 - ly) * bottom.angle,
ly * top.length + (1 - ly) * bottom.length
));
}
public PolarVector getWindAt(double xpos, double zpos)
{
int xPosInt = (int)xpos;
int zPosInt = (int)zpos;
InitPositionSeed(xPosInt, zPosInt);
PolarVector leftTop = new PolarVector((float)(NextInt(360) / 180.0 * Math.PI), NextInt(maxStrength - minStrength) + minStrength);
InitPositionSeed(xPosInt - 1, zPosInt);
PolarVector rightTop = new PolarVector((float)(NextInt(360) / 180.0 * Math.PI), NextInt(maxStrength - minStrength) + minStrength);
InitPositionSeed(xPosInt, zPosInt - 1);
PolarVector leftBottom = new PolarVector((float)(NextInt(360) / 180.0 * Math.PI), NextInt(maxStrength - minStrength) + minStrength);
InitPositionSeed(xPosInt - 1, zPosInt - 1);
PolarVector rightBottom = new PolarVector((float)(NextInt(360) / 180.0 * Math.PI), NextInt(maxStrength - minStrength) + minStrength);
return(BiLerp((float)(xpos - xPosInt), (float)(zpos - zPosInt), leftTop, rightTop, leftBottom, rightBottom));
}
static PolarVector SmoothLerp(float lx, float ly, PolarVector w1, PolarVector w2, PolarVector w3, PolarVector w4)
{
float lxSmooth = SmoothStep(lx);
float lySmooth = SmoothStep(ly);
float lxISmooth = SmoothStep(1 - lx);
float lyISmooth = SmoothStep(1 - ly);
PolarVector r1 = new PolarVector(
lxSmooth * w1.angle + lxISmooth * w2.angle,
lxSmooth * w1.length + lxISmooth * w2.length
);
PolarVector r2 = new PolarVector(
lxSmooth * w3.angle + lxISmooth * w4.angle,
lxSmooth * w3.length + lxISmooth * w4.length
);
return(new PolarVector(
lySmooth * r1.angle + lyISmooth * r2.angle,
lySmooth * r1.length + lyISmooth * r2.length
));
}
