public override void Generate(Color[] pixels, int width, int height)
{
base.Generate(pixels, width, height);
// An array which will contain the procedurally generated heights
float[] heights = new float[width];
// Perform midpoint displacement
Noise.MPD(heights, roughness, () => (float)PRNG.NextDouble());
// Normalize line to better fit in image
MMath.Normalize(
heights,
height * imagePadding,
height - height * imagePadding - 1);
// Fill image with white
Fill(pixels, Color.white);
// Draw 2D landscape on image
for (int x = 0; x < width; x++)
{
// Place the pixel in the image
pixels[(int)heights[x] * width + x] = Color.black;
// Create a line between unconnected neighbors
if (x > 0 && Math.Abs(heights[x - 1] - heights[x]) > 1)
{
// Determine high and low neighbor points
int xHigh, xLow;
int toFill = Math.Abs((int)heights[x - 1] - (int)heights[x]) / 2;
int yHigh = Math.Max((int)heights[x - 1], (int)heights[x]);
int yLow = Math.Min((int)heights[x - 1], (int)heights[x]);
if (yHigh == (int)heights[x - 1])
{
xHigh = x - 1;
xLow = x;
}
else
{
xHigh = x;
xLow = x - 1;
}
// Vertically connect high and low neighbor points
for (int dy = 1; dy <= toFill; dy++)
{
pixels[(yHigh - dy) * width + xHigh] = Color.black;
if ((yHigh - dy) != (yLow + dy))
{
pixels[(yLow + dy) * width + xLow] = Color.black;
}
}
}
}
}
public override void Generate(float[,] heights)
{
// Apply faults
for (int i = 0; i < numFaults; i++)
{
Landscape.FaultModifier(
heights, meanDepth, () => (float)PRNG.NextDouble(),
decreaseDistance);
}
}
public override void Generate(Color[] pixels, int width, int height)
{
base.Generate(pixels, width, height);
// Fill vector of pixels with random black or white pixels
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// Get a random value between 0 and 1
double val = PRNG.NextDouble();
// Determine color based on obtained random value
Color color = val > blackChance ? Color.white : Color.black;
// Set color in pixels array
pixels[i * width + j] = color;
}
}
}
// TODO Move CA1D generic functionality to libGameAI
public override void Generate(Color[] pixels, int width, int height)
{
base.Generate(pixels, width, height);
// Array of colors to generate according to the three previous
// bits (2^3 = 8 values)
Color[] ruleList = new Color[bitsInByte];
// Local copy of rule
int localRule = rule;
// Get colors to generate according to three previous bits
for (int i = 0; i < bitsInByte; i++)
{
int bit = localRule & 1;
ruleList[i] = bit == 1 ? Color.black : Color.white;
localRule >>= 1;
}
// Initialize first (bottom) line
if (singleCenterPixel)
{
for (int i = 0; i < width; i++)
{
pixels[i] = Color.white;
}
// Put just one black pixel in the middle
pixels[width / 2] = Color.black;
}
else
{
// Randomly initialize the bottom line
for (int i = 0; i < width; i++)
{
pixels[i] = PRNG.NextDouble() < 0.5 ? Color.white : Color.black;
}
}
// Run cellular automata rule on image
for (int i = 1; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// Find indexes of rule bits in previous line
int i2 = j > 0 ? j - 1 : width - 1;
int i1 = j;
int i0 = j < width - 1 ? j + 1 : 0;
// Get bits in previous line
int v2 = pixels[(i - 1) * width + i2] == Color.black ? 1 : 0;
int v1 = pixels[(i - 1) * width + i1] == Color.black ? 1 : 0;
int v0 = pixels[(i - 1) * width + i0] == Color.black ? 1 : 0;
// Get rule index
int ruleIdx = (v2 << 2) + (v1 << 1) + v0;
// Apply rule to current position
pixels[i * width + j] = ruleList[ruleIdx];
}
}
}
public override void Generate(float[,] heights)
{
Landscape.DiamondSquare(heights, maxInitHeight, roughness, () => (float)PRNG.NextDouble());
}
// TODO Move CA2D generic functionality to libGameAI
public override void Generate(Color[] pixels, int width, int height)
{
base.Generate(pixels, width, height);
Color[] aux;
Color[] buf1 = new Color[pixels.Length];
Color[] buf2 = new Color[pixels.Length];
// Randomly place rocks in the scenario
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// Put rock or floor, randomly
buf1[i * width + j] =
PRNG.NextDouble() < initRocks ? ROCK : FLOOR;
}
}
// Run cellular automata
for (int step = 0; step < steps; step++)
{
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// How many rocks around here?
int numRocks = CountRocks(buf1, width, height, i, j, neighSize);
// Put rock or floor, randomly
buf2[i * width + j] =
numRocks >= rockThreshold ? ROCK : FLOOR;
}
}
// Swap buffers
aux = buf1;
buf1 = buf2;
buf2 = aux;
}
// Post-process border rocks for visual effect
if (drawRockOutline)
{
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
if (buf1[i * width + j] == ROCK)
{
// How many rocks around here?
int numRocks = CountRocks(buf1, width, height, i, j, 1);
if (numRocks < 9)
{
// Put border rock
buf1[i * width + j] = BORDER;
}
}
}
}
}
// Copy buf1 data to pixels
for (int i = 0; i < pixels.Length; i++)
{
pixels[i] = buf1[i];
}
}
public void TestPRNG()
{
const int iterations = 5000000;
Console.WriteLine();
int trues = 0;
int larger = 0;
int smaller = 0;
for (int i = 0; i < iterations; i++)
{
if (PRNG.NextBool())
{
trues++;
}
int val = PRNG.Next(5, 8); // 5, 6 or 7
switch (val)
{
case 5:
smaller++;
break;
case 6:
break;
case 7:
larger++;
break;
default:
Assert.Fail("Value " + val + " isn't 5, 6 or 7");
break;
}
// ranged
var r1 = (int)PRNG.NextUInt32();
var r2 = (int)PRNG.NextUInt32();
if (r1 < r2)
{
var rr = PRNG.Next(r1, r2);
Assert.IsTrue(rr >= r1 && rr < r2, rr.ToString() + " is not between " + r1 + " and " + r2);
}
else if (r1 > r2)
{
var rr = PRNG.Next(r2, r1);
Assert.IsTrue(rr >= r2 && rr < r1, rr.ToString() + " is not between " + r2 + " and " + r1);
}
}
var p = (double)trues / (double)iterations;
Assert.IsTrue(p > 0.495 && p < 0.505);
const double third = 1.0 / 3.0;
const double offset = third * 0.05;
const double low = third - offset;
const double high = third + offset;
p = (double)smaller / (double)iterations;
Assert.IsTrue(p > low && p < high);
p = (double)larger / (double)iterations;
Assert.IsTrue(p > low && p < high);
// make sure nextdouble() and nextfloat() don't generate numbers outside range
var state = RandomSeed.GetUInt64();
for (int r = 0; r < 10000000; r++)
{
double d = PRNG.NextDouble(ref state);
Assert.IsTrue(d >= 0.0 && d < 1.0);
float f = PRNG.NextFloat(ref state);
Assert.IsTrue(f >= 0.0f && f < 1.0f);
}
}
