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];
}
}
}
}
