请使用C++编写一个随机地形生成的示例大小为10241024

这里是一个简单的随机地形生成示例，使用了Perlin噪声算法：

#include #include

const int SIZE = 1024; const int OCTAVES = 8; const float PERSISTENCE = 0.5f;

float lerp(float a, float b, float t) { return a + t * (b - a); }

float smoothstep(float t) { return t * t * (3 - 2 * t); }

float perlin(float x, float y) { float total = 0.0f; float frequency = 1.0f; float amplitude = 1.0f; float maxAmplitude = 0.0f;

for (int i = 0; i < OCTAVES; ++i) {
    total += amplitude * (1.0f + std::sin(x * frequency + y * frequency * 37.0f)) / 2.0f;
    maxAmplitude += amplitude;
    amplitude *= PERSISTENCE;
    frequency *= 2.0f;
}

return total / maxAmplitude;

}

int main() { std::random_device rd; std::mt19937 gen(rd()); std::uniform_real_distribution dist(0.0f, 1.0f);

float terrain[SIZE][SIZE];

for (int y = 0; y < SIZE; ++y) {
    for (int x = 0; x < SIZE; ++x) {
        float nx = (float)x / SIZE - 0.5f;
        float ny = (float)y / SIZE - 0.5f;
        terrain[y][x] = perlin(nx * 8.0f, ny * 8.0f);
    }
}

for (int y = 0; y < SIZE; ++y) {
    for (int x = 0; x < SIZE; ++x) {
        float height = terrain[y][x];
        if (height < 0.3f) {
            std::cout << "\033[44m  \033[0m"; // blue for water
        }
        else if (height < 0.5f) {
            std::cout << "\033[43m  \033[0m"; // yellow for sand
        }
        else if (height < 0.8f) {
            std::cout << "\033[42m  \033[0m"; // green for grass
        }
        else {
            std::cout << "\033[47m  \033[0m"; // white for snow
        }
    }
    std::cout << std::endl;
}

return 0;

}