所以我正在尝试生成Perlin噪声并将其保存为图像文件。我已成功保存了图像,但噪声看起来并不像Perlin噪声。
这是我的代码:
这是我的代码:
package com.egs.survivalsim.util;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.egs.survivalsim.MainComponent;
public class Noise {
MainComponent main;
public double noise(int x,int y){
x = x + y * 57;
x = ((x << 13) ^ x);
double t = (x * (x * x * 15731 + 789221) + 1376312589) & 0x7fffffff;
return 1 - t * 0.000000000931322574615478515625;
}
public double sNoise(int x, int y){
double corners = (noise(x - 1, y - 1) + noise(x + 1, y - 1) + noise(x - 1, y + 1) + noise(x + 1, y + 1)) * 0.0625;
double sides = (noise(x - 1, y) + noise(x + 1, y) + noise(x, y - 1) + noise(x, y + 1)) * 0.125;
double center = noise(x, y) * 0.25;
return corners + sides + center;
}
public double lInterpoleLin(double a, double b, double x){
return a * (1 - x) + b * x;
}
public double lInterpoleCos(double a, double b, double x){
double ft = x * 3.1415927;
double f = (1 - Math.cos(ft)) * 0.001;
return a * (1 - f) + b * f;
}
public double iNoise(double x, double y){
int iX = (int) x;
int iY = (int) y;
double dX = x - iX;
double dY = y - iY;
double p1 = sNoise(iX, iY);
double p2 = sNoise(iX + 1, iY);
double p3 = sNoise(iX, iY + 1);
double p4 = sNoise(iX + 1, iY + 1);
double i1 = lInterpoleCos(p1 ,p2 ,dX);
double i2 = lInterpoleCos(p3, p4, dX);
return lInterpoleCos(i1, i2, dY);
}
public double pNoise(double x, double y, double persistence, int octave){
double result;
double amplitude = 1;
int frequence = 1;
result = 0;
for(int n = 0; n < octave; n++){
frequence <<= 1;
amplitude *= persistence;
result += iNoise(x * frequence, y * frequence) * amplitude;
}
return result;
}
public void startNoise(MainComponent main){
System.out.println("Generating noise map");
this.main = main;
System.out.println("Width: " + main.worldWidth);
System.out.println("Height: " + main.worldHeight);
BufferedImage image = new BufferedImage(main.worldWidth, main.worldHeight, BufferedImage.TYPE_INT_RGB);
for(int y = 0; y < main.worldHeight; y++){
for(int x = 0; x < main.worldWidth; x++){
double c = pNoise((double) x - main.worldWidth, (double) y - main.worldHeight, 0.2, 2);
c *= 128.0;
c += 127.0;
if(c > 255.0){
c = 255.0;
}
if(c < 0.0){
c = 0.0;
}
int r = (int) c;
int g = (int) c;
int b = (int) c;
if(c>128)
r>>=1;
if(c>128)
b>>=1;
int color = new Color(r, g, b).getRGB();
image.setRGB(x, y, color);
main.noiseArray[x][y] = (int) c;
}
}
File fileImage = new File("noise.png");
try {
ImageIO.write(image, "png", fileImage);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Noise map generated");
}
}