我正在尝试在我的 Java Mandelbrot 应用程序中实现多线程:
目前为止,这是我的实现:
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
public class MandelbrotSet {
private int numberOfIterations;
private double realMin;
private double realMax;
private double imaginaryMin;
private double imaginaryMax;
private int width;
private int height;
public BufferedImage image;
public Graphics2D imageGraphics;
public MandelbrotSet() {
// Set the width and the height
this.width = 600;
this.height = 400;
image = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);
imageGraphics = image.createGraphics();
this.realMin = -2.0;
this.realMax = 1;
this.imaginaryMin = -1;
this.imaginaryMax = 1;
this.numberOfIterations = 1000;
}
public Complex calculateComplexNumber(int x, int y) {
double realPart = realMin + x * (realMax - realMin) / (this.getWidth() - 1);
double imaginaryPart = imaginaryMax - y * (imaginaryMax - imaginaryMin) / (this.getHeight() - 1);
return new Complex(realPart, imaginaryPart);
}
public void calculateMandelbrotImagePoints() {
Thread[] threads = new Thread[4];
for (int i = 0; i < maxThreads; i++) {
threads[i] = new Thread(new MThread(i));
threads[i].start();
}
}
class MThread implements Runnable {
private int i;
public MThread(int i) {
this.i = i;
}
//Method uses the thread number to draw the mandelbrot in columns
public void run() {
for (int x = i; x < width; x += 4) {
for (int y = 0; y < height; y++) {
int n = 0;
Complex c = calculateComplexNumber(x, y);
Complex z = c;
while ((zNumber.modulusSquared() < 4.0D) && (n < numberOfIterations)) {
z = z.square();
z.add(c);
n++;
}
if (n == numberOfIterations) {
imageGraphics.setColor(Color.BLACK);
} else {
imageGraphics.setColor(Color.getHSBColor(n / 100.0F, 1, 1));
}
imageGraphics.drawLine(x,y,x,y);
}
}
}
}
}
发生的问题是在绘制图像时,图像中显示了不正确的像素:
![http://i.stack.imgur.com/wq2TN.png](https://istack.dev59.com/mXdYp.webp)
threads[i].isAlive();
图片似乎成功显示了,但是渲染这个图片需要的时间更长(多达3倍)。
我有两个疑问:
我做错了什么?
对于大量迭代(>1000),绘制曼德布洛特集到
BufferedImage
的最佳方式是什么?