java - 为什么 "ball"在与数组的某些部分相交时不改变颜色？ (java)

Question

此代码适用于一款名为“brick-breaker”的游戏。我试图让球在与数组相交时改变颜色。我为自定义颜色的 R、G、B 值创建了一个 int，并在与 1-255 之间的数字相交时生成这些 int

import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
import java.util.Random;
public class brickbreaker extends Applet implements MouseListener, Runnable,       KeyListener
{                                
Thread main=new Thread(this); 
int mouseX, mouseY;
int paddleX = 200, x,y,height,width, ballX = 100, ballY = 400, xChange = 1,     yChange = 4, paddleWidth = 150, pageCt = 1, score = 0;
boolean pause = false, gameover=false;
boolean blocks[][] = new boolean [6][10];
int randomR = 255, randomG = 205, randomB = 155;
Random red = new Random();
Random green = new Random();
Random blue = new Random();
Image buffer;
Graphics bufferG;
String input="";    
Font font3 = new Font ("Impact",5,50);
Font font4 = new Font ("Impact",5,150);
Font font5 = new Font ("Impact",5,30);
Color randomColor = new Color(randomR,randomG,randomB);
public void init()
{
    resize( 1300,700 );
    buffer = createImage(this.getWidth(),this.getHeight());
    bufferG = buffer.getGraphics();

    this.setLayout (null);

    this.addKeyListener(this);

    this.addMouseListener(this); 

    this.resize(1400,700);
    main.start();



    for(int r=0;r<6;r++)
        for(int c=0;c<10;c++)
            blocks[r][c] = true;
}

public void drawBlocks(Graphics g)
{
    for(int r=0;r<6;r++)
        for(int c=0;c<10;c++)
            if(blocks[r][c])

                g.drawRect(100+100*c, 30+30*r, 100, 30);
}

public void run()
{
    if (pageCt==1)
    {
        while(! gameover)
        {
            if(pause==false)
            {
                repaint(); 
                ballX = ballX + xChange;
                ballY = ballY + yChange;
                Rectangle ballRect = new Rectangle (ballX, ballY, 15, 15);
                Rectangle paddleRect = new Rectangle (paddleX,650,paddleWidth,10);
                Rectangle boundRect = new Rectangle (0,690,1300,10);
                for(int r=0;r<6;r++)
                    for(int c=0;c<10;c++)
                        if(blocks[r][c])
                        {
                            Rectangle blockRect = new Rectangle (100+100*c, 30+30*r, 100, 30);
                            if(blockRect.intersects(ballRect))
                            {
                                blocks[r][c] = false;
                                yChange *=-1;
                                score++;
                                randomR=red.nextInt(255);
                                randomB=blue.nextInt(255);
                                randomG=green.nextInt(255);                                   
                                if (score==60)
                                    pageCt=4;
                            }
                        }

                if(ballX < 5 || ballX > 1280)
                    xChange = -1*xChange;
                if(ballY < 5 || ballY > 690)
                    yChange = -1*yChange;
                if (ballRect.intersects (paddleRect))
                {
                    yChange = yChange*-1;
                    //paddleWidth=paddleWidth-3;
                }
                if (ballRect.intersects (boundRect))
                {
                    pageCt=2;
                }
            }
            repaint();
            try
            {main.sleep(20);}
            catch(Exception e) {}
        }
    }
}

public void keyPressed(KeyEvent e)    // makes applet do something when clicked.
{       
    int code = e.getKeyCode();
    if(code == e.VK_P)
    {
        if(pause==false)
            pause=true;
        else
            pause=false;
    }
    if (pause==false)
    {
        if(paddleX>20)
        {
            if(code == e.VK_A)
            {
                paddleX = paddleX-20;
            }
        }
        if(paddleX<1160)
        {
            if(code == e.VK_D)
            {
                paddleX = paddleX+20;
            }
        }
    }
} 

public void paint(Graphics g)                    // Outputs on screen
{
    if (pageCt==1)
    {
        bufferG.setColor(Color.black);
        bufferG.fillRect(0,0,1300,700);
        bufferG.setColor(Color.blue);
        bufferG.setColor(Color.black);
        bufferG.fillRect(0,0,this.getWidth(),this.getHeight());
        bufferG.setColor(randomColor);
        bufferG.fillOval(ballX,ballY,15,15);
        bufferG.setColor(Color.white);
        bufferG.fillRect(paddleX,650,paddleWidth,10);
        drawBlocks(bufferG);
        bufferG.setFont(font5);
        bufferG.drawString("Score : "+score,10,20);
    }
    if (pageCt==2)
    {
        bufferG.setColor(Color.black);
        bufferG.fillRect(0,0,1300,700);
        bufferG.setColor(Color.white);
        bufferG.setFont(font4);
        bufferG.drawString("You Lose!", 350,400);
    }
    if (pause==true)
    {
        bufferG.setColor(Color.white);
        bufferG.setFont(font4);
        bufferG.drawString("PAUSED",400,350);
    }
    if (pageCt==0)
    {
        bufferG.drawString("- Click to begin -",350,350); 
    }
    g.drawImage(buffer,0,0,this);
}

public void update(Graphics g)
{
    paint(g);
}

public void mouseClicked (MouseEvent e) {}

public void keyReleased( KeyEvent e){}

public void keyTyped (KeyEvent e){}

public void mousePressed (MouseEvent e)
{
    if(pageCt==0)
    {
        pageCt++;
        repaint();
    }
}

public void mouseReleased (MouseEvent e) {}

public void mouseEntered (MouseEvent e){}

public void mouseExited (MouseEvent e) {}

}

Answer 1

颜色不会改变，因为您没有使用随机生成的值更新它。

randomR=red.nextInt(255);
randomB=blue.nextInt(255);
randomG=green.nextInt(255);  
randomColor = new Color(randomR,randomG,randomB); // <- add this line