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Java 绘制五彩星星闪烁的代码
2023-06-14 21:41:36 深夜i     --     --
Java Graphics2D 绘图

在 Java 中，我们可以利用 Graphics2D 绘图工具类来绘制五彩闪烁的星星效果。下面是代码实现：



import java.awt.Color;


import java.awt.Dimension;


import java.awt.Graphics;


import java.awt.Graphics2D;


import java.awt.RenderingHints;


import javax.swing.JFrame;


import javax.swing.JPanel;


public class StarDraw extends JPanel {


  @Override


  public void paint(Graphics g) {


    super.paint(g);


    Graphics2D g2d = (Graphics2D)g;


    


    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,


        RenderingHints.VALUE_ANTIALIAS_ON);


    


    for (int i = 1; i <= 5; i++) {


      int x = (int)(Math.random() * (getWidth() - 50));


      int y = (int)(Math.random() * (getHeight() - 50));


      Star star = new Star(x, y, 50, 30, 5, Color.WHITE, Color.getHSBColor((float)Math.random(), 1, 1));


      star.draw(g2d);


    }


    


  }


  


  public static void main(String[] args) {


    JFrame frame = new JFrame("Draw Star");


    frame.add(new StarDraw());


    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    frame.setSize(new Dimension(500, 500));


    frame.setLocationRelativeTo(null);


    frame.setVisible(true);


  }


}


class Star {


  private int x, y, rOuter, rInner, nPoints;


  private Color cInner, cOuter;


  


  public Star(int x, int y, int rOuter, int rInner, int nPoints, Color cOuter, Color cInner)


    this.x = x;


    this.y = y;


    this.rOuter = rOuter;


    this.rInner = rInner;


    this.nPoints = nPoints;


    this.cOuter = cOuter;


    this.cInner = cInner;


  


  


  public void draw(Graphics2D g2d) {


    int[] xOuter = new int[nPoints];


    int[] yOuter = new int[nPoints];


    int[] xInner = new int[nPoints];


    int[] yInner = new int[nPoints];


    


    double deltaAngle = Math.PI / nPoints;


    for (int i = 0; i < nPoints; i++) {


      double angle = deltaAngle + i * 2 * deltaAngle;


      int x = (int)(rOuter * Math.sin(angle));


      int y = (int)(rOuter * Math.cos(angle));


      xOuter[i] = this.x + x;


      yOuter[i] = this.y - y;


      


      x = (int)(rInner * Math.sin(angle + deltaAngle));


      y = (int)(rInner * Math.cos(angle + deltaAngle));


      xInner[i] = this.x + x;


      yInner[i] = this.y - y;


    }


    


    g2d.setColor(cOuter);


    g2d.fillPolygon(xOuter, yOuter, nPoints);


    


    g2d.setColor(cInner);


    g2d.fillPolygon(xInner, yInner, nPoints);


    


  }


}

运行代码，可以看到窗口中绘制了 5 个五边形的星星，并且每个星星的颜色都是随机的，并且在窗口中不停的闪烁着。

  
  

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