配售球迷

Question

import java.awt.*; 
import javax.swing.JPanel; 

public class FigurePanel extends JPanel { 
    // Define constants 
    public static final int LINE = 1; 
    public static final int RECTANGLE = 2; 
    public static final int ROUND_RECTANGLE = 3; 
    public static final int OVAL = 4; 
    public static final int ARC = 5; 
    public static final int POLYGON = 6; 

    private int type = 1; 
    private boolean filled; 

    /** Construct a default FigurePanel */ 
    public FigurePanel() { 
    } 

    /** Construct a FigurePanel with the specified type */ 
    public FigurePanel(int type) { 
    this.type = type; 
    } 

    /** Construct a FigurePanel with the specified type and filled */ 
    public FigurePanel(int type, boolean filled) { 
    this.type = type; 
    this.filled = filled; 
    } 

    /** Draw a figure on the panel */ 
    public void paintComponent(Graphics g) { 
    super.paintComponent(g); 

    // Get the appropriate size for the figure 
    int width = getSize().width; 
    int height = getSize().height; 

    switch (type) { 
     case LINE: // Display two cross lines 
     g.setColor(Color.BLACK); 
     g.drawLine(10, 10, width - 10, height - 10); 
     g.drawLine(width - 10, 10, 10, height - 10); 
     break; 
     case RECTANGLE: // Display a rectangle 
     g.setColor(Color.BLUE); 
     if (filled) 
      g.fillRect((int)(0.1 * width), (int)(0.1 * height), 
      (int)(0.8 * width), (int)(0.8 * height)); 
     else 
      g.drawRect((int)(0.1 * width), (int)(0.1 * height), 
      (int)(0.8 * width), (int)(0.8 * height)); 
     break; 
     case ROUND_RECTANGLE: // Display a round-cornered rectangle 
     g.setColor(Color.RED); 
     if (filled) 
      g.fillRoundRect((int)(0.1 * width), (int)(0.1 * height), 
      (int)(0.8 * width), (int)(0.8 * height), 20, 20); 
     else 
      g.drawRoundRect((int)(0.1 * width), (int)(0.1 * height), 
      (int)(0.8 * width), (int)(0.8 * height), 20, 20); 
     break; 
     case OVAL: // Display an oval 
     g.setColor(Color.BLACK); 
     if (filled) 
      g.fillOval((int)(0.1 * width), (int)(0.1 * height), 
      (int)(0.8 * width), (int)(0.8 * height)); 
     else 
      g.drawOval((int)(0.1 * width), (int)(0.1 * height), 
      (int)(0.8 * width), (int)(0.8 * height)); 
     break; 
     case ARC: // Display an arc 
     g.setColor(Color.BLACK); 
     if (filled) { 
      int xCenter = getWidth()/2; 
      int yCenter = getHeight()/2; 
      int radius = 
      (int)(Math.min(getWidth(), getHeight()) * 0.4); 

      int x = xCenter - radius; 
      int y = yCenter - radius; 

      g.fillArc(x, y, 2 * radius, 2 * radius, 0, 30); 
      g.fillArc(x, y, 2 * radius, 2 * radius, 90, 30); 
      g.fillArc(x, y, 2 * radius, 2 * radius, 180, 30); 
      g.fillArc(x, y, 2 * radius, 2 * radius, 270, 30); 
     } 
     else { 
      int xCenter = getWidth()/2; 
      int yCenter = getHeight()/2; 
      int radius = 
      (int)(Math.min(getWidth(), getHeight()) * 0.4); 

      int x = xCenter - radius; 
      int y = yCenter - radius; 

      g.drawArc(x, y, 2 * radius, 2 * radius, 0, 30); 
      g.drawArc(x, y, 2 * radius, 2 * radius, 90, 30); 
      g.drawArc(x, y, 2 * radius, 2 * radius, 180, 30); 
      g.drawArc(x, y, 2 * radius, 2 * radius, 270, 30); 
     }; 
     break; 
     case POLYGON: // Display a polygon 
     g.setColor(Color.BLACK); 
     int xCenter = getWidth()/2; 
     int yCenter = getHeight()/2; 
     int radius = 
      (int)(Math.min(getWidth(), getHeight()) * 0.4); 

     // Create a Polygon object 
     Polygon polygon = new Polygon(); 

     // Add points to the polygon 
     polygon.addPoint(xCenter + radius, yCenter); 
     polygon.addPoint((int)(xCenter + radius * 
      Math.cos(2 * Math.PI/6)), (int)(yCenter - radius * 
      Math.sin(2 * Math.PI/6))); 
     polygon.addPoint((int)(xCenter + radius * 
      Math.cos(2 * 2 * Math.PI/6)), (int)(yCenter - radius * 
      Math.sin(2 * 2 * Math.PI/6))); 
     polygon.addPoint((int)(xCenter + radius * 
      Math.cos(3 * 2 * Math.PI/6)), (int)(yCenter - radius * 
      Math.sin(3 * 2 * Math.PI/6))); 
     polygon.addPoint((int)(xCenter + radius * 
      Math.cos(4 * 2 * Math.PI/6)), (int)(yCenter - radius * 
      Math.sin(4 * 2 * Math.PI/6))); 
     polygon.addPoint((int)(xCenter + radius * 
      Math.cos(5 * 2 * Math.PI/6)), (int)(yCenter - radius * 
      Math.sin(5 * 2 * Math.PI/6))); 

     // Draw the polygon 
     if (filled) 
      g.fillPolygon(polygon); 
     else 
      g.drawPolygon(polygon); 
    } 
    } 

    /** Set a new figure type */ 
    public void setType(int type) { 
    this.type = type; 
    // repaint(); 
    } 

    /** Return figure type */ 
    public int getType() { 
    return type; 
    } 

    /** Set a new filled property */ 
    public void setFilled(boolean filled) { 
    this.filled = filled; 
    repaint(); 
    } 

    /** Check if the figure is filled */ 
    public boolean isFilled() { 
    return filled; 
    } 

    /** Specify preferred size */ 
    public Dimension getPreferredSize() { 
    return new Dimension(80, 80); 
    } 
} 

^这是图Panel类

import java.awt.*; 
import javax.swing.*; 

public class fan extends JFrame { 
    public static void main(String[] args) { 
    JFrame frame = new fan(); 
    frame.setSize(300, 300); 
    frame.setTitle("Exercise13_09"); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.setLocationRelativeTo(null); // Center the frame 
    frame.setVisible(true); 
    } 

    public fan() { 
    setLayout(new GridLayout(2, 2)); 
    add(new FigurePanel(FigurePanel.ARC, true)); 
    add(new FigurePanel(FigurePanel.OVAL)); 
    add(new FigurePanel(FigurePanel.ARC, true)); 
    add(new FigurePanel(FigurePanel.OVAL, true)); 
    } 
} 

这是风扇类

目前，我试图让风扇的图片显示在屏幕上并想知道是否有办法让它在同一个地方同时画圆弧和椭圆？我一直在搞图形面板类，但我不太清楚如何将ARC true与OVAL合并。帮助将不胜感激谢谢

Answer 1

在fill分支case ARC的末尾添加drawOval()：

g.drawOval(x, y, 2 * radius, 2 * radius); 

还要考虑RenderingHints：

Graphics2D g2d = (Graphics2D) g; 
g2d.setRenderingHint(
    RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);