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); 
    } 
} 

^這是圖Panel類

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)); 
    } 
} 

這是風扇類

目前，我試圖讓風扇的圖片顯示在屏幕上並想知道是否有辦法讓它在同一個地方同時畫圓弧和橢圓？我一直在搞圖形面板類，但我不太清楚如何將ARC true與OVAL合併。幫助將不勝感激謝謝

Answer 1

在fill分支case ARC的末尾添加drawOval()：

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

還要考慮RenderingHints：

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