Question

我试图在java applet中绘制一些有随机内插的条形图但是覆盖有一个错误即时通讯java我试图在代码中使用两个区域绘制方法最底层另一个是第二个面板区域我的目标是什么

尺寸x，y不是坐标

-total size = 200,250

-location gui = 200,50

-image = 140,150

-precip = 100,20

-temp = 20,100

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import java.util.*;

public class Final2 extends JFrame
{
    //Panels
    JPanel locationGui = new JPanel ();
    JPanel temp = new JPanel ();
    JPanel percip = new JPanel ();
    JPanel image = new JPanel ();
    //Location gui components
    JButton Enter, Exit;
    JTextField location;
    JLabel city;
    JRadioButton time;
    JComboBox Seasons;
    //bar # genertor
    Random rand = new Random ();
    int P = rand.nextInt (100) + 1; //Random Precipitation
    int H = rand.nextInt (50) + 1; //Random Heat
    public Final2 ()
    {
        init ();

    }


    public void init ()
    {
        Font font = new Font ("impact", Font.PLAIN, 20);
        //________________________________________________new panel____________________
        locationGui.setBackground (Color.RED);
        JLabel guiLabel = new JLabel ("");
        guiLabel.setFont (font);

        Enter = new JButton ("Enter");
        Exit = new JButton ("exit");



        city = new JLabel ("What city?");
        location = new JTextField (20); //location entry field


        Seasons = new JComboBox ();
        Seasons.addItem ("Summer");
        Seasons.addItem ("Fall");
        Seasons.addItem ("Winter");
        Seasons.addItem ("Spring");


        time = new JRadioButton ("check if night?");


        locationGui.add (city);
        locationGui.add (location);
        locationGui.add (Seasons);
        locationGui.add (time);



        locationGui.add (guiLabel);


        //________________________________________________new panel____________________
        temp.setBackground (Color.BLUE);
        temp.setLayout (new GridBagLayout ());
        JLabel tempLabel = new JLabel ("Temp");
        tempLabel.setFont (font);
        temp.add (tempLabel);

        //________________________________________________new panel____________________
        percip.setBackground (Color.GREEN);
        JLabel pLabel = new DrawingPanel (); //where it should be

        percip.add (pLabel);

        //________________________________________________new panel____________________
        image.setBackground (Color.ORANGE);
        image.setLayout (new GridBagLayout ());
        JLabel imageLabel = new JLabel ("Image");
        imageLabel.setFont (font);
        image.add (imageLabel);

        Container contentPane = getContentPane ();

        contentPane.setLayout (new BorderLayout ());
        contentPane.add (locationGui, BorderLayout.NORTH);
        contentPane.add (temp, BorderLayout.EAST);
        contentPane.add (percip, BorderLayout.SOUTH);
        contentPane.add (image, BorderLayout.CENTER);

        setContentPane (contentPane);
        setDefaultCloseOperation (EXIT_ON_CLOSE);
        setSize (400, 400);
        setLocationRelativeTo (null);
        setVisible (true);
    }


    public static void main (String[] args)
    {
        SwingUtilities.invokeLater (new Runnable ()

        {


            public void run ()
            {
                new Final2 ();
            }
        }


        );
    }


    private class DrawingPanel extends javax.swing.JPanel {//area i have issues with atm
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        drawPercip(g);
    }
    @Override 
    public Dimension getPreferredSize() {
        return new Dimension(200, 400);
    }



    }


    public void drawPercip (Graphics g)
    {
        //Precipitation Bar
        g.setColor (Color.black);
        g.drawRect (40, 170, 100, 20); //outline of bar
        g.setColor (Color.blue);
        g.fillRect (40 + 1, 170 + 4, P, 14); //indicator bar (+4 puts space beetween outline bar)
    }


    public void drawTemp (Graphics g)
    {
        //Temparature Bar
        g.setColor (Color.red);
        g.fillRect (170 + 4, 50, 14, 100); //Covers in
        g.setColor (Color.black);
        g.drawRect (170, 50, 20, 100); //outline of bar
        g.setColor (Color.white);
        g.fillRect (170 + 4, 50 + 1, 16, 100 - H); //indicator bar (+4 puts space beetween outline bar)
    }




}

我当前的错误（4）发生在@override的这段代码中，唯一提供的消息是“非法令牌”和“忽略意外符号”idk为什么它不提供更多信息

 private class DrawingPanel extends javax.swing.JPanel {//area i have issues with atm
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        drawPercip(g);
    }
    @Override 
    public Dimension getPreferredSize() {
        return new Dimension(200, 400);
    }

Answer 1

首先我没见过小程序，

其次，DrawingPanel不是JLabel

JLabel pLabel = new DrawingPanel(); //where it should be

将pLable类型更改为JComponent或JPanel或DrawingPanel，具体取决于您希望能够从每个班级访问的内容。

第三，你不应该依赖魔术数字

public void drawPercip(Graphics g) {
    //Precipitation Bar
    g.setColor(Color.black);
    g.drawRect(40, 170, 100, 20); //outline of bar
    g.setColor(Color.blue);
    g.fillRect(40 + 1, 170 + 4, P, 14); //indicator bar (+4 puts space beetween outline bar)
}

public void drawTemp(Graphics g) {
    //Temparature Bar
    g.setColor(Color.red);
    g.fillRect(170 + 4, 50, 14, 100); //Covers in
    g.setColor(Color.black);
    g.drawRect(170, 50, 20, 100); //outline of bar
    g.setColor(Color.white);
    g.fillRect(170 + 4, 50 + 1, 16, 100 - H); //indicator bar (+4 puts space beetween outline bar)
}

无法保证面板的高度和宽度符合您的想象。使用getWidth和getHeight方法

第四，如果你打算拥有更多DrawingPanel，你应该

int P = rand.nextInt(100) + 1; //Random Precipitation
int H = rand.nextInt(50) + 1; //Random Heat

DrawingPanel。

的一部分

您还应该花时间阅读Code Conventions for the Java Programming Language

将图形（g）绘制到jpanel中

1 个答案: