Question

为什么多边形我告诉我的程序显示。这是我调用的类的代码。

package rubiksCube;
/*class that contains my paint component*/
import java.awt.*;
import javax.swing.JPanel;
public class Display extends JPanel{
    Polygon[][] p = {{new Polygon(),new Polygon(),new Polygon()},
                    {new Polygon(),new Polygon(),new Polygon()},
                    {new Polygon(),new Polygon(),new Polygon()}};
    int[] rx = {0,0,0,0};
    int[] ry = {0,0,0,0};
    int rsN = 0;
    public void renderSide(int sN,int[] x,int[] y){
        rsN = sN;
        ry = y;
        rx = x;
    }
    public void paintComponent(Graphics g){
        g.clearRect(0, 0, 100, 100);
        for(int y = 0;y<3;y++){
            for(int x = 0;x<3;x++){
                System.out.print(x);
                System.out.println(y);
                g.setColor(getColor(Main.j[rsN][(y*3)+x]));
                p[y][x].addPoint((((rx[0]-rx[3])*(y/3)+rx[0])-((rx[1]-rx[2]))*(y/3)+rx[1])*(x/3)+((rx[0]-rx[3])*(y/3)+rx[0]),((((ry[0]-ry[3])*(x/3)+ry[0])-((ry[1]-ry[2]))*(x/3)+ry[1]))*(y/3)+((ry[0]-ry[3])*(x/3)+ry[0]));
                p[y][x].addPoint((((rx[0]-rx[3])*(y/3)+rx[0])-((rx[1]-rx[2]))*(y/3)+rx[1])*(x+1/3)+((rx[0]-rx[3])*(y/3)+rx[0]),((((ry[0]-ry[3])*(x/3)+ry[0])-((ry[1]-ry[2]))*(x/3)+ry[1])*(y/3))+((ry[0]-ry[3])*(x/3)+ry[0]));
                p[y][x].addPoint((((rx[0]-rx[3])*(y/3)+rx[0])-((rx[1]-rx[2]))*(y/3)+rx[1])*(x+1/3)+((rx[0]-rx[3])*(y/3)+rx[0]),((((ry[0]-ry[3])*(x/3)+ry[0])-((ry[1]-ry[2]))*(x/3)+ry[1]))*(y+1/3)+((ry[0]-ry[3])*(x/3)+ry[0]));
                p[y][x].addPoint((((rx[0]-rx[3])*(y/3)+rx[0])-((rx[1]-rx[2]))*(y/3)+rx[1])*(x/3)+((rx[0]-rx[3])*(y/3)+rx[0]),((((ry[0]-ry[3])*(x/3)+ry[0])-((ry[1]-ry[2]))*(x/3)+ry[1]))*(y+1/3)+((ry[0]-ry[3])*(x/3)+ry[0]));
                g.fillPolygon(p[y][x]);
            }
        }
    }
    public Color getColor(int i){
        switch(i){
            case 0:
            return Color.WHITE;
            case 1:
            return Color.GREEN;
            case 2:
            return Color.RED;
            case 3:
            return Color.YELLOW;
            case 4:
            return Color.BLUE;

        }
        return Color.ORANGE;
    }
}
//my main class
package rubiksCube;

import java.awt.Graphics;

import javax.swing.JFrame;

public class Main {

    public static int[][] j = {
            {0,0,0,0,0,0,0,0,0},
            {1,1,1,1,1,1,1,1,1},
            {2,2,2,2,2,2,2,2,2},
            {3,3,3,3,3,3,3,3,3},
            {4,4,4,4,4,4,4,4,4},
            {5,5,5,5,5,5,5,5,5}
    };
    public static void main(String args[]){
            SimpleGui s = new SimpleGui();
            Display d = new Display();
            int[] x = {0,100,100,0};
            int[] y = {0,0,100,100};
            d.renderSide(0,x,y);
            s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            s.pack();
            s.setSize(1000,700);
            s.setVisible(true);
            s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            s.pack();
            s.setSize(1000,1000);
            s.setVisible(true);

    }

}
    //and my gui class
package rubiksCube;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;


public class SimpleGui  extends JFrame{
        int[] px2;
        int[] py2;
        int[] pz2;
        Graphics g2 = null;
        int sN;


    public SimpleGui(){
        JButton solve = new JButton();
        JPanel p = new JPanel();
        solve.setText("Solve");
        solve.addActionListener(new ActionListener(){

        public void actionPerformed(ActionEvent e){
            Control c = new Control();
            c.solve();
        }});
        solve.addKeyListener(new KeyListener(){


            public void keyPressed(KeyEvent k) {
                switch (k.getKeyCode()){
                case KeyEvent.VK_DOWN:

                    break;
                case KeyEvent.VK_UP:

                    break;
                case KeyEvent.VK_LEFT:

                    break;
                case KeyEvent.VK_RIGHT:

                    break;
                case KeyEvent.VK_0:

                    break;
                case KeyEvent.VK_1:

                    break;
                case KeyEvent.VK_2:

                    break;
                case KeyEvent.VK_3:

                    break;
                case KeyEvent.VK_4:

                    break;
                case KeyEvent.VK_5:

                    break;
                case KeyEvent.VK_6:

                    break;
                case KeyEvent.VK_7:

                    break;
                case KeyEvent.VK_8:

                    break;
                case KeyEvent.VK_9:

                    break;
                case KeyEvent.VK_MINUS:

                    break;
                case KeyEvent.VK_EQUALS:

                    break;

                }


            }


            public void keyReleased(KeyEvent k) {


            }


            public void keyTyped(KeyEvent k) {


            }

        });
        JButton random = new JButton();
        random.setText("Randomize");
        random.addActionListener(new ActionListener(){

        public void actionPerformed(ActionEvent e){
            Control c = new Control();
            c.random();
        }});
        p.setVisible(true);
        p.setLayout(new GridBagLayout());
        solve.setVisible(true);
        random.setVisible(true);
        GridBagConstraints c = new GridBagConstraints();
        c.weightx = 1;
        c.weighty = 1;
        c.gridx = 0;
        c.gridy = 0;
        c.anchor = GridBagConstraints.FIRST_LINE_START;
        p.add(solve,c);
        c.anchor = GridBagConstraints.PAGE_START;
        c.gridx = 0;
        c.gridy = 0;
        p.add(random,c);
        c.anchor = GridBagConstraints.FIRST_LINE_START;
        c.gridx = 2;
        c.gridy = 2;
        JPanel d = new Display();
        d.setPreferredSize(new Dimension(100,100));
        p.add(d,c);
        add(p);
        setContentPane(p);
        setVisible(true);
    }}

当我说g.fillPolyon（p [y] [x]）时，有人可以解释一下;它不起作用？请帮助，谢谢。这是我的显示类的第23行。

Answer 1

不调用super.paintComponent会导致潜在问题
未提供Display的尺寸提示，可将其呈现为0x0
绘制图形时的位置与已绘制的组件具有上下文关系，即0x0的x / y位置是组件的左上角，指定可能超出大小的X / Y位置该组件不会被涂上

以下......

public static void main(String args[]) {
    SimpleGui s = new SimpleGui();
    Display d = new Display();
    int[] x = {0, 100, 100, 0};
    int[] y = {0, 0, 100, 100};
    d.renderSide(0, x, y);
    s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    s.setSize(1000, 700);
    s.setVisible(true);
}

有点没用，因为d实际上没有被添加到可以呈现它的任何东西

<强>更新

您需要进一步调试代码......

我添加了一些System.out.println语句来查看您正在创建的内容，这是输出...

---nxn是主for-loops。其后的每一系列数字都是Polygon

---0x0
0x0
0x0
0x0
0x0
---1x0
0x0
100x0
100x0
0x0
---2x0
0x0
200x0
200x0
0x0
---0x1
0x0
0x0
0x0
0x0
---1x1
0x0
100x0
100x0
0x0
---2x1
0x0
200x0
200x0
0x0
---0x2
0x0
0x0
0x0
0x0
---1x2
0x0
100x0
100x0
0x0
---2x2
0x0
200x0
200x0
0x0
---0x0
0x0
0x0
0x0
0x0
---1x0
0x0
100x0
100x0
0x0
---2x0
0x0
200x0
200x0
0x0
---0x1
0x0
0x0
0x0
0x0
---1x1
0x0
100x0
100x0
0x0
---2x1
0x0
200x0
200x0
0x0
---0x2
0x0
0x0
0x0
0x0
---1x2
0x0
100x0
100x0
0x0
---2x2
0x0
200x0
200x0
0x0

如果你仔细观察，你会看到你画的是直线（或空的多边形）。

您在p中声明和使用Display的方式也值得关注，因为您从未重置Polygon s，这意味着，在每次重新粉饰时，您都是只需在多边形中添加更多点。最好预先计算这个并简单地绘制结果 - 恕我直言

Java Gridbaglayout填充Polygon不显示？

1 个答案: