Java在绘制线条时使用jpanel和jscrollpane

时间：2013-01-22 10:20:52

标签： java swing user-interface jpanel jscrollpane

我开发了一个可视化连接Java组件的软件解决方案，它运行正常。我现在唯一的问题是我的仪表板被jscrollpane包围，这很好。但是如果我离开仪表板以便jscrollpane必须增长，那么绘制连接组件的所有线都会从它们的位置移动。我已经搜索了获取jscollpane真实屏幕大小的方法，但一无所获。

如果需要，我可以使用：

来增长jscrollpane 
Point p = (mainPanel.getMousePosition());
if(mainPanel.getWidth() - (p.x) < tmp.getWidth() && mainPanel.getHeight() - (p.y) < tmp.getHeight())
{
    dim = new Dimension(dim.width+(mainPanel.getWidth()-p.x),dim.height+mainPanel.getHeight() - (p.y));
}
else if(mainPanel.getHeight() - (p.y) < tmp.getHeight())
{
    dim = new Dimension(dim.width,dim.height+mainPanel.getHeight() - (p.y));
}
else if(mainPanel.getWidth() - (p.x) < tmp.getWidth())
{
    dim = new Dimension(dim.width+(mainPanel.getWidth()-p.x),dim.height);
}
mainPanel.setPreferredSize(dim);

拖动鼠标时。

所以我需要获取jscrollpane中左上角点的坐标来计算新的坐标或者使线条正确移回的东西。

绘制我使用的线条：

@Override
public void paint(Graphics g) {
    super.paint(g);
    Graphics2D g2d = (Graphics2D) g;

    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);

    // test
    Line2D tmp_line;
    for (int i = 0; i < abuttons.size(); i++) {
        // System.out.println(abuttons.get(i).out);
        if (abuttons.get(i).out != null) {
            int x1 = abuttons.get(i).getLocation().x
                    + abuttons.get(i).connectBtn_right.getLocation().x 
                    + 12;
            int y1 = abuttons.get(i).getLocation().y
                    + abuttons.get(i).connectBtn_right.getLocation().y 
                    + 9 + 75;
            int x2 = abuttons.get(i).out.getLocation().x
                    + abuttons.get(i).out.connectBtn_left.getLocation().x
                    + 12;
            int y2 = abuttons.get(i).out.getLocation().y
                    + abuttons.get(i).out.connectBtn_left.getLocation().y
                    + 9 + 75;

            tmp_line = new Line2D.Double(x1, y1, x2, y2);
            g2d.setPaint(Color.BLACK);
            g2d.setStroke(new BasicStroke(1.5f));
            g2d.draw(tmp_line);
        }
    }
    if (point1 != null && point2 != null) {
        line2d = new Line2D.Double(point1, point2);
        g2d.setPaint(Color.RED);
        g2d.setStroke(new BasicStroke(1.5f));// set stroke size
        g2d.draw(line2d);
    }
}

感谢您的帮助

这里是SSCCE：

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JScrollPane;
import javax.swing.JButton;


public class LineDraw extends JFrame {

private JPanel contentPane;
JScrollPane scrollPane = new JScrollPane();
JPanel panel = new JPanel();
JButton btnNewButton = new JButton("New button");
JButton btnNewButton_1 = new JButton("New button");

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                LineDraw frame = new LineDraw();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public LineDraw() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);

    scrollPane.setBounds(0, 0, 424, 251);
    contentPane.add(scrollPane);

    scrollPane.setViewportView(panel);
    panel.setLayout(null);

    btnNewButton.setBounds(27, 98, 89, 23);
    panel.add(btnNewButton);

    btnNewButton_1.setBounds(213, 137, 89, 23);
    panel.add(btnNewButton_1);
    initListener();
}

private void initListener()
{
    btnNewButton.addMouseMotionListener(new MouseAdapter() {
            @Override
            public void mouseDragged(MouseEvent me) {
                super.mouseDragged(me);
                Point pos = panel.getMousePosition();
                System.out.println(pos);
                if(panel.getWidth()-pos.x<50 && panel.getHeight()-pos.y<50)
                {
                    panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()+50));
                }
                else if(panel.getHeight()-pos.y<50)
                {
                    panel.setPreferredSize(new Dimension(panel.getWidth(),panel.getHeight()+50));
                }                   
                else if(panel.getWidth()-pos.x<50)
                {
                    panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()));
                }
                btnNewButton.setLocation(pos);
                repaint();
                validate();
            }
        });
    btnNewButton_1.addMouseMotionListener(new MouseAdapter() {
        @Override
        public void mouseDragged(MouseEvent me) {
            super.mouseDragged(me);
            Point pos = panel.getMousePosition();
            if(panel.getWidth()-pos.x<50 && panel.getHeight()-pos.y<50)
            {
                panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()+50));
            }
            else if(panel.getHeight()-pos.y<50)
            {
                panel.setPreferredSize(new Dimension(panel.getWidth(),panel.getHeight()+50));
            }                   
            else if(panel.getWidth()-pos.x<50)
            {
                panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()));
            }
            btnNewButton_1.setLocation(panel.getMousePosition());
            repaint();
            validate();
        }
    });
}

@Override
public void paint(Graphics g)
{
    super.paint(g);
    g.drawLine(btnNewButton.getLocation().x+10,btnNewButton.getLocation().y+32, btnNewButton_1.getLocation().x+10,btnNewButton_1.getLocation().y+32);
}
}

1 个答案:

答案 0 :(得分：4)

paintComponent() panel的{​​{1}}，而不是paint()的{​​{1}} 

JFrame

完全删除import javax.swing.*; import javax.swing.border.EmptyBorder; import java.awt.*; import java.awt.event.*; public class LineDraw extends JFrame { private JPanel contentPane; JScrollPane scrollPane = new JScrollPane(); JPanel panel = new JPanel(){ @Override public void paintComponent(Graphics g) { super.paintComponent(g); g.drawLine(btnNewButton.getLocation().x,btnNewButton.getLocation().y, btnNewButton_1.getLocation().x,btnNewButton_1.getLocation().y); } }; JButton btnNewButton = new JButton("New button"); JButton btnNewButton_1 = new JButton("New button"); /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { LineDraw frame = new LineDraw(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public LineDraw() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); scrollPane.setBounds(0, 0, 424, 251); contentPane.add(scrollPane); scrollPane.setViewportView(panel); panel.setLayout(null); btnNewButton.setBounds(27, 98, 89, 23); panel.add(btnNewButton); btnNewButton_1.setBounds(213, 137, 89, 23); panel.add(btnNewButton_1); initListener(); } private void initListener() { btnNewButton.addMouseMotionListener(new MouseAdapter() { @Override public void mouseDragged(MouseEvent me) { super.mouseDragged(me); Point pos = panel.getMousePosition(); System.out.println(pos); if(panel.getWidth()-pos.x<50 && panel.getHeight()-pos.y<50) { panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()+50)); } else if(panel.getHeight()-pos.y<50) { panel.setPreferredSize(new Dimension(panel.getWidth(),panel.getHeight()+50)); } else if(panel.getWidth()-pos.x<50) { panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight())); } btnNewButton.setLocation(pos); validate(); repaint(); } }); btnNewButton_1.addMouseMotionListener(new MouseAdapter() { @Override public void mouseDragged(MouseEvent me) { super.mouseDragged(me); Point pos = panel.getMousePosition(); if(panel.getWidth()-pos.x<50 && panel.getHeight()-pos.y<50) { panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()+50)); } else if(panel.getHeight()-pos.y<50) { panel.setPreferredSize(new Dimension(panel.getWidth(),panel.getHeight()+50)); } else if(panel.getWidth()-pos.x<50) { panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight())); } btnNewButton_1.setLocation(panel.getMousePosition()); validate(); repaint(); } }); } } 方法。

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