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POJava working with jpanel and jscrollpane while drawing lines
 

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  1. POJava working with jpanel and jscrollpane while drawing lines
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    <p>I developed a software solution to connect Java components visually and it works fine. My only problem now is that my dashboard is surrounded by a jscrollpane and thats good. But if i get out of the dashboard so that the jscrollpane have to grow, all the lines drawed to connect the components are moving from they position. I have search for methods to get the real screen size of the jscollpane but found nothing. </p> <p>To grow the jscrollpane if needed i use:</p> <pre><code>Point p = (mainPanel.getMousePosition()); if(mainPanel.getWidth() - (p.x) &lt; tmp.getWidth() &amp;&amp; mainPanel.getHeight() - (p.y) &lt; tmp.getHeight()) { dim = new Dimension(dim.width+(mainPanel.getWidth()-p.x),dim.height+mainPanel.getHeight() - (p.y)); } else if(mainPanel.getHeight() - (p.y) &lt; tmp.getHeight()) { dim = new Dimension(dim.width,dim.height+mainPanel.getHeight() - (p.y)); } else if(mainPanel.getWidth() - (p.x) &lt; tmp.getWidth()) { dim = new Dimension(dim.width+(mainPanel.getWidth()-p.x),dim.height); } mainPanel.setPreferredSize(dim); </code></pre> <p>While the mouse is dragged. </p> <p>So i need to get the coordinates of the left top point in the jscrollpane to calculate the new coordinates or something that shifts the lines correct back.</p> <p>To draw the lines i use:</p> <pre><code>@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 &lt; 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 &amp;&amp; point2 != null) { line2d = new Line2D.Double(point1, point2); g2d.setPaint(Color.RED); g2d.setStroke(new BasicStroke(1.5f));// set stroke size g2d.draw(line2d); } } </code></pre> <p>Thanks for any help</p> <p>Here the SSCCE:</p> <pre><code>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&lt;50 &amp;&amp; panel.getHeight()-pos.y&lt;50) { panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()+50)); } else if(panel.getHeight()-pos.y&lt;50) { panel.setPreferredSize(new Dimension(panel.getWidth(),panel.getHeight()+50)); } else if(panel.getWidth()-pos.x&lt;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&lt;50 &amp;&amp; panel.getHeight()-pos.y&lt;50) { panel.setPreferredSize(new Dimension(panel.getWidth()+50,panel.getHeight()+50)); } else if(panel.getHeight()-pos.y&lt;50) { panel.setPreferredSize(new Dimension(panel.getWidth(),panel.getHeight()+50)); } else if(panel.getWidth()-pos.x&lt;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); } } </code></pre>
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    1. USKingalione
    1. USKingalione
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COfor better help sooner post an [SSCCE](http://sscce.org/), short, runnable, compilable
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      1. POJava working with jpanel and jscrollpane while drawing lines
      1. USmKorbel
    2. COThe fact that you are in a scrollpane should be transparent for you. But honestly, I don't understand your question.
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      1. POJava working with jpanel and jscrollpane while drawing lines
      1. USGuillaume Polet
    3. COHave you ever heard of `LayoutManager`'s? It will make your life a lot simpler, instead of having to write code such as `contentPane.setLayout(null);scrollPane.setBounds(0, 0, 424, 251);btnNewButton.setBounds(27, 98, 89, 23); btnNewButton_1.setBounds(213, 137, 89, 23);`...
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      1. POJava working with jpanel and jscrollpane while drawing lines
      1. USGuillaume Polet
 

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