Repaint(aneb kresleni v jPanelu) – Java – Fórum – Programujte.com

zdravim, mam taky problem. Snazim se udelat graficky joystick v jave. Vsechno v poradku jen je tu takovej detail kdyz menim pozici mysi. Po kazde zmene pozice volam repaint(). Ale i tak obcas na jPanelu zustavaji nejakou chvili vykreslene stare pozice.

package MainFrame;



public class NewJFrame extends javax.swing.JFrame {



    public NewJFrame() {

        initComponents();

    }



    @SuppressWarnings("unchecked")

    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          

    private void initComponents() {



        jLabel1 = new javax.swing.JLabel();

        jLabel2 = new javax.swing.JLabel();

        controlPanel1 = new MainFrame.ControlPanel();



        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);



        jLabel1.setText("jLabel1");



        jLabel2.setText("jLabel2");



        controlPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));

        controlPanel1.addMouseListener(new java.awt.event.MouseAdapter() {

            public void mouseReleased(java.awt.event.MouseEvent evt) {

                controlPanel1MouseReleased(evt);

            }

        });

        controlPanel1.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {

            public void mouseDragged(java.awt.event.MouseEvent evt) {

                controlPanel1MouseDragged(evt);

            }

        });



        javax.swing.GroupLayout controlPanel1Layout = new javax.swing.GroupLayout(controlPanel1);

        controlPanel1.setLayout(controlPanel1Layout);

        controlPanel1Layout.setHorizontalGroup(

            controlPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGap(0, 300, Short.MAX_VALUE)

        );

        controlPanel1Layout.setVerticalGroup(

            controlPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGap(0, 300, Short.MAX_VALUE)

        );



        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

        getContentPane().setLayout(layout);

        layout.setHorizontalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(layout.createSequentialGroup()

                .addContainerGap()

                .addComponent(controlPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addGap(82, 82, 82)

                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                    .addComponent(jLabel1)

                    .addComponent(jLabel2))

                .addContainerGap(202, Short.MAX_VALUE))

        );

        layout.setVerticalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(layout.createSequentialGroup()

                .addContainerGap()

                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                    .addComponent(controlPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addGroup(layout.createSequentialGroup()

                        .addComponent(jLabel1)

                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

                        .addComponent(jLabel2)))

                .addContainerGap(256, Short.MAX_VALUE))

        );



        pack();

    }// </editor-fold>                        



    private void controlPanel1MouseDragged(java.awt.event.MouseEvent evt) {                                           

        jLabel1.setText(Integer.toString(evt.getX()));

        jLabel2.setText(Integer.toString(evt.getY()));

        controlPanel1.setxPosition(evt.getX());

        controlPanel1.setyPosition(evt.getY());

        controlPanel1.repaint();

    }                                          



    private void controlPanel1MouseReleased(java.awt.event.MouseEvent evt) {                                            

        controlPanel1.setxPosition(142);

        controlPanel1.setyPosition(142);

        jLabel1.setText(Integer.toString(150));

        jLabel2.setText(Integer.toString(150));

        controlPanel1.repaint();

    }                                           



    public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(new Runnable() {



            public void run() {

                new NewJFrame().setVisible(true);

            }

        });

    }

    // Variables declaration - do not modify                     

    private MainFrame.ControlPanel controlPanel1;

    private javax.swing.JLabel jLabel1;

    private javax.swing.JLabel jLabel2;

    // End of variables declaration                   

}

package MainFrame;



import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JPanel;



public class ControlPanel extends JPanel {



    public int xPosition = 142;

    public int yPosition = 142;



    public int getxPosition() {

        return xPosition;

    }



    public void setxPosition(int xPosition) {

        this.xPosition = xPosition;

    }



    public int getyPosition() {

        return yPosition;

    }



    public void setyPosition(int yPosition) {

        this.yPosition = yPosition;

    }



    public ControlPanel() {

        this.setSize(300, 300);

        this.setBackground(Color.black);

        this.setVisible(true);

    }



    @Override

    public void paint(Graphics g) {

        g.setColor(Color.red);

        g.drawLine(0, 150, 300, 150);

        g.drawLine(150, 0, 150, 300);

        g.fillOval(xPosition, yPosition, 16, 16);

    }

}

co tak koukam nikde to nemazes, samo se to za tebe nesmaze. dej fill oblasti v background barve

mno kdyz dam fill neprida to jeste k tomu ?? jako dalsi vrstvu ??

ja ti nevim jsem uz dneska nejakej unavenej... jen jsem nahore chtel rict ze si samozrejme jpanel na zacatku kazdeho kresleni mazu pomoci fill, kdyz najdes lepsi zpusob, necht ti slouzi...

Tak ti povim . Jednoduche ale efektni reseni klobouk dolu :D