Question

我一直在做一个项目。在项目的一部分，我需要利用JPanel。 Graphics2D对象被传递给框架的模型部分，模型将绘制在该实例处绘制的任何内容。问题是JFrame未正确呈现。它看起来是半白色阴影，没有正确绘画。它在我的笔记本电脑（Sony Vaio，Windows7）上工作正常，但它在我测试的所有其他系统中都没有正确呈现（2台戴尔笔记本电脑，Windows8; 1台Thoshiba，Windows7; 1台三星，Windows8）。它也可以在我的队友测试的其他几个系统上正确呈现。

我确信模型部件没有出错。问题似乎没有在JPanel上呈现。但我能提供的一个信息是，我们正在Netbeans中开展我们的项目。也许Netbeans IDE生成的代码导致了这个问题？我检查了代码但无法识别问题。为此发布SSCCE很困难，但我会分享一些问题的屏幕截图。

好的，因为我没有足够的声誉来发布图片，请看下面的链接....

[Displays Wrongly][1]
   [Displays Wrongly][2]
   [Displays correctly on my system][3]
   [Displays Correctly on my system][4]

我试图调试它但不知道问题是什么.... 的更新它不是SSCCE，但它可能有所帮助

JFrame的代码....

<pre>

import btapp.Question;
import btapp.qGens.QGenGeomAbstract;
import btapp.qGens.QGenI;
import java.awt.Graphics;
import java.util.ArrayList;
import javax.swing.JPanel;

public class UItestGeomFrame extends javax.swing.JFrame implements UIFrameI, UIGeomFrameAbstract {

    /**
     * Creates new form UItestGeomFrame
     */
    public UItestGeomFrame() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        unitTestGeomPanel1 = new btapp.ui.UnitTestGeomPanel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Draw Panel JUnitTestCase");

        unitTestGeomPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));

        javax.swing.GroupLayout unitTestGeomPanel1Layout = new javax.swing.GroupLayout(unitTestGeomPanel1);
        unitTestGeomPanel1.setLayout(unitTestGeomPanel1Layout);
        unitTestGeomPanel1Layout.setHorizontalGroup(
            unitTestGeomPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 406, Short.MAX_VALUE)
        );
        unitTestGeomPanel1Layout.setVerticalGroup(
            unitTestGeomPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 260, 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(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(160, Short.MAX_VALUE)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 263, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(142, 142, 142))
            .addGroup(layout.createSequentialGroup()
                .addGap(76, 76, 76)
                .addComponent(unitTestGeomPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addGap(30, 30, 30)
                .addComponent(unitTestGeomPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(UItestGeomFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(UItestGeomFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(UItestGeomFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(UItestGeomFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new UItestGeomFrame().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JLabel jLabel1;
    private btapp.ui.UnitTestGeomPanel unitTestGeomPanel1;
    // End of variables declaration                   

    @Override
    public void presentQuestions(Question qO, int qNo) {
        ArrayList qd = qO.getQuestionDraw();
        unitTestGeomPanel1.setQObject(qd);
        unitTestGeomPanel1.repaint();

    }

    @Override
    public void presentAnswers(Question qO, int qNo) {
        ArrayList ad = qO.getAnswerDraw();
        unitTestGeomPanel1.setQObject(ad);
        unitTestGeomPanel1.repaint();
    }

    @Override
    public void presentQuestions(Question qO, int qNo, QGenI qg) {
        unitTestGeomPanel1.setqGen(qg, qO, 0);
        unitTestGeomPanel1.repaint();
    }

    @Override
    public void presentAnswers(Question qO, int qNo, QGenI qg) {
        unitTestGeomPanel1.setqGen(qg, qO, 1);
        unitTestGeomPanel1.repaint();
    }


    @Override
    public int getHeight(){
        return unitTestGeomPanel1.getHeight();
    }

    @Override
    public int getWidth(){
        return unitTestGeomPanel1.getWidth();
    }

}
</pre>

JPanel代码


    import btapp.Question;
    import btapp.qGens.QGenGeomAbstract;
    import btapp.qGens.QGenI;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.Shape;
    import static java.awt.image.ImageObserver.HEIGHT;
    import static java.awt.image.ImageObserver.WIDTH;
    import java.util.ArrayList;


    public class UnitTestGeomPanel extends javax.swing.JPanel {
        private int type;

        /**
         * Creates new form UnitTestGeomPanel
         */
        public UnitTestGeomPanel() {
            initComponents();
        }

        /**
         * This method is called from within the constructor to initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is always
         * regenerated by the Form Editor.
         */
        @SuppressWarnings("unchecked")
        //                           
        private void initComponents() {

            javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
            this.setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 400, Short.MAX_VALUE)
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 300, Short.MAX_VALUE)
            );
        }//                         
        // Variables declaration - do not modify                     
        // End of variables declaration                   
        ArrayList dAL = new ArrayList();
        private double h, w;

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            System.out.println("repainign based on QO object of type "+type);

            if(type == 0){
                qg.presentQuestions(qO, (Graphics2D)g);
            }
            else
                if(type == 1)
                    qg.presentAnswers(qO, (Graphics2D)g);
                }

        void setQObject(ArrayList dAL) {
            this.dAL = dAL;
        }

        QGenI qg;
        Question qO;

        void setqGen(QGenI qg, Question qO, int type) {
            this.qO = qO;
            this.qg = qg;
            this.type = type;
        }
    }

请帮帮我... 提前致谢

修改几天后，我的系统也会出现问题，但情况并不会更糟。请参阅评论中的图片。

Answer 1

我遇到了同样的问题，因此我将显示设置更改为高性能并解决了问题（在Windows 8和Java 1.8中）。

enter image description here

Java Swing无法正确渲染

1 个答案: