允许用户在图像上手写标记 - Java、Swing

Question

我正在使用 Java、Swing 开发一个应用程序。它将主要用于研究用于医学目的的五角星波形图。希望用户可以在图像上做笔记（大概类似于 Window 的油漆中使用的铅笔）。

请记住，每次用户加载图像时，都会附加以下鼠标运动侦听器（为了使图像可拖动以提高可用性）：

public class DragMouseListener implements MouseMotionListener {

    JLabel jl;
    int imageX, imageY;

    public DragMouseListener(JLabel jlabel) {
        this.jl = jlabel;
        jl.addMouseMotionListener(this);
    }


    @Override
    public void mouseDragged(MouseEvent e) {
        updateImagePosition(e);
    }

    @Override
    public void mouseMoved(MouseEvent e) {
    }

    private void updateImagePosition(MouseEvent e) {
        imageX = e.getX();
        imageY = e.getY();
        jl.setLocation(imageX, imageY);
    }
}

到目前为止，我什至无法接近实现它的方法，而且我在 Internet 上找不到任何有关该问题的参考资料。任何帮助（甚至是粗略的想法）将不胜感激。提前致谢。

尼克

Answer 1

我尝试了您要求的DragMouseListener，但发现它非常不舒服，因此使用JInternal Frame 它工作正常（但您仍然可以在 JInternal Frame 中拖动图像，因为我实现了您的要求）。免手写，我使用了JEditorPane（如果你愿意，你可以添加手写的东西，但这会很乱）和可访问的父 JScrollPane，这样你就可以输入你想要的数量。

您可以轻松拖动 JInternal Frame：

注意：我为此使用了 NetBeans GUI Builder，并建议您也使用任何 GUI Builder，因为它使 打字工作轻松。

代码如下：

import java.awt.event.MouseEvent;

public class Move extends javax.swing.JFrame {

public Move() {
    initComponents();
}

@SuppressWarnings("unchecked")

private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jInternalFrame1 = new javax.swing.JInternalFrame();
    jLabel1 = new javax.swing.JLabel();
    jScrollPane1 = new javax.swing.JScrollPane();
    jEditorPane1 = new javax.swing.JEditorPane();
    jInternalFrame2 = new javax.swing.JInternalFrame();
    jLabel2 = new javax.swing.JLabel();
    jScrollPane2 = new javax.swing.JScrollPane();
    jEditorPane2 = new javax.swing.JEditorPane();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jPanel1.setBackground(new java.awt.Color(0, 0, 0));

    jInternalFrame1.setVisible(true);

    jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images.jpg"))); // NOI18N
    jLabel1.setText("jLabel1");
    jLabel1.addComponentListener(new java.awt.event.ComponentAdapter() {
        public void componentMoved(java.awt.event.ComponentEvent evt) {
            jLabel1ComponentMoved(evt);
        }
    });
    jLabel1.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
        public void mouseDragged(java.awt.event.MouseEvent evt) {
            jLabel1MouseDragged(evt);
        }
    });

    jScrollPane1.setViewportView(jEditorPane1);

    javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
    jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
    jInternalFrame1Layout.setHorizontalGroup(
        jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jInternalFrame1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 203, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel1, 0, 0, Short.MAX_VALUE))
            .addContainerGap())
    );
    jInternalFrame1Layout.setVerticalGroup(
        jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jInternalFrame1Layout.createSequentialGroup()
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 38, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 250, Short.MAX_VALUE)
            .addContainerGap())
    );

    jInternalFrame2.setVisible(true);

    jLabel2.setIcon(new javax.swing.ImageIcon("E:\\untitled.png")); // NOI18N
    jLabel2.setText("jLabel2");

    jScrollPane2.setViewportView(jEditorPane2);

    javax.swing.GroupLayout jInternalFrame2Layout = new javax.swing.GroupLayout(jInternalFrame2.getContentPane());
    jInternalFrame2.getContentPane().setLayout(jInternalFrame2Layout);
    jInternalFrame2Layout.setHorizontalGroup(
        jInternalFrame2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jInternalFrame2Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jInternalFrame2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 222, Short.MAX_VALUE)
                .addComponent(jLabel2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 222, Short.MAX_VALUE))
            .addContainerGap())
    );
    jInternalFrame2Layout.setVerticalGroup(
        jInternalFrame2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jInternalFrame2Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jLabel2)
            .addContainerGap(40, Short.MAX_VALUE))
    );

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jInternalFrame1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(177, 177, 177)
            .addComponent(jInternalFrame2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(71, Short.MAX_VALUE))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
            .addGap(49, 49, 49)
            .addComponent(jInternalFrame1)
            .addGap(209, 209, 209))
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGap(31, 31, 31)
            .addComponent(jInternalFrame2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(166, Short.MAX_VALUE))
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );

    pack();
}

private void jLabel1ComponentMoved(java.awt.event.ComponentEvent evt) {


}

private void jLabel1MouseDragged(java.awt.event.MouseEvent evt) {
   updateImagePosition(evt);

}
private void updateImagePosition(MouseEvent evt) {
   int imageX = evt.getX();
 int   imageY = evt.getY();
    jLabel1.setLocation(imageX, imageY);
}
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Move().setVisible(true);
        }
    });
}


private javax.swing.JEditorPane jEditorPane1;
private javax.swing.JEditorPane jEditorPane2;
private javax.swing.JInternalFrame jInternalFrame1;
private javax.swing.JInternalFrame jInternalFrame2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;


}

更新：

请参阅 @mKorbel 和 @trashgod 回答的 This 帖子，以使 JInternal 框架最小化/最大化和调整大小。很棒的答案。