移动一个椭圆形跟随光标的java

我想一些建议：移动一个椭圆形跟随光标的java

我正在学习如何使用Swing和我有一个建议，使一个应用程序，用户可以从一个组合框JPanel的背景的选择的分配新建分配FY颜色（实现为定制梁）。我们还有其他组合框来选择形状的颜色。用户需要移动光标并观察它后面的五个椭圆。然后我完成了所有的界面，并且我学会了如何使用定时器每隔100毫秒重新绘制画布。

接口：

那么，如何能够存储椭圆形的持续五个位置？我的代码：

基本框架：

import java.awt.Color; 
import java.awt.geom.Point2D; 
import java.lang.reflect.Field; 


public class Frame extends javax.swing.JFrame { 



    public Frame() { 
     initComponents(); 
    } 


    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code">       
    private void initComponents() { 

     chooseBackground = new javax.swing.JComboBox<>(); 
     chooseShape = new javax.swing.JComboBox<>(); 
     jLabel1 = new javax.swing.JLabel(); 
     jLabel2 = new javax.swing.JLabel(); 
     jLabel3 = new javax.swing.JLabel(); 
     canvas1 = new lienzo(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

     chooseBackground.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "WHITE", "BLACK", "PINK" })); 
     chooseBackground.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       chooseBackgroundActionPerformed(evt); 
      } 
     }); 

     chooseShape.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "BLUE", "YELLOW", "ORANGE" })); 
     chooseShape.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       chooseShapeActionPerformed(evt); 
      } 
     }); 

     jLabel1.setText("Seleccione el color:"); 

     jLabel2.setText("Fondo:"); 

     jLabel3.setText("Figura:"); 

     canvas1.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() { 
      public void mouseMoved(java.awt.event.MouseEvent evt) { 
       canvas1MouseMoved(evt); 
      } 
     }); 
     canvas1.addMouseListener(new java.awt.event.MouseAdapter() { 
      public void mouseEntered(java.awt.event.MouseEvent evt) { 
       canvas1MouseEntered(evt); 
      } 
      public void mouseExited(java.awt.event.MouseEvent evt) { 
       canvas1MouseExited(evt); 
      } 
     }); 

     javax.swing.GroupLayout canvas1Layout = new javax.swing.GroupLayout(canvas1); 
     canvas1.setLayout(canvas1Layout); 
     canvas1Layout.setHorizontalGroup(
      canvas1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 0, Short.MAX_VALUE) 
     ); 
     canvas1Layout.setVerticalGroup(
      canvas1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 184, 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() 
       .addGap(31, 31, 31) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addGroup(layout.createSequentialGroup() 
         .addComponent(jLabel1) 
         .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
          .addComponent(canvas1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
          .addGroup(layout.createSequentialGroup() 
           .addComponent(jLabel2) 
           .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
           .addComponent(chooseBackground, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
           .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 59, Short.MAX_VALUE) 
           .addComponent(jLabel3) 
           .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
           .addComponent(chooseShape, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))) 
         .addGap(97, 97, 97)))) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addGap(13, 13, 13) 
       .addComponent(jLabel1) 
       .addGap(18, 18, 18) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(chooseBackground, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(chooseShape, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(jLabel2) 
        .addComponent(jLabel3)) 
       .addGap(18, 18, 18) 
       .addComponent(canvas1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addContainerGap(33, Short.MAX_VALUE)) 
     ); 

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

    private void chooseBackgroundActionPerformed(java.awt.event.ActionEvent evt) {             
     // TODO add your handling code here: 
     String selection = chooseBackground.getSelectedItem().toString(); 

     Color color; 
     try{ 
     Field field = Class.forName("java.awt.Color").getField(selection); 
     color = (Color)field.get(null); 
     }catch(Exception e){ 
      color = null; 
     } 

     canvas1.setBackground(color); 

    }             

    private void chooseShapeActionPerformed(java.awt.event.ActionEvent evt) {            
     // TODO add your handling code here: 

     String selection = chooseShape.getSelectedItem().toString(); 

     Color color; 
     try{ 
     Field field = Class.forName("java.awt.Color").getField(selection); 
     color = (Color)field.get(null); 

     }catch(Exception e){ 
      color = null; 
     } 

     canvas1.setForeground(color); 




    }           

    private void canvas1MouseMoved(java.awt.event.MouseEvent evt) {         
     // TODO add your handling code here: 

     canvas1.setX(evt.getX()); 
     canvas1.setY(evt.getY());   
    }         

    private void canvas1MouseEntered(java.awt.event.MouseEvent evt) {          
     // TODO add your handling code here: 
     canvas1.userHasMouseEntered=true; 
    }          

    private void canvas1MouseExited(java.awt.event.MouseEvent evt) {          
     // TODO add your handling code here: 
     canvas1.userHasMouseEntered=false; 
    }         



    /** 
    * @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(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (InstantiationException ex) { 
      java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (IllegalAccessException ex) { 
      java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } 
     //</editor-fold> 
     //</editor-fold> 

     /* Create and display the form */ 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       new Frame().setVisible(true); 
      } 
     }); 
    } 







    // Variables declaration - do not modify      
    private lienzo canvas1; 
    private javax.swing.JComboBox<String> chooseBackground; 
    private javax.swing.JComboBox<String> chooseShape; 
    private javax.swing.JLabel jLabel1; 
    private javax.swing.JLabel jLabel2; 
    private javax.swing.JLabel jLabel3; 
    // End of variables declaration     


}

帆布：

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JPanel; 
import javax.swing.Timer; 

/* 
* To change this license header, choose License Headers in Project Properties. 
* To change this template file, choose Tools | Templates 
* and open the template in the editor. 
*/ 

/** 
* 
* @author YonePC 
*/ 
public class lienzo extends JPanel { 
    public boolean userHasMouseEntered; 

    private int countSavedPos = 0; 

    private int[] posX = new int[5]; 
    private int[] posY = new int[5]; 

    private int x; 
    private int y; 

    public void setX(int x) { 
     this.x = x; 
    } 

    public void setY(int y) { 
     this.y = y; 
    } 

    public lienzo() { 
      Timer timer = new Timer(100, new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        repaint(); 
       } 
      }); 
      timer.start(); 

     this.setBackground(Color.white); 
     this.setForeground(Color.blue); 

    } 


    @Override 
    public void paintComponent(Graphics g){ 
     super.paintComponent(g); 
     if(userHasMouseEntered) 
     g.fillOval(x, y, 30, 30); 



     posX[countSavedPos] = x; 
     posY[countSavedPos] = y; 
     countSavedPos++; 
     if(countSavedPos>4) countSavedPos=0; 

     for (int i = 0; i < countSavedPos; i++) { 
      g.fillOval(posX[countSavedPos], posY[countSavedPos], 30, 30); 


     } 

     //repaint(); 
    } 


}

另外，我不明白为什么目前的椭圆形光标下正确绘制，是画很好，但第二跟随它的一个闪烁。另外为什么我有两个椭圆形，我没有保留最后5个位置并重新绘制它们？

谢谢你的时间真诚。

我也看到： How to use a swing Timer with JPanel Converting a String to Color in Java Move an Oval in java

来源

2017-09-28 Enoy

你好，我不得不从同学们的帮助，我想回答我的问题：

要存储鼠标，我们使用到画布上最后的5个位置：

private final ArrayList<Position> trail = new ArrayList<>(); 




public void addNewPosition(Position position){ 
     trail.add(0, position);  
} 

public void removeLastPosition(){ 
    if (trail.size()> 5) trail.remove(5); 
}

要更新最后5个位置，我们放入JFrame中：

private void canvas1MouseMoved(java.awt.event.MouseEvent evt) {         
    // TODO add your handling code here: 
    canvas1.addNewPosition(new Position(evt.getX(),evt.getY())); 
    canvas1.removeLastPosition(); 
    repaint(); 

    /* 
    canvas1.setX(evt.getX()); 
    canvas1.setY(evt.getY());*/   
}

画椭圆形，使他们看起来分离，到画布：

@Override 
public void paintComponent(Graphics g){ 
    super.paintComponent(g); 

    if(userHasMouseEntered){ 

      for (int i = 0; i < trail.size(); i++) { 
       g.fillOval(trail.get(i).getX(), trail.get(i).getY(), 30, 30); 
       try { 
        Thread.sleep(25); 
       } catch (InterruptedException ex) { 
        Logger.getLogger(lienzo.class.getName()).log(Level.SEVERE, null, ex); 
       } 
      } 


    } 
    repaint(); 
}

谢谢。

来源

2017-10-01 17:25:23 Enoy

移动一个椭圆形跟随光标的java

回答

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