移动一个椭圆以跟随光标java
我想要一些建议：
我正在学习如何使用swing并且我有一个分配，它建议创建一个应用程序，用户可以从一个组合框中选择JPanel的背景颜色（实现为自定义Beam）。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其后的五个椭圆。那么我已经完成了所有界面，并且我学会了如何使用计时器每100毫秒重新绘制一次画布。
INTERFACE：
那么我怎样才能存储椭圆形的持续五个位置？我的代码：
基础框架：
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，我不明白为什么在光标下正确绘制的当前椭圆被很好地绘制，但是跟随它的第二个椭圆会闪烁。另外，为什么我有两个椭圆形，我不保留5个最后位置并重新粉刷它们？
真诚地感谢您的时间。
我也看到： How to use a swing Timer with JPanel Converting a String to Color in Java Move an Oval in java
1 个答案:
答案 0 :(得分：0)
您好我得到了同学的帮助，我想回答我自己的问题：
存储鼠标在画布中使用的最后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);
}
更新我们放入JFrame的最后5个位置：
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());*/
}
绘制椭圆并使它们看起来分开，进入画布：
@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。
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？