Mac OS X Java最初并不绘制
尝试在Java上使用基本swing一直给我带来问题。 当运行时创建JFrame时,最初不会绘制任何组件,您必须调整窗口大小才能调用paint?有没有一个简单的解决办法,我错过了Mac OS X Java最初并不绘制,java,swing,Java,Swing,尝试在Java上使用基本swing一直给我带来问题。 当运行时创建JFrame时,最初不会绘制任何组件,您必须调整窗口大小才能调用paint?有没有一个简单的解决办法,我错过了 import javax.swing.*; import java.awt.event.*; import java.awt.*; public class LabTen extends JFrame{ int x, y; public LabTen(){ this.setSize(
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class LabTen extends JFrame{
int x, y;
public LabTen(){
this.setSize(200,200);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.getContentPane().add(new Board()); //do this in the constructor
}
public static void main(String[] args){
LabTen one = new LabTen();
one.repaint();
}
}
//mouseListener has more things when we're going in and out so you should have it too
//write on the component or pannel, not the frame
class Board extends JComponent implements MouseListener, MouseMotionListener{
int mouseX, mouseY;
public Board(){
addMouseListener(this);
addMouseMotionListener(this);
}
public void mouseMoved(MouseEvent e){
this.mouseX = e.getX();
this.mouseY = e.getY();
this.repaint();
}
public void mouseDragged(MouseEvent e){
//do nothing...
}
public void mouseClicked(MouseEvent e){
}
public void mouseEntered(MouseEvent e){
}
public void mouseExited(MouseEvent e){
}
public void mousePressed(MouseEvent e){
}
public void mouseReleased(MouseEvent e){
}
public void paintComponent(Graphics g){
//g.drawString("(" + this.mouseX + ", " + this.mouseY + ")", this.mouseX,this.mouseY);
//this uses the default way
// g.drawLine(this.getWidth()/2, this.getHeight()/2, this.mouseX, this.mouseY);
double distance = Math.sqrt(Math.pow(this.mouseX - this.getWidth()/2, 2) + Math.pow(this.mouseY - this.getHeight()/2, 2));
int centerX = this.getWidth()/2;
int centerY = this.getHeight()/2;
for(int i = 0; i < 20; i++){
double distanceX =
g.drawLine(centerX, centerY, (centerX))
}
}
}
你完全是按错误的顺序做的。这样做: 添加组件
this.add(new Board());
设置首选大小
this.setPreferredSize(new Dimension(200, 200));
装好架子
this.pack();
将框架设置为可见
this.setVisible(true);
当然,这是你的JFrame。你完全按照错误的顺序来做。这样做: 添加组件
this.add(new Board());
设置首选大小
this.setPreferredSize(new Dimension(200, 200));
装好架子
this.pack();
将框架设置为可见
this.setVisible(true);
当然,这是您的JFrame。设置好JFrame后,应调用JFrame.pack和JFrame.setVisibletrue。设置好JFrame后,您应该调用jFrame.pack和jFrame.setVisibletrue。在实现之前,所有组件都需要添加到容器中。在实现之前,所有组件都需要添加到容器中。作为旁注,它在windows下工作,在X11转发下作为旁注,它在windows和X11转发下工作,这比我想象的要容易得多。我的教授在windows的课堂上做他的代码示例,显然oracles版本的java并不关心您何时添加组件。谢谢这比我想象的要容易得多。我的教授在windows的课堂上做他的代码示例,显然oracles版本的java并不关心您何时添加组件。谢谢