在JFRAME或JPANEL JAVA上绘制功能
我想知道是否可以在其他类中使用/制作功能来绘制图像/椭圆形，然后在我们的主要班级中的Paint Public Void中调用它。
如果我有
public class Trydraw{
public void drawrcircle(Graphics g){
g.setColor(Color.RED);
g.drawOval(0, 0, 20,20);
g.fillOval(0,0,20,20);
}
}
，然后以这种方式称呼它，
import java.awt.GridLayout;
import javax.swing.*;
import java.awt.*;
public class Display extends JPanel{
public static void main(String[]haha){
JFrame frame = new JFrame();
frame.setSize(800, 500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public void paint(Graphics g){
super.paint(g);
Trydraw l = new Trydraw();
l.drawrcircle(g);
}
}
感谢您的未来帮助。
I wanted to know if it is possible to use/make a function in another Class to draw an image/oval and then call it in the paint public void in our main Class.
If I have
public class Trydraw{
public void drawrcircle(Graphics g){
g.setColor(Color.RED);
g.drawOval(0, 0, 20,20);
g.fillOval(0,0,20,20);
}
}
And then call it here this way
import java.awt.GridLayout;
import javax.swing.*;
import java.awt.*;
public class Display extends JPanel{
public static void main(String[]haha){
JFrame frame = new JFrame();
frame.setSize(800, 500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public void paint(Graphics g){
super.paint(g);
Trydraw l = new Trydraw();
l.drawrcircle(g);
}
}
Thanks for your future help.
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是的，如果我正确地收到您的问题，您可以。
您的示例代码对我有用
如果我添加到您的方法的末尾，
。
使用您的代码段，
paint（g）方法将永远不会被调用，因为它将使用jpanel的初始化执行，该jpanel将使用初始化进行初始化。显示您可能要创建一个
display的实例，该实例将使用OverdriddedPaint（g）方法自动初始化Jpanel，因此>新的操作员。由于
jpanel的构造函数返回jpanel，显示的构造函数也返回一种jpanel的类型，其中包含红色圆圈。此jpanel需要在您的原始jframe中添加添加方法。Yes you can, if I get your question correctly.
Your sample code works for me if I add
to the end of your
method.
With your snippet the
paint(g)method will never be called, because it will be executed with the initialization of theJPanelwhich will be initialized with the initialization theDisplayclass (because of inheritance).You probably want to create an instance of
Display, which automatically initializes theJPanelwith the overriddenpaint(g)method, thus thenewOperator.As the constructor of a
JPanelreturns aJPanel, the constructor of Display returns a type ofJPanelas well, which contains the red circle. ThisJPanelneeds to be added with theaddmethod to your originalJFrame.