在JPanel的中心绘制形状 [英] draw a shape in center of JPanel

问题描述

嗨 我想在JPanel的中心绘制一个椭圆形
我写了这段代码:

  public   void  paintComponent(Graphics g){

    超级 .paintComponent(g);

     int  width = getWidth()/2;
     int  height = getHeight()/2;

    g.drawOval(width，height， 100 ， 100 );
}

并使用JFrame add方法将JPanel添加到JFrame，
但椭圆形不会出现在Jpanel的中心吗?

解决方案

在计算时，您需要考虑椭圆的宽度和高度.因此，您的最高点计算如下:

  int  top =(getHeight()-椭圆高度)/ 2 ;
// 宽度相同 

hi i want to draw a oval in the center of JPanel
i wrote this code:

public void paintComponent(Graphics g) {

    super.paintComponent(g);

    int width=getWidth()/2;
    int height=getHeight()/2;

    g.drawOval(width, height, 100,100);
}

and added the JPanel to JFrame with JFrame add method,
but the oval doesn''t appear in center of Jpanel?
how can i draw a shape in center of panel?

解决方案

In your calculations you need to take the width and height of the oval into consideration. Thus your top point is calculated as:

int top = (getHeight() - ovalHeight) / 2;
// same for width

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