对于作业,我试图创建一个具有框架的“自定义按钮”,在该框架中,我绘制了两个三角形,并在其上绘制了一个正方形。它应该为用户提供按下按钮后按下按钮的效果。因此,对于初学者来说,我尝试设置开始图形,绘制两个三角形和一个正方形。我遇到的问题是,虽然我将框架设置为 200、200,并且我绘制的三角形我认为是框架尺寸的正确端部,但当我运行程序时,我必须扩展窗 Eloquent 能制作整个艺术品,我的“自定义按钮”可见。这正常吗?谢谢。
代码:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CustomButton
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
CustomButtonFrame frame = new CustomButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class CustomButtonFrame extends JFrame
{
// constructor for CustomButtonFrame
public CustomButtonFrame()
{
setTitle("Custom Button");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
CustomButtonSetup buttonSetup = new CustomButtonSetup();
this.add(buttonSetup);
}
private static final int DEFAULT_WIDTH = 200;
private static final int DEFAULT_HEIGHT = 200;
}
class CustomButtonSetup extends JComponent
{
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
// first triangle coords
int x[] = new int[TRIANGLE_SIDES];
int y[] = new int[TRIANGLE_SIDES];
x[0] = 0; y[0] = 0;
x[1] = 200; y[1] = 0;
x[2] = 0; y[2] = 200;
Polygon firstTriangle = new Polygon(x, y, TRIANGLE_SIDES);
// second triangle coords
x[0] = 0; y[0] = 200;
x[1] = 200; y[1] = 200;
x[2] = 200; y[2] = 0;
Polygon secondTriangle = new Polygon(x, y, TRIANGLE_SIDES);
g2.drawPolygon(firstTriangle);
g2.setColor(Color.WHITE);
g2.fillPolygon(firstTriangle);
g2.drawPolygon(secondTriangle);
g2.setColor(Color.GRAY);
g2.fillPolygon(secondTriangle);
// draw rectangle 10 pixels off border
g2.drawRect(10, 10, 180, 180);
}
public static final int TRIANGLE_SIDES = 3;
}
最佳答案
尝试添加
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
到您的 CustomButtonSetup 类。
然后做
setTitle("Custom Button");
//setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
CustomButtonSetup buttonSetup = new CustomButtonSetup();
this.add(buttonSetup);
pack();
(来自 pack()
的 api 文档:)
Causes this Window to be sized to fit the preferred size and layouts of its subcomponents.
你应该得到类似的东西:
关于java - 帮助简单的框架和图形,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2871586/