【发布时间】：2013-11-12 01:35:04
【问题描述】：
对于我的项目，我必须在一帧上显示三个不同的图形。我认为可以做到这一点的方法是将一个主面板添加到框架中，然后将其他三个框架添加到主框架中。第一个是在特定位置填充的四个圆圈，第二个是图表，第三个是时钟。目前我只是想让第一个工作，以便我可以将其应用于其他两个。我的程序可以编译，但是当我运行它时，我只是得到一个空白窗口。是什么导致它不显示图形？ n00832607 类是这样命名的，并且是小写的，因为在我的学校系统上提交项目的手续，请忽略它。
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class n00832607 extends JFrame {
private JPanel panelMain;
private FourFans panelfans;
public n00832607() {
//Main Panel
panelMain = new JPanel();
add(panelMain);
//Creating Fans
panelfans = new FourFans();
panelMain.add(panelfans);
}
//Main Method
public static void main(String[] args) {
n00832607 frame = new n00832607();
frame.setVisible(true);
frame.setSize(400, 400);
frame.setTitle("Project 6");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
//n00832607 Class Finish
class FourFans extends JPanel
{
public FourFans()
{
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 2));
panel.add(new Fan());
panel.add(new Fan());
panel.add(new Fan());
panel.add(new Fan());
}
}
//Responsible for creating Fan
class Fan extends JPanel {
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
int height = getHeight();
int width = getWidth();
g.setColor(Color.BLACK);
g.drawOval((int)(0.09 * width), (int)(0.09*height), (int)(0.825 * height), (int) (0.825 * height));
g.fillArc((int)(0.1 * width), (int)(0.1 * height), (int)(0.8 * width), (int)(0.8 * height), 20, 30);
g.fillArc((int)(0.1 * width), (int)(0.1 * height), (int)(0.8 * width), (int)(0.8 * height), 110, 30);
g.fillArc((int)(0.1 * width), (int)(0.1 * height), (int)(0.8 * width), (int)(0.8 * height), 200, 30);
g.fillArc((int)(0.1 * width), (int)(0.1 * height), (int)(0.8 * width), (int)(0.8 * height), 290, 30);
}
}
编辑 我得到了你建议的工作，现在粉丝们出现了，他们非常小，但我可以稍后尝试处理这个问题，因为他们现在真的出现了。我试图将其应用于下一个数字，但它似乎不起作用。第一部分现在看起来像
public class n00832607 extends JFrame {
private JPanel panelMain;
private FourFans panelfans;
private SquareFunction panelfunction;
public n00832607() {
//Main Panel
panelMain = new JPanel();
add(panelMain);
//Creating Fans
panelfans = new FourFans();
panelMain.add(panelfans);
//Creating Function
panelfunction = new SquareFunction();
panelMain.add(panelfunction);
}
//Main Method
public static void main(String[] args) {
n00832607 frame = new n00832607();
frame.setSize(400, 400);
frame.setTitle("Project 6");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
这是我正在使用的 SquareFuction 的代码。当我运行时，风扇显示得很小，并且有很多空白区域可以显示 SquareFunction。这是它的图片
class SquareFunction extends JPanel
{
public SquareFunction()
{
add(new GraphMaker());
}
}
//Responsible for creating the graph
class GraphMaker extends JPanel {
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
double scaleFactor = 0.1;
Polygon p = new Polygon();
int y = 0;
for(int x = -100; x <= 100; x++)
{
if(y < 200 - (int)(scaleFactor * x * x))
{
y = 200 - (int)(scaleFactor * x * x);
}
p.addPoint(x+200,200-(int)(scaleFactor * x * x));
}
g.setColor(Color.BLACK);
g.drawLine(20, y+1, getWidth() - 50, y+1);
g.drawLine(200, 0, 200, y+1);
g.drawString("X", 345, 200);
g.drawString("Y", 200, 9);
g.setColor(Color.BLUE);
g.drawPolygon(p);
g.setColor(Color.WHITE);
g.drawLine(50, 200 - (int)(scaleFactor * 100 * 100), 300, 200 - (int)(scaleFactor * 100 * 100));
}
}
【问题讨论】：
标签： java swing graphics jframe jpanel