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我正在尝试创建一个计算循环算法的程序。逻辑工作正常。我的问题是用于绘制时间线的overriden JPanel。时间线继续而且没有明确的线条长度。我想将重写面板添加到滚动窗格,以便它可以滚动。将JScrollPane添加到被覆盖的JPanel
SampleGPane.class
import java.awt.*;
import javax.swing.*;
public class
SampleGPane
{
/* Timeline elements */
Container timelineContainer;
JFrame timelineFrame = new JFrame();
JPanel pnlDraw = new JPanel();
JScrollPane timelineScroll;
public void
launchFrame()
{
GPanel gpane = new GPanel();
timelineContainer = timelineFrame.getContentPane();
timelineScroll = new JScrollPane (gpane);
timelineContainer.add (timelineScroll);
timelineFrame.setSize (500, 250);
timelineFrame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
timelineFrame.setVisible (true);
}
private class
GPanel extends JPanel
{
@Override
public void
paintComponent (Graphics g)
{
super.paintComponent (g);
int runningLineX = 0;
int runningLineY = 0;
// g.drawLine (50, 50, orderCount * 5, 50);
runningLineX += 50;
runningLineY += 50;
for (int count = 0; count < 35; count++) {
g.drawString ("J" + (count + 1), runningLineX + 50, 25);
runningLineX += 50;
// runningLineY += 50;
g.drawLine (runningLineX, runningLineY, runningLineX + 50, runningLineY);
}
}
}
}
SampleGPane.class
由SampleLaunch.class
public class
SampleLaunch
{
public static void main (String args[]) {
SampleGPane sgp = new SampleGPane();
sgp.launchFrame();
}
}
的问题是所谓的,JScrollPane的将无法正常工作。它似乎没有检测到这条线。我该如何解决?
谢谢!这有助于我解决我的问题。所以关键在于计算花费的时间,将其传递给构造函数,构造函数将设置一个用于覆盖'getPreferredSize()'方法的变量,然后启动框架。 –