我目前正在一个Java项目中，该项目由一个框架，一个主面板和3个子面板组成。在主面板的北部，我有我的dataPanel，在西部，我有我的buttonPanel，在中心有我的drawPanel
我的DrawPanel应该显示5个圆的首字母，每当单击创建按钮时，它应该绘制X个由用户指定的圆。但是我希望圆心在DrawPanel中全部可见，这意味着从面板上切下的圆不超过1/2。我不希望设置长度和宽度来使其相对于框架/面板尺寸动态变化。
这是我的代码
public class MainPanel extends JPanel{
private DataPanel data;
private JPanel buttonPanel;
private DrawPanel dPanel;
private JButton create;
private JButton sort;
private JButton coCenter;
private JButton reset;
public MainPanel()
{
setLayout(new BorderLayout());
data = new DataPanel();
add(data, BorderLayout.NORTH);
buttonPanelInitialize();
add(buttonPanel,BorderLayout.WEST);
int a,b,c;
a = data.getDataField();
b = data.getDataField1();
c = data.getDataField2();
dPanel = new DrawPanel(a,b,c);
add(dPanel, BorderLayout.CENTER);
}
private void buttonPanelInitialize()
{
buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(4,1));
buttonCreate();
buttonSort();
buttonCoCenter();
buttonReset();
buttonPanel.add(create);
buttonPanel.add(sort);
buttonPanel.add(coCenter);
buttonPanel.add(reset);
}
private void buttonCreate()
{
create = new JButton("Create");
class cListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent event) {
//int amount = 0;
int amount = data.getDataField();
int smallestR = data.getDataField1();
int largestR = data.getDataField2();
dPanel.create(amount,smallestR,largestR);
}
}
ActionListener createListener = new cListener();
create.addActionListener(createListener);
}
和
public class DrawPanel extends JPanel{
private ArrayList<ColorCircle> circles;
private int numberOfCircles;
private int smallestRadiusSize;
private int biggestRadiusSize;
private int width;
private int height;
public DrawPanel()
{
circles = new ArrayList<ColorCircle>();
}
public DrawPanel(int number, int smallestRadius, int biggestRadius)
{
circles = new ArrayList<ColorCircle>();
create(number,smallestRadius,biggestRadius);
width = (int)Math.random()*getWidth();
height = (int)Math.random()*getHeight();
}
public void create(int number, int smallestRadius, int biggestRadius)
{
numberOfCircles = number;
smallestRadiusSize = smallestRadius;
biggestRadiusSize = biggestRadius;
for(int i = 0; i < numberOfCircles ; i++)
{
int radius = (int) ((int)smallestRadiusSize+Math.random()*((int)biggestRadiusSize-(int)smallestRadiusSize+1));
width = (int) ((int)100+Math.random()*701); //the problem is here
height = (int) ((int)100+Math.random()*501); //and here this part should be dynamic
circles.add(new ColorCircle(width,height,radius));
System.out.println(smallestRadiusSize);
System.out.println(biggestRadiusSize);
System.out.println(radius+"-----");
System.out.println(circles.size());
System.out.println(width+" THis is x");
System.out.println(height+" THIs is Y");
repaint();
}
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
for(ColorCircle c : circles)
{
c.fill(g2);
}
}
最佳答案
是否有使其相对于框架/面板尺寸动态变化的信息
您将AncestorListener添加到面板并处理ancestorAdded事件。将面板添加到可见GUI时将生成此事件。
因此，这意味着需要从此方法（而不是构造函数）中调用您的create(...)方法。然后，在执行代码后，您可以使用面板的getWidth()和getHeight()方法来获取面板的实际大小并进行处理。