将抽绳中的文本居中

Question

Soo用户可以选择文本"Welcome to Java Programming"文本是斜体、粗体还是居中。这些选项是复选框。我不知道如何制作，这样当用户选择中心时，它就会在中心。

public void paint(Graphics g) {
   super.paint(g);
   g.setColor(Color.black);
   g.drawRoundRect(75,90,324,120,10,10);
   g.drawLine(183,90,183,210);
   g.setColor(currentC);
   g.setFont(new Font(currentFont, intBold + intItalic, 24));
   g.drawString("Welcome to Java Programming",30,70);
}
public void itemStateChanged(ItemEvent e) {
  if(e.getSource() == checkBoxBold) { 
      if(e.getStateChange() == ItemEvent.SELECTED)
          intBold = Font.BOLD;
      if(e.getStateChange() == ItemEvent.DESELECTED)
          intBold = Font.PLAIN;
  } 
  if(e.getSource() == checkBoxItalics) {
      if(e.getStateChange() == ItemEvent.SELECTED)
          intItalic = Font.ITALIC;
      if(e.getStateChange() == ItemEvent.DESELECTED)
          intItalic = Font.PLAIN;
  }  
  if(e.getSource() == checkBoxCenter) {
      if(e.getStateChange() == ItemEvent.SELECTED)
         //PROBLEM RIGHT HERE
      if(e.getStateChange() == ItemEvent.DESELECTED)
  } 
  if(e.getSource() == radioRed)
      currentC = Color.red;
  else if(e.getSource() == radioGreen)
      currentC = Color.green;
      else if(e.getSource() == radioBlue)
          currentC = Color.blue;
  if(e.getSource() == fontChoice)
      currentFont = fontNames[fontChoice.getSelectedIndex()];
  repaint();
}

Answer 1

使用FontMetrics:

FontMetrics fm = g.getFontMetrics();

要获得文本宽度，请使用：

fm.stringWidth(text)

然后在上输出您的文本

width / 2 - fm.stringWidth(text) / 2

其中width是输出区域的宽度。