drawRect画一个矩形，如何在这个矩形中显示文字？

Question

在一个区域我写了文字，然后我又用drawRect画了一个矩形，想把这个区域内的文字圈中，类似于文本中选中一段文字，但是画完了矩形后，我里面的文字也被覆盖填充掉了，如何显示出文字？

Answer 1

你看看 这个对你有帮助不。import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.text.BadLocationException;public class AA extends JFrame{

public static void main(String[] args) {
new AA();
}

public AA(){
setResizable(false);
setSize(new Dimension(500,400));
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
initData();
}

private void initData(){
this.add(new MyTextArea());
}

/**
 * 自定义JTextArea
 * @author Administrator
 *
 */
private class MyTextArea extends JTextArea implements MouseMotionListener,MouseListener{

private Point pressPoint; //按下时坐标位置

private Point currenPoint; //当前鼠标拖动时的位置
public MyTextArea(){
setPreferredSize(new Dimension(500,400));
setLineWrap(true);
this.addMouseListener(this);
this.addMouseMotionListener(this);
setSelectionColor(Color.white);

}

public void paint(Graphics g){
super.paint(g);
if(pressPoint != null && currenPoint != null){
g.setColor(Color.BLACK);
int drawRectPara[] = new int[4]; //画矩形的4个参数
if(pressPoint.x < currenPoint.x){
drawRectPara[0] = pressPoint.x;
drawRectPara[2] = currenPoint.x - pressPoint.x;
}else{
drawRectPara[0] = currenPoint.x;
drawRectPara[2] = pressPoint.x - currenPoint.x;
}

if(pressPoint.y < currenPoint.y){
drawRectPara[1] = pressPoint.y;
drawRectPara[3] = currenPoint.y - pressPoint.y;
}else{
drawRectPara[1] = currenPoint.y;
drawRectPara[3] = pressPoint.y - currenPoint.y;
}

g.drawRect(drawRectPara[0],drawRectPara[1],drawRectPara[2],drawRectPara[3]);
}
}

@Override
public void mouseDragged(MouseEvent arg0) {
// TODO Auto-generated method stub
currenPoint = arg0.getPoint();
repaint();
}

@Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
pressPoint = arg0.getPoint();
this.setCursor(new Cursor(Cursor.HAND_CURSOR));
} @Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
pressPoint = null;
this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}



@Override
public void mouseMoved(MouseEvent arg0) {
// TODO Auto-generated method stub

} @Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub

} @Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub

} @Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub

}
}
}