TextHitInfo: getCharIndex() : TextHitInfo « java.awt.font « Java by API

1. Java by API
2. java.awt.font
3. TextHitInfo

TextHitInfo: getCharIndex()

 

import java.awt.Container;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.font.FontRenderContext;
import java.awt.font.TextHitInfo;
import java.awt.font.TextLayout;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class MainClass {
  public static void main(String[] args) {
    JFrame jf = new JFrame("Demo");
    Container cp = jf.getContentPane();
    MyCanvas tl = new MyCanvas();
    cp.add(tl);
    jf.setSize(300, 200);
    jf.setVisible(true);
  }
}

class MyCanvas extends JComponent {
  private TextLayout mTextLayout;

  private int mX = 40, mY = 80;

  public MyCanvas() {
    addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        TextHitInfo hit = mTextLayout.hitTestChar(me.getX() - mX, me.getY() - mY);
        System.out.println(hit.getCharIndex());
        System.out.println(hit.getInsertionIndex());
        System.out.println(hit.isLeadingEdge());
      }
    });

  }

  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    String s = "www.java2s.com";
    Font font = new Font("Serif", Font.PLAIN, 32);

    if (mTextLayout == null) {
      FontRenderContext frc = g2.getFontRenderContext();
      mTextLayout = new TextLayout(s, font, frc);
    }

    mTextLayout.draw(g2, mX, mY);

  }
}

           
         
  

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