Highlights.java Source code

Introduction

Here is the source code for Highlights.java

Source

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.font.FontRenderContext;
import java.awt.font.TextHitInfo;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Highlights extends JPanel {
    private TextLayout textLayout;

    private TextHitInfo firstHit, secondHit;

    private int x = 40, y = 80;

    public Highlights() {
        addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent me) {
                firstHit = textLayout.hitTestChar(me.getX() - x, me.getY() - y);
                secondHit = null;
            }

            public void mouseReleased(MouseEvent me) {
                secondHit = textLayout.hitTestChar(me.getX() - x, me.getY() - y);
                repaint();
            }
        });
        addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseDragged(MouseEvent me) {
                secondHit = textLayout.hitTestChar(me.getX() - x, me.getY() - y);
                repaint();
            }
        });

    }

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

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

        String s = "Drag the text to highlight Java Source and Support.";
        Font font = new Font("Serif", Font.PLAIN, 32);

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

        // Draw the highlight.
        if (firstHit != null && secondHit != null) {
            Shape base = textLayout.getLogicalHighlightShape(firstHit.getInsertionIndex(),
                    secondHit.getInsertionIndex());
            AffineTransform at = AffineTransform.getTranslateInstance(x, y);
            Shape highlight = at.createTransformedShape(base);
            g2.setPaint(Color.white);
            g2.fill(highlight);
        }

        g2.setPaint(Color.black);
        textLayout.draw(g2, x, y);
    }

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.getContentPane().add(new Highlights());
        f.setSize(850, 250);
        f.show();

    }
}