MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.util.Hashtable;

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

public class MainClass {
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container c = f.getContentPane();
        c.add(new Justify());
        f.pack();
        f.setVisible(true);
    }
}

class Justify extends JPanel {
    final static int LEFT = 0;

    final static int RIGHT = 1;

    final static int CENTER = 2;

    final static int EQUALITY = 3;

    int justify = EQUALITY;

    public void paint(Graphics g) {
        Dimension size = getSize();

        String s = "To java2s.com or not to java2s.com, that is a question";

        Hashtable map = new Hashtable();
        map.put(TextAttribute.SIZE, new Float(32.0f));

        AttributedString as = new AttributedString(s, map);

        map = new Hashtable();
        map.put(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE);

        as.addAttributes(map, 33, 52);

        AttributedCharacterIterator aci = as.getIterator();

        int startIndex = aci.getBeginIndex();
        int endIndex = aci.getEndIndex();

        LineBreakMeasurer measurer;
        measurer = new LineBreakMeasurer(aci, new FontRenderContext(null, false, false));
        measurer.setPosition(startIndex);

        float wrappingWidth = (float) size.width;

        float Y = 0.0f;

        while (measurer.getPosition() < endIndex) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);

            Y += layout.getAscent();

            float X = 0.0f;

            switch (justify) {
            case LEFT:
                if (layout.isLeftToRight())
                    X = 0.0f;
                else
                    X = wrappingWidth - layout.getAdvance();
                break;

            case RIGHT:
                if (layout.isLeftToRight())
                    X = wrappingWidth - layout.getVisibleAdvance();
                else
                    X = wrappingWidth;
                break;

            case CENTER:
                if (layout.isLeftToRight())
                    X = (wrappingWidth - layout.getVisibleAdvance()) / 2;
                else
                    X = (wrappingWidth + layout.getAdvance()) / 2 - layout.getAdvance();
                break;

            case EQUALITY:
                layout = layout.getJustifiedLayout(wrappingWidth);
            }

            layout.draw((Graphics2D) g, X, Y);

            Y += layout.getDescent() + layout.getLeading();
        }
    }
}