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jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart
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/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, DrawStringDemo.java is part of JTStand.
 *
 * JTStand is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with GTStand.  If not, see .
 */

package org.jfree.demo;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTabbedPane;
import javax.swing.SwingConstants;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.FontChooserPanel;
import org.jfree.ui.RefineryUtilities;
import org.jfree.ui.TextAnchor;

/**
 * A demo of some of the string drawing methods in the JCommon class library.
 */
public class DrawStringDemo extends ApplicationFrame
                            implements ActionListener, ChangeListener {

    /** The alignment anchor for the first panel. */
    private JComboBox combo1;

    /** The alignment anchor for the second panel. */
    private JComboBox combo2;

    /** The rotation anchor for the second panel. */
    private JComboBox combo3;

    /** A slider for the second panel - controls the angle of rotation. */
    private JSlider slider;

    /** String panel 1. */
    private DrawStringPanel drawStringPanel1;

    /** String panel 2. */
    private DrawStringPanel drawStringPanel2;

    /**
     * Creates a new demo instance.
     *
     * @param title  the frame title.
     */
    public DrawStringDemo(final String title) {
        super(title);
        setContentPane(createContentPane());
    }

    /**
     * Receives action events.
     *
     * @param event  the event.
     */
    public void actionPerformed(final ActionEvent event) {
        if (event.getActionCommand().equals("fontButton.clicked")) {
            displayFontDialog();
        }
        if (event.getActionCommand().equals("combo1.changed")) {
            handleCombo1Change();
        }
        if (event.getActionCommand().equals("combo2.changed")) {
            handleCombo2Change();
        }
        if (event.getActionCommand().equals("combo3.changed")) {
            handleCombo3Change();
        }
    }

    /**
     * Receives change event notification from the slider.
     *
     * @param event  the event.
     */
    public void stateChanged(ChangeEvent event) {
        int r = this.slider.getValue();
        double angle = Math.PI * 2.0 * (r / 360.0);
        this.drawStringPanel2.setAngle(angle);
        this.drawStringPanel2.invalidate();
        this.drawStringPanel2.repaint();
    }

    /**
     * Updates the display when combo 1 is updated.
     */
    private void handleCombo1Change() {
        final String text = this.combo1.getSelectedItem().toString();
        this.drawStringPanel1.setAnchor(convertStringToAnchor(text));
        this.drawStringPanel1.invalidate();
        this.drawStringPanel1.repaint();
    }

    /**
     * Updates the display when combo 2 is updated.
     */
    private void handleCombo2Change() {
        final String text = this.combo2.getSelectedItem().toString();
        this.drawStringPanel2.setAnchor(convertStringToAnchor(text));
        this.drawStringPanel2.invalidate();
        this.drawStringPanel2.repaint();
    }

    /**
     * Updates the display when combo 3 is updated.
     */
    private void handleCombo3Change() {
        final String text = this.combo3.getSelectedItem().toString();
        this.drawStringPanel2.setRotationAnchor(convertStringToAnchor(text));
        this.drawStringPanel2.invalidate();
        this.drawStringPanel2.repaint();
    }

    /**
     * Creates the content pane for the demo frame.
     *
     * @return The content pane.
     */
    private JPanel createContentPane() {
        final JPanel content = new JPanel(new BorderLayout());
        final JTabbedPane tabs = new JTabbedPane();
        tabs.add("Alignment", createTab1Content());
        tabs.add("Rotation", createTab2Content());
        content.add(tabs);
        return content;
    }

    /**
     * Creates the content for tab 1.
     *
     * @return The content panel.
     */
    private JPanel createTab1Content() {
        final JPanel content = new JPanel(new BorderLayout());
        this.combo1 = new JComboBox();
        this.combo1.setActionCommand("combo1.changed");
        populateTextAnchorCombo(this.combo1);
        this.combo1.addActionListener(this);

        final JPanel controls = new JPanel();
        controls.add(this.combo1);

        final JButton fontButton = new JButton("Select Font...");
        fontButton.setActionCommand("fontButton.clicked");
        fontButton.addActionListener(this);
        controls.add(fontButton);
        content.add(controls, BorderLayout.NORTH);
        this.drawStringPanel1 = new DrawStringPanel("0123456789", false);
        content.add(this.drawStringPanel1);
        return content;
    }

    /**
     * Creates the content for tab 2.
     *
     * @return The content panel.
     */
    private JPanel createTab2Content() {
        JPanel content = new JPanel(new BorderLayout());
        JPanel controls = new JPanel();
        controls.add(new JLabel("Text anchor: "));
        this.combo2 = new JComboBox();
        populateTextAnchorCombo(this.combo2);
        this.combo2.setActionCommand("combo2.changed");
        this.combo2.addActionListener(this);
        controls.add(this.combo2);
        controls.add(new JLabel("Rotation anchor: "));
        this.combo3 = new JComboBox();
        populateTextAnchorCombo(this.combo3);
        this.combo3.setActionCommand("combo3.changed");
        this.combo3.addActionListener(this);
        controls.add(this.combo3);
        this.slider = new JSlider(SwingConstants.VERTICAL, 0, 360, 0);
        this.slider.setMajorTickSpacing(45);
        this.slider.setMinorTickSpacing(5);
        this.slider.setPaintLabels(true);
        this.slider.setPaintTicks(true);
        this.slider.setPaintTrack(true);
        this.slider.addChangeListener(this);
        content.add(controls, BorderLayout.NORTH);
        content.add(this.slider, BorderLayout.WEST);
        this.drawStringPanel2 = new DrawStringPanel("Rotated Text", true);
        content.add(this.drawStringPanel2);
        return content;
    }

    /**
     * Displays a primitive font chooser dialog to allow the user to change the font.
     */
    private void displayFontDialog() {

        final FontChooserPanel panel = new FontChooserPanel(this.drawStringPanel1.getFont());
        final int result = JOptionPane.showConfirmDialog(this, panel, "Font Selection",
                                                   JOptionPane.OK_CANCEL_OPTION,
                                                   JOptionPane.PLAIN_MESSAGE);

        if (result == JOptionPane.OK_OPTION) {
            this.drawStringPanel1.setFont(panel.getSelectedFont());
            this.drawStringPanel2.setFont(panel.getSelectedFont());
        }

    }

    /**
     * Populates a combo box with the available {@link TextAnchor} options.
     *
     * @param combo  the combo box.
     */
    private void populateTextAnchorCombo(final JComboBox combo) {
        combo.addItem("TextAnchor.TOP_LEFT");
        combo.addItem("TextAnchor.TOP_CENTER");
        combo.addItem("TextAnchor.TOP_RIGHT");
        combo.addItem("TextAnchor.HALF_ASCENT_LEFT");
        combo.addItem("TextAnchor.HALF_ASCENT_CENTER");
        combo.addItem("TextAnchor.HALF_ASCENT_RIGHT");
        combo.addItem("TextAnchor.CENTER_LEFT");
        combo.addItem("TextAnchor.CENTER");
        combo.addItem("TextAnchor.CENTER_RIGHT");
        combo.addItem("TextAnchor.BASELINE_LEFT");
        combo.addItem("TextAnchor.BASELINE_CENTER");
        combo.addItem("TextAnchor.BASELINE_RIGHT");
        combo.addItem("TextAnchor.BOTTOM_LEFT");
        combo.addItem("TextAnchor.BOTTOM_CENTER");
        combo.addItem("TextAnchor.BOTTOM_RIGHT");
    }

    /**
     * Converts a string to a corresponding {@link TextAnchor} instance.
     *
     * @param text  the text.
     *
     * @return The anchor.
     */
    private TextAnchor convertStringToAnchor(final String text) {

        if (text.equals("TextAnchor.TOP_LEFT")) {
            return TextAnchor.TOP_LEFT;
        }
        else if (text.equals("TextAnchor.TOP_CENTER")) {
            return TextAnchor.TOP_CENTER;
        }
        else if (text.equals("TextAnchor.TOP_RIGHT")) {
            return TextAnchor.TOP_RIGHT;
        }
        else if (text.equals("TextAnchor.CENTER_LEFT")) {
            return TextAnchor.CENTER_LEFT;
        }
        else if (text.equals("TextAnchor.CENTER")) {
            return TextAnchor.CENTER;
        }
        else if (text.equals("TextAnchor.CENTER_RIGHT")) {
            return TextAnchor.CENTER_RIGHT;
        }
        else if (text.equals("TextAnchor.HALF_ASCENT_LEFT")) {
            return TextAnchor.HALF_ASCENT_LEFT;
        }
        else if (text.equals("TextAnchor.HALF_ASCENT_CENTER")) {
            return TextAnchor.HALF_ASCENT_CENTER;
        }
        else if (text.equals("TextAnchor.HALF_ASCENT_RIGHT")) {
            return TextAnchor.HALF_ASCENT_RIGHT;
        }
        else if (text.equals("TextAnchor.BASELINE_LEFT")) {
            return TextAnchor.BASELINE_LEFT;
        }
        else if (text.equals("TextAnchor.BASELINE_CENTER")) {
            return TextAnchor.BASELINE_CENTER;
        }
        else if (text.equals("TextAnchor.BASELINE_RIGHT")) {
            return TextAnchor.BASELINE_RIGHT;
        }
        else if (text.equals("TextAnchor.BOTTOM_LEFT")) {
            return TextAnchor.BOTTOM_LEFT;
        }
        else if (text.equals("TextAnchor.BOTTOM_CENTER")) {
            return TextAnchor.BOTTOM_CENTER;
        }
        else if (text.equals("TextAnchor.BOTTOM_RIGHT")) {
            return TextAnchor.BOTTOM_RIGHT;
        }
        else {
            return null;
        }

    }

    /**
     * The starting point for the demo.
     *
     * @param args  ignored.
     */
    public static void main(final String[] args) {

        final DrawStringDemo demo = new DrawStringDemo("DrawString Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}