lgpaint.java

applet 绘图板 applet 绘图板 applet 绘图板 applet 绘图板 applet 绘图板

import java.applet.Applet;
import java.applet.AppletContext;
import java.awt.*;

public class lgpaint extends Applet implements Runnable {

	public lgpaint() {
		m_draw = null;
		once = true;
		begin = false;
		running = false;
		started = false;
		stamp = false;
		menu = new Panel();
		choices = new Choice();
		mode = new Choice();
		clear = new Button("Clear");
		help = new Button("Help");
	}

	public void buildChoices(Choice choice) {
		for (int i = 1; i <= 10; i++)
			choice.addItem((new Integer(i)).toString());

	}

	public void destroy() {
		if (m_draw != null) {
			m_draw.stop();
			m_draw = null;
		}
		running = false;
	}

	public String getAppletInfo() {
		return "For Demo Applet";
	}

	public void init() {
		setLayout(new BorderLayout());
		d = size();
		resize(d.width, d.height);
		requestFocus();
	}

	public boolean mouseEnter(Event event, int i, int j) {
		getAppletContext().showStatus(
				"Applet by Lawrence Goetz - LawrenceGoetz.com");
		return true;
	}

	public boolean mouseExit(Event event, int i, int j) {
		getAppletContext().showStatus("");
		return true;
	}

	public void paint(Graphics g) {
		pad.repaint();
	}

	public void pause(int i) {
		try {
			Thread.sleep(i);
		} catch (InterruptedException _ex) {
		}
	}

	public void run() {
		boolean flag = true;
		running = true;
		started = true;
		pad.setup();
		pad.repaint();
	}

	public void start() {
		if (m_draw == null) {
			m_draw = new Thread(this);
			started = false;
		}
		if (once) {
			pad = new lgcanvas(d.width, d.height, this, choices, mode);
			menu.setBackground(Color.gray);
			buildChoices(choices);
			mode.addItem("Pen");
			mode.addItem("Stamp");
			mode.addItem("Background");
			choices.select(0);
			mode.select(0);
			menu.add(help);
			menu.add(clear);
			menu.add(new Label("Mode", 2));
			menu.add(mode);
			menu.add(new Label("Choice", 2));
			menu.add(choices);
			add("North", menu);
			add("Center", pad);
			once = false;
			new paintselect(pad, choices, mode, help, clear);
		}
		begin = true;
		if (!m_draw.isAlive())
			m_draw.start();
	}

	public void stop() {
		if (m_draw != null) {
			m_draw.stop();
			m_draw = null;
		}
		running = false;
	}

	public void update(Graphics g) {
		paint(g);
	}

	private Thread m_draw;

	private String filename;

	private lgcanvas pad;

	private boolean once;

	private Dimension d;

	private boolean begin;

	private boolean running;

	private boolean started;

	private boolean stamp;

	private Panel menu;

	private Choice choices;

	private Choice mode;

	private Button clear;

	private Button help;
}