DÉFILEMENT HORIZONTAL D'UN TEXTE DANS UNE APPLET [NOUVEAU!! APPLET 100% CONFIGURABLE]

/**
 * @author bouba331
 */

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.font.TextLayout;

import javax.swing.JApplet;


/**
 * An applet class used to display a scrolling message
 */
public class AppletDefil extends JApplet implements Runnable {

	/**
	 * The serial version UID used for deserialization
	 */
	private static final long serialVersionUID = 2780848656726242957L;

	/**
	 * The animation speed in milliseconds.
	 */
	private int animationSpeed = 20;

	/**
	 * Thread used to animate the applet (make pauses)
	 */
	private Thread animationThread;

	/**
	 * Object used to describe the applet background color
	 */
	private Color appletBackgroundColor;

	/**
	 * Blue value for the applet background color
	 */
	private int appletBackgroundColorBlue = 0;

	/**
	 * Green value for the applet background color
	 */
	private int appletBackgroundColorGreen = 0;

	/**
	 * Blue value for the applet background color
	 */
	private int appletBackgroundColorRed = 0;

	/**
	 * Font object for our message
	 */
	private Font messagefont;

	/**
	 * The name of the font used to display the message
	 */
	private String messagefontName = "Times";

	/**
	 * The size of the font used to display the message
	 */
	private int messageFontSize = 12;

	/**
	 * The style of the font used to display the message
	 */
	private int messageFontStyle = Font.PLAIN;

	/**
	 * The message to display
	 */
	private String message = "Message";

	/**
	 * Object used to describe the color of the message
	 */
	private Color messageColor;

	/**
	 * Blue value for the color of the message
	 */
	private int messageColorBlue = 255;

	/**
	 * Green value for color of the message
	 */
	private int messageColorGreen = 255;

	/**
	 * Red value for the color of the message
	 */
	private int messageColorRed = 255;

	/**
	 * The scroll direction, positive value indicate left to right, negative
	 * value right to left
	 */
	private int scrollDirection;

	/**
	 * Object used to describe the scroll zone background color
	 */
	private Color scrollZoneBackgroundColor;

	/**
	 * Blue value for the scroll zone background color
	 */
	private int scrollZoneBackgroundColorBlue = 0;

	/**
	 * Green value for the scroll zone background color
	 */
	private int scrollZoneBackgroundColorGreen = 0;

	/**
	 * Red value for the scroll zone background color
	 */
	private int scrollZoneBackgroundColorRed = 0;

	/**
	 * X bottom right corner coordinate of the scroll zone
	 */
	private int scrollZoneBottomRightCornerX = 390;

	/**
	 * Y bottom right corner coordinate of the scroll zone
	 */
	private int scrollZoneBottomRightCornerY = 50;

	/**
	 * X top left corner coordinate of the scroll zone
	 */
	private final int scrollZoneTopLeftCornerX = 10;

	/**
	 * Y top left corner coordinate of the scroll zone
	 */
	private final int scrollZoneTopLeftCornerY = 10;

	/**
	 * The height of our message in pixels, will be computed in the init()
	 * function.
	 */
	private int textHeight;

	/**
	 * The width of our message in pixels, will be computed in the init()
	 * function.
	 */
	private int textWidth;

	/**
	 * An x position updated to animate the message.
	 */
	private int x;

	/**
	 * @see java.applet.Applet#destroy()
	 */
	@Override
	public void destroy() {

		// Free the animation Thread
		animationThread = null;

	}

	/**
	 * @see java.applet.Applet#init()
	 */
	@Override
	public void init() {

		getAppletParameters();

		// initialize the scroll zone background color
		scrollZoneBackgroundColor = new Color(scrollZoneBackgroundColorRed,
				scrollZoneBackgroundColorGreen, scrollZoneBackgroundColorBlue);

		// initialize the applet background color
		appletBackgroundColor = new Color(appletBackgroundColorRed,
				appletBackgroundColorGreen, appletBackgroundColorBlue);

		// initialize the foreground color (text color) of the applet
		messageColor = new Color(messageColorRed, messageColorGreen,
				messageColorBlue);

		// Initialize the font
		messagefont = new Font(messagefontName, messageFontStyle,
				messageFontSize);

		// Compute the width of the message
		Graphics2D g = (Graphics2D) this.getGraphics();
		TextLayout tl = new TextLayout(message, messagefont, g
				.getFontRenderContext());
		textWidth = (int) tl.getBounds().getWidth();
		textHeight = (int) tl.getBounds().getHeight();

	}

	/**
	 * @see java.awt.Container#paint(java.awt.Graphics)
	 */
	@Override
	public void paint(Graphics graphics) {
		Graphics2D g = (Graphics2D) graphics;

		// Sets the background color and feels the rectangle
		g.setColor(scrollZoneBackgroundColor);
		g.fillRect(scrollZoneTopLeftCornerX, scrollZoneTopLeftCornerY,
				scrollZoneBottomRightCornerX, scrollZoneBottomRightCornerY);

		// Sets the text properties, color and font.
		g.setColor(messageColor);
		g.setFont(messagefont);

		// Draw our message
		g.drawString(message, x, scrollZoneTopLeftCornerY + textHeight);

		// Fill the borders
		g.setColor(appletBackgroundColor);
		g.fillRect(0, 0, this.getWidth(), scrollZoneTopLeftCornerY);
		g.fillRect(0, scrollZoneBottomRightCornerY, this.getWidth(), this
				.getHeight());
		g.fillRect(0, 0, scrollZoneTopLeftCornerX, this.getHeight());
		g.fillRect(scrollZoneBottomRightCornerX, 0, this.getWidth(), this
				.getHeight());
	}

	/**
	 * @see java.lang.Runnable#run()
	 */
	public void run() {

		while (animationThread != null)
			updatePosition();

	}

	/**
	 * @see java.applet.Applet#start()
	 */
	@Override
	public void start() {

		// Initialize and start our annimation thread
		if (animationThread == null)
			animationThread = new Thread(this);

		animationThread.start();

	}

	/**
	 * @see java.applet.Applet#stop()
	 */
	@Override
	public void stop() {

		// Stop the animation Thread
		animationThread = null;

	}

	/**
	 * Get an integer parameter from the applet parameters
	 * 
	 * @param parameterName
	 *            The name of the parameter to retrieve
	 * @param parameter
	 *            The value of the default parameter
	 * @return The value of the parameter retrieved from the <param> tag or the
	 *         default parameter value if no <param name=parameterName/> has
	 *         been specified in the <applet> tag.
	 */
	private int getAppletParameterInt(String parameterName, int parameter) {

		int appletParameterInt;
		String appletParameterString = getParameter(parameterName);

		try {
			appletParameterInt = Integer.parseInt(appletParameterString);
		} catch (NumberFormatException e) {
			return parameter;
		}

		return appletParameterInt;
	}

	/**
	 * Retrieve the applet parameters
	 */
	private void getAppletParameters() {
		// Retrieve the message
		if (getParameter("message") != null)
			message = getParameter("message");

		// Retrieve the animation speed
		animationSpeed = getAppletParameterInt("animation_speed",
				animationSpeed);

		// Retrieve the scroll direction
		scrollDirection = Integer.parseInt(getParameter("scroll_direction"));

		// Retrieve the scroll zone background colors
		scrollZoneBackgroundColorRed = getAppletParameterInt(
				"scroll_zone_background_color_red",
				scrollZoneBackgroundColorRed);
		scrollZoneBackgroundColorGreen = getAppletParameterInt(
				"scroll_zone_background_color_green",
				scrollZoneBackgroundColorGreen);
		scrollZoneBackgroundColorBlue = getAppletParameterInt(
				"scroll_zone_background_color_blue",
				scrollZoneBackgroundColorBlue);

		// Retrieve the applet background colors
		appletBackgroundColorRed = getAppletParameterInt(
				"applet_background_color_red", appletBackgroundColorRed);
		appletBackgroundColorGreen = getAppletParameterInt(
				"applet_background_color_green", appletBackgroundColorGreen);
		appletBackgroundColorBlue = getAppletParameterInt(
				"applet_background_color_blue", appletBackgroundColorBlue);

		// Retrieve the text message colors
		messageColorRed = getAppletParameterInt("message_color_red",
				messageColorRed);
		messageColorGreen = getAppletParameterInt("message_color_green",
				messageColorGreen);
		messageColorBlue = getAppletParameterInt("message_color_blue",
				messageColorBlue);

		// Retrieve font properties
		if (getParameter("message_font_name") != null)
			messagefontName = getParameter("message_font_name");

		String fontStyleString = getParameter("message_font_style");
		if (fontStyleString != null)
			if (fontStyleString.equals("BOLD"))
				messageFontStyle = Font.BOLD;
			else
				if (fontStyleString.equals("ITALIC"))
					messageFontStyle = Font.ITALIC;
				else
					if (fontStyleString.equals("PLAIN"))
						messageFontStyle = Font.PLAIN;
					else
						if (fontStyleString.equals("BOLD_ITALIC"))
							messageFontStyle = Font.BOLD | Font.ITALIC;

		messageFontSize = getAppletParameterInt("message_font_size",
				messageFontSize);
	}

	/**
	 * Retrieve informations about applet parameters.
	 * 
	 * @see java.applet.Applet#getParameterInfo()
	 */
	public String[][] getParameterInfo() {
		String[][] info = {
				// Parameter Name Kind of Value Description
				{ "animation_speed", "int",
						"Speed of the animation (pause between applet updates) in milliseconds" },
				{ "applet_background_color_blue", "int",
						"Blue value for the applet background color" },
				{ "applet_background_color_green", "int",
						"Green value for the applet background color" },
				{ "applet_background_color_red", "int",
						"Red value for the applet background color" },
				{ "message_font_name", "String",
						"Font name for the message to display" },
				{ "message_font_size", "int",
						"Font size for the message to display" },
				{ "message_font_type", "String", "Font type for the message to display" },
				{ "message", "String", "The message to display" },
				{ "message_color_blue", "int",
						"Blue value for the message text color" },
				{ "message_color_green", "int",
						"Green value for the message texte color" },
				{ "message_color_red", "int",
						"Red value for the message text color" },
				{
						"scroll_direction",
						"int",
						"Direction of the scrolling, a positive"
								+ " value indicate left to right scrolling,"
								+ " negative value right from left" },
				{ "scroll_zone_background_color_blue", "int",
						"Blue value for the scroll zone backrgound color" },
				{ "scroll_zone_background_color_green", "int",
						"Green value for the scroll zone background color" },
				{ "scroll_zone_background_color_red", "int",
						"Red value for the scroll zone backrgound color" }, };

		return info;
	}

	/**
	 * Wait for 'animationSpeed' milliseconds and redraw the scene.
	 */
	private void pauseAnimation() {

		try {
			Thread.sleep(animationSpeed);
			repaint();
		} catch (InterruptedException ie) {
		}

	}

	/**
	 * Update the position of our message and redraw the the scene.
	 */
	private void updatePosition() {

		if (scrollDirection >= 0)
			for (x = (scrollZoneTopLeftCornerX - textWidth); x < scrollZoneBottomRightCornerX; x++)
				pauseAnimation();
		else
			for (x = scrollZoneBottomRightCornerX; x > (scrollZoneTopLeftCornerX - textWidth); x--)
				pauseAnimation();

	}
}

Télécharger le zip

05 août 2007 16:15:53 :

- Applet plus configurable - Correction d'un bug dans le scrolling