AOL File Library: 12,000 to 12,999/12000.zip/AOLDLs/Online-Tools/Java-Applets/JAVAAPPS.lzh/JAVAAPPS/DYNARULE/DYNARULE.EXE/dynarule2.java

Java Source | 1996-03-11 | 3.9 KB | 146 lines

// dynarule2 - Scalable horizontal rule with moving image(s)

//

// (c) 1996 Tor Ringstad ([e-mail])

//

// $Id: dynarule2.java,v 1.1 1996/02/02 14:31:45 torhr Exp torhr $

// $Source: /home/stud/torhr/public_html/java/dynarule/RCS/dynarule2.java,v $

//

// This is the barebone version!



// Todo:

//   o Handle resizing

//   o Better color handling



import java.awt.*;

import java.lang.*;



public class dynarule2 extends java.applet.Applet implements Runnable {



  int xs,ys;      // x- and y-size of the applets window

  int size;       // the size (thickness) of the rule

  int dy;         // displacement of the line

  int num;        // number of copies of image

  Image img;      // holds the image

  Color fg,bg;    // foreground and background color

  Color lc,dc;    // light and dark color (calc'ed from foreground)

  float am,of;    // amplitude and offset

  float x;        // sine counter

  float dist;     // distance between images

  float speed;    // speed of the images (step on the sine curve)



  MediaTracker tracker = null;

  Image buffer_i = null;

  Graphics buffer_g = null;

  Thread kicker = null;

  float Pi2 = (float)(Math.PI * 2);



  public void init() {

    String s;

    tracker = new MediaTracker(this);



    xs = size().width;

    ys = size().height;

    s = getParameter("img");

    img = getImage(getDocumentBase(), s);

    tracker.addImage(img,0);

    s = getParameter("size");

    size = (s == null) ? 1 : Integer.valueOf(s).intValue();

    s = getParameter("num");

    num = (s == null) ? 1 : Integer.valueOf(s).intValue();

    s = getParameter("dy");

    dy = (s == null) ? 50 : Integer.valueOf(s).intValue();

    s = getParameter("dist");

    dist = (s == null) ? 1 : Float.valueOf(s).floatValue();

    s = getParameter("speed");

    speed = (s == null) ? Pi2/400 : Float.valueOf(s).floatValue();



    s = getParameter("bgcolor");

    bg = (s == null) ? getBackground() :

                       new Color(Integer.valueOf(s,16).intValue());

    s = getParameter("fgcolor");

    fg = (s == null) ? bg :

                       new Color(Integer.valueOf(s,16).intValue());

    lc = fg.brighter();

    dc = fg.darker();



    buffer_i = createImage(size().width,size().height);

    buffer_g = buffer_i.getGraphics();

  }



  public void start() {

    try {

      showStatus("dynarule2: Loading image...");

      tracker.waitForID(0);

      showStatus("");

    } catch (InterruptedException c) {

      showStatus("dynarule2: Image loading interrupted");

      return;

    }



    am = (xs - img.getWidth(this)) / 2;

    of = am;

    x = 0;



    if (kicker==null) {

      kicker=new Thread(this);

      kicker.start();

    }

  }



  public void stop() {

    if (kicker != null) {

      kicker.stop();

      kicker = null;

    }

  }



  public void run() {

    while(true) {

      x += speed;

      if (x > Pi2) x -= Pi2;

      repaint();

      try {kicker.sleep(15);} catch (InterruptedException e) {}

    }

  }



  public void paint(Graphics g) {



    // Clear the entire background



    buffer_g.setColor(bg);

    buffer_g.fillRect(0,0,xs,ys);



    // Draw the rule



    buffer_g.setColor(lc);

    buffer_g.drawLine(xs-1,dy+size,0,dy+size);

    buffer_g.drawLine(xs-1,dy+size,xs-1,dy);

    buffer_g.setColor(dc);

    buffer_g.drawLine(0,dy,xs-1,dy);

    buffer_g.drawLine(0,dy,0,dy+size);



    // Draw all the images



    float xb = x;

    for(int a = 0; a < num; a++) {

      int xpos = (int)(Math.sin(xb)*am + of);

      buffer_g.drawImage(img,xpos,0,this);

      xb += dist;

    }



    // Copy the offscreen working area to the visible one



    g.drawImage(buffer_i,0,0,this);

  }



  public final synchronized void update(Graphics g) {

    paint(g);

  }





}