Java Programmer's Toolkit/Java Programmer's Toolkit.iso/applets/graphs/displa~1.jav

Text File | 1995-10-31 | 5KB | 199 lines

/*
 * Copyright (c) 1994-1995 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL or COMMERCIAL purposes and
 * without fee is hereby granted.
 * Please refer to the file http://java.sun.com/copy_trademarks.html
 * for further important copyright and trademark information and to
 * http://java.sun.com/licensing.html for further important licensing
 * information for the Java (tm) Technology.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 *
 * THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
 * CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE
 * PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT
 * NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE
 * SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
 * SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE
 * PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES").  SUN
 * SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR
 * HIGH RISK ACTIVITIES.
 */

import java.lang.*;
import java.io.InputStream;
import java.awt.*;
import java.net.*;
import java.util.*;

/**
 * A image loop applet, first raise smiles and then drop them
 *
 * @author      Siebe R. Brouwer
 * version      1.1, 29 September 1995
 */

// class Display, display prints the empty diagram to the screen
class Display extends Panel {

    protected String header;
    protected String yText;
    protected String xText;
    protected int xTop;
    protected int yTop;
    protected int xGap;
    protected int yGap;
    protected int xStart;
    protected int yStart;
    protected Diagram diagram;
    protected int moved;
    protected Scrollbar scrollbar;

    //constructor
    Display(String h, String xT, String yT, int xC,int yC) {
    header = h;
    xStart = 50;
    xGap= xC;
    yGap= yC;
    yText = yT;
    xText = xT;
        moved = 0;
        setLayout(new BorderLayout());
    scrollbar = new Scrollbar(0);
    scrollbar.setValues(0, 50,-1000,1000);
    add("South",scrollbar);
    }

    // draw a new diagram
    public void drawDiagram(Diagram d) {
    diagram = d;
    repaint();
    }

    // overwrite the paint method
    public void paint(Graphics g) {
    moved = scrollbar.getValue() * -1;
    int gaps = getCaps(moved);
    int left = getLeft(gaps, moved);
    yStart = yStart();
    xTop = xTop();
    yTop = yTop();
    scrollbar.reshape(xStart, yStart +40, xTop - xStart, 15);
    drawAxiss(g, left);
    g.drawString(header, xStart, 40);
    g.drawString(xText, xTop - 100, yStart +30);
    g.drawString(yText, 10, yTop - 15);
    diagram.drawData(g, gaps, left, moved);
    }

    /* draw the x-axis and y-axis to the screen
     * including the markers on the axis.
     */
       protected void drawAxiss(Graphics g, int left) {
    yStart = yStart();
     g.drawLine(xStart, yStart, xTop, yStart);
    g.drawLine(xStart, yStart, xStart, yTop);
    int j=((left <0)?xGap+left:left);
    for(int i = j+xStart; i <= xTop; i += xGap) {
        g.drawLine(i, yStart, i, yStart + 5);
    }
    for(int i = yStart; i >= yTop; i -= yGap) {
        g.drawLine(xStart, i, xStart-5, i);
    }
    }

    // if the scrollbar has been used than repaint.
    public boolean handleEvent(Event evt) {
    switch(evt.id) {
      case Event.SCROLL_ABSOLUTE:
        repaint();
        return true;
      case Event.SCROLL_LINE_DOWN:
        repaint();
        return true;
          case Event.SCROLL_LINE_UP:
        repaint();
        return true;
      case Event.SCROLL_PAGE_UP:
        repaint();
        return true;
      case Event.SCROLL_PAGE_DOWN:
        repaint();
        return true;
    }
    return false;
    }

    // return the number of gaps that are in the moved
    protected int getCaps(int moved) {
        if(moved > xGap|| moved < (xGap* -1)) {
        return moved / xGap;
    }

    return 0;
    }

    // return whats left between number of Gaps and moved
    protected int getLeft(int gaps, int moved) {
        return (moved - (gaps * xGap));
    }

    // set the scrollbar to the desired values
    public void setScrollbar(int value, int visible,int min, int max) {
        scrollbar.setValues(value, visible, min, max);
    }

    // return xGap
    public int xGap() {
        return xGap;
    }

    // return yGap
    public int yGap() {
        return yGap;
    }

    // return the xStart
    public int xStart() {
    return xStart;
    }

    // return yStart
    public int yStart() {
    return size().height - 70;
    }

    // return yTop
    public int yTop() {
        return 100;
    }

    // return xTop
    public int xTop() {
    return size().width - 50;
    }
}


/* Abstract class Diagram, all diagrams used by Display have as parrent
 * this class.
 */
abstract class Diagram {

    protected Display display;
    abstract void drawData(Graphics g,int Gaps, int left, int moved);
}