Chart
/*
* @(#)Chart.java 1.6f 95/03/27 Sami Shaio
*
* 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.awt.Graphics;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.io.*;
import java.lang.*;
import java.net.URL;
public class Chart extends java.applet.Applet {
static final int VERTICAL = 0;
static final int HORIZONTAL = 1;
static final int SOLID = 0;
static final int STRIPED = 1;
int orientation;
String title;
Font titleFont;
FontMetrics titleFontMetrics;
int titleHeight = 15;
int columns;
int values[];
Object colors[];
Object labels[];
int styles[];
int scale = 10;
int maxLabelWidth = 0;
int barWidth;
int barSpacing = 10;
int max = 0;
public synchronized void init() {
String rs;
titleFont = new java.awt.Font("Courier", Font.BOLD, 12);
titleFontMetrics = getFontMetrics(titleFont);
title = getParameter("title");
if (title == null) {
title = "Chart";
}
rs = getParameter("columns");
if (rs == null) {
columns = 5;
} else {
columns = Integer.parseInt(rs);
}
rs = getParameter("scale");
if (rs == null) {
scale = 10;
} else {
scale = Integer.parseInt(rs);
}
rs = getParameter("orientation");
if (rs == null) {
orientation = VERTICAL;
} else if (rs.toLowerCase().equals("vertical")) {
orientation = VERTICAL;
} else if (rs.toLowerCase().equals("horizontal")) {
orientation = HORIZONTAL;
} else {
orientation = VERTICAL;
}
values = new int[columns];
colors = new Color[columns];
labels = new String[columns];
styles = new int[columns];
for (int i=0; i < columns; i++) {
// parse the value for this column
rs = getParameter("C" + (i+1));
if (rs != null) {
try {
values[i] = Integer.parseInt(rs);
} catch (NumberFormatException e) {
values[i] = 0;
}
}
if (values[i] > max) {
max = values[i];
}
// parse the label for this column
rs = getParameter("C" + (i+1) + "_label");
labels[i] = (rs == null) ? "" : rs;
maxLabelWidth = Math.max(titleFontMetrics.stringWidth((String)(labels[i])),
maxLabelWidth);
// parse the bar style
rs = getParameter("C" + (i+1) + "_style");
if (rs == null || rs.toLowerCase().equals("solid")) {
styles[i] = SOLID;
} else if (rs.toLowerCase().equals("striped")) {
styles[i] = STRIPED;
} else {
styles[i] = SOLID;
}
// parse the color attribute for this column
rs = getParameter("C" + (i+1) + "_color");
if (rs != null) {
if (rs.equals("red")) {
colors[i] = Color.red;
} else if (rs.equals("green")) {
colors[i] = Color.green;
} else if (rs.equals("blue")) {
colors[i] = Color.blue;
} else if (rs.equals("pink")) {
colors[i] = Color.pink;
} else if (rs.equals("orange")) {
colors[i] = Color.orange;
} else if (rs.equals("magenta")) {
colors[i] = Color.magenta;
} else if (rs.equals("cyan")) {
colors[i] = Color.cyan;
} else if (rs.equals("white")) {
colors[i] = Color.white;
} else if (rs.equals("yellow")) {
colors[i] = Color.yellow;
} else if (rs.equals("gray")) {
colors[i] = Color.gray;
} else if (rs.equals("darkGray")) {
colors[i] = Color.darkGray;
} else {
colors[i] = Color.gray;
}
} else {
colors[i] = Color.gray;
}
}
switch (orientation) {
case VERTICAL:
default:
barWidth = maxLabelWidth;
resize(Math.max(columns * (barWidth + barSpacing),
titleFontMetrics.stringWidth(title)) +
titleFont.getSize() + 5,
(max * scale) + (2 * titleFont.getSize()) + 5 + titleFont.getSize());
break;
case HORIZONTAL:
barWidth = titleFont.getSize();
resize(Math.max((max * scale) + titleFontMetrics.stringWidth("" + max),
titleFontMetrics.stringWidth(title)) + maxLabelWidth + 5,
(columns * (barWidth + barSpacing)) + titleFont.getSize() + 10);
break;
}
}
public synchronized void paint(Graphics g) {
int i, j;
int cx, cy;
char l[] = new char[1];
// draw the title centered at the bottom of the bar graph
g.setColor(Color.black);
i = titleFontMetrics.stringWidth(title);
g.setFont(titleFont);
g.drawString(title, Math.max((size().width - i)/2, 0),
size().height - titleFontMetrics.getDescent());
for (i=0; i < columns; i++) {
switch (orientation) {
case VERTICAL:
default:
// set the next X coordinate to account for the label
// being wider than the bar size().width.
cx = (Math.max((barWidth + barSpacing),maxLabelWidth) * i) +
barSpacing;
// center the bar chart
cx += Math.max((size().width - (columns *
(barWidth + (2 * barSpacing))))/2,0);
// set the next Y coordinate to account for the size().height
// of the bar as well as the title and labels painted
// at the bottom of the chart.
cy = size().height - (values[i] * scale) - 1 - (2 * titleFont.getSize());
// draw the label
g.setColor(Color.black);
g.drawString((String)labels[i], cx,
size().height - titleFont.getSize() - titleFontMetrics.getDescent());
// draw the shadow bar
if (colors[i] == Color.black) {
g.setColor(Color.gray);
}
g.fillRect(cx + 5, cy - 3, barWidth, (values[i] * scale));
// draw the bar with the specified color
g.setColor((Color)(colors[i]));
switch (styles[i]) {
case SOLID:
default:
g.fillRect(cx, cy, barWidth, (values[i] * scale));
break;
case STRIPED:
{
int steps = (values[i] * scale) / 2;
int ys;
for (j=0; j < steps; j++) {
ys = cy + (2 * j);
g.drawLine(cx, ys, cx + barWidth, ys);
}
}
break;
}
g.drawString("" + values[i],
cx,
cy - titleFontMetrics.getDescent());
break;
case HORIZONTAL:
// set the Y coordinate
cy = ((barWidth + barSpacing) * i) + barSpacing;
// set the X coordinate to be the size().width of the widest
// label
cx = maxLabelWidth + 1;
cx += Math.max((size().width - (maxLabelWidth + 1 +
titleFontMetrics.stringWidth("" +
max) +
(max * scale))) / 2, 0);
// draw the labels and the shadow
g.setColor(Color.black);
g.drawString((String)labels[i], cx - maxLabelWidth - 1,
cy + titleFontMetrics.getAscent());
if (colors[i] == Color.black) {
g.setColor(Color.gray);
}
g.fillRect(cx + 3,
cy + 5,
(values[i] * scale),
barWidth);
// draw the bar in the current color
g.setColor((Color)(colors[i]));
switch (styles[i]) {
case SOLID:
default:
g.fillRect(cx,
cy,
(values[i] * scale),
barWidth);
break;
case STRIPED:
{
int steps = (values[i] * scale) / 2;
int ys;
for (j=0; j < steps; j++) {
ys = cx + (2 * j);
g.drawLine(ys, cy, ys, cy + barWidth);
}
}
break;
}
g.drawString("" + values[i],
cx + (values[i] * scale) + 3,
cy + titleFontMetrics.getAscent());
break;
}
}
}
}
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