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/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
import java.awt.*;
/**
* A simple bar chart demo
* @author Sami Shaio
* @modified 06/21/00 Daniel Peek : refactored, comments
*/
@SuppressWarnings("serial")
public class BarChart extends java.applet.Applet {
private static final int VERTICAL = 0;
private static final int HORIZONTAL = 1;
private static final int SOLID = 0;
private static final int STRIPED = 1;
private int orientation;
private String title;
private Font font;
private FontMetrics metrics;
private int columns;
private int values[];
private Color colors[];
private String labels[];
private int styles[];
private int scale = 10;
private int maxLabelWidth = 0;
private int barSpacing = 10;
private int maxValue = 0;
@Override
public void init() {
getSettings();
values = new int[columns];
labels = new String[columns];
styles = new int[columns];
colors = new Color[columns];
for (int i = 0; i < columns; i++) {
parseValue(i);
parseLabel(i);
parseStyle(i);
parseColor(i);
}
}
private void getSettings() {
font = new java.awt.Font("Monospaced", Font.BOLD, 12);
metrics = getFontMetrics(font);
title = getParameter("title");
if (title == null) {
title = "Chart";
}
String temp = getParameter("columns");
if (temp == null) {
columns = 5;
} else {
columns = Integer.parseInt(temp);
}
temp = getParameter("scale");
if (temp == null) {
scale = 10;
} else {
scale = Integer.parseInt(temp);
}
temp = getParameter("orientation");
if (temp == null) {
orientation = VERTICAL;
} else if (temp.equalsIgnoreCase("horizontal")) {
orientation = HORIZONTAL;
} else {
orientation = VERTICAL;
}
}
private void parseValue(int i) {
String temp = getParameter("C" + (i + 1));
try {
values[i] = Integer.parseInt(temp);
} catch (NumberFormatException e) {
values[i] = 0;
} catch (NullPointerException e) {
values[i] = 0;
}
maxValue = Math.max(maxValue, values[i]);
}
private void parseLabel(int i) {
String temp = getParameter("C" + (i + 1) + "_label");
if (temp == null) {
labels[i] = "";
} else {
labels[i] = temp;
}
maxLabelWidth = Math.max(metrics.stringWidth(labels[i]), maxLabelWidth);
}
private void parseStyle(int i) {
String temp = getParameter("C" + (i + 1) + "_style");
if (temp == null || temp.equalsIgnoreCase("solid")) {
styles[i] = SOLID;
} else if (temp.equalsIgnoreCase("striped")) {
styles[i] = STRIPED;
} else {
styles[i] = SOLID;
}
}
private void parseColor(int i) {
String temp = getParameter("C" + (i + 1) + "_color");
if (temp != null) {
temp = temp.toLowerCase();
if (temp.equals("red")) {
colors[i] = Color.red;
} else if (temp.equals("green")) {
colors[i] = Color.green;
} else if (temp.equals("blue")) {
colors[i] = Color.blue;
} else if (temp.equals("pink")) {
colors[i] = Color.pink;
} else if (temp.equals("orange")) {
colors[i] = Color.orange;
} else if (temp.equals("magenta")) {
colors[i] = Color.magenta;
} else if (temp.equals("cyan")) {
colors[i] = Color.cyan;
} else if (temp.equals("white")) {
colors[i] = Color.white;
} else if (temp.equals("yellow")) {
colors[i] = Color.yellow;
} else if (temp.equals("gray")) {
colors[i] = Color.gray;
} else if (temp.equals("darkgray")) {
colors[i] = Color.darkGray;
} else {
colors[i] = Color.gray;
}
} else {
colors[i] = Color.gray;
}
}
@Override
public void paint(Graphics g) {
// draw the title centered at the bottom of the bar graph
g.setColor(Color.black);
g.setFont(font);
g.drawRect(0, 0, getSize().width - 1, getSize().height - 1);
int titleWidth = metrics.stringWidth(title);
int cx = Math.max((getSize().width - titleWidth) / 2, 0);
int cy = getSize().height - metrics.getDescent();
g.drawString(title, cx, cy);
// draw the bars and their titles
if (orientation == HORIZONTAL) {
paintHorizontal(g);
} else { // VERTICAL
paintVertical(g);
}
}
private void paintHorizontal(Graphics g) {
// x and y coordinates to draw/write to
int cx, cy;
int barHeight = metrics.getHeight();
for (int i = 0; i < columns; i++) {
// set the X coordinate for this bar and label and center it
int widthOfItems = maxLabelWidth + 3 + (maxValue * scale) + 5
+ metrics.stringWidth(Integer.toString(maxValue));
cx = Math.max((getSize().width - widthOfItems) / 2, 0);
// set the Y coordinate for this bar and label
cy = getSize().height - metrics.getDescent() - metrics.getHeight()
- barSpacing
- ((columns - i - 1) * (barSpacing + barHeight));
// draw the label
g.setColor(Color.black);
g.drawString(labels[i], cx, cy);
cx += maxLabelWidth + 3;
// draw the shadow
g.fillRect(cx + 4, cy - barHeight + 4,
(values[i] * scale), barHeight);
// draw the bar
g.setColor(colors[i]);
if (styles[i] == STRIPED) {
for (int k = 0; k <= values[i] * scale; k += 2) {
g.drawLine(cx + k, cy - barHeight, cx + k, cy);
}
} else { // SOLID
g.fillRect(cx, cy - barHeight,
(values[i] * scale) + 1, barHeight + 1);
}
cx += (values[i] * scale) + 4;
// draw the value at the end of the bar
g.setColor(g.getColor().darker());
g.drawString(Integer.toString(values[i]), cx, cy);
}
}
private void paintVertical(Graphics g) {
int barWidth = maxLabelWidth;
for (int i = 0; i < columns; i++) {
// X coordinate for this label and bar (centered)
int widthOfItems = (barWidth + barSpacing) * columns - barSpacing;
int cx = Math.max((getSize().width - widthOfItems) / 2, 0);
cx += (maxLabelWidth + barSpacing) * i;
// Y coordinate for this label and bar
int cy = getSize().height - metrics.getHeight()
- metrics.getDescent() - 4;
// draw the label
g.setColor(Color.black);
g.drawString(labels[i], cx, cy);
cy -= metrics.getHeight() - 3;
// draw the shadow
g.fillRect(cx + 4, cy - (values[i] * scale) - 4,
barWidth, (values[i] * scale));
// draw the bar
g.setColor(colors[i]);
if (styles[i] == STRIPED) {
for (int k = 0; k <= values[i] * scale; k += 2) {
g.drawLine(cx, cy - k,
cx + barWidth, cy - k);
}
} else {
g.fillRect(cx, cy - (values[i] * scale),
barWidth + 1, (values[i] * scale) + 1);
}
cy -= (values[i] * scale) + 5;
// draw the value on top of the bar
g.setColor(g.getColor().darker());
g.drawString(Integer.toString(values[i]), cx, cy);
}
}
@Override
public String getAppletInfo() {
return "Title: Bar Chart \n"
+ "Author: Sami Shaio \n"
+ "A simple bar chart demo.";
}
@Override
public String[][] getParameterInfo() {
String[][] info = {
{ "title", "string", "The title of bar graph. Default is 'Chart'" },
{ "scale", "int", "The scale of the bar graph. Default is 10." },
{ "columns", "int", "The number of columns/rows. Default is 5." },
{ "orientation", "{VERTICAL, HORIZONTAL}",
"The orienation of the bar graph. Default is VERTICAL." },
{ "c#", "int", "Subsitute a number for #. "
+ "The value/size of bar #. Default is 0." },
{ "c#_label", "string", "The label for bar #. "
+ "Default is an empty label." },
{ "c#_style", "{SOLID, STRIPED}", "The style of bar #. "
+ "Default is SOLID." },
{ "c#_color", "{RED, GREEN, BLUE, PINK, ORANGE, MAGENTA, CYAN, "
+ "WHITE, YELLOW, GRAY, DARKGRAY}",
"The color of bar #. Default is GRAY." }
};
return info;
}
}