FileDocCategorySizeDatePackage
BarChart.javaAPI DocSun JDK 1.4.2 Example11230Thu May 12 00:35:28 BST 2005None

BarChart

public class BarChart extends Applet
A simple bar chart demo
version
1.6
author
Sami Shaio
modified
06/21/00 Daniel Peek : refactored, comments

Fields Summary
private static final int
VERTICAL
private static final int
HORIZONTAL
private static final int
SOLID
private static final int
STRIPED
private int
orientation
private String
title
private Font
font
private FontMetrics
metrics
private int
fontHeight
private int
columns
private int[]
values
private Color[]
colors
private String[]
labels
private int[]
styles
private int
scale
private int
maxLabelWidth
private int
barSpacing
private int
maxValue
Constructors Summary
Methods Summary
public java.lang.StringgetAppletInfo()

        return "Title: Bar Chart \n"
            + "Author: Sami Shaio \n"
            + "A simple bar chart demo.";
public java.lang.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;
private voidgetSettings()

        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;
        }
public voidinit()


       
  
        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);
        }
public voidpaint(java.awt.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 voidpaintHorizontal(java.awt.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 voidpaintVertical(java.awt.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);
        }
private voidparseColor(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;
        }
private voidparseLabel(int i)

        String temp = getParameter("C" + (i+1) + "_label");
        if (temp==null) {
            labels[i] = "";
        } else {
            labels[i] = temp;
        }
        maxLabelWidth = Math.max(metrics.stringWidth
                                 ((String) (labels[i])), maxLabelWidth);
private voidparseStyle(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 voidparseValue(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]);