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37
40
41 import java.awt.*;
42
43
49 public class BarChart extends java.applet.Applet  {
50 private static final int VERTICAL = 0;
51 private static final int HORIZONTAL = 1;
52
53 private static final int SOLID = 0;
54 private static final int STRIPED = 1;
55
56 private int orientation;
57 private String title;
58 private Font font;
59 private FontMetrics metrics;
60 private int fontHeight = 15;
61 private int columns;
62 private int values[];
63 private Color colors[];
64 private String labels[];
65 private int styles[];
66 private int scale = 10;
67 private int maxLabelWidth = 0;
68 private int barSpacing = 10;
69 private int maxValue = 0;
70
71 public void init() {
72
73 getSettings();
74
75 values = new int[columns];
76 labels = new String [columns];
77 styles = new int[columns];
78 colors = new Color[columns];
79
80 for (int i=0; i < columns; i++) {
81 parseValue(i);
82 parseLabel(i);
83 parseStyle(i);
84 parseColor(i);
85 }
86 }
87
88 private void getSettings() {
89 font = new java.awt.Font ("Monospaced", Font.BOLD, 12);
90 metrics = getFontMetrics(font);
91
92 title = getParameter("title");
93 if (title == null) {
94 title = "Chart";
95 }
96
97 String temp = getParameter("columns");
98 if (temp == null) {
99 columns = 5;
100 } else {
101 columns = Integer.parseInt(temp);
102 }
103
104 temp = getParameter("scale");
105 if (temp == null) {
106 scale = 10;
107 } else {
108 scale = Integer.parseInt(temp);
109 }
110
111 temp = getParameter("orientation");
112 if (temp == null) {
113 orientation = VERTICAL;
114 } else if (temp.equalsIgnoreCase("horizontal")) {
115 orientation = HORIZONTAL;
116 } else {
117 orientation = VERTICAL;
118 }
119 }
120
121 private void parseValue(int i) {
122 String temp = getParameter("C" + (i+1));
123 try {
124 values[i] = Integer.parseInt(temp);
125 } catch (NumberFormatException e) {
126 values[i] = 0;
127 } catch (NullPointerException e) {
128 values[i] = 0;
129 }
130 maxValue = Math.max(maxValue, values[i]);
131 }
132
133 private void parseLabel(int i) {
134 String temp = getParameter("C" + (i+1) + "_label");
135 if (temp==null) {
136 labels[i] = "";
137 } else {
138 labels[i] = temp;
139 }
140 maxLabelWidth = Math.max(metrics.stringWidth
141 ((String ) (labels[i])), maxLabelWidth);
142 }
143
144 private void parseStyle(int i) {
145 String temp = getParameter("C" + (i+1) + "_style");
146 if (temp == null || temp.equalsIgnoreCase("solid")) {
147 styles[i] = SOLID;
148 } else if (temp.equalsIgnoreCase("striped")) {
149 styles[i] = STRIPED;
150 } else {
151 styles[i] = SOLID;
152 }
153 }
154
155 private void parseColor(int i) {
156 String temp = getParameter("C" + (i+1) + "_color");
157 if (temp != null) {
158 temp = temp.toLowerCase();
159 if (temp.equals("red")) {
160 colors[i] = Color.red;
161 } else if (temp.equals("green")) {
162 colors[i] = Color.green;
163 } else if (temp.equals("blue")) {
164 colors[i] = Color.blue;
165 } else if (temp.equals("pink")) {
166 colors[i] = Color.pink;
167 } else if (temp.equals("orange")) {
168 colors[i] = Color.orange;
169 } else if (temp.equals("magenta")) {
170 colors[i] = Color.magenta;
171 } else if (temp.equals("cyan")) {
172 colors[i] = Color.cyan;
173 } else if (temp.equals("white")) {
174 colors[i] = Color.white;
175 } else if (temp.equals("yellow")) {
176 colors[i] = Color.yellow;
177 } else if (temp.equals("gray")) {
178 colors[i] = Color.gray;
179 } else if (temp.equals("darkgray")) {
180 colors[i] = Color.darkGray;
181 } else {
182 colors[i] = Color.gray;
183 }
184 } else {
185 colors[i] = Color.gray;
186 }
187 }
188
189 public void paint(Graphics g) {
190 g.setColor(Color.black);
192 g.setFont(font);
193
194 g.drawRect(0, 0, getSize().width - 1, getSize().height - 1);
195
196 int titleWidth = metrics.stringWidth(title);
197 int cx = Math.max((getSize().width - titleWidth) / 2, 0);
198 int cy = getSize().height - metrics.getDescent();
199 g.drawString(title, cx, cy);
200
201 if(orientation == HORIZONTAL) {
203 paintHorizontal(g);
204 } else { paintVertical(g);
206 }
207 }
208
209 private void paintHorizontal(Graphics g) {
210 int cx, cy;
212 int barHeight = metrics.getHeight();
213
214 for (int i = 0; i < columns; i++) {
215
216 int widthOfItems = maxLabelWidth + 3 + (maxValue * scale) + 5
218 + metrics.stringWidth(Integer.toString(maxValue));
219 cx = Math.max((getSize().width - widthOfItems) / 2, 0);
220
221 cy = getSize().height - metrics.getDescent() - metrics.getHeight()
223 - barSpacing - ((columns - i - 1) * (barSpacing + barHeight));
224
225 g.setColor(Color.black);
227 g.drawString(labels[i], cx, cy);
228 cx += maxLabelWidth + 3;
229
230
231 g.fillRect(cx + 4, cy - barHeight + 4,
233 (values[i] * scale), barHeight);
234
235 g.setColor(colors[i]);
237 if (styles[i] == STRIPED) {
238 for (int k = 0; k <= values[i] * scale; k += 2) {
239 g.drawLine(cx + k, cy - barHeight, cx + k, cy);
240 }
241 } else { g.fillRect(cx, cy - barHeight,
243 (values[i] * scale) + 1, barHeight + 1);
244 }
245 cx += (values[i] * scale) + 4;
246
247 g.setColor(g.getColor().darker());
249 g.drawString(Integer.toString(values[i]), cx, cy);
250 }
251 }
252
253 private void paintVertical(Graphics g) {
254 int barWidth = maxLabelWidth;
255
256 for (int i = 0; i < columns; i++) {
257
258 int widthOfItems = (barWidth + barSpacing) * columns - barSpacing;
260 int cx = Math.max((getSize().width - widthOfItems) / 2, 0);
261 cx += (maxLabelWidth + barSpacing) * i;
262
263 int cy = getSize().height - metrics.getHeight()
265 - metrics.getDescent() - 4;
266
267 g.setColor(Color.black);
269 g.drawString(labels[i], cx, cy);
270 cy -= metrics.getHeight() - 3;
271
272 g.fillRect(cx + 4, cy - (values[i] * scale) - 4,
274 barWidth, (values[i] * scale));
275
276 g.setColor(colors[i]);
278 if (styles[i] == STRIPED) {
279 for (int k=0; k <= values[i] * scale; k+=2) {
280 g.drawLine(cx, cy - k,
281 cx + barWidth, cy - k);
282 }
283 } else {
284 g.fillRect(cx, cy - (values[i] * scale),
285 barWidth + 1, (values[i] * scale) + 1);
286 }
287 cy -= (values[i] * scale) + 5;
288
289 g.setColor(g.getColor().darker());
291 g.drawString(Integer.toString(values[i]), cx, cy);
292 }
293 }
294
295 public String getAppletInfo() {
296 return "Title: Bar Chart \n"
297 + "Author: Sami Shaio \n"
298 + "A simple bar chart demo.";
299 }
300
301 public String [][] getParameterInfo() {
302 String [][] info = {
303 {"title", "string", "The title of bar graph. Default is 'Chart'"},
304 {"scale", "int", "The scale of the bar graph. Default is 10."},
305 {"columns", "int", "The number of columns/rows. Default is 5."},
306 {"orientation", "{VERTICAL, HORIZONTAL}",
307 "The orienation of the bar graph. Default is VERTICAL."},
308 {"c#", "int", "Subsitute a number for #. "
309 + "The value/size of bar #. Default is 0."},
310 {"c#_label", "string", "The label for bar #. "
311 + "Default is an empty label."},
312 {"c#_style", "{SOLID, STRIPED}", "The style of bar #. "
313 + "Default is SOLID."},
314 {"c#_color", "{RED, GREEN, BLUE, PINK, ORANGE, MAGENTA, CYAN, "
315 + "WHITE, YELLOW, GRAY, DARKGRAY}",
316 "The color of bar #. Default is GRAY."}
317 };
318 return info;
319 }
320 }
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