Chartpublic class Chart extends Applet
| Fields Summary |
|---|
| static final int | VERTICAL | | static final int | HORIZONTAL | | static final int | SOLID | | static final int | STRIPED | | int | orientation | | String | title | | Font | titleFont | | FontMetrics | titleFontMetrics | | int | titleHeight | | int | columns | | int[] | values | | Object[] | colors | | Object[] | labels | | int[] | styles | | int | scale | | int | maxLabelWidth | | int | barWidth | | int | barSpacing | | int | max |
| Methods Summary |
|---|
| 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(java.awt.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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