PieChartPainterpublic class PieChartPainter extends ChartPainter
| Fields Summary |
|---|
| protected static PieChartPainter | chartUI | | protected int | originX | | protected int | originY | | protected int | radius | | private static double | piby2 | | private static double | twopi | | private static double | d2r |
| Methods Summary |
|---|
| public static javax.swing.plaf.ComponentUI | createUI(javax.swing.JComponent c)
return chartUI;
| | public void | drawLabel(java.awt.Graphics g, java.lang.String text, double angle)
g.setFont(textFont);
g.setColor(textColor);
double radians = angle * d2r;
int x = (int) ((radius + 5) * Math.cos(radians));
int y = (int) ((radius + 5) * Math.sin(radians));
if (x < 0) {
x -= SwingUtilities.computeStringWidth(g.getFontMetrics(), text);
}
if (y < 0) {
y -= g.getFontMetrics().getHeight();
}
g.drawString(text, x + originX, originY - y);
| | public int | indexOfEntryAt(java.awt.event.MouseEvent me) // degrees to radians.
int x = me.getX() - originX;
int y = originY - me.getY(); // upside down coordinate system.
// is (x,y) in the circle?
if (Math.sqrt(x*x + y*y) > radius) { return -1; }
double percent = Math.atan2(Math.abs(y), Math.abs(x));
if (x >= 0) {
if (y <= 0) { // (IV)
percent = (piby2 - percent) + 3 * piby2; // (IV)
}
}
else {
if (y >= 0) { // (II)
percent = Math.PI - percent;
}
else { // (III)
percent = Math.PI + percent;
}
}
percent /= twopi;
double t = 0.0;
if (values != null) {
for (int i = 0; i < values.length; i++) {
if (t + values[i] > percent) {
return i;
}
t += values[i];
}
}
return -1;
| | public void | paint(java.awt.Graphics g, javax.swing.JComponent c)
Dimension size = c.getSize();
originX = size.width / 2;
originY = size.height / 2;
int diameter = (originX < originY ? size.width - 40
: size.height - 40);
radius = (diameter / 2) + 1;
int cornerX = (originX - (diameter / 2));
int cornerY = (originY - (diameter / 2));
int startAngle = 0;
int arcAngle = 0;
for (int i = 0; i < values.length; i++) {
arcAngle = (int)(i < values.length - 1 ?
Math.round(values[i] * 360) :
360 - startAngle);
g.setColor(colors[i % colors.length]);
g.fillArc(cornerX, cornerY, diameter, diameter,
startAngle, arcAngle);
drawLabel(g, labels[i], startAngle + (arcAngle / 2));
startAngle += arcAngle;
}
g.setColor(Color.black);
g.drawOval(cornerX, cornerY, diameter, diameter); // cap the circle
|
|
