private void onPlotClicked(PointF point) {
// make sure the point lies within the graph area. we use gridrect
// because it accounts for margins and padding as well.
if (plot.containsPoint(point.x, point.y)) {
Number x = plot.getXVal(point);
Number y = plot.getYVal(point);
selection = null;
double xDistance = 0;
double yDistance = 0;
// find the closest value to the selection:
for (SeriesBundle<XYSeries, ? extends XYSeriesFormatter> sfPair :
plot.getRegistry().getSeriesAndFormatterList()) {
XYSeries series = sfPair.getSeries();
for (int i = 0; i < series.size(); i++) {
Number thisX = series.getX(i);
Number thisY = series.getY(i);
if (thisX != null && thisY != null) {
double thisXDistance = Region.measure(x, thisX).doubleValue();
double thisYDistance = Region.measure(y, thisY).doubleValue();
if (selection == null) {
selection = new Pair<>(i, series);
xDistance = thisXDistance;
yDistance = thisYDistance;
} else if (thisXDistance < xDistance) {
selection = new Pair<>(i, series);
xDistance = thisXDistance;
yDistance = thisYDistance;
} else if (thisXDistance == xDistance
&& thisYDistance < yDistance
&& thisY.doubleValue() >= y.doubleValue()) {
selection = new Pair<>(i, series);
xDistance = thisXDistance;
yDistance = thisYDistance;
}
}
}
}
} else {
// if the press was outside the graph area, deselect:
selection = null;
}
if (selection == null) {
selectionWidget.setText(NO_SELECTION_TXT);
} else {
selectionWidget.setText(
"Selected: "
+ selection.second.getTitle()
+ " Value: "
+ selection.second.getY(selection.first));
}
plot.redraw();
}
