private IDrawableRuler computeScaler(final GanttRenderingData data) {
final Rectangle dataScreenArea = getDataArea(data);
if (data.isLog()) {
List<Span> spans = new ArrayList<Span>(Span.valueOfDurations(data.getDurations()));
if (data.getDurations().size() > 0) {
ITaskDuration first = data.getDurations().get(0);
ITaskDuration last = data.getDurations().get(data.getDurations().size() - 1);
Span emptyBefore = Span.valueOf(data.getLogspan().getStart(), first.getStartTime());
spans.add(0, emptyBefore);
Span emptyAfter =
Span.valueOf(last.getStartTime() + last.getDurationTime(), data.getLogspan().getEnd());
spans.add(emptyAfter);
}
return new FixedMidPointRuler(
dataScreenArea.x, dataScreenArea.width, data.getTransform(), data.getMarker(), spans);
} else {
long firstDuration = data.getLogspan().getStart();
long lastDuration = 0;
if (data.getMarker() <= 0) {
lastDuration = (long) (firstDuration + ((TIME_RANGE / data.getZoomLevel()) / 2));
} else {
firstDuration = (long) (data.getMarker() - ((TIME_RANGE / data.getZoomLevel()) / 2));
if (firstDuration < 0) {
firstDuration = data.getLogspan().getStart();
}
lastDuration = (long) (data.getMarker() + ((TIME_RANGE / data.getZoomLevel()) / 2));
}
return new SimpleLinearScaleRuler(
data.getMarker(),
Span.valueOf(firstDuration, lastDuration),
Span.valueOf(dataScreenArea.x, dataScreenArea.width));
}
}
