Example usage for org.joda.time DurationField getDifference

Introduction

In this page you can find the example usage for org.joda.time DurationField getDifference.

Prototype

public abstract int getDifference(long minuendInstant, long subtrahendInstant);

Source Link

Document

Computes the difference between two instants, as measured in the units of this field.

Usage

From source file:de.openali.odysseus.chart.ext.base.axisrenderer.DateTimeTickCalculator.java

License:Open Source License

/**
 * Calculates the ticks shown for the given Axis
 *///from w w  w .  j a  v a 2  s.  co  m
@SuppressWarnings("rawtypes")
@Override
public Double[] calcTicks(final GC gc, final IAxis axis, final Number minDisplayInterval,
        final Point ticklabelSize) {
    final IDataRange<Number> numRange = axis.getNumericRange();
    if (numRange == null || numRange.getMin() == null || numRange.getMax() == null)
        return new Double[] {};

    final long start = numRange.getMin().longValue();
    final long end = numRange.getMax().longValue();

    final IDateTimeAxisField axisField = m_fieldTypeProvider.getDateTimeAxisField(numRange);

    final DateTimeZone jodaTZ = DateTimeZone.forTimeZone(KalypsoCorePlugin.getDefault().getTimeZone());
    final DurationField field = axisField.getFieldType().getDurationType()
            .getField(GregorianChronology.getInstance(jodaTZ));

    final int tickCount = Math.max(1, field.getDifference(end, start));
    final int maximumTickCount = axis.getScreenHeight() / (ticklabelSize.x + 2/* Pixel */);
    final int[] rollOvers = axisField.getRollovers();

    final int rollOver = calculateRollover(tickCount, maximumTickCount, rollOvers);

    final List<Double> ticks = new ArrayList<>();
    Long tick = getFirstRollValue(axisField, start, end);
    ticks.add(tick.doubleValue());
    while (tick < end) {
        tick = field.add(tick, rollOver);
        ticks.add(tick.doubleValue());
    }

    return ticks.toArray(new Double[ticks.size()]);
}

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