Example usage for org.jfree.data.time TimeSeriesCollection getSurroundingItems

Introduction

In this page you can find the example usage for org.jfree.data.time TimeSeriesCollection getSurroundingItems.

Prototype

public int[] getSurroundingItems(int series, long milliseconds) 

Source Link

Document

Returns the indices of the two data items surrounding a particular millisecond value.

Usage

From source file:org.jfree.data.time.TimeSeriesCollectionTest.java

/**
 * Test the getSurroundingItems() method to ensure it is returning the
 * values we expect./*from  w ww .  j av a  2 s  .c o  m*/
 */
@Test
public void testGetSurroundingItems() {
    TimeSeries series = new TimeSeries("Series 1");
    TimeSeriesCollection collection = new TimeSeriesCollection(series);
    collection.setXPosition(TimePeriodAnchor.MIDDLE);

    // for a series with no data, we expect {-1, -1}...
    int[] result = collection.getSurroundingItems(0, 1000L);
    assertTrue(result[0] == -1);
    assertTrue(result[1] == -1);

    // now test with a single value in the series...
    Day today = new Day();
    long start1 = today.getFirstMillisecond();
    long middle1 = today.getMiddleMillisecond();
    long end1 = today.getLastMillisecond();

    series.add(today, 99.9);
    result = collection.getSurroundingItems(0, start1);
    assertTrue(result[0] == -1);
    assertTrue(result[1] == 0);

    result = collection.getSurroundingItems(0, middle1);
    assertTrue(result[0] == 0);
    assertTrue(result[1] == 0);

    result = collection.getSurroundingItems(0, end1);
    assertTrue(result[0] == 0);
    assertTrue(result[1] == -1);

    // now add a second value to the series...
    Day tomorrow = (Day) today.next();
    long start2 = tomorrow.getFirstMillisecond();
    long middle2 = tomorrow.getMiddleMillisecond();
    long end2 = tomorrow.getLastMillisecond();

    series.add(tomorrow, 199.9);
    result = collection.getSurroundingItems(0, start2);
    assertTrue(result[0] == 0);
    assertTrue(result[1] == 1);

    result = collection.getSurroundingItems(0, middle2);
    assertTrue(result[0] == 1);
    assertTrue(result[1] == 1);

    result = collection.getSurroundingItems(0, end2);
    assertTrue(result[0] == 1);
    assertTrue(result[1] == -1);

    // now add a third value to the series...
    Day yesterday = (Day) today.previous();
    long start3 = yesterday.getFirstMillisecond();
    long middle3 = yesterday.getMiddleMillisecond();
    long end3 = yesterday.getLastMillisecond();

    series.add(yesterday, 1.23);
    result = collection.getSurroundingItems(0, start3);
    assertTrue(result[0] == -1);
    assertTrue(result[1] == 0);

    result = collection.getSurroundingItems(0, middle3);
    assertTrue(result[0] == 0);
    assertTrue(result[1] == 0);

    result = collection.getSurroundingItems(0, end3);
    assertTrue(result[0] == 0);
    assertTrue(result[1] == 1);
}

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