/// <summary>
/// Computes the specified spectral value.
/// </summary>
/// <param name="rowIndex">The zero-based row index of the value.</param>
/// <param name="columnIndex">The zero-based column index of the value.</param>
/// <param name="bandIndex">The zero-based band index of the value.</param>
/// <returns>The spectral value at the specified index.</returns>
protected override UInt32 Compute(Int32 rowIndex, Int32 columnIndex, Int32 bandIndex)
{
Segment segment = _segmentCollection.GetSegment(rowIndex, columnIndex);
if (!_segmentToIndexDictionary.ContainsKey(segment))
{
return(0);
}
Int32 referenceIndex = _segmentToIndexDictionary[segment];
return(_referenceGeometry.Raster.GetValue(referenceIndex / _referenceGeometry.Raster.NumberOfColumns, referenceIndex % _referenceGeometry.Raster.NumberOfColumns, bandIndex));
}
public void SegmentCollectionGetSegmentTest()
{
// test for all indices
for (Int32 rowIndex = 0; rowIndex < _raster.Object.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < _raster.Object.NumberOfColumns; columnIndex++)
{
Segment segment = _collection.GetSegment(rowIndex, columnIndex);
Assert.AreEqual(1, segment.Count);
Assert.AreEqual(_raster.Object.NumberOfBands, segment.NumberOfBands);
Assert.AreEqual(_raster.Object.NumberOfColumns * _raster.Object.NumberOfRows, _collection.Count);
Assert.IsTrue(_collection.Contains(segment));
}
}
// test repeating queries
Random random = new Random(0);
for (Int32 queryIndex = 0; queryIndex < 10; queryIndex++)
{
Int32 rowIndex = random.Next(0, _raster.Object.NumberOfRows);
Int32 columnIndex = random.Next(0, _raster.Object.NumberOfColumns);
Segment segment = _collection.GetSegment(rowIndex, columnIndex);
Segment otherSegment = _collection.GetSegment(rowIndex, columnIndex);
Assert.AreEqual(segment, otherSegment);
for (Int32 otherQueryIndex = 0; otherQueryIndex < 10; otherQueryIndex++)
{
otherSegment = _collection.GetSegment(random.Next(0, _raster.Object.NumberOfRows), random.Next(0, _raster.Object.NumberOfColumns));
}
otherSegment = _collection.GetSegment(rowIndex, columnIndex);
Assert.AreEqual(segment, otherSegment);
}
// exceptions
Assert.Throws <ArgumentOutOfRangeException>(() => _collection.GetSegment(-1, 0));
Assert.Throws <ArgumentOutOfRangeException>(() => _collection.GetSegment(0, -1));
Assert.Throws <ArgumentOutOfRangeException>(() => _collection.GetSegment(_raster.Object.NumberOfRows, 0));
Assert.Throws <ArgumentOutOfRangeException>(() => _collection.GetSegment(0, _raster.Object.NumberOfColumns));
}
public void SegmentCollectionMergeSegmentsTest()
{
// merge using segments
SegmentCollection collection = new SegmentCollection(_raster.Object);
Segment segment = collection.GetSegment(0, 0);
Int32 count = collection.Count;
for (Int32 rowIndex = 0; rowIndex < _raster.Object.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < _raster.Object.NumberOfColumns; columnIndex++)
{
Segment otherSegment = collection.GetSegment(rowIndex, columnIndex);
collection.MergeSegments(segment, otherSegment);
Assert.IsFalse(segment != otherSegment && collection.Contains(segment) && collection.Contains(otherSegment));
segment = collection.GetSegment(rowIndex, columnIndex);
Assert.AreEqual(count, collection.Count);
count--;
}
}
Assert.AreEqual(_raster.Object.NumberOfColumns * _raster.Object.NumberOfRows, segment.Count);
// merge using segment and indices
collection = new SegmentCollection(_raster.Object);
segment = collection.GetSegment(0, 0);
count = collection.Count;
for (Int32 rowIndex = 0; rowIndex < _raster.Object.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < _raster.Object.NumberOfColumns; columnIndex++)
{
collection.MergeSegments(segment, rowIndex, columnIndex);
Segment otherSegment = collection.GetSegment(rowIndex, columnIndex);
Assert.AreEqual(segment, otherSegment);
Assert.AreEqual(count, collection.Count);
count--;
}
}
Assert.AreEqual(_raster.Object.NumberOfColumns * _raster.Object.NumberOfRows, segment.Count);
// merge using indices
collection = new SegmentCollection(_raster.Object);
segment = collection.GetSegment(0, 0);
count = collection.Count;
for (Int32 rowIndex = 0; rowIndex < _raster.Object.NumberOfRows; rowIndex++)
{
for (Int32 columnIndex = 0; columnIndex < _raster.Object.NumberOfColumns; columnIndex++)
{
collection.MergeSegments(0, 0, rowIndex, columnIndex);
Segment otherSegment = collection.GetSegment(rowIndex, columnIndex);
Assert.AreEqual(segment, otherSegment);
Assert.AreEqual(count, collection.Count);
count--;
}
}
Assert.AreEqual(_raster.Object.NumberOfColumns * _raster.Object.NumberOfRows, segment.Count);
}
