public virtual void EventOccurred(IEventData data, EventType type)
{
if (type.Equals(EventType.RENDER_TEXT))
{
TextRenderInfo renderInfo = (TextRenderInfo)data;
LineSegment segment = renderInfo.GetBaseline();
if (renderInfo.GetRise() != 0)
{
// remove the rise from the baseline - we do this because the text from a super/subscript render operations should probably be considered as part of the baseline of the text the super/sub is relative to
Matrix riseOffsetTransform = new Matrix(0, -renderInfo.GetRise());
segment = segment.TransformBy(riseOffsetTransform);
}
if (useActualText)
{
CanvasTag lastTagWithActualText = lastTextRenderInfo != null?FindLastTagWithActualText(lastTextRenderInfo
.GetCanvasTagHierarchy()) : null;
if (lastTagWithActualText != null && lastTagWithActualText == FindLastTagWithActualText(renderInfo.GetCanvasTagHierarchy
()))
{
// Merge two text pieces, assume they will be in the same line
LocationTextExtractionStrategy.TextChunk lastTextChunk = locationalResult[locationalResult.Count - 1];
Vector mergedStart = new Vector(Math.Min(lastTextChunk.GetLocation().GetStartLocation().Get(0), segment.GetStartPoint
().Get(0)), Math.Min(lastTextChunk.GetLocation().GetStartLocation().Get(1), segment.GetStartPoint().Get
(1)), Math.Min(lastTextChunk.GetLocation().GetStartLocation().Get(2), segment.GetStartPoint().Get(2)));
Vector mergedEnd = new Vector(Math.Max(lastTextChunk.GetLocation().GetEndLocation().Get(0), segment.GetEndPoint
().Get(0)), Math.Max(lastTextChunk.GetLocation().GetEndLocation().Get(1), segment.GetEndPoint().Get(1)
), Math.Max(lastTextChunk.GetLocation().GetEndLocation().Get(2), segment.GetEndPoint().Get(2)));
LocationTextExtractionStrategy.TextChunk merged = new LocationTextExtractionStrategy.TextChunk(lastTextChunk
.GetText(), tclStrat.CreateLocation(renderInfo, new LineSegment(mergedStart, mergedEnd)));
locationalResult[locationalResult.Count - 1] = merged;
}
else
{
String actualText = renderInfo.GetActualText();
LocationTextExtractionStrategy.TextChunk tc = new LocationTextExtractionStrategy.TextChunk(actualText != null
? actualText : renderInfo.GetText(), tclStrat.CreateLocation(renderInfo, segment));
locationalResult.Add(tc);
}
}
else
{
LocationTextExtractionStrategy.TextChunk tc = new LocationTextExtractionStrategy.TextChunk(renderInfo.GetText
(), tclStrat.CreateLocation(renderInfo, segment));
locationalResult.Add(tc);
}
lastTextRenderInfo = renderInfo;
}
}
/// <summary>Determines if a space character should be inserted between a previous chunk and the current chunk.
/// </summary>
/// <remarks>
/// Determines if a space character should be inserted between a previous chunk and the current chunk.
/// This method is exposed as a callback so subclasses can fine time the algorithm for determining whether a space should be inserted or not.
/// By default, this method will insert a space if the there is a gap of more than half the font space character width between the end of the
/// previous chunk and the beginning of the current chunk. It will also indicate that a space is needed if the starting point of the new chunk
/// appears *before* the end of the previous chunk (i.e. overlapping text).
/// </remarks>
/// <param name="chunk">the new chunk being evaluated</param>
/// <param name="previousChunk">the chunk that appeared immediately before the current chunk</param>
/// <returns>true if the two chunks represent different words (i.e. should have a space between them). False otherwise.
/// </returns>
protected internal virtual bool IsChunkAtWordBoundary(LocationTextExtractionStrategy.TextChunk chunk, LocationTextExtractionStrategy.TextChunk
previousChunk)
{
return(chunk.GetLocation().IsAtWordBoundary(previousChunk.GetLocation()));
}
