Method convertRangeToCurves

src/core/objects/object.cpp:2132–2229

}

PathPart::size_type PathObject::convertRangeToCurves(const PathPart& part, PathPart::size_type start_index, PathPart::size_type end_index)
{
	Q_ASSERT(end_index > start_index);
	
	Q_ASSERT(!coords[start_index].isCurveStart());
	coords[start_index].setCurveStart(true);
	
	// Special case: last coordinate
	MapCoord direction;
	if (end_index != part.last_index)
	{
		// Use direction of next segment
		direction = coords[end_index + 1] - coords[end_index];
	}
	else if (part.isClosed())
	{
		// Use average direction at close point
		direction = coords[part.first_index + 1] - coords[end_index - 1];
	}
	else
	{
		// Use direction of last segment
		direction = coords[end_index] - coords[end_index - 1];
	}
	
	MapCoordF tangent = MapCoordF(direction);
	tangent.normalize();
	
	MapCoord end_handle = coords[end_index];
	end_handle.setFlags(0);
	auto baseline = (coords[end_index] - coords[end_index - 1]).length() * BEZIER_HANDLE_DISTANCE;
	end_handle = end_handle - MapCoord(tangent * baseline);
	
	// Special case: first coordinate
	if (start_index != part.first_index)
	{
		// Use direction of previous segment
		direction = coords[start_index] - coords[start_index - 1];
	}
	else if (part.isClosed())
	{
		// Use average direction at close point
		direction = coords[start_index + 1] - coords[part.last_index - 1];
	}
	else
	{
		// Use direction of first segment
		direction = coords[start_index + 1] - coords[start_index];
	}
	
	tangent = MapCoordF(direction);
	tangent.normalize();
	
	MapCoord handle = coords[start_index];
	handle.setFlags(0);
	baseline = (coords[start_index + 1] - coords[start_index]).length() * BEZIER_HANDLE_DISTANCE;
	handle = handle + MapCoord(tangent * baseline);
	addCoordinate(start_index + 1, handle);