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130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
// Copyright 2008, Google Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file contains the declaration of the GpxTrkPtHandler class.
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#ifndef KML_CONVENIENCE_GPX_TRK_PT_HANDLER_H__
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#define KML_CONVENIENCE_GPX_TRK_PT_HANDLER_H__
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#include <cstring> // strcmp
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#include "boost/scoped_ptr.hpp"
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#include "kml/base/attributes.h"
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#include "kml/base/expat_handler.h"
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#include "kml/base/vec3.h"
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namespace kmlconvenience {
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// Find all <trkpt>'s in the GPX file.
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// For example:
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// <trkpt lat="-33.911973070" lon="18.422974152">
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// <ele>4.943848</ele>
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// <time>2008-10-11T14:55:41Z</time>
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// </trkpt>
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// Each <trkpt> results in a call to HandlePoint().
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// Overall usage: Derive a class from GpxTrkPtHandler with an implementation of
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// HandlePoint().
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class GpxTrkPtHandler : public kmlbase::ExpatHandler {
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public:
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GpxTrkPtHandler()
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: time_("")
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, gather_char_data_(false)
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, char_data_("")
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{
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}
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// ExpatHandler::StartElement()
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virtual void StartElement(const string& name,
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const std::vector <string>& atts) {
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if (name.compare("trkpt") == 0) {
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// <trkpt lat="-33.911973070" lon="18.422974152">
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// If both lat and lon exist and are sane doubles create a Vec3 for
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// the point.
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boost::scoped_ptr<kmlbase::Attributes> attributes(
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kmlbase::Attributes::Create(atts));
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if (attributes.get()) {
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double latitude;
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double longitude;
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if (attributes->GetDouble("lat", &latitude) &&
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attributes->GetDouble("lon", &longitude)) {
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vec3_.reset(new kmlbase::Vec3(longitude, latitude));
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}
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}
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time_.clear();
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} else if (name.compare("time") == 0 ||
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name.compare("ele") == 0) {
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// <time>2008-10-11T14:55:41Z</time>
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// <ele>4.943848</ele>
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gather_char_data_ = true;
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char_data_.clear();
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}
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}
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// ExpatHandler::EndElement()
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virtual void EndElement(const string& name) {
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if (name.compare("trkpt") == 0) {
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// </trkpt>
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// If a Vec3 was created for this element call the handler.
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if (vec3_.get()) {
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HandlePoint(*vec3_, time_);
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}
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} else if (name.compare("time") == 0) {
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// <time>2008-10-11T14:55:41Z</time>
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time_ = char_data_;
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} else if (name.compare("ele") == 0) {
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// <ele>4.943848</ele>
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if (vec3_.get()) {
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vec3_->set_altitude(strtod(char_data_.c_str(), NULL));
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}
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}
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}
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// ExpatHandler::CharData()
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virtual void CharData(const string& str) {
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if (gather_char_data_) {
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char_data_.append(str);
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}
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}
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// This is called for each <trkpt>. This default implemenation does nothing.
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virtual void HandlePoint(const kmlbase::Vec3& where,
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const string& when) {
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};
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private:
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// A fresh Vec3 is created for each <trkpt>.
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boost::scoped_ptr<kmlbase::Vec3> vec3_;
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string time_;
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bool gather_char_data_;
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string char_data_;
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};
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} // end namespace kmlconvenience
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#endif // KML_CONVENIENCE_GPX_TRK_PT_HANDLER_H__
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