Program Listing for File mapviz_plugin.h

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// Copyright (c) 2014, Southwest Research Institute® (SwRI®)
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#ifndef MAPVIZ__MAPVIZ_PLUGIN_H_
#define MAPVIZ__MAPVIZ_PLUGIN_H_

// ROS libraries
#include <swri_transform_util/transform.h>
#include <swri_transform_util/transform_manager.h>
#include <rclcpp/rclcpp.hpp>
#include <tf2/transform_datatypes.h>
#include <tf2_ros/buffer.h>
#include <tf2_ros/transform_listener.h>

#include <mapviz/widgets.h>
#include <yaml-cpp/yaml.h>

// QT libraries
#include <QWidget>
#include <QGLWidget>
#include <QObject>

// C++ standard libraries
#include <memory>
#include <string>


#include "mapviz/stopwatch.h"

namespace mapviz
{
class MapvizPlugin : public QObject
{
  Q_OBJECT
public:
  ~MapvizPlugin() override = default;

  virtual bool Initialize(
      std::shared_ptr<tf2_ros::Buffer> tf_buffer,
      std::shared_ptr<tf2_ros::TransformListener> tf_listener,
      swri_transform_util::TransformManagerPtr tf_manager,
      QGLWidget* canvas)
  {
    tf_buf_ = tf_buffer;
    tf_ = tf_listener;
    tf_manager_ = tf_manager;
    return Initialize(canvas);
  }

  virtual void Shutdown() = 0;

  virtual void ClearHistory() {}

  virtual void Draw(double x, double y, double scale) = 0;

  virtual void Paint(QPainter* /* painter */, double /* x */,
                     double /* y */, double /* scale */) {}

  void SetUseLatestTransforms(bool value)
  {
    if (value != use_latest_transforms_) {
      use_latest_transforms_ = value;
      Q_EMIT UseLatestTransformsChanged(use_latest_transforms_);
    }
  }

  void SetName(const std::string& name) { name_ = name; }

  std::string Name() const { return name_; }

  void SetType(const std::string& type) { type_ = type; }

  std::string Type() const { return type_; }

  int DrawOrder() const { return draw_order_; }

  void SetDrawOrder(int order)
  {
    if (draw_order_ != order) {
      draw_order_ = order;
      Q_EMIT DrawOrderChanged(draw_order_);
    }
  }

  virtual void SetNode(rclcpp::Node& node)
  {
    // node_ = node;
    node_ = node.shared_from_this();
  }

  void DrawPlugin(double x, double y, double scale)
  {
    if (visible_ && initialized_) {
      meas_transform_.start();
      Transform();
      meas_transform_.stop();

      meas_draw_.start();
      Draw(x, y, scale);
      meas_draw_.stop();
    }
  }

  void PaintPlugin(QPainter* painter, double x, double y, double scale)
  {
    if (visible_ && initialized_) {
      meas_transform_.start();
      Transform();
      meas_transform_.stop();

      meas_paint_.start();
      Paint(painter, x, y, scale);
      meas_paint_.start();
    }
  }

  void SetTargetFrame(const std::string& frame_id)
  {
    if (frame_id != target_frame_) {
      target_frame_ = frame_id;

      meas_transform_.start();
      Transform();
      meas_transform_.stop();

      Q_EMIT TargetFrameChanged(target_frame_);
    }
  }

  bool Visible() const { return visible_; }

  void SetVisible(bool visible)
  {
    if (visible_ != visible) {
      visible_ = visible;
      Q_EMIT VisibleChanged(visible_);
    }
  }

  bool GetTransform(
    const rclcpp::Time& stamp,
    swri_transform_util::Transform& transform,
    bool use_latest_transforms = true)
  {
    return GetTransform(source_frame_, stamp, transform, use_latest_transforms);
  }

  bool GetTransform(const std::string& source,
    const rclcpp::Time& stamp,
    swri_transform_util::Transform& transform,
    bool use_latest_transforms = true)
  {
    if (!initialized_) {
      return false;
    }

    tf2::TimePoint time;
    rclcpp::Time now = node_->now();

    if (use_latest_transforms_ && use_latest_transforms) {
      time = tf2::TimePointZero;
    }
    else
    {
      time = tf2::timeFromSec(stamp.seconds());
    }

    if (tf_manager_->GetTransform(
        target_frame_,
        source,
        time,
        transform))
    {
      return true;
    } else if (time != tf2::TimePointZero) {
      rclcpp::Duration elapsed = now - stamp;

      if (elapsed.seconds() < 0.1)
      {
        // If the stamped transform failed because it is too recent, find the
        // most recent transform in the cache instead.
        if (tf_manager_->GetTransform(
            target_frame_,
            source,
            tf2::TimePointZero,
            transform))
        {
          return true;
        }
      }
    }

    return false;
  }

  virtual void Transform() = 0;

  virtual void LoadConfig(const YAML::Node& load, const std::string& path) = 0;
  virtual void SaveConfig(YAML::Emitter& emitter, const std::string& path) = 0;

  virtual QWidget* GetConfigWidget(QWidget* /* parent */) { return nullptr; }

  virtual void PrintError(const std::string& message) = 0;
  virtual void PrintInfo(const std::string& message) = 0;
  virtual void PrintWarning(const std::string& message) = 0;

  void SetIcon(IconWidget* icon) { icon_ = icon; }

  void PrintMeasurements()
  {
    std::string header = type_ + " (" + name_ + ")";
    meas_transform_.printInfo(node_->get_logger(), header + " Transform()");
    meas_paint_.printInfo(node_->get_logger(), header + " Paint()");
    meas_draw_.printInfo(node_->get_logger(), header + " Draw()");
  }

  void PrintErrorHelper(
    QLabel *status_label,
    const std::string& message,
    double throttle = 0.0);
  void PrintInfoHelper(
    QLabel *status_label,
    const std::string& message,
    double throttle = 0.0);
  void PrintWarningHelper(
    QLabel *status_label,
    const std::string& message,
    double throttle = 0.0);

public Q_SLOTS:
  virtual void DrawIcon() {}

  virtual bool SupportsPainting()
  {
    return false;
  }

Q_SIGNALS:
  void DrawOrderChanged(int draw_order);
  void SizeChanged();
  void TargetFrameChanged(const std::string& target_frame);
  void UseLatestTransformsChanged(bool use_latest_transforms);
  void VisibleChanged(bool visible);


protected:
  bool initialized_;
  bool visible_;

  QGLWidget* canvas_;
  IconWidget* icon_;

  std::shared_ptr<rclcpp::Node> node_;

  std::shared_ptr<tf2_ros::Buffer> tf_buf_;
  std::shared_ptr<tf2_ros::TransformListener> tf_;
  swri_transform_util::TransformManagerPtr tf_manager_;

  std::string target_frame_;
  std::string source_frame_;
  std::string type_;
  std::string name_;

  bool use_latest_transforms_;

  int draw_order_;

  virtual bool Initialize(QGLWidget* canvas) = 0;

  MapvizPlugin() :
    initialized_(false),
    visible_(true),
    canvas_(nullptr),
    icon_(nullptr),
    node_(nullptr),
    tf_(),
    target_frame_(""),
    source_frame_(""),
    use_latest_transforms_(false),
    draw_order_(0)
  {}

  private:
  // Collect basic profiling info to know how much time each plugin
  // spends in Transform(), Paint(), and Draw().
  Stopwatch meas_transform_;
  Stopwatch meas_paint_;
  Stopwatch meas_draw_;
};
typedef std::shared_ptr<MapvizPlugin> MapvizPluginPtr;

// Implementation

inline void MapvizPlugin::PrintErrorHelper(QLabel *status_label, const std::string &message,
                                            double throttle)
{
    if (message == status_label->text().toStdString()) {
      return;
    }

    auto logger = node_ ? node_->get_logger() : rclcpp::get_logger("mapviz");
    if (throttle > 0.0) {
        RCLCPP_ERROR(logger, "Error: %s", message.c_str());
    } else {
        RCLCPP_ERROR(logger, "%s", message.c_str());
    }
    QPalette p(status_label->palette());
    p.setColor(QPalette::Text, Qt::red);
    status_label->setPalette(p);
    status_label->setText(message.c_str());
}

inline void MapvizPlugin::PrintInfoHelper(QLabel *status_label, const std::string &message,
                                          double throttle)
{
    if (message == status_label->text().toStdString()) {
      return;
    }

    auto logger = node_ ? node_->get_logger() : rclcpp::get_logger("mapviz");
    if (throttle > 0.0) {
        RCLCPP_INFO(logger, "%s", message.c_str());
    } else {
        RCLCPP_INFO(logger, "%s", message.c_str());
    }
    QPalette p(status_label->palette());
    p.setColor(QPalette::Text, Qt::darkGreen);
    status_label->setPalette(p);
    status_label->setText(message.c_str());
}

inline void MapvizPlugin::PrintWarningHelper(QLabel *status_label, const std::string &message,
                                              double throttle)
{
    if (message == status_label->text().toStdString()) {
      return;
    }

    auto logger = node_ ? node_->get_logger() : rclcpp::get_logger("mapviz");
    if (throttle > 0.0) {
        RCLCPP_WARN(logger, "%s", message.c_str());
    } else {
        RCLCPP_WARN(logger, "%s", message.c_str());
    }
    QPalette p(status_label->palette());
    p.setColor(QPalette::Text, Qt::darkYellow);
    status_label->setPalette(p);
    status_label->setText(message.c_str());
}

}   // namespace mapviz

#endif  // MAPVIZ__MAPVIZ_PLUGIN_H_