rulerstrategies.hh

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#pragma once
 
#include <memory>
 
#include <gtk/gtk.h>
 
#include <scroom/interface.hh>
 
class RulerDrawStrategy : private Interface
{
public:
  using Ptr = std::shared_ptr<RulerDrawStrategy>;
 
  virtual double getMajorTickLength(double percentage) = 0;
 
  virtual double getDrawAreaSize() = 0;
 
 
  virtual void drawOutline(cairo_t* cr, double lineWidth) = 0;
 
  virtual void drawTickLine(cairo_t* cr, double linePosition, double lineWidth, double lineLength) = 0;
 
  virtual void drawTickText(
    cairo_t* cr,
    const std::string& label,
    double linePosition,
    double labelOffset,
    double labelAlign,
    double lineLength
  ) = 0;
 
  void setAllocatedSize(int newWidth, int height);
 
  [[nodiscard]] int getWidth() const;
 
  [[nodiscard]] int getHeight() const;
 
protected:
  static constexpr double LINE_COORD_OFFSET{0.5};
  static constexpr double TEXT_ANCHOR{0.5};
 
private:
  int width{};
  int height{};
};
 
class HorizontalDrawStrategy : public RulerDrawStrategy
{
public:
  static RulerDrawStrategy::Ptr create();
 
  double getMajorTickLength(double percentage) override;
  double getDrawAreaSize() override;
 
  void drawOutline(cairo_t* cr, double lineWidth) override;
  void drawTickLine(cairo_t* cr, double linePosition, double lineWidth, double lineLength) override;
  void drawTickText(
    cairo_t* cr,
    const std::string& label,
    double linePosition,
    double labelOffset,
    double labelAlign,
    double lineLength
  ) override;
};
 
class VerticalDrawStrategy : public RulerDrawStrategy
{
public:
  static RulerDrawStrategy::Ptr create();
 
  double getMajorTickLength(double percentage) override;
  double getDrawAreaSize() override;
 
  void drawOutline(cairo_t* cr, double lineWidth) override;
  void drawTickLine(cairo_t* cr, double linePosition, double lineWidth, double lineLength) override;
  void drawTickText(
    cairo_t* cr,
    const std::string& label,
    double linePosition,
    double labelOffset,
    double labelAlign,
    double lineLength
  ) override;
};