feat(editor): a map of Poland to pick a place on, shared by the scenery wizard and the terrain model

editor/editorGeoMap.hpp

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+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include <cstdint>
+#include <future>
+#include <string>
+#include <vector>
+
+#include <glm/glm.hpp>
+
+// the place of a scenery in Poland: PUWG 1992 (EPSG:2180), the metres of the Polish maps, as (east, north)
+namespace editor_geo
+{
+
+glm::dvec2 to_puwg(double const Latitude, double const Longitude);
+// latitude, longitude
+glm::dvec2 to_degrees(glm::dvec2 const &Point);
+// two numbers as a map gives them: degrees (latitude, longitude, as the online maps copy them) or the X and Y of PUWG 1992
+// (north, then east, as geoportal.gov.pl shows them); false when they're neither, or the place isn't in Poland
+bool parse_place(std::string const &Text, glm::dvec2 &Point);
+bool in_poland(glm::dvec2 const &Point);
+
+} // namespace editor_geo
+
+// the map of Poland to pick a place on: the base map of OpenStreetMap from geoportal.gov.pl, the wheel zooms it, a drag moves
+// it, a click picks the place
+class editor_map
+{
+  public:
+	editor_map() = default;
+	~editor_map();
+	editor_map(editor_map const &) = delete;
+	editor_map &operator=(editor_map const &) = delete;
+
+	// at the cursor, Size big; true when a place was clicked
+	bool render(glm::vec2 const &Size);
+	void pick(glm::dvec2 const &Point);
+	// the map goes there, at most Scale m a pixel
+	void show(glm::dvec2 const &Point, double const Scale = 4.0);
+	bool picked() const { return m_picked; }
+	glm::dvec2 const &point() const { return m_point; }
+
+  private:
+	struct image
+	{
+		glm::dvec2 low{0.0};
+		glm::dvec2 high{0.0};
+		int width{0};
+		int height{0};
+		std::vector<std::uint8_t> pixels;
+		std::string error;
+	};
+
+	void request(glm::vec2 const &Size);
+	void upload();
+	void release();
+
+	glm::dvec2 m_centre{515000.0, 460000.0};
+	double m_scale{1000.0}; // m a pixel
+	bool m_fitted{false};
+	double m_changed{0.0};
+	bool m_dirty{true};
+	glm::vec2 m_pressed{0.f};
+	bool m_dragging{false};
+	std::future<image> m_request;
+	std::uint64_t m_texture{0};
+	glm::dvec2 m_image_low{0.0};
+	glm::dvec2 m_image_high{0.0};
+	std::string m_error;
+	bool m_picked{false};
+	glm::dvec2 m_point{0.0};
+};