feat(editor): a scenery begun from nothing is asked for its terrain as the first track is laid

With the lay tool on, a scenery with no tracks nor terrain chunks gets the offer of the terrain model and the aerial photos
around the camera; without a place yet it asks for the PUWG 1992 coordinates of this point, as geoportal.gov.pl gives them,
and keeps them as the place of its orthophoto. The offer can be turned off (editor setting terrain_offer). Self-test
nmtoffer.

application/editormode.cpp

@@ -1481,6 +1481,7 @@ bool editor_mode::update()
     render_open_scenery_popup();
     render_shortcuts_window();
     render_first_steps();
+    render_nmt_prompt();
     render_orthophoto_window();
     render_switch_designer();
     render_environment_window();

application/editormode.h

@@ -348,6 +348,10 @@ class editor_mode : public application_mode, private editor_track::observer
 		std::size_t shaped{0};
 		std::string status;
 		std::string error;
+		bool offered{false}; // the terrain was offered to the scenery begun without it
+		bool prompt{false}; // the offer is shown
+		double north{0.0}; // the place typed into the offer, PUWG 1992
+		double east{0.0};
 	};
 	editor_nmt m_nmt;
 	nmt_state m_nmt_state;
@@ -362,6 +366,10 @@ class editor_mode : public application_mode, private editor_track::observer
 	void nmt_shape_tracks();
 	void nmt_update();
 	void render_nmt_ui();
+	// a scenery begun from nothing, with no tracks nor terrain, is asked as the first track is laid whether it wants the terrain
+	void nmt_offer();
+	void render_nmt_prompt();
+	void nmt_accept_offer();
 	// the tool of the terrain the left mouse button works
 	enum class terrain_tool
 	{

application/editormodenmt.cpp

@@ -16,6 +16,8 @@ http://mozilla.org/MPL/2.0/.
 #include "application/editormodeshared.h"
 #include "editor/editorFormat.hpp"
 #include "editor/editorGeometry.hpp"
+#include "editor/editorSettings.hpp"
+#include "utilities/Globals.h"
 #include "simulation/simulation.h"
 #include "utilities/Logs.h"
 #include "utilities/translation.h"
@@ -248,6 +250,7 @@ void editor_mode::nmt_shape_tracks()
 void editor_mode::nmt_update()
 {
 	auto &state{m_nmt_state};
+	nmt_offer();
 	if (state.fitting)
 	{
 		bool all{true};
@@ -335,3 +338,80 @@ void editor_mode::render_nmt_ui()
 		ImGui::TextColored(ImVec4(1.0f, 0.5f, 0.3f, 1.0f), "%s", state.error.c_str());
 	ImGui::TextDisabled("%s", STR_C("Terrain model: GUGiK, geoportal.gov.pl"));
 }
+
+void editor_mode::nmt_offer()
+{
+	auto &state{m_nmt_state};
+	if (state.offered || false == m_lay.active || false == EditorSettings.terrain_offer())
+		return;
+	state.offered = true;
+	if (m_streamer.resident() > 0 || std::any_of(simulation::Paths.sequence().begin(), simulation::Paths.sequence().end(), [](TTrack const *Track) { return Track != nullptr && rail(*Track); }))
+		return;
+	nmt_locate();
+	state.north = m_orthophoto.settings().north;
+	state.east = m_orthophoto.settings().east;
+	state.prompt = true;
+}
+
+void editor_mode::nmt_accept_offer()
+{
+	auto &state{m_nmt_state};
+	if (false == m_nmt.placed())
+	{
+		auto config{m_orthophoto.settings()};
+		config.north = state.north;
+		config.east = state.east;
+		m_orthophoto.settings(config);
+		m_orthophoto_origin_edit = {config.north, config.east};
+		save_orthophoto_settings();
+	}
+	// no tracks to fit to: the heights of the model as they are
+	state.offset = 0.0;
+	nmt_make(nmt_keys_around());
+	state.prompt = false;
+}
+
+void editor_mode::render_nmt_prompt()
+{
+	auto &state{m_nmt_state};
+	if (false == state.prompt)
+		return;
+	char const *const title{STR_C("Terrain for the new scenery###nmtoffer")};
+	if (false == ImGui::IsPopupOpen(title))
+		ImGui::OpenPopup(title);
+	ImGui::SetNextWindowSize(ImVec2(520.0f * Global.ui_scale, 0.0f));
+	if (false == ImGui::BeginPopupModal(title, nullptr, ImGuiWindowFlags_NoResize))
+		return;
+	ImGui::TextWrapped("%s", STR_C("The scenery has no terrain yet. Load the terrain model and the aerial photos around here? The tracks laid then go along the real ground."));
+	bool const placed{m_nmt.placed()};
+	if (false == placed)
+	{
+		ImGui::TextWrapped("%s", STR_C("Where is it? PUWG 1992 of this point, X to the north and Y to the east, as geoportal.gov.pl gives them:"));
+		ImGui::SetNextItemWidth(150.0f);
+		ImGui::InputDouble("X##nmtnorth", &state.north, 0.0, 0.0, "%.0f");
+		ImGui::SameLine();
+		ImGui::SetNextItemWidth(150.0f);
+		ImGui::InputDouble("Y##nmteast", &state.east, 0.0, 0.0, "%.0f");
+	}
+	auto const known{placed || (state.north > 100000.0 && state.east > 100000.0)};
+	ImGui::BeginDisabled(false == known);
+	if (ImGui::Button(STR_C("Load the terrain")))
+	{
+		nmt_accept_offer();
+		ImGui::CloseCurrentPopup();
+	}
+	ImGui::EndDisabled();
+	ImGui::SameLine();
+	if (ImGui::Button(STR_C("Without terrain")))
+	{
+		state.prompt = false;
+		ImGui::CloseCurrentPopup();
+	}
+	bool ask{EditorSettings.terrain_offer()};
+	if (ImGui::Checkbox(STR_C("Ask with every new scenery"), &ask))
+	{
+		EditorSettings.terrain_offer(ask);
+		EditorSettings.save();
+	}
+	ImGui::EndPopup();
+}

application/editormodeselftestterrain.cpp

@@ -82,6 +82,21 @@ editor_mode::selftest_result editor_mode::selftest_terrain(std::string const &co
 		WriteLog("SELFTEST nmtmake " + where + ": " + m_nmt_state.status);
 		return selftest_result::handled;
 	}
+	if (command == "nmtoffer")
+	{
+		// the offer of the terrain to a scenery begun from nothing: logged, and taken with the place given, if any
+		double north{0.0}, east{0.0};
+		words >> north >> east;
+		WriteLog(format("SELFTEST nmtoffer: shown %d", m_nmt_state.prompt ? 1 : 0));
+		if (north > 0.0 && east > 0.0 && m_nmt_state.prompt)
+		{
+			m_nmt_state.north = north;
+			m_nmt_state.east = east;
+			nmt_accept_offer();
+			WriteLog("SELFTEST nmtoffer taken: " + m_nmt_state.status);
+		}
+		return selftest_result::handled;
+	}
 	if (command == "nmtwait")
 	{
 		// till the model is in and the chunks waiting for it are made