Implement printing POIs

closes #98

CMakeLists.txt

@@ -175,6 +175,7 @@ add_executable(minetestmapper
 	BlockDecoder.cpp
 	PixelAttributes.cpp
 	PlayerAttributes.cpp
+	POIAttributes.cpp
 	TileGenerator.cpp
 	ZlibDecompressor.cpp
 	ZstdDecompressor.cpp

Image.cpp

@@ -87,7 +87,8 @@ void Image::drawLine(int x1, int y1, int x2, int y2, const Color &c)
 void Image::drawText(int x, int y, const std::string &s, const Color &c)
 {
 	SIZECHECK(x, y);
-	gdImageString(m_image, gdFontGetMediumBold(), x, y, (unsigned char*) s.c_str(), color2int(c));
+	int brect[8];
+	gdImageStringFT(m_image, &brect[0], color2int(c), "dejavu/DejaVuSans-Bold;freefont/FreeSansBold;msttcorefonts/Arial", 13., 0., x, y, s.c_str());
 }
 
 void Image::drawFilledRect(int x, int y, int w, int h, const Color &c)

POIAttributes.cpp

@@ -0,0 +1,87 @@
+#include <cstdio>
+#include <fstream>
+#include <sstream>
+#include <stdexcept>
+#include <dirent.h>
+#include <unistd.h> // for usleep
+#include <sqlite3.h>
+
+#include "config.h"
+#include "POIAttributes.h"
+#include "util.h"
+
+POIAttributes::POIAttributes(const std::string &worldDir)
+{
+	std::ifstream ifs(worldDir + "world.mt");
+	if (!ifs.good())
+		throw std::runtime_error("Failed to read world.mt");
+	std::string backend = read_setting_default("mod_storage_backend", ifs, "sqlite3");
+	ifs.close();
+
+	if (backend == "sqlite3")
+		readSqlite(worldDir + "mod_storage.sqlite");
+	else
+		throw std::runtime_error(std::string("Unknown poi backend: ") + backend);
+}
+
+/**********/
+
+#define SQLRES(f, good) \
+	result = (sqlite3_##f); \
+	if (result != good) { \
+		throw std::runtime_error(sqlite3_errmsg(db));\
+	}
+#define SQLOK(f) SQLRES(f, SQLITE_OK)
+
+void POIAttributes::readSqlite(const std::string &db_name)
+{
+	int result;
+	sqlite3 *db;
+	sqlite3_stmt *stmt_get_poi_pos;
+
+	SQLOK(open_v2(db_name.c_str(), &db, SQLITE_OPEN_READONLY |
+			SQLITE_OPEN_PRIVATECACHE, 0))
+
+	SQLOK(prepare_v2(db,
+			"SELECT key, value FROM entries WHERE modname = 'poi'",
+		-1, &stmt_get_poi_pos, NULL))
+
+	while ((result = sqlite3_step(stmt_get_poi_pos)) != SQLITE_DONE) {
+		if (result == SQLITE_BUSY) { // Wait some time and try again
+			usleep(10000);
+		} else if (result != SQLITE_ROW) {
+			throw std::runtime_error(sqlite3_errmsg(db));
+		}
+
+		POI poi;
+		const unsigned char *name_ = sqlite3_column_text(stmt_get_poi_pos, 0);
+		poi.name = reinterpret_cast<const char*>(name_);
+		const char *pos_ = reinterpret_cast<const char*>(sqlite3_column_text(stmt_get_poi_pos, 1));
+		float x, y, z;
+		int items = sscanf(pos_, "(%f,%f,%f)", &x, &y, &z);
+		if (items != 3) {
+		   std::cerr << "Failed to parse POI position '" << pos_ << "'" << std::endl;
+		   return;
+		}
+		poi.x = x;
+		poi.y = y;
+		poi.z = z;
+
+		m_pois.push_back(poi);
+	}
+
+	sqlite3_finalize(stmt_get_poi_pos);
+	sqlite3_close(db);
+}
+
+/**********/
+
+POIAttributes::POIs::const_iterator POIAttributes::begin() const
+{
+	return m_pois.cbegin();
+}
+
+POIAttributes::POIs::const_iterator POIAttributes::end() const
+{
+	return m_pois.cend();
+}

TileGenerator.cpp

@@ -14,6 +14,7 @@
 #include "TileGenerator.h"
 #include "config.h"
 #include "PlayerAttributes.h"
+#include "POIAttributes.h"
 #include "BlockDecoder.h"
 #include "Image.h"
 #include "util.h"
@@ -118,6 +119,7 @@ TileGenerator::TileGenerator():
 	m_scaleColor(0, 0, 0),
 	m_originColor(255, 0, 0),
 	m_playerColor(255, 0, 0),
+	m_poiColor(0, 128, 255),
 	m_drawOrigin(false),
 	m_drawPlayers(false),
 	m_drawScale(false),
@@ -195,6 +197,11 @@ void TileGenerator::setDrawPlayers(bool drawPlayers)
 	m_drawPlayers = drawPlayers;
 }
 
+void TileGenerator::setDrawPOIs(bool drawPOIs)
+{
+   m_drawPOIs = drawPOIs;
+}
+
 void TileGenerator::setDrawScale(bool drawScale)
 {
 	m_drawScale = drawScale;
@@ -314,6 +321,9 @@ void TileGenerator::generate(const std::string &input_path, const std::string &o
 	if (m_drawPlayers) {
 		renderPlayers(input_path);
 	}
+	if (m_drawPOIs) {
+	   renderPOIs(input_path);
+	}
 	writeImage(output);
 	printUnknown();
 }
@@ -848,6 +858,27 @@ void TileGenerator::renderPlayers(const std::string &input_path)
 	}
 }
 
+void TileGenerator::renderPOIs(const std::string &input_path)
+{
+	std::string input = input_path;
+	if (input.back() != PATH_SEPARATOR)
+		input += PATH_SEPARATOR;
+
+	POIAttributes pois(input);
+	for (auto &poi : pois) {
+	   if (poi.x < m_xMin * 16 || poi.x > m_xMax * 16 ||
+		 poi.z < m_zMin * 16 || poi.z > m_zMax * 16)
+	      continue;
+	   if (poi.y < m_yMin || poi.y > m_yMax)
+	      continue;
+	   int imageX = getImageX(poi.x, true),
+	       imageY = getImageY(poi.z, true);
+
+	   m_image->drawCircle(imageX, imageY, 9, m_poiColor);
+	   m_image->drawText(imageX + 7, imageY, poi.name, m_poiColor);
+	}
+}
+
 void TileGenerator::writeImage(const std::string &output)
 {
 	m_image->save(output);

include/POIAttributes.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <list>
+#include <string>
+
+struct POI
+{
+	std::string name;
+	float x, y, z;
+};
+
+class POIAttributes
+{
+public:
+	typedef std::list<POI> POIs;
+
+	POIAttributes(const std::string &worldDir);
+	POIs::const_iterator begin() const;
+	POIs::const_iterator end() const;
+
+private:
+	void readFiles(const std::string &poisPath);
+	void readSqlite(const std::string &db_name);
+
+	POIs m_pois;
+};

include/TileGenerator.h

@@ -79,6 +79,7 @@ public:
 	void setDrawPlayers(bool drawPlayers);
 	void setDrawScale(bool drawScale);
 	void setDrawAlpha(bool drawAlpha);
+	void setDrawPOIs(bool drawPOIs);
 	void setShading(bool shading);
 	void setGeometry(int x, int y, int w, int h);
 	void setMinY(int y);
@@ -109,6 +110,7 @@ private:
 	void renderScale();
 	void renderOrigin();
 	void renderPlayers(const std::string &inputPath);
+	void renderPOIs(const std::string &inputPath);
 	void writeImage(const std::string &output);
 	void printUnknown();
 	void reportProgress(size_t count);
@@ -121,10 +123,12 @@ private:
 	Color m_scaleColor;
 	Color m_originColor;
 	Color m_playerColor;
+	Color m_poiColor;
 	bool m_drawOrigin;
 	bool m_drawPlayers;
 	bool m_drawScale;
 	bool m_drawAlpha;
+	bool m_drawPOIs;
 	bool m_shading;
 	bool m_dontWriteEmpty;
 	std::string m_backend;

mapper.cpp

@@ -24,6 +24,7 @@ static void usage()
 		{"--drawplayers", ""},
 		{"--draworigin", ""},
 		{"--drawalpha", ""},
+		{"--drawpois", ""},
 		{"--noshading", ""},
 		{"--noemptyimage", ""},
 		{"--min-y", "<y>"},
@@ -108,6 +109,7 @@ int main(int argc, char *argv[])
 		{"drawplayers", no_argument, 0, 'P'},
 		{"drawscale", no_argument, 0, 'S'},
 		{"drawalpha", no_argument, 0, 'e'},
+		{"drawpois", no_argument, 0, 'I'},
 		{"noshading", no_argument, 0, 'H'},
 		{"backend", required_argument, 0, 'd'},
 		{"geometry", required_argument, 0, 'g'},
@@ -170,6 +172,9 @@ int main(int argc, char *argv[])
 			case 'e':
 				generator.setDrawAlpha(true);
 				break;
+			case 'I':
+				generator.setDrawPOIs(true);
+				break;
 			case 'E':
 				onlyPrintExtent = true;
 				break;

minetestmapper.6

@@ -52,6 +52,10 @@ Draw origin indicator
 .BR \-\-drawalpha
 Allow nodes to be drawn with transparency
 
+.TP
+.BR \-\-drawpois
+Draw POIs
+
 .TP
 .BR \-\-noshading
 Don't draw shading on nodes