WIP: getting position of star from stars.speck

modules/exoplanets/exoplanetsmodule.cpp

@@ -32,10 +32,96 @@
 
 #include <ghoul/misc/assert.h>
 
+#include <fstream>
+
 namespace openspace {
 
 ExoplanetsModule::ExoplanetsModule() : OpenSpaceModule(Name) {}
 
+std::vector<float> readSpeckFile(std::string starname) {
+    std::ifstream file("C:/Users/Karin/Documents/OpenSpace/modules/exoplanets/stars.speck");
+	  if (!file.good()) {
+		    std::cout << "Failed to open Speck file '{}'";
+	  }
+
+	   int _nValuesPerStar = 0;
+
+  	// The beginning of the speck file has a header that either contains comments
+  	// (signaled by a preceding '#') or information about the structure of the file
+  	// (signaled by the keywords 'datavar', 'texturevar', and 'texture')
+	   std::string line = "";
+	   while (true) {
+		 std::streampos position = file.tellg();
+		 std::getline(file, line);
+
+     if (line[0] == '#' || line.empty()) {
+       continue;
+		 }
+
+		if (line.substr(0, 7) != "datavar" &&
+			line.substr(0, 10) != "texturevar" &&
+			line.substr(0, 7) != "texture")
+		{
+			// we read a line that doesn't belong to the header, so we have to jump back
+			// before the beginning of the current line
+			file.seekg(position);
+			break;
+		}
+
+		if (line.substr(0, 7) == "datavar") {
+			// datavar lines are structured as follows:
+			// datavar # description
+			// where # is the index of the data variable; so if we repeatedly overwrite
+			// the 'nValues' variable with the latest index, we will end up with the total
+			// number of values (+3 since X Y Z are not counted in the Speck file index)
+			std::stringstream str(line);
+
+			std::string dummy;
+			str >> dummy;
+			str >> _nValuesPerStar;
+			_nValuesPerStar += 1; // We want the number, but the index is 0 based
+		}
+	}
+
+	_nValuesPerStar += 3; // X Y Z are not counted in the Speck file indices
+
+	do {
+		std::vector<float> values(_nValuesPerStar);
+
+		std::getline(file, line);
+		std::stringstream str(line);
+
+		for (int i = 0; i < _nValuesPerStar; ++i) {
+			str >> values[i];
+		}
+
+		std::string next;
+		std::getline(str, next);
+		std::stringstream namestr(next);
+
+		// 1. ignore first #
+		// 2. push all names in the rest of the stream to a array
+		std::string value;
+		std::vector<std::string> names;
+
+		while (namestr >> value) {
+			if (value == "#" || value == "|")
+				continue;
+			else {
+				names.push_back(value);
+			}
+		}
+
+		for (size_t i = 0; i < names.size(); ++i) {
+			if (!names[i].empty() && names[i].compare(starname) == 0) {
+				return values;
+			}
+		}
+
+	} while (!file.eof());
+
+}
+
 int addNode(lua_State* L) {
 
     // get name of star and add a node at the position of the star.
@@ -47,15 +133,17 @@ int addNode(lua_State* L) {
     const int StringLocation = -1; //first argument
     const std::string starname = luaL_checkstring(L, StringLocation);
 
-    //printf(starname.c_str());
+    std::vector<float> values = readSpeckFile(starname);
+    printf(std::to_string(values[0]).c_str());
 
     // adding the parent node of the exoplanet system
-    const std::string luaTableParent = "{ Name = '" + starname +"', Parent = 'SolarSystemBarycenter', Transform = { Translation = { Type = 'StaticTranslation', Position = {4662120063743.592773, 1263245003503.724854, -955413856565.788086} } }}"; // positionen must be gathered from star.speck
+    //const std::string luaTableParent = "{ Name = '" + starname +"', Parent = 'SolarSystemBarycenter', Transform = { Translation = { Type = 'StaticTranslation', Position = {" + std::to_string(values[0]) + ", " + std::to_string(values[1]) + ", " + std::to_string(values[2]) + "} } }}"; // positionen must be gathered from star.speck
+    const std::string luaTableParent = "{ Name = '" + starname + "', Parent = 'SolarSystemBarycenter', Transform = { Translation = { Type = 'StaticTranslation', Position = { -6.5825, -1.6713, 25.2259} } }}";
     const std::string scriptParent = "openspace.addSceneGraphNode("+ luaTableParent +");";
     OsEng.scriptEngine().queueScript(
        scriptParent,
        openspace::scripting::ScriptEngine::RemoteScripting::Yes
-    ); 
+    );
 
     // adding a renderable in the place of the stars
     const std::string luaTableStarGlare = "{ Name = '" + starname + "Plane', Parent = '" + starname +"', Renderable = { Type = 'RenderablePlaneImageLocal', Size = 1.3*10^10.5, Billboard = true, Texture = 'C:/Users/Karin/Documents/OpenSpace/modules/exoplanets/glare.png', BlendMode = 'Additive' }  }";
@@ -65,7 +153,6 @@ int addNode(lua_State* L) {
        openspace::scripting::ScriptEngine::RemoteScripting::Yes
     );
 
-
 }
 
 scripting::LuaLibrary ExoplanetsModule::luaLibrary() const {
@@ -78,7 +165,7 @@ scripting::LuaLibrary ExoplanetsModule::luaLibrary() const {
             &addNode,
             {},
             "string",
-            "Adds print message."
+            "Adds two nodes to the scenegraph, one position node and one node to represenet the star."
         }
 
     };