moved from ray3 to floorplan/3D

worked on new wall models
refactoring

floorplan/3D/objects/MTLReader.h

@@ -0,0 +1,130 @@
+#ifndef MTLREADER_H
+#define MTLREADER_H
+
+#include <vector>
+#include <unordered_map>
+#include <string>
+#include <fstream>
+#include "../../../geo/Point2.h"
+#include "../../../geo/Point3.h"
+
+/**
+ * prase .mtl files
+ */
+class MTLReader {
+
+public:
+
+	struct Material {
+		std::string textureFile = "";
+		Point3 diffuse = Point3(1,1,1);
+		float alpha = 1.0;
+	};
+
+	Material* cur = nullptr;
+	std::unordered_map<std::string, Material> map;
+
+	/** ctor. use readXYZ() */
+	MTLReader() {
+		;
+	}
+
+	/** read .obj from the given file */
+	void readFile(const std::string& file) {
+		std::ifstream is(file);
+		std::string line;
+		while(getline(is, line)) {parseLine(line);}
+		is.close();
+	}
+
+	/** read obj from the given data string (.obj file contents) */
+	void readData(const std::string& data) {
+		std::stringstream is(data);
+		std::string line;
+		while(getline(is, line)) {parseLine(line);}
+	}
+
+	/** get the given material */
+	const Material& getMaterial(const std::string& mat) const {
+		const auto& it = map.find(mat);
+		if (it == map.end()) {throw Exception("material not available");}
+		return it->second;
+	}
+
+
+private:
+
+	template<typename Out>
+	void split(const std::string &s, char delim, Out result) {
+		std::stringstream ss(s);
+		std::string item;
+		while (std::getline(ss, item, delim)) {
+			*(result++) = item;
+		}
+	}
+
+	void replaceAll(std::string& str, const std::string& from, const std::string& to) {
+		size_t start_pos = 0;
+		while((start_pos = str.find(from, start_pos)) != std::string::npos) {
+			size_t end_pos = start_pos + from.length();
+			str.replace(start_pos, end_pos, to);
+			start_pos += to.length(); // In case 'to' contains 'from', like replacing 'x' with 'yx'
+		}
+	}
+
+	/** remove empty strings from the vector */
+	std::vector<std::string> nonEmpty(const std::vector<std::string>& src) {
+		std::vector<std::string> res;
+		for (const std::string& s : src) {
+			if (!s.empty()) {res.push_back(s);}
+		}
+		return res;
+	}
+
+	std::vector<std::string> split(const std::string &s, char delim) {
+		std::vector<std::string> elems;
+		split(s, delim, std::back_inserter(elems));
+		return elems;
+	}
+
+	/** parse one line of the .obj file */
+	void parseLine(std::string line) {
+
+		if (line.length() < 2) {return;}
+
+		// remove leading "#"
+		while (line[0] == ' ' || line[0] == '\t') {
+			line.erase(line.begin());
+		}
+
+		// remove other linebreaks
+		replaceAll(line, "\r", "");
+
+		const std::vector<std::string> tokens = nonEmpty(split(line, ' '));
+		const std::string token = tokens.front();
+
+		if ("newmtl" == token) {
+			const std::string id = tokens[1];
+			map[id] = Material();
+			cur = &map[id];
+		} else if ("map_Ka" == token) {
+			const std::string texFile = tokens[1];
+			cur->textureFile = texFile;
+		} else if ("map_Kd" == token) {
+			const std::string texFile = tokens[1];
+			cur->textureFile = texFile;
+		} else if ("Kd" == token) {
+			cur->diffuse.x = std::stof(tokens[1]);
+			cur->diffuse.y = std::stof(tokens[2]);
+			cur->diffuse.z = std::stof(tokens[3]);
+		} else if ("d" == token) {
+			cur->alpha = std::stof(tokens[1]);
+		}
+
+	}
+
+
+
+};
+
+#endif // MTLREADER_H