From a5175799ba9542508ebcd498042de994d0281f38 Mon Sep 17 00:00:00 2001
From: David Vereb <dvereb@dvereb.com>
Date: Sat, 13 Mar 2021 18:55:00 -0500
Subject: [PATCH] t

---
 main.cpp | 137 +++++++++++++++++++++++++++----------------------------
 1 file changed, 66 insertions(+), 71 deletions(-)

diff --git a/main.cpp b/main.cpp
index 6ae7c06..f36998c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,3 +1,5 @@
+#include "rapidxml.hpp"
+
 #include <GL/glut.h>
 
 #include <experimental/filesystem>
@@ -20,6 +22,65 @@ struct Point {
 
 static std::vector<std::vector<Point> > tracks;
 
+bool ParseFile(std::vector<std::vector<Point>> &out_tracks,
+               const std::string &file_and_path)
+{
+	std::ifstream ifs(file_and_path);
+	if(!ifs.is_open())
+	{
+		std::cerr << "Couldn't open " << file_and_path << "." << std::endl;
+		return -2;
+	}
+
+	std::string line = "";
+	bool first = true;
+	float diff_lat, diff_lon, diff_ele;
+	std::vector<Point> track;
+	while(std::getline(ifs, line))
+	{
+		// get starting position of field NAME
+		auto lat = line.find("lat=\"");
+		if(lat == std::string::npos)
+			continue;
+		// get ending position of field DATA
+		auto lat_to = line.find("\"", lat);
+		if(lat_to == std::string::npos)
+			continue;
+
+		// get starting position of field NAME
+		auto lon = line.find("lon=\"", lat_to);
+		if(lon == std::string::npos)
+			continue;
+		// get ending position of field DATA
+		auto lon_to = line.find("\"", lon);
+		if(lon_to == std::string::npos)
+			continue;
+
+		auto ele = line.find("<ele>", lon_to);
+		if(ele == std::string::npos)
+			continue;
+		auto ele_to = line.find("</ele>", ele);
+		if(ele_to == std::string::npos)
+			continue;
+
+		Point p;
+		try {
+			p.lat = std::atof(line.substr(lat + 5, lat_to).c_str()) * 200;
+			p.lon = std::atof(line.substr(lon + 5, lon_to).c_str()) * 200;
+			p.ele = std::atof(line.substr(ele + 5, ele_to).c_str()) * 0.1;
+		} catch (const std::exception &e) {
+			std::cerr << "Error in file " << file_and_path
+			          << ", line \"" << line << "\"."
+			          << std::endl;
+			continue;
+		}
+
+		track.push_back(p);
+	}
+	out_tracks.push_back(track);
+	ifs.close();
+}
+
 // TODO(dev):
 //  As per https://www.opengl.org/resources/libraries/glut/spec3/node11.html
 //  "Therefore, GLUT programs should not assume the window was created at the specified size or position.
@@ -135,80 +196,14 @@ int main(int argc, char *argv[])
 			files.push_back(entry.path().string());
 	}
 
-	float file_diff_lat = -8;
-	float file_diff_lon = -8;
 	for(auto file : files)
 	{
-		std::ifstream ifs(file);
-		if(!ifs.is_open())
-		{
-			std::cerr << "Couldn't open " << file << "." << std::endl;
-			return -2;
-		}
+		// NOTE(dev): OLD:
+		if(!ParseFile(tracks, file))
+			return -3; // couldn't parse file
 
-		std::string line = "";
-		bool first = true;
-		float diff_lat, diff_lon, diff_ele;
-		std::vector<Point> track;
-		while(std::getline(ifs, line))
-		{
-			// get starting position of field NAME
-			auto lat = line.find("lat=\"");
-			if(lat == std::string::npos)
-				continue;
-			// get ending position of field DATA
-			auto lat_to = line.find("\"", lat);
-			if(lat_to == std::string::npos)
-				continue;
-
-			// get starting position of field NAME
-			auto lon = line.find("lon=\"", lat_to);
-			if(lon == std::string::npos)
-				continue;
-			// get ending position of field DATA
-			auto lon_to = line.find("\"", lon);
-			if(lon_to == std::string::npos)
-				continue;
-
-			auto ele = line.find("<ele>", lon_to);
-			if(ele == std::string::npos)
-				continue;
-			auto ele_to = line.find("</ele>", ele);
-			if(ele_to == std::string::npos)
-				continue;
-
-			Point p;
-			try {
-				p.lat = std::atof(line.substr(lat + 5, lat_to).c_str()) * 200;
-				p.lon = std::atof(line.substr(lon + 5, lon_to).c_str()) * 200;
-				p.ele = std::atof(line.substr(ele + 5, ele_to).c_str()) * 0.1;
-			} catch (const std::exception &e) {
-				std::cerr << "Error in file " << file << ", line \"" << line << "\"." << std::endl;
-				continue;
-			}
-
-			if(first)
-			{
-				first = false;
-				diff_lat = p.lat;
-				diff_lon = p.lon;
-				diff_ele = p.ele;
-			}
-
-			p.lat -= diff_lat + file_diff_lat;
-			p.lon -= diff_lon + file_diff_lon;
-			p.ele -= diff_ele;
-			track.push_back(p);
-		}
-		tracks.push_back(track);
-		file_diff_lat += 4;
-		if(file_diff_lat > 5)
-		{
-			file_diff_lat = -8;
-			file_diff_lon += 4;
-		}
-
-		ifs.close();
+		// NOTE(dev): NEW:
+		// TODO(dev): Xml Parser
 	}
 
 	glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH | GLUT_ALPHA | GLUT_MULTISAMPLE);