From 79cdfeb4a69eec5e874463ee356846e0b331d853 Mon Sep 17 00:00:00 2001
From: David Vereb <dvereb@dvereb.com>
Date: Wed, 9 Sep 2020 21:40:39 -0400
Subject: [PATCH] Better 3d visualization.

---
 main.cpp | 74 +++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 55 insertions(+), 19 deletions(-)

diff --git a/main.cpp b/main.cpp
index 22e5c49..14a2d5c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -15,6 +15,7 @@ GLfloat light_position[] = {1.0, 1.0, 1.0, 0.0};  /* Infinite light location. */
 struct Point {
 	float lat;
 	float lon;
+	float ele;
 };
 
 static std::vector<std::vector<Point> > tracks;
@@ -26,16 +27,16 @@ static std::vector<std::vector<Point> > tracks;
 
 void draw(const std::vector<Point> &points)
 {
-	static float rot=0.0;
-	rot += 0.1f;
+	glLineWidth(1.0f);
 
-	glLineWidth(0.5f);
-	glColor3d(1.0,1.0,1.0);
-
-	// Draw Sun:
+	// Draw bike path
 	glBegin(GL_LINE_STRIP);
 	for(auto p : points)
-		glVertex3f(p.lat, p.lon, 0.0);
+	{
+		auto val = (50 + (p.ele * 10)) / 180.0;
+		glColor3d(val, val, val);
+		glVertex3f(p.lat, p.ele, p.lon);
+	}
 	glEnd();
 
 	// usleep(100000);
@@ -45,9 +46,22 @@ void draw(const std::vector<Point> &points)
 
 void display()
 {
+	// RESET:
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glLoadIdentity();
+
+	static double asdf = -10.0;
+	asdf += 0.03;
+	if(asdf > 30.0)
+		asdf = -30.0;
+	gluLookAt(-asdf, 12.0, -30,  /* eye is at */
+	          0.0, 0.0, 0.0,  /* center is at */
+	          0.0, 1.0, 0.0);    /* up is in positive Y direction */
+
+	// DRAW TRACKS:
 	for(auto track : tracks)
 		draw(track);
+
 	glutSwapBuffers();
 }
 
@@ -56,6 +70,8 @@ void init()
 	// dvereb:
 	srand(time(NULL));
 
+	glColor3d(1.0, 1.0, 1.0);
+
 	/* Enable a single OpenGL light. */
 	// glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
 	// glLightfv(GL_LIGHT0, GL_POSITION, light_position);
@@ -71,9 +87,9 @@ void init()
 	                /* aspect ratio */ 1.0,
 	                /* Z near */ 1.0, /* Z far */ 1000.0);
 	glMatrixMode(GL_MODELVIEW);
-	gluLookAt(0.0, 0.0, 20.0,  /* eye is at */
+	gluLookAt(-10.0, 25.0, -10.0,  /* eye is at */
 	          0.0, 0.0, 0.0,  /* center is at */
-	          0.0, 1.0, 0.);    /* up is in positive Y direction */
+	          0.0, 1.0, 0.0);    /* up is in positive Y direction */
 }
 
 int main(int argc, char *argv[])
@@ -92,6 +108,8 @@ int main(int argc, char *argv[])
 			files.push_back(entry.path().filename());
 	}
 
+	float file_diff_lat = -8;
+	float file_diff_lon = -8;
 	for(auto file : files)
 	{
 		std::ifstream ifs(file);
@@ -103,30 +121,40 @@ int main(int argc, char *argv[])
 
 		std::string line = "";
 		bool first = true;
-		float diff_lat, diff_lon;
+		float diff_lat, diff_lon, diff_ele;
 		std::vector<Point> track;
 		while(std::getline(ifs, line))
 		{
-			// get starting position of field NAMES
+			// get starting position of field NAME
 			auto lat = line.find("lat=\"");
 			if(lat == std::string::npos)
 				continue;
-			auto lon = line.find("lon=\"");
-			if(lon == 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()) * 500;
-				p.lon = std::atof(line.substr(lon + 5, lon_to).c_str()) * 500;
+				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;
@@ -137,13 +165,21 @@ int main(int argc, char *argv[])
 				first = false;
 				diff_lat = p.lat;
 				diff_lon = p.lon;
+				diff_ele = p.ele;
 			}
 
-			p.lat -= diff_lat;
-			p.lon -= diff_lon;
+			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();
 	}