add progress bar

src/Optional.h

@@ -1,4 +1,5 @@
 #ifndef OPTIONAL_H_
+#define OPTIONAL_H_
 
 namespace utils {
 

src/Progress.h

@@ -0,0 +1,29 @@
+#ifndef PROGRESS_H_
+#define PROGRESS_H_
+
+#include <iostream>
+
+namespace utils {
+
+#define BAR_WIDTH 70
+
+class Progress {
+public:
+  static void of(float p) {
+    std::cout << "[";
+    int pos = BAR_WIDTH * p;
+    for (int i = 0; i < BAR_WIDTH; ++i) {
+      if (i < pos)
+        std::cout << "=";
+      else if (i == pos)
+        std::cout << ">";
+      else
+        std::cout << " ";
+    }
+    std::cout << "] " << int(p * 100.0) << " %\r";
+    std::cout.flush();
+  }
+};
+} // namespace utils
+
+#endif // !PROGRESS_H_

src/RayTracer.cc

@@ -2,6 +2,7 @@
 #include "HitRecord.h"
 #include "Output.h"
 #include "Parser.h"
+#include "Progress.h"
 #include "Ray.h"
 
 #include <Eigen/Core>
@@ -70,7 +71,8 @@ void RayTracer::render() {
     rpp = raysPerPixel.z();
   }
 
-  for (int y = 0; y < height; ++y)
+  for (int y = 0; y < height; ++y) {
+    utils::Progress::of((y + 1.0f) / height);
     for (int x = 0; x < width; ++x)
       for (int j = 0; j < gridHeight; ++j)
         for (int i = 0; i < gridWidth; ++i) {
@@ -88,6 +90,9 @@ void RayTracer::render() {
             calculateColor(hit, y * width + x);
           }
         }
+  }
+
+  std::cout << std::endl;
 }
 
 void RayTracer::run() {