implement zooming

mandelbrot.cpp

@@ -44,9 +44,8 @@ void Mandelbrotc::start_threads(bool first)
     for (int i = 0; i < this->thread_count; i++) {
         std::thread t = std::thread(&Mandelbrotc::calc, this, i);
         this->threads.push_back(std::move(t));
-        std::cout << "thread created" << std::endl;
+        //std::cout << "thread created" << std::endl;
     }
-
     this->done = false;
 }
 
@@ -71,7 +70,7 @@ void Mandelbrotc::calc(const uint8_t tid)
         }
     }
 
-    std::cout << "thread " << tid << " done" << std::endl;
+    //std::cout << "thread " << tid << " done" << std::endl;
     if (tid == thread_count-1)
         this->done = true;
 }