Reduced example for dynamic plot class.

Removed timing and comparison code paths from the
example for the dynamic plot class, to make it easier
to spot the essential usage to the casual reader.

examples/update.cpp

@@ -20,93 +20,41 @@ void update_window(const double x, const double y, const double t,
 
 int main()
 {
-
-    bool use_dynamic_plot = false;
-    bool timeit = true;
-
     size_t n = 1000;
     std::vector<double> x, y;
 
     const double w = 0.05;
     const double a = n/2;
 
-    for(size_t i=0; i<n; i++) {
+    for (size_t i=0; i<n; i++) {
         x.push_back(i);
         y.push_back(a*sin(w*i));
     }
 
     std::vector<double> xt(2), yt(2);
 
-    plt::title("Sample figure");
-
-    std::chrono::time_point<std::chrono::system_clock> start, end;
-    start = std::chrono::system_clock::now();
-
-    if(use_dynamic_plot)
-    {
-        plt::xlim(x.front(), x.back());
-        plt::ylim(-a,a);
-        plt::axis("equal");
-
-        // plot sin once and for all
-        plt::named_plot("sin", x, y);
-
-        // prepare plotting the tangent
-        plt::Plot plot("tangent");
-
-        plt::legend();
-
-        for(size_t i=0; i<n; i++) {
+    plt::title("Tangent of a since curve");
+    plt::xlim(x.front(), x.back());
+    plt::ylim(-a, a);
+    plt::axis("equal");
 
-            if (i % 10 == 0) {
-                {
-                    update_window(x[i], y[i], a*w*cos(w*x[i]), xt, yt);
-                    // just update data for this plot
-                    plot.update(xt, yt);
-                }
+    // Plot sin once and for all.
+    plt::named_plot("sin", x, y);
 
-                // Display plot continuously
-                if(!timeit)
-                    plt::pause(0.1);
-            }
-        }
-    }
-
-    else
-    {
-        for(size_t i=0; i<n; i++) {
-
-            if (i % 10 == 0) {
-                {
-                    plt::clf();
+    // Prepare plotting the tangent.
+    plt::Plot plot("tangent");
 
-                    plt::named_plot("sin", x, y);
+    plt::legend();
 
-                    update_window(x[i], y[i], a*w*cos(w*i), xt, yt);
-                    plt::named_plot("tangent", xt, yt);
+    for (size_t i=0; i<n; i++) {
+        if (i % 10 == 0) {
+            update_window(x[i], y[i], a*w*cos(w*x[i]), xt, yt);
 
-                    // we have to control axis size
-                    plt::xlim(x.front(), x.back());
-                    plt::ylim(-a,a);
-                    plt::axis("equal");
-                    plt::legend();
+            // Just update data for this plot.
+            plot.update(xt, yt);
 
-                }
-
-                // Display plot continuously
-                if(!timeit)
-                    plt::pause(0.1);
-            }
+            // Small pause so the viewer has a chance to enjoy the animation.
+            plt::pause(0.1);
         }
-    }
-
-    end = std::chrono::system_clock::now();
-    double elapsed_seconds = std::chrono::duration_cast<std::chrono::microseconds>
-            (end-start).count();
-    if(use_dynamic_plot)
-        std::cout << "dynamic";
-    else
-        std::cout << "static";
-
-    std::cout << " : " << elapsed_seconds/1000 << " ms\n";
+   }
 }