added second part of evaluation in cpp

gnuplot-iostream/legacy/examples-interactive.cc

@@ -0,0 +1,84 @@
+/*
+Copyright (c) 2013 Daniel Stahlke
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include <vector>
+#include <math.h>
+
+#define GNUPLOT_ENABLE_PTY
+#include "gnuplot-iostream.h"
+
+// Yes, I'm including a *.cc file.  It contains main().
+#include "examples-framework.cc"
+
+void demo_basic() {
+	Gnuplot gp;
+
+	double mx=0, my=0;
+	int mb=1;
+	while(mb != 3 && mb >= 0) {
+		std::vector<std::pair<double, double> > xy_pts;
+		xy_pts.push_back(std::make_pair(mx, my));
+		for(double alpha=0; alpha<1; alpha+=1.0/24.0) {
+			double theta = alpha*2.0*3.14159;
+			xy_pts.push_back(std::make_pair(
+				mx+cos(theta), my+sin(theta)));
+		}
+
+		gp << "set xrange [-2:2]\nset yrange [-2:2]\n";
+		gp << "plot '-' with points title 'circle'\n";
+		gp.send(xy_pts);
+
+		gp.getMouse(mx, my, mb, "Left click to move circle, right click to exit.");
+		printf("You pressed mouse button %d at x=%f y=%f\n", mb, mx, my);
+		if(mb < 0) printf("The gnuplot window was closed.\n");
+	}
+}
+
+void demo_vectors() {
+	Gnuplot gp;
+
+	double mx=0, my=0;
+	int mb=1;
+	while(mb != 3 && mb >= 0) {
+		std::vector<std::vector<float> > vecs(4);
+		for(double alpha=0; alpha<1; alpha+=1.0/24.0) {
+			double theta = alpha*2.0*3.14159;
+			vecs[0].push_back(mx+cos(theta));
+			vecs[1].push_back(my+sin(theta));
+			vecs[2].push_back(-cos(theta)*0.1);
+			vecs[3].push_back(-sin(theta)*0.1);
+		}
+
+		gp << "set xrange [-2:2]\nset yrange [-2:2]\n";
+		gp << "plot '-' with vectors title 'circle'\n";
+		gp.send(vecs);
+
+		gp.getMouse(mx, my, mb, "Left click to move circle, right click to exit.");
+		printf("You pressed mouse button %d at x=%f y=%f\n", mb, mx, my);
+		if(mb < 0) printf("The gnuplot window was closed.\n");
+	}
+}
+
+void register_demos() {
+	register_demo("basic",                  demo_basic);
+	register_demo("vectors",                demo_vectors);
+}