/* The source code for generating the above plot */ /* File: legend.cpp Plot multiple sets of data in arrays using member function of plotting class CPlot */ #include <math.h> #include <chplot.h> #define N 37 /* number of points for the plot */ int main() { int i, num=0; double x[N], y[N], y2[N]; /* arrays with data for plotting */ class CPlot plot; /* instantiate a plotting class */ /* fill arrays with plotting data */ for(i=0; i<N; i++) { x[i]= 0 + i*360.0/(N-1); // lindata(0, 360, x) y[i] = sin(x[i]*M_PI/180); // Y-axis data y2[i] = cos(x[i]*M_PI/180); // Y-axis data } /* set title, and x and y labels */ plot.title("function sin(x) and cos()"); plot.label(PLOT_AXIS_X, "x (degree)"); plot.label(PLOT_AXIS_Y, " sin(x) and cos(x)"); /* add the 1st set of data for plotting */ plot.data2DCurve(x, y, N); /* add the legend for the 1st set of data */ plot.legend("sin(x)", num++); /* add the 2nd set of data for plotting */ plot.data2DCurve(x, y2, N); /* add the legend for the 2nd set of data */ plot.legend("cos(x)", num); /* plot it */ /* output of the plot as a png file, instead of displaying on screen by default */ plot.outputType(PLOT_OUTPUTTYPE_FILE, "png", "legend.png"); plot.plotting(); return 0; }