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// --------------------------------------------------------------------
// Create a C++ plotting "widget" around the gd-1.2 library by Thomas Boutell
//
// This example primarily illustrates how callback functions can be
// implemented in Python.
// --------------------------------------------------------------------
#include <stdio.h>
extern "C" {
#include "gd.h"
}
typedef double (*PLOTFUNC)(double, void *);
class PlotWidget {
private:
double xmin,ymin,xmax,ymax; // Plotting range
PLOTFUNC callback; // Callback function
void *clientdata; // Client data for callback
int npoints; // Number of points to plot
int width; // Image width
int height; // Image height
int black,white;
gdImagePtr im;
void transform(double,double,int&,int&);
public:
PlotWidget(int w, int h,double,double,double,double);
~PlotWidget();
void set_method(PLOTFUNC func, void *clientdata);
void set_range(double,double,double,double);
void set_points(int np) {npoints = np;}
void plot();
void save(FILE *f);
};
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