record touch-event times and show reports.

TouchProfiler.mm

///  start TouchProfiler.h
#ifndef __MySketchPad__TouchProfiler__
#define __MySketchPad__TouchProfiler__

#include <deque>
using namespace std;

class TouchProfiler
{
public:
    TouchProfiler();
    ~TouchProfiler();
    void init();
    void report();
    void addPoint();
    void addEnd();
    int pointCount();
    
private:
    deque<double> points;
    deque<double> avgrates;
};

#endif /* defined(__MySketchPad__TouchProfiler__) */
/// end TouchProfiler

/// start TouchProfiler.mm

#include "TouchProfiler.h"

TouchProfiler::TouchProfiler()
{
    //
}

TouchProfiler::~TouchProfiler()
{
    points.clear();
}

void TouchProfiler::init()
{
    points.clear();
    avgrates.clear();
}

void TouchProfiler::report()
{
    double last = 0;
    double sum = 0;
    double mindiff = 0xfff;
    double maxdiff = 0.0;
    for (int i=0; i<points.size(); ++i) {
        double cur = points[i];
        if (last - 0.0 > 0.0001) {
            double curdiff = cur-last;
            printf(" >>> current diff: %lf\n", curdiff);
            sum += curdiff;
            if (curdiff < mindiff) {
                mindiff = curdiff;
            }
            if (curdiff > maxdiff) {
                maxdiff = curdiff;
            }
        }
        last = cur;
    }
    if (points.size() > 1) {
        double avg = sum/(points.size()-1);
        printf(" >>> sum:%lf, agv:%lf, max:%lf, min:%lf\n", sum, avg, maxdiff, mindiff);
    }
    points.clear();
}

void TouchProfiler::addPoint()
{
    double currentTime = CACurrentMediaTime();
    points.push_back(currentTime);
}

void TouchProfiler::addEnd()
{
    report();
}

int TouchProfiler::pointCount()
{
    return points.size();
}
/// end TouchProfiler.mm