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I was trying to use draw a gradient image(kind of gimp style) using "step". But the result turn out to be wrong. Could anyone give me some hints ?

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
    Mat img;
    Scalar a = 0;
    img = Mat(32, 32, CV_8UC1, a);
    unsigned char *p;
    for(int i=0; i<img.rows; i++)
    {
         p = img.data + i*img.step[0];
         for(int j=0; j<img.cols; j++, p++)
         {
            *p = j;
         }
    }
    imwrite("gradient.png", img);
    return 0;
  }