#include "CVGraph.h"

/* Display a very crude graph using openCV.  
   only used for debugging.
   values[n] = vector to graph.
   xSize, ySize = size of window.
   title = title.
*/


void cvGraph(int* values, int n, int xSize, int ySize, const char *title)
{
    char buff[50];
    int x0 = 0, y0 = ySize - 1;
    int ymin, ymax;
    ymin = ymax = values[0];

    Mat g = Mat::zeros(ySize, xSize, CV_8UC1);
    for (int i = 1; i < n; i++) {
        if (values[i] < ymin) ymin = values[i];
        if (values[i] > ymax) ymax = values[i];
    }
    
    // sprintf_s(buff, sizeof(buff), "%s %d - %d", title, ymin, ymax);

    for (int i = 0; i < n; i++) {
        int x = (i * xSize) / n;
        int y = ySize - ((values[i]-ymin) * ySize) / (ymax-ymin+1);
        if (y >= ySize) y = ySize - 1;
        if (y < 0) y = 0;
        cv::line(g, Point(x0, y0), Point(x, y), 255);
        x0 = x;  y0 = y;
    }
    imshow(title, g);
    waitKey(10);                     // Wait for a keystroke in the window
//    destroyWindow(buff);
}