在C ++ Qt中将2D向量/ 2D数组显示为简单图形

Question

I have to compare two 2d vectors ( vect_2d_a and vect_2d_b ) and as a result I will construct a 2d vector/2d array ( vect_compare_result ) comprising the difference in value of vect_2d_a and vect_2d_b .

Basically I can simply print the vect_compare_result and view it, but I would like to see it as a figure with simple boxes indicating the difference value in pixels (like colorbar in matlab).

Is it possible to display a simple 2d vector into a figure using Qimg or something?

Priya

Answer 1

Assuming that size of your vector is nxn :

QImage image(n, n, QImage::Format_RGB32);
QRgb value;

for (int i=0;i<N;++i) {
    for (int j=0;j<N;++j) {
        value = getColor(vect_compare_result); //a function that returns color based on value
        image.setPixel(i, j, value);
    }
}

If you want your pixels to be bigger (like one box is 5x5 real pixels):

int box_size = 5;
QImage image(n * box_size, n * box_size, QImage::Format_RGB32);
QRgb value;

for (int i=0;i<N;++i) {
    for (int j=0;j<N;++j) {
        value = getColor(vect_compare_result);
        for (int k=0;k<box_size;++k)
            for (int l=0;l<box_size;++l)
                image.setPixel(i+k, j+l, value);
    }
}