Draw Waveform from Mat

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Hi,

I'd like to draw a waveform Diagram from cv:Mat.
So I use the line()-Function with Point(int x, int y) inside.

I try it with:

Code:

line(waveY,Point(bin_w * (i - 1),wave_h) ,Point(bin_w * (i), ycrcb_planes[0].row(i).col(0)), Scalar(128, 128, 128), 2, 8, 0);

The Problem is, that cv Point need int x and int y. So I have to convert every single "Pixel" from
Matrix into an int value.

I need something like that:

Code:

 int value = (int) ycrcb_planes[0].row(i).col(0)