In the file fill.cpp$,$ write a function using canvas, which is a $2$ dimensional array declared to be ROWS by COLS, and the function prototype

void drawStripe$($int width, Pixel canvas$[][$COLS$],$int nRows, int nCols$)$;

that sets the diagonal of the canvas to BLACK

BLACK is a value of the enumeration type Pixel defined in fill.h and just like in Assignment $()/()$#$8.$

The diagonal stripe has a width and the stripe is to precondition:

Office on the web Frame and corner of the canvas

$-$ width $()/((\{\}^(3)0/))$

$-$ nRows $()/((/$leq $/))$ ROWS

$-$ nCols $()/((/$leq $/))$ COLS

When setting the pixels to BLACK in drawStripe, the BLACK pixels must be within the boundaries of the nRows by nCols defined canvas.

The unittest$\_($f$)$ill$.$cpp has many test cases with expected output.

If you do not want debugging output, uncomment the $()/()$#define NDEBUG in the unittest$\_($f$)$ill$.$cpp

See the next page for examples printed out when running test$\_($f$)$ill

$\{($: rows $=7$ columns $=7$ stripe width $=1)$:$\}$

$\{($: $+------+)$:$\}$