My professor gave use the code to a function that draws a line in the grid. I have made my class function but I am not sure how to use it with this function he gave us.

``````void drawLineInGrid(char grid[][MAX_Y], const Line &line)
{
int xDifference, yDifference, xIncrement, yIncrement, error;
int point1X = line.getX1(), point1Y = line.getY1(), point2X = line.getX2(), point2Y = line.getY2();
// find the difference between the x & y coordinates of the points.
xDifference = point2X - point1X;
yDifference = point2Y - point1Y;
// set the increment to 1 or -1 depending on if you need to count up/down/left/right to get from
// point1X to point2X and point1Y to point2Y
xIncrement = xDifference > 0 ? 1 : -1;
yIncrement = yDifference > 0 ? 1 : -1;
// get the absolute value of the differences
xDifference = abs(xDifference);
yDifference = abs(yDifference);
if(xDifference >= yDifference) // printing mostly horizontal lines
{
yDifference <<= 1;
error = yDifference - xDifference;  // how fast you move up/down
xDifference <<= 1;
while (point1X != point2X)
{
grid[point1X][point1Y] = 'o';
if(error >= 0)
{
point1Y += yIncrement;
error-= xDifference;
}
error += yDifference;
point1X += xIncrement;
}
}
else // printing more vertical (steeper) lines
{
xDifference <<= 1;
error = xDifference - yDifference; // how fast you move left/right
yDifference <<= 1;
while (point1Y != point2Y)
{
grid[point1X][point1Y] = 'o';
if(error >= 0)
{
point1X += xIncrement;
error -= yDifference;
}
error += xDifference;
point1Y += yIncrement;
}
}
//grid[point1X][point1Y] = 'o'; // print last point (not needed because we put 'B' there.
grid[line.getX1()][line.getY1()] = 'A'; // Should be global constants, but
grid[line.getX2()][line.getY2()] = 'B'; // since I'm giving you just one function...
}``````

This is what I am trying to do for it to draw the first line but it is not working.

``````Line myLines[5];
drawLineInGrid(grid[][MAX_Y], Line &myLines[0])``````

The first parameter is a two dimenaional array of characters, declared something like this: `char grid[20][MAX_Y];` . The second parameter is a single Line object passed by reference.

``````char grid[5][MAX_Y];
Line line;
drawLineInGrid(grid,line)``````

I assume you need to initialize the grid with some values before calling that function.

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