[Grafika] ras2

/*
Dawid Mocek
*/
void my_line(View& view, const unsigned short& x1, const unsigned short& y1,
        const unsigned short& x2, const unsigned short& y2)
{
    double y, x, xi, yi, antialias;
    int i, down_color, up_color;

    //iteracja po y'ach
    if (std::abs(y1 - y2) > std::abs(x1 - x2))
    {
        xi = (x2 - x1) / (double)(y2 - y1);//o ile przesuwac sie po osi x

        if (y2 > y1)
        {
            x = x1;
            for (i = y1; i <= y2; i++)
            {
                x += xi;

                //antyaliasing
                antialias = x - (int)(x);
                if (antialias < 0.25)
                {
                    view(unsigned(x), i) = Pixel(0, 0, 255);
                }
                else if (antialias > 0.75)
                {
                    view(unsigned(x) + 1, i) = Pixel(0, 0, 255);
                }
                else
                {
                    down_color = (unsigned char)(antialias * 255);
                    up_color = 255 - down_color;
                    view(unsigned(x), i) = Pixel(down_color, down_color, 255);
                    view(unsigned(x) + 1, i) = Pixel(up_color, up_color, 255);
                }
            }
        }
        else
        {
            x = x2;
            for (i = y2; i <= y1; i++)
            {
                x += xi;

                //antyaliasing
                antialias = x - (int)(x);
                if (antialias < 0.25)
                {
                    view(unsigned(x), i) = Pixel(0, 0, 255);
                }
                else if (antialias > 0.75)
                {
                    view(unsigned(x) + 1, i) = Pixel(0, 0, 255);
                }
                else
                {
                    down_color = (unsigned char)(antialias * 255);
                    up_color = 255 - down_color;
                    view(unsigned(x), i) = Pixel(down_color, down_color, 255);
                    view(unsigned(x) + 1, i) = Pixel(up_color, up_color, 255);
                }

            }

        }

    }
    else//iteracja po x'ach
    {
        yi = (y2 - y1) / (double)(x2 - x1);

        if (x2 > x1)
        {
            y = y1;
            for (i = x1; i <= x2; i++)
            {
                y += yi;

                //antyaliasing
                antialias = y - (int)(y);
                if (antialias < 0.25)
                {
                    view(i, unsigned(y)) = Pixel(0, 0, 255);
                }
                else if (antialias > 0.75)
                {
                    view(i, unsigned(y)+1) = Pixel(0, 0, 255);
                }
                else
                {
                    down_color = (unsigned char)(antialias * 255);
                    up_color = 255 - down_color;
                    view(i, unsigned(y)) = Pixel(down_color, down_color, 255);
                    view(i, unsigned(y)+1) = Pixel(up_color, up_color, 255);
                }
            }
        }
        else
        {
            y = y2;
            for (i = x2; i <= x1; i++)
            {
                y += yi;
                //antyaliasing
                antialias = y - (int)(y);
                if (antialias < 0.25)
                {
                    view(i, unsigned(y)) = Pixel(0, 0, 255);
                }
                else if (antialias > 0.75)
                {
                    view(i, unsigned(y) + 1) = Pixel(0, 0, 255);
                }
                else
                {
                    down_color = (unsigned char)(antialias * 255);
                    up_color = 255 - down_color;
                    view(i, unsigned(y)) = Pixel(down_color, down_color, 255);
                    view(i, unsigned(y) + 1) = Pixel(up_color, up_color, 255);
                }
            }
        }

    }
}