public static void DrawPixel(ref MaskData data, int x, int y, bool setTo)
{
if (setTo)
{
data = data.LazyCopyExpandToContain(new Rectangle(x, y, 1, 1));
}
if (data.Bounds.Contains(x, y))
{
data[x, y] = setTo;
}
}
public static void DrawLine(ref MaskData data, int x1, int y1, int x2, int y2, bool setTo)
{
data = data.LazyCopyExpandToContain(Rectangle.Union(new Rectangle(x1, y1, 1, 1), new Rectangle(x2, y2, 1, 1)));
int x = x1;
int y = y1;
int dx = x2 - x1;
int dy = y2 - y1;
int x_inc = (dx < 0) ? -1 : 1;
int l = System.Math.Abs(dx);
int y_inc = (dy < 0) ? -1 : 1;
int m = System.Math.Abs(dy);
int dx2 = l << 1;
int dy2 = m << 1;
if ((l >= m))
{
int err_1 = dy2 - l;
for (int i = 0; i < l; i++)
{
data[x, y] = setTo;
if (err_1 > 0)
{
y += y_inc;
err_1 -= dx2;
}
err_1 += dy2;
x += x_inc;
}
}
else
{
int err_1 = dx2 - m;
for (int i = 0; i < m; i++)
{
data[x, y] = setTo;
if (err_1 > 0)
{
x += x_inc;
err_1 -= dy2;
}
err_1 += dx2;
y += y_inc;
}
}
data[x, y] = setTo;
}
