/// <summary>
/// rescales the grid to a larger or smaller image
/// </summary>
/// <param name="original_image_width"></param>
/// <param name="original_image_height"></param>
/// <param name="new_image_width"></param>
/// <param name="new_image_height"></param>
/// <returns></returns>
public grid2D Scale(int original_image_width, int original_image_height,
int new_image_width, int new_image_height)
{
polygon2D new_perimeter = perimeter.Copy();
for (int i = 0; i < new_perimeter.x_points.Count; i++)
{
float x = (float)new_perimeter.x_points[i] * new_image_width / original_image_width;
float y = (float)new_perimeter.y_points[i] * new_image_height / original_image_height;
new_perimeter.x_points[i] = x;
new_perimeter.y_points[i] = y;
}
grid2D new_grid = new grid2D(cell.Length, cell[0].Length);
new_grid.init(cell.Length, cell[0].Length,
new_perimeter, 0, false);
return (new_grid);
}
