void draw_corner_point(::nana::paint::graphics& graph, const rectangle& r)
{
graph.set_pixel(r.x, r.y);
graph.set_pixel(r.right() - 1, r.y);
graph.set_pixel(r.right() - 1, r.bottom() - 1);
graph.set_pixel(r.x, r.bottom() - 1);
}
void double_arrow_line(nana::paint::graphics & graph, int x, int y, color_t color, bool horizontal)
{
graph.set_pixel(x, y, color);
if(horizontal)
{
graph.set_pixel(x + 1, y, color);
graph.set_pixel(x + 4, y, color);
graph.set_pixel(x + 5, y, color);
}
else
{
graph.set_pixel(x, y + 1, color);
graph.set_pixel(x, y + 4, color);
graph.set_pixel(x, y + 5, color);
}
}