private void btn_IsAbandoned_Click(object sender, EventArgs e)
{
var result = Gravity.IsAbandoned(_canvas.GetAllObject());
if (result.Count != 0)
{
btn_IsAbandoned.ForeColor = Color.Red;
Abandoned();
}
else
{
btn_IsAbandoned.ForeColor = Color.ForestGreen;
}
}
