Vec2 pMathCoord = ConvertScrP2MathP(P);
std::string messStr =   "( " + std::to_string((int)pMathCoord.x) + ", " + std::to_string((int)pMathCoord.y) + ")";
String message = Unicode::Widen(messStr);
font(message).drawAt(表示位置の指定, Palette::Black);