c++/cli で　imageをmouseでdrag gcnewしないのがミソ

private: System::Void pictureBox1_MouseDown(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e) {

bDrag = true;

ptStart = e->Location;

}

private: System::Void pictureBox1_MouseUp(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e) {

bDrag = false;

}

private: System::Void pictureBox1_MouseMove(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e) {

if (bDrag) {

Point p = Point(e->Location.X - ptStart.X, e->Location.Y - ptStart.Y);

panel1->AutoScrollPosition = Point(

-(panel1->AutoScrollPosition.X) - p.X,

-(panel1->AutoScrollPosition.Y) - p.Y

);

}

}