如何在vb中picturebox控件里画矩形筐答:Private Sub Command1_Click()Picture1.Line (1000, 1000)-(1000, 2000), RGB(255, 0, 0)Picture1.Line (1000, 2000)-(2000, 2000), RGB(0, 255, 0)Picture1.Line (2000, 2000)-(2000, 1000), RGB(0, 0, 255)Picture1.Line (2000, 1000)-(1000, 1000), RGB(0, 0, 0)End...