roundrect                package:grid                R Documentation

_D_r_a_w _a _r_e_c_t_a_n_g_l_e _w_i_t_h _r_o_u_n_d_e_d _c_o_r_n_e_r_s

_D_e_s_c_r_i_p_t_i_o_n:

     Draw a _single_ rectangle with rounded corners.

_U_s_a_g_e:

     roundrectGrob(x=0.5, y=0.5, width=1, height=1,
                   default.units="npc",
                   r=unit(0.1, "snpc"),
                   just="centre",
                   name=NULL, gp=NULL, vp=NULL) 
     grid.roundrect(...) 

_A_r_g_u_m_e_n_t_s:

x, y, width, height: The location and size of the rectangle.

default.units: A string indicating the default units to use if 'x',
          'y', 'width', or 'height' are only given as numeric vectors.

       r: The radius of the rounded corners.

    just: The justification of the rectangle relative to its location.

    name: A name to identify the grob.

      gp: Graphical parameters to apply to the grob.

      vp: A viewport object or 'NULL'.

     ...: Arguments to be passed to 'roundrectGrob()'.

_D_e_t_a_i_l_s:

     At present, this function can only be used to draw _one_ rounded
     rectangle.

_E_x_a_m_p_l_e_s:

     grid.roundrect(width=.5, height=.5, name="rr")
     theta <- seq(0, 360, length=50)
     for (i in 1:50) 
         grid.circle(x=grobX("rr", theta[i]),
                     y=grobY("rr", theta[i]),
                     r=unit(1, "mm"),
                     gp=gpar(fill="black"))