void uradlinp (xpos, ypos, rad1, rad2, theta, axis) CIRCLES.C Level 3
float xpos, ypos Coordinates of the center of the circle in user (plot) units .
float rad1, rad2 The line is drawn from rad1 to rad2 in plot units..
float theta The line is drawn at the angle theta in radians.
int axis The axis units used to specify the radial scaling. It can be either X_AXIS or Y_AXIS
uradlinp() draws a radial line centered on xpos, ypos at an angle of theta, between rad1 and rad2 in user units. The argument axis specifies which axis units are used to specify the two radii.