This command enables a circular curve to be drawn independently. In other words, a curve which does not belong to any alignment and is not related to any road design element. The same result can be obtained by drawing an arch directly on CAD.
The following data may be entered in the dialog box:
X,Y Coordinates. Coordinates of the beginning of the curve. They may be entered numerically or graphically by clicking on the < button.
Azimuth. Initial azimuth of the circular curve, in hundredths of a degree. Its value may be typed into the relevant box or it may be designated graphically with the < button situated to its right.
Radius. Radius of the arch, with its sign (positive if it rotates clockwise, negative if it rotates counterclockwise).
Length. Length developed by the arch in drawing units.
Arch. Azimuth travelled by the circular arch in hundredths of a degree.
Az. Output Azimuth at end of arch in hundredths of a degree.
If the Radius, Length or Arch fields are modified, the rest are recalculated automatically with the relevant error controls.
The Apply button draws the desired curve with the current values without having to exit the dialog box. Once the OK button is clicked, the curve will be incorporated into the current drawing.
The Details button shows detailed information about all the curve’s geometrical parameters, as explained in this chapter’s introduction.
The Invert button changes the origin and sign of the curve, so that the final point becomes the origin, the final azimuth the initial azimuth, and vice versa.
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