Curve Calculator dialog box
The Curve Calculator dialog box allows you to calculate curve parameters from inputs, using the Arc definition or Chord definition to define the Degree of curvature.
The curve parameters are presented in the following picture:
Arc definition
The Degree of curvature defined by the Arc definition means that the arc determines the degree of curvature. This definition is commonly used for roadway curves, where the degree of the curve corresponds to an angle of an arc of 100 units.
Chord definition
The Degree of curvature defined by the Chord definition means that the chord determines the degree of curvature. This definition is commonly used for railway curves, where the degree of the curve corresponds to a chord of 100 units.
The calculation is performed based on the Radius or the Delta angle.
- Radius
- If checked, the calculation starts from a fixed radius.
- Delta angle
- If checked, the calculation starts from a fixed delta angle.
- Tangent length
- Sets the tangent length of the curve.
- Arc length
- Sets the arc length of the curve.
- Chord length
- Sets the chord length of the curve.
- External distance
- Sets the external length of the curve.
- Mid-ordinate distance
- Sets the mid-ordinate length of the curve.
- Degree of curvature
- Sets the degree of curvature. Based on Arc definition, the degree of curvature is determined by the arc, and based on Chord definition, the degree of curvature is determined by the chord.
- Select arc in drawing
- Allows you to select an arc from the drawing.
- Draw curve
- Temporarily dismisses the Curve Calculator dialog box to draw the calculated curve in the drawing.