addArc

Add new arc segment to horizontal curve of segmented road

Since R2025a

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    Syntax

    addArc(segmentedCurve,length,curvature)

    Description

    addArc(segmentedCurve,length,curvature) creates a new arc segment and adds it to the end of the horizontal curve of the segmented road specified by segmentedCurve. An arc segment is a road or part of a road that curves in an arc shape. The arc gradually changes curvature from the start value (such as 0, for a straight line) to the end value (1/R for a circular arc of radius R).

    example

    Examples

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    Create a roadrunner object, specifying the path to an existing project. For example, this code shows the path to a project, on a Windows® machine, located at "C:\RR\MyProject". This code assumes that RoadRunner is installed in the default location, and returns an object, rrApp, that provides functions for performing basic tasks such as opening, closing, and saving scenes and projects. 

    rrApp = roadrunner(ProjectFolder="C:\RR\MyProject");

    Note

    If you are opening RoadRunner from MATLAB® for the first time, or if you have changed the RoadRunner installation location since you last opened it from MATLAB, you can use the roadrunnerSetup function to specify new default project and installation folders to use when opening RoadRunner. You can save these folders between MATLAB sessions by selecting the Across MATLAB sessions option from the corresponding drop down.

    Create a new scene in RoadRunner by using the newScene function, specifying the roadrunner object rrApp. 

    newScene(rrApp)

    Create a RoadRunner authoring API object, rrAPI, that references the object for the current RoadRunner instance rrApp. The rrApi object enables you to programmatically author scenes, such as by adding and modifying road and lane components, using MATLAB.

    rrApi = roadrunnerAPI(rrApp);
    Extract the object for your scene from the Scene property of the authoring API object rrApi. The extracted Scene object enables you to specify the scene in which to add scene components, such as roads and lanes. 
    scn = rrApi.Scene;

    Specify the control points of the starting point forward direction of a road as positions along the X- and the Y- axes of the RoadRunner local coordinate system. Then, use the addSegmentedRoad function to add a segmented curve type road to the scene.

    startPoint = [-100 0];
startRoadDirection = [1 0];
rrRoad = addSegmentedRoad(scn,startPoint,startRoadDirection);

    Extract the horizontal curve of the segmented road. Then, use the addArc function to create an arc segment and add it to the horizontal curve. Specify the length of the arc segment as 30 m and its curvature as 1/20 m. 

    segmentedCurve = rrRoad.HorizontalCurve;
addArc(segmentedCurve,30,1/20)

    Input Arguments

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    Horizontal curve of a segmented road, specified as a SegmentedRoadCurve object.

    Length of the new arc segment, specified as a numeric scalar. Units are in meters.

    Data Types: double

    Curvature of the new arc segment, specified as a numeric scalar in reciprocal meters (1/m). Curvature is defined as the reciprocal of the radius (1/radius). For example, an arc with a 50 m radius has curvature as 1/50. Positive and negative curvature values indicate curves to the right and left, respectively. Length of curvature of the arc segment, specified as a numeric scalar.

    The curvature measures how sharply a road bends. The curvature of a straight road is zero, while the higher the curvature of a curved road, the tighter the turn. Therefore, a small-radius turn (a sharp curve) has high curvature, and a large-radius turn (a gentle curve) has low curvature.

    Data Types: double

    Version History

    Introduced in R2025a

    See Also

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