Sketch.autoConstrain Method

Parent Object: Sketch
Defined in namespace "adsk::fusion" and the header file is <Fusion/Sketch/Sketch.h>

Description

Auto constrains the sketch using the information provided by the input object. The result depends on the resultOption set on the input. Each option produces a complete valid result. Option 3 may use SketchFixer to adjust small geometric inaccuracies.

Syntax

"sketch_var" is a variable referencing a Sketch object.

returnValue = sketch_var.autoConstrain(input)
"sketch_var" is a variable referencing a Sketch object.

#include <Fusion/Sketch/Sketch.h>

returnValue = sketch_var->autoConstrain(input);
"sketch_var" is a variable referencing a Sketch object.

returnValue = sketch_var.autoConstrain(input);

Return Value

Type Description
AutoConstrainResult Returns an AutoConstrainResult object where information about how the sketch was constrained can be obtained. Returns null in the case of a failure or if the input is invalid.

Parameters

Name Type Description
input AutoConstrainInput The AutoConstrainInput object that defines the various settings to use when fully constraining the sketch. The input object must be associated with this sketch (created by this sketch's createAutoConstrainInput method).

Samples

Name Description
AutoConstrain Sample Demonstrates using the AutoConstrain API to automatically add geometric constraints and dimensions to a sketch. This sample creates a simple sketch with a rectangle and circle, then applies automatic constraints using the origin point as a datum.

Version

Introduced in version January 2026