def demo_GeometricConstraints_addHorizontal(sketch: adsk.fusion.Sketch):
# Create a sketch line.
line = sketch.sketchCurves.sketchLines.addByTwoPoints(adsk.core.Point3D.create(0, 0, 0),
adsk.core.Point3D.create(0, 10, 0))
# Add a horizontal constraint to the sketch line.
constraints = sketch.geometricConstraints
horizontalConstraint = constraints.addHorizontal(line)