public JTSPointExpression<Point> startPoint() {
        if (startPoint == null) {
            startPoint = JTSGeometryExpressions.pointOperation(SpatialOps.START_POINT, mixin);
        }
        return startPoint;
    }
The start Point of this Curve.

@return start point
querydsl-spatial/src/main/java/com/querydsl/spatial/locationtech/jts/JTSCurveExpression.java