def add_unique_template_variables(self, options):
        """Update map template variables specific to linestring visual"""

        # set line stroke dash interval based on line_stroke property
        if self.line_stroke in ["dashed", "--"]:
            self.line_dash_array = [6, 4]
        elif self.line_stroke in ["dotted", ":"]:
            self.line_dash_array = [0.5, 4]
        elif self.line_stroke in ["dash dot", "-."]:
            self.line_dash_array = [6, 4, 0.5, 4]
        elif self.line_stroke in ["solid", "-"]:
            self.line_dash_array = [1, 0]
        else:
            # default to solid line
            self.line_dash_array = [1, 0]

        # common variables for vector and geojson-based linestring maps
        options.update(dict(
            colorStops=self.color_stops,
            colorProperty=self.color_property,
            colorType=self.color_function_type,
            defaultColor=self.color_default,
            lineColor=self.color_default,
            lineDashArray=self.line_dash_array,
            lineStroke=self.line_stroke,
            widthStops=self.line_width_stops,
            widthProperty=self.line_width_property,
            widthType=self.line_width_function_type,
            defaultWidth=self.line_width_default,
            highlightColor=self.highlight_color
        ))

        # vector-based linestring map variables
        if self.vector_source:
            options.update(dict(
                vectorColorStops=[[0, self.color_default]],
                vectorWidthStops=[[0, self.line_width_default]],
            ))

            if self.color_property:
                options.update(vectorColorStops=self.generate_vector_color_map())
        
            if self.line_width_property:
                options.update(vectorWidthStops=self.generate_vector_numeric_map('line_width'))

        # geojson-based linestring map variables
        else:
            options.update(geojson_data=json.dumps(self.data, ensure_ascii=False))
Update map template variables specific to linestring visual