Class DragState

src/plot_state.rs:1341–1344

            )?;
            let x1 = data_value_to_plot_with_axis_range(
                vline1.x,
                widget.x_axis_scale,
                vline1.transform.as_ref(),
                Some(axis_ranges.0),
            )?;
            push_quad_as_triangles(&mut vertices, [x0, y0], [x1, y0], [x0, y1], [x1, y1]);
        }