Class FillSpan

src/plot_state.rs:917–921

        }
    }

    fn zoom_at_cursor(&mut self, scroll_y: f32, viewport: DVec2, zoom_x: bool, zoom_y: bool) {
        let zoom_factor = if scroll_y > 0.0 { 0.95 } else { 1.05 };

        let cursor_render_before = self.camera.screen_to_render(
            DVec2::new(self.cursor_position.x as f64, self.cursor_position.y as f64),
            viewport,
        );