Method motion_2d

plugins/single_plugins/wrot.cpp:114–141

    };

    void motion_2d(int x, int y)
    {
        auto tr = wf::ensure_named_transformer<wf::scene::view_2d_transformer_t>(
            current_view, wf::TRANSFORMER_2D, transformer_2d, current_view);

        current_view->get_transformed_node()->begin_transform_update();
        auto g = current_view->get_geometry();

        double cx = g.x + g.width / 2.0;
        double cy = g.y + g.height / 2.0;

        double x1 = last_position.x - cx, y1 = last_position.y - cy;
        double x2 = x - cx, y2 = y - cy;

        if (vlen(x2, y2) <= reset_radius)
        {
            current_view->get_transformed_node()->end_transform_update();
            current_view->get_transformed_node()->rem_transformer(transformer_2d);
            return;
        }

        /* cross(a, b) = |a| * |b| * sin(a, b) */
        tr->angle -= std::asin(cross(x1, y1, x2, y2) / vlen(x1, y1) / vlen(x2,
            y2));

        current_view->get_transformed_node()->end_transform_update();
        last_position = {1.0 * x, 1.0 * y};
    }

    void motion_3d(int x, int y)
    {