The mathematics behind interpolations

rodolforg · March 27, 2021, 7:24am

If you can read C++ (and Synfig beast), here is the starting point of the related code location:

synfig/synfig/blob/1ffe5c321e0c8c6a13168e6a4f65025f4fbd0537/synfig-core/src/synfig/valuenodes/valuenode_animatedinterface.cpp#L397


			{
				ret->set_before(INTERPOLATION_LINEAR);
				ret->set_after(INTERPOLATION_LINEAR);
			}

			animated.animated_changed();

			return ret;
		}

		virtual void on_changed()
		{
			if (getenv("SYNFIG_DEBUG_ON_CHANGED"))
				printf("%s:%d _Hermite::on_changed()\n", __FILE__, __LINE__);

			if(animated.waypoint_list_.size()<=1)
				return;
			std::sort(animated.waypoint_list_.begin(), animated.waypoint_list_.end());

			r=animated.waypoint_list_.front().get_time();
			s=animated.waypoint_list_.back().get_time();