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jump() template<typename FirstValueType, typename... RemainingValueTypes> auto jump ( std::size_t target_key_frame ) -> tween_value_t Jumps to a specific keyframe index. Moves the tween to the exact position of a keyframe. Useful for resetting to known points or implementing discrete state animations. Triggers event::jump listeners. Parameters target_key_frame Zero-based keyframe index (clamped to valid range) Returns Value at the target keyframe auto t = tweeny::from(0).to(50).during(30U).to(100).during(30U).build(); t.jump(0); // Jump to first keyframe (value: 0) t.jump(1); // Jump to second keyframe (value: 50) t.jump(2); // Jump to third keyframe (value: 100)