pirouette.posecode

# Reference: Agrippina Vaganova, "Basic Principles of Classical Ballet" (Pirouette en dehors)
# Reference: Royal Academy of Dance (RAD) Classical Ballet Syllabus
# Review status: Experimental (ballet UAT; pending peer review with dance-domain educator)
# Biomechanical note: Pirouette en dehors turns outward toward the gesture leg (clockwise on the left
# supporting foot). The dancer preps with a demi-plié and third-position arms (one front, one side),
# pushes up to relevé on the left ball of the foot with right leg in retiré/passé, bringing both arms
# to rounded first position at consistent chest height, and lands through a controlled demi-plié.
#
# Spotting evaluation:
# In physical ballet, spotting involves fixing gaze forward as the torso rotates, then rapidly whipping
# the cervical spine 360° to re-acquire the target before the body completes the revolution.
# Posecode v0.4 interpolates bone angles continuously across phase durations.
# Language recommendation: A dedicated `spot: <target>` or `gaze: <target>` construct that holds
# the head world orientation until a threshold angle (e.g. 120°) before triggering a high-speed
# saccadic snap to the target is the proposed mechanism for true biomechanical spotting.
# In this example, spotting instruction is conveyed via the coaching cue.

posecode exercise "Pirouette"
  rig humanoid
  pose start = first-position

  step "Prep - plié" 1.2s flow:
    knees: flex 40
    ankles: dorsiflex 12
    shoulder_left: flex 35
    elbow_left: flex 35
    shoulder_right: abduct 70
    elbow_right: flex 15
    ground-lock: foot_left
    reach: foot_right floor
    cue "Demi-plié preparation in first position, arms held in third (one front, one side)"

  step "Spot & spin" 1.4s flow:
    knee_left: flex 0
    ankle_left: plantarflex 35
    hip_right: flex 55
    hip_right: rotate-out 45
    knee_right: flex 110
    ankle_right: plantarflex 35
    shoulder_left: abduct 0
    shoulder_right: abduct 0
    shoulders: flex 35
    elbows: flex 35
    turn: 360
    pin: foot_left floor
    cue "Push to relevé on left ball of foot, retiré right knee, close arms in first, and spot 360° turn"

  step "Land through plié" 0.9s settle:
    hip_right: flex 0
    hip_right: rotate-out 0
    knee_right: flex 30
    ankle_right: dorsiflex 8
    knee_left: flex 30
    ankle_left: dorsiflex 8
    shoulders: flex 0
    shoulders: abduct 60
    elbows: flex 18
    ground-lock: feet
    cue "Complete the turn and absorb the landing in demi-plié with arms opening to second"

  step "Recover" 1.1s settle:
    knees: flex 0
    ankles: dorsiflex 0
    shoulders: abduct 0
    shoulders: flex 15
    elbows: flex 20
    ground-lock: feet
    cue "Straighten knees to first position with tall posture and arms rounded in bras bas"

  repeat 3