Add get_accessory_metrics for hip-anchored bag positioning

[Copilot]

Implements automatic bag placement logic in Python (api/peacock_core.py), mirroring the positioning contract defined in robert-engine.ts. The function derives bag size from shoulder width (or canvas fallback) and positions it relative to the hip Y-anchor, with a fixed 88% opacity.

Changes

• api/peacock_core.py

  • Added _ACCESSORY_ALPHA = 0.88 constant
  • Added get_accessory_metrics(img_ar, anchors, canvas_dim):
    • hasBody=True → bag_w = shoulderW × 0.8, bag_x = cx + shoulderW × 0.6
    • hasBody=False → bag_w = canvas.w × 0.18, bag_x = cx + canvas.w × 0.12
    • bag_h = bag_w × img_ar, bag_y = hipY − bag_h × 0.3

• tests/test_accessory_metrics.py — 14 new unit tests covering both body/no-body branches and edge cases (zero hip, square AR, alpha invariance)

metrics = get_accessory_metrics(
    img_ar=1.5,
    anchors={"cx": 320, "shoulderW": 200, "hipY": 400, "hasBody": True},
    canvas_dim={"w": 640, "h": 960},
)
# {"x": 440.0, "y": 346.0, "w": 160.0, "h": 240.0, "alpha": 0.88}

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Project	Deployment	Actions	Updated (UTC)
tryonyou-pilot	Error		Apr 7, 2026 1:37pm