Square /
portrait /
landscape.

{
  "module": "Compo 6.01",
  "name": "square_portrait_landscape_behavior",
  "version": "1.1-corrective",
  "canonical_main_title": "Square / portrait / landscape behavior",
  "topic": "06_ФОРМАТ_ПОСТЕРА_И_СООТНОШЕНИЕ_СТОРОН",
  "scope": "EXACT_ORIENTATION_CLASS_EXPLICIT_NEAR_SQUARE_BEHAVIOR_CLASS_AND_AXIS_AFFORDANCE",
  "consumes": [
    "Compo6.00.CanvasDescriptor",
    "Compo6.00.canvas.geometry.aspectRatioWH",
    "Compo6.00.canvas.geometry.logAspectRatio",
    "Compo6.00.canvas.axisRelation",
    "OrientationBehaviorPolicy"
  ],
  "provides": [
    "OrientationBehaviorPolicy",
    "FormatClassResult",
    "FormatBehaviorDescriptor",
    "MetricResult[canvas.format.aspectDistanceLog]",
    "MetricResult[canvas.format.behaviorExcessElongationLog]",
    "MetricResult[canvas.format.confidence]",
    "formatClassRef for CanvasDescriptor",
    "CanvasFormatCorrectionRequest[]"
  ],
  "owns_metrics": [
    "canvas.format.aspectDistanceLog",
    "canvas.format.behaviorExcessElongationLog",
    "canvas.format.confidence"
  ],
  "descriptors_only": [
    "canvas.format.exactClass",
    "canvas.format.behaviorClass",
    "canvas.format.majorAxis",
    "canvas.format.minorAxis",
    "canvas.format.axisAffordance",
    "canvas.format.squareLikeToleranceLog",
    "canvas.format.policyRef",
    "canvas.format.status"
  ],
  "orientation_behavior_policy_schema": {
    "policyRef": "string",
    "squareLikeLogTolerance": "finite >=0",
    "classificationMode": "LOG_ASPECT_DISTANCE",
    "source": "STYLE_PRESET|EMPIRICAL|INITIAL_HEURISTIC|STANDARD",
    "confidence": "0..1",
    "provenance": "object",
    "no_hidden_default": "if policy is absent, only exactClass is available; behaviorClass=N_A"
  },
  "format_class_schema": {
    "canvasRef": "Compo6.00 canvas",
    "exactClass": "SQUARE|PORTRAIT|LANDSCAPE",
    "behaviorClass": "SQUARE_LIKE|PORTRAIT_LIKE|LANDSCAPE_LIKE|N_A",
    "aspectDistanceLog": "abs(logAspectRatio)",
    "behaviorExcessElongationLog": "max(0, abs(logAspectRatio)-squareLikeLogTolerance) when behavior policy exists, else N_A",
    "majorAxis": "NONE|X|Y",
    "minorAxis": "NONE|X|Y",
    "axisAffordance": "AXES_BALANCED|HORIZONTAL_MAJOR|VERTICAL_MAJOR|N_A",
    "policyRef": "optional",
    "confidence": "0..1",
    "status": "OK|PARTIAL|N_A|INVALID",
    "provenance": "object"
  },
  "exact_class_semantics": {
    "SQUARE": "Compo6.00.axisRelation == WIDTH_EQ_HEIGHT",
    "LANDSCAPE": "Compo6.00.axisRelation == WIDTH_GT_HEIGHT",
    "PORTRAIT": "Compo6.00.axisRelation == WIDTH_LT_HEIGHT",
    "note": "exact class is a direct re-expression of 6.00 axisRelation; no tolerance"
  },
  "behavior_class_semantics": {
    "distance": "d = abs(logAspectRatio)",
    "SQUARE_LIKE": "d <= squareLikeLogTolerance",
    "LANDSCAPE_LIKE": "logAspectRatio > squareLikeLogTolerance",
    "PORTRAIT_LIKE": "logAspectRatio < -squareLikeLogTolerance",
    "boundary_rule": "inclusive square-like band at ±tolerance",
    "no_policy": "behaviorClass=N_A",
    "important": "behavior class is a format-response category, not an aesthetic ranking"
  },
  "axis_affordance_semantics": {
    "SQUARE_LIKE": "majorAxis=NONE, minorAxis=NONE, AXES_BALANCED",
    "LANDSCAPE_LIKE": "majorAxis=X, minorAxis=Y, HORIZONTAL_MAJOR",
    "PORTRAIT_LIKE": "majorAxis=Y, minorAxis=X, VERTICAL_MAJOR",
    "meaning": "which canvas axis offers the longer geometric span beyond the square-like tolerance",
    "forbidden_inference": "does not imply preferred reading direction, eye-flow, object alignment, hierarchy, typography direction, or composition quality"
  },
  "distance_metrics": {
    "aspectDistanceLog": "abs(log(width/height)); dimensionless, symmetric under axis swap",
    "behaviorExcessElongationLog": "max(0, aspectDistanceLog - tolerance); dimensionless; zero inside square-like band",
    "scale_invariance": "both are invariant under common positive scaling of width and height",
    "axis_swap": "aspectDistanceLog and behaviorExcessElongationLog unchanged; portrait-like/landscape-like swap"
  },
  "ownership_map": {
    "6.00": "raw canvas extent/aspect ratio/axis relation",
    "6.01": "exact format class, explicit near-square behavior class, major-axis affordance",
    "6.02": "physical size/A-series/DPI/viewing context",
    "6.03": "normalization and cross-format scale invariance",
    "6.04": "adaptation/reflow hooks, hysteresis/change handling and Topic6 regression"
  },
  "behavior_policy": {
    "what_6.01_can_say": [
      "the canvas is exactly square/portrait/landscape",
      "under policy P it behaves square-like/portrait-like/landscape-like",
      "under policy P the format exposes horizontal/vertical/balanced axis affordance"
    ],
    "what_6.01_cannot_say": [
      "portrait composition should use centered hierarchy",
      "landscape should place text left and image right",
      "square is universally more balanced",
      "major axis is the eye-flow axis",
      "orientation change requires a specific reflow action"
    ]
  },
  "hysteresis_boundary": {
    "owner": "Compo6.04",
    "reason": "classification over a single canvas state belongs to 6.01; temporal/stateful transition stabilization under resize belongs to adaptation hooks",
    "6.01_behavior": "stateless deterministic classification for one descriptor+policy"
  },
  "hard_constraints": [
    "one metric = one owner",
    "6.01 consumes 6.00 aspect geometry and must not recompute canvas extent from content",
    "exactClass is derived only from exact 6.00 axisRelation",
    "6.00 axisRelation must be consistent with aspectRatioWH/logAspectRatio; contradictory upstream geometry is INVALID rather than silently trusting one representation",
    "behaviorClass requires an explicit OrientationBehaviorPolicy; absent policy means behaviorClass=N_A",
    "squareLikeLogTolerance must be finite >=0 and is never silently defaulted",
    "the square-like band is symmetric in log-aspect space around logAspectRatio=0",
    "portrait-like and landscape-like classes swap under width/height axis exchange",
    "aspectDistanceLog is symmetric under axis swap and scale invariant",
    "behaviorExcessElongationLog is policy-relative and scale invariant",
    "majorAxis is a canvas geometry affordance, not a reading/attention/eye-flow direction",
    "no layout placement rule, margin rule, typography rule or object alignment rule is owned by 6.01",
    "stateful hysteresis/reflow decisions remain 6.04",
    "physical size/DPI/A-series/viewing context remain 6.02",
    "normalization contract remains 6.03",
    "safe/bleed/margin zones remain Topic7",
    "grid occupancy remains Topic8",
    "free-space remains Topic5",
    "visual mass remains Topic4",
    "global balance/hierarchy/eye-flow remain future owners",
    "more square-like, portrait-like or landscape-like is not universally better",
    "N/A != 0",
    "no beautyScore"
  ],
  "initial_heuristics": {
    "reference_square_like_log_tolerance": {
      "value": 0.05,
      "provenance": "STYLE_PRESET",
      "note": "used in Visual Lab/tests only; not a global default"
    },
    "numeric_epsilon": {
      "value": 1e-12,
      "provenance": "IMPLEMENTATION_HEURISTIC"
    }
  },
  "correction_policy": {
    "foreign_content_mutation": "FORBIDDEN",
    "invalid_canvas_geometry": "route to Compo6.00",
    "missing_behavior_policy": "request explicit OrientationBehaviorPolicy; do not guess near-square threshold",
    "physical_context_issue": "route to Compo6.02",
    "normalization_issue": "route to Compo6.03",
    "transition_hysteresis_or_reflow_issue": "route to Compo6.04",
    "safe_zone_issue": "route to Topic7"
  },
  "deferred_inputs": [
    "Compo6.02 physical size/A-series/DPI/viewing context",
    "Compo6.03 normalization/scale invariance contract",
    "Compo6.04 adaptation hooks/hysteresis/reflow/tests",
    "Topic7 safe/bleed zones",
    "Topic8 grids",
    "future global balance/hierarchy/eye-flow"
  ],
  "recompute_when": [
    "Compo6.00 aspectRatioWH/logAspectRatio/axisRelation changes",
    "OrientationBehaviorPolicy changes",
    "policy confidence/provenance changes"
  ],
  "finality": "FORMAT_CLASS_AND_STATELESS_ORIENTATION_BEHAVIOR_ONLY",
  "input_consistency": {
    "rule": "6.00 aspectRatioWH/logAspectRatio/axisRelation must describe the same orientation",
    "square": "aspectRatioWH == 1 requires WIDTH_EQ_HEIGHT",
    "landscape": "aspectRatioWH > 1 requires WIDTH_GT_HEIGHT",
    "portrait": "aspectRatioWH < 1 requires WIDTH_LT_HEIGHT",
    "mismatch": "INVALID input; 6.01 does not choose which upstream field to trust"
  }
}