Handlers

Scroll Zoom

• Trackpad vs wheel detection with onWheelModeChange(mode)
• around: 'center'|'pointer' keeps target under cursor during zoom
• Inertia smoothing with reduced tiny deltas on high-DPR devices

Mouse Pan / Rotate / Pitch

• Pan: left drag with rubberband resistance near pan bounds and inertia
• Rotate: right drag; around: 'pointer' preserves world point under cursor
• Pitch: Shift + drag; around: 'pointer' preserves world point

Touch (Two-finger)

• Pinch (zoom) + rotate: locks mode and preserves centroid when around: 'pinch'
• Two-finger pitch: vertical movement maps to pitch; centroid preserved
• Rubberband resistance during pan mode and during inertia
• Auto profile: when autoTouchProfile is enabled (default), touch-capable devices get conservative defaults (rotateThresholdDeg: 0.5, pitchThresholdPx: 12, zoomThreshold: 0.04) unless you override them in handlers.touch.

Rotation Sensitivity

• touch.rotateStartThresholdDeg: degrees to START rotation; higher = less sensitive (default: 1.0).
• touch.rotateContinueThresholdDeg: degrees to CONTINUE rotation after it has started (default: 0.5 or touch.rotateThresholdDeg if provided).
• touch.rotateDebounceMs: suppress rotation for the first N ms of a two‑finger gesture, letting zoom establish first (default: 100).

Example:

new HandlerManager(el, transform, helper, {
  touch: {
    rotateStartThresholdDeg: 1.0,
    rotateContinueThresholdDeg: 0.5,
    rotateDebounceMs: 100,
  },
});

Keyboard

• Arrow pan, +/- zoom, Q/E rotate, PageUp/Down pitch

Dblclick / Double-tap, Box Zoom

• Dblclick/tap zoom around pointer; Shift invert
• Box zoom with Shift + drag; fit bounds via projection-based solver