@ue-too/board / index / clampRotateByHandler

函式: clampRotateByHandler()

clampRotateByHandler(delta, camera, config): number

定義於: packages/board/src/camera/camera-rig/rotation-handler.ts:242

Handler pipeline step that clamps "rotate by" deltas to prevent angular boundary violations.

參數

delta

number

Rotation angle change in radians

camera

BoardCamera

Current camera instance (provides current rotation and boundaries)

config

RotationHandlerClampConfig

Clamping configuration

回傳

number

Adjusted delta that respects rotation boundaries

備註

This handler ensures that applying the delta won't exceed rotation boundaries.

Algorithm:

1. Calculate potential new rotation (current + delta)
2. Normalize angle to [0, 2π) range
3. Clamp to rotation boundaries
4. Calculate shortest angular distance from current to clamped angle
5. Return that distance as the new delta

Behavior:

• If clampRotation is false: Returns delta unchanged
• If clampRotation is true: Adjusts delta to stay within boundaries

The resulting delta may be zero if already at a boundary and trying to rotate further.

範例

camera.rotation = Math.PI * 0.4;  // 72 degrees
camera.rotationBoundaries = { max: Math.PI / 2 };  // Max 90 degrees

const config: RotationHandlerClampConfig = {
  clampRotation: true
};

const delta = Math.PI * 0.2;  // Try to rotate 36 degrees (would exceed max)
const clamped = clampRotateByHandler(delta, camera, config);
// clamped ≈ 0.314 radians (18 degrees - only rotate to boundary)

參閱

• normalizeAngleZero2TwoPI for angle normalization
• clampRotation for boundary clamping
• angleSpan for calculating angular distance