@esotericsoftware/spine-core
Version:
The official Spine Runtimes for the web.
189 lines • 30.6 kB
JavaScript
/******************************************************************************
* Spine Runtimes License Agreement
* Last updated April 5, 2025. Replaces all prior versions.
*
* Copyright (c) 2013-2025, Esoteric Software LLC
*
* Integration of the Spine Runtimes into software or otherwise creating
* derivative works of the Spine Runtimes is permitted under the terms and
* conditions of Section 2 of the Spine Editor License Agreement:
* http://esotericsoftware.com/spine-editor-license
*
* Otherwise, it is permitted to integrate the Spine Runtimes into software or
* otherwise create derivative works of the Spine Runtimes (collectively,
* "Products"), provided that each user of the Products must obtain their own
* Spine Editor license and redistribution of the Products in any form must
* include this license and copyright notice.
*
* THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
* BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
/**
* Tracks movement of a host runtime object and applies that movement to skeleton physics constraints.
*
* This is useful for runtimes where a Spine skeleton is displayed by a movable object or container.
* When enabled, changes in the host object's position are converted to skeleton coordinates and passed to
* {@link Skeleton.physicsTranslate}. Changes in its rotation are passed to {@link Skeleton.physicsRotate}.
*
* Movement inheritance is opt-in. Position and rotation inheritance default to `0`, so
* {@link applyTransformMovement} returns immediately until one of the inheritance values is non-zero.
*/
export class SkeletonPhysicsMovement {
skeleton;
adapter;
positionInheritanceFactorX = 0;
positionInheritanceFactorY = 0;
rotationInheritanceFactor = 0;
hasLastTransform = false;
lastX = 0;
lastY = 0;
lastZ = 0;
lastRotation = 0;
currentTransform = { x: 0, y: 0, z: 0, rotation: 0 };
currentPosition = { x: 0, y: 0, z: 0 };
lastPosition = { x: 0, y: 0, z: 0 };
/**
* Creates a movement tracker for a skeleton displayed by a host runtime object.
* @param skeleton The skeleton whose physics constraints receive inherited movement.
* @param adapter Runtime-specific hooks used to read and convert the host object's transform.
* @param options Initial movement inheritance values.
*/
constructor(skeleton, adapter, options = {}) {
this.skeleton = skeleton;
this.adapter = adapter;
this.positionInheritanceFactorX = options.positionInheritanceX ?? 0;
this.positionInheritanceFactorY = options.positionInheritanceY ?? 0;
this.rotationInheritanceFactor = options.rotationInheritance ?? 0;
}
/** Horizontal position inheritance factor. `0` disables horizontal position inheritance. */
get positionInheritanceX() {
return this.positionInheritanceFactorX;
}
/** Vertical position inheritance factor. `0` disables vertical position inheritance. */
get positionInheritanceY() {
return this.positionInheritanceFactorY;
}
/**
* Sets how much host object translation is inherited by skeleton physics constraints.
* Use `(1, 1)` for normal inheritance, or `(0, 0)` to disable position inheritance.
* @param x The horizontal position inheritance factor.
* @param y The vertical position inheritance factor.
*/
setPositionInheritance(x, y) {
const wasDisabled = this.positionInheritanceFactorX === 0 && this.positionInheritanceFactorY === 0;
const isEnabled = x !== 0 || y !== 0;
this.positionInheritanceFactorX = x;
this.positionInheritanceFactorY = y;
if (wasDisabled && isEnabled)
this.resetPosition();
}
/** Rotation inheritance factor. `0` disables rotation inheritance. */
get rotationInheritance() {
return this.rotationInheritanceFactor;
}
/**
* Sets how much host object rotation is inherited by skeleton physics constraints.
* @param value The rotation inheritance factor.
*/
set rotationInheritance(value) {
const wasDisabled = this.rotationInheritanceFactor === 0;
this.rotationInheritanceFactor = value;
if (wasDisabled && value !== 0)
this.resetRotation();
}
/** Resets the previous position used to calculate inherited translation. */
resetPosition() {
const transform = this.currentTransform;
const readRotation = !this.hasLastTransform && this.rotationInheritanceFactor !== 0;
this.adapter.readTransform(transform, readRotation);
this.lastX = transform.x;
this.lastY = transform.y;
this.lastZ = transform.z;
if (readRotation)
this.lastRotation = transform.rotation;
this.hasLastTransform = true;
}
/** Resets the previous rotation used to calculate inherited rotation. */
resetRotation() {
const transform = this.currentTransform;
this.adapter.readTransform(transform, true);
this.lastRotation = transform.rotation;
if (!this.hasLastTransform) {
this.lastX = transform.x;
this.lastY = transform.y;
this.lastZ = transform.z;
}
this.hasLastTransform = true;
}
/** Resets both previous position and previous rotation. */
resetTransform() {
const transform = this.currentTransform;
this.adapter.readTransform(transform, true);
this.setLastTransform(transform.x, transform.y, transform.z, transform.rotation);
}
/**
* Applies host object transform movement since the previous call to the skeleton's physics constraints.
*
* The first call records the current transform as the baseline and does not apply movement.
*/
applyTransformMovement() {
const inheritPosition = this.positionInheritanceFactorX !== 0 || this.positionInheritanceFactorY !== 0;
const inheritRotation = this.rotationInheritanceFactor !== 0;
if (!inheritPosition && !inheritRotation)
return;
const transform = this.currentTransform;
this.adapter.readTransform(transform, inheritRotation);
const { x, y, z } = transform;
const currentRotation = inheritRotation ? transform.rotation : this.lastRotation;
const positionChanged = x !== this.lastX || y !== this.lastY || z !== this.lastZ;
if (this.hasLastTransform) {
if (!positionChanged && currentRotation === this.lastRotation)
return;
if (inheritPosition && positionChanged)
this.applyPositionMovement(x, y, z);
if (inheritRotation && currentRotation !== this.lastRotation)
this.applyRotationMovement(currentRotation);
}
this.setLastTransform(x, y, z, currentRotation);
}
applyPositionMovement(currentX, currentY, currentZ) {
const currentPosition = this.currentPosition;
currentPosition.x = currentX;
currentPosition.y = currentY;
currentPosition.z = currentZ;
this.adapter.worldToSkeleton(currentPosition);
const lastPosition = this.lastPosition;
lastPosition.x = this.lastX;
lastPosition.y = this.lastY;
lastPosition.z = this.lastZ;
this.adapter.worldToSkeleton(lastPosition);
this.skeleton.physicsTranslate((currentPosition.x - lastPosition.x) * this.positionInheritanceFactorX, (currentPosition.y - lastPosition.y) * this.positionInheritanceFactorY);
}
applyRotationMovement(currentRotation) {
const rotationFactor = this.rotationInheritanceFactor;
if (rotationFactor === 0)
return;
this.skeleton.physicsRotate(0, 0, this.getRotationDelta(currentRotation, this.lastRotation) * rotationFactor);
}
setLastTransform(x, y, z, rotation) {
this.lastX = x;
this.lastY = y;
this.lastZ = z;
this.lastRotation = rotation;
this.hasLastTransform = true;
}
getRotationDelta(current, previous) {
let delta = current - previous;
delta = (delta + 180) % 360 - 180;
return delta < -180 ? delta + 360 : delta;
}
}
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* Spine Runtimes License Agreement\n * Last updated April 5, 2025. Replaces all prior versions.\n *\n * Copyright (c) 2013-2025, Esoteric Software LLC\n *\n * Integration of the Spine Runtimes into software or otherwise creating\n * derivative works of the Spine Runtimes is permitted under the terms and\n * conditions of Section 2 of the Spine Editor License Agreement:\n * http://esotericsoftware.com/spine-editor-license\n *\n * Otherwise, it is permitted to integrate the Spine Runtimes into software or\n * otherwise create derivative works of the Spine Runtimes (collectively,\n * \"Products\"), provided that each user of the Products must obtain their own\n * Spine Editor license and redistribution of the Products in any form must\n * include this license and copyright notice.\n *\n * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC \"AS IS\" AND ANY\n * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\n * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY\n * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,\n * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND\n * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\n * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n *****************************************************************************/\n\nimport type { Skeleton } from \"./Skeleton.js\";\n\n/** A host runtime object's world position and rotation used for skeleton physics movement inheritance. */\nexport interface SkeletonPhysicsMovementTransform {\n\t/** The host object's X position in world coordinates. */\n\tx: number;\n\n\t/** The host object's Y position in world coordinates. */\n\ty: number;\n\n\t/** The host object's Z position in world coordinates. Set to `0` in 2D runtimes. */\n\tz: number;\n\n\t/** The host object's rotation around the skeleton plane normal, in degrees and in the direction expected by Spine physics. */\n\trotation: number;\n}\n\n/** Initial movement inheritance values for {@link SkeletonPhysicsMovement}. */\nexport interface SkeletonPhysicsMovementOptions {\n\t/** Initial horizontal position inheritance. Defaults to `0`. */\n\tpositionInheritanceX?: number;\n\n\t/** Initial vertical position inheritance. Defaults to `0`. */\n\tpositionInheritanceY?: number;\n\n\t/** Initial rotation inheritance. Defaults to `0`. */\n\trotationInheritance?: number;\n}\n\n/** Runtime-specific hooks needed by {@link SkeletonPhysicsMovement}. */\nexport interface SkeletonPhysicsMovementAdapter {\n\t/**\n\t * Writes the current host object world position to `out` and, when `readRotation` is true, its rotation.\n\t * Implementations may skip calculating and writing `out.rotation` when `readRotation` is false.\n\t * @param out Receives the current host object transform.\n\t * @param readRotation Whether the current rotation is needed.\n\t */\n\treadTransform (out: SkeletonPhysicsMovementTransform, readRotation: boolean): void;\n\n\t/**\n\t * Converts `point` in-place from host world coordinates to skeleton coordinates.\n\t * The converted skeleton coordinates are returned in `point.x` and `point.y`.\n\t */\n\tworldToSkeleton (point: { x: number; y: number; z: number }): void;\n}\n\n/**\n * Tracks movement of a host runtime object and applies that movement to skeleton physics constraints.\n *\n * This is useful for runtimes where a Spine skeleton is displayed by a movable object or container.\n * When enabled, changes in the host object's position are converted to skeleton coordinates and passed to\n * {@link Skeleton.physicsTranslate}. Changes in its rotation are passed to {@link Skeleton.physicsRotate}.\n *\n * Movement inheritance is opt-in. Position and rotation inheritance default to `0`, so\n * {@link applyTransformMovement} returns immediately until one of the inheritance values is non-zero.\n */\nexport class SkeletonPhysicsMovement {\n\tprivate positionInheritanceFactorX = 0;\n\tprivate positionInheritanceFactorY = 0;\n\tprivate rotationInheritanceFactor = 0;\n\tprivate hasLastTransform = false;\n\tprivate lastX = 0;\n\tprivate lastY = 0;\n\tprivate lastZ = 0;\n\tprivate lastRotation = 0;\n\tprivate readonly currentTransform: SkeletonPhysicsMovementTransform = { x: 0, y: 0, z: 0, rotation: 0 };\n\tprivate readonly currentPosition = { x: 0, y: 0, z: 0 };\n\tprivate readonly lastPosition = { x: 0, y: 0, z: 0 };\n\n\t/**\n\t * Creates a movement tracker for a skeleton displayed by a host runtime object.\n\t * @param skeleton The skeleton whose physics constraints receive inherited movement.\n\t * @param adapter Runtime-specific hooks used to read and convert the host object's transform.\n\t * @param options Initial movement inheritance values.\n\t */\n\tconstructor (\n\t\tprivate skeleton: Skeleton,\n\t\tprivate adapter: SkeletonPhysicsMovementAdapter,\n\t\toptions: SkeletonPhysicsMovementOptions = {},\n\t) {\n\t\tthis.positionInheritanceFactorX = options.positionInheritanceX ?? 0;\n\t\tthis.positionInheritanceFactorY = options.positionInheritanceY ?? 0;\n\t\tthis.rotationInheritanceFactor = options.rotationInheritance ?? 0;\n\t}\n\n\t/** Horizontal position inheritance factor. `0` disables horizontal position inheritance. */\n\tget positionInheritanceX (): number {\n\t\treturn this.positionInheritanceFactorX;\n\t}\n\n\t/** Vertical position inheritance factor. `0` disables vertical position inheritance. */\n\tget positionInheritanceY (): number {\n\t\treturn this.positionInheritanceFactorY;\n\t}\n\n\t/**\n\t * Sets how much host object translation is inherited by skeleton physics constraints.\n\t * Use `(1, 1)` for normal inheritance, or `(0, 0)` to disable position inheritance.\n\t * @param x The horizontal position inheritance factor.\n\t * @param y The vertical position inheritance factor.\n\t */\n\tsetPositionInheritance (x: number, y: number): void {\n\t\tconst wasDisabled = this.positionInheritanceFactorX === 0 && this.positionInheritanceFactorY === 0;\n\t\tconst isEnabled = x !== 0 || y !== 0;\n\t\tthis.positionInheritanceFactorX = x;\n\t\tthis.positionInheritanceFactorY = y;\n\t\tif (wasDisabled && isEnabled) this.resetPosition();\n\t}\n\n\t/** Rotation inheritance factor. `0` disables rotation inheritance. */\n\tget rotationInheritance (): number {\n\t\treturn this.rotationInheritanceFactor;\n\t}\n\n\t/**\n\t * Sets how much host object rotation is inherited by skeleton physics constraints.\n\t * @param value The rotation inheritance factor.\n\t */\n\tset rotationInheritance (value: number) {\n\t\tconst wasDisabled = this.rotationInheritanceFactor === 0;\n\t\tthis.rotationInheritanceFactor = value;\n\t\tif (wasDisabled && value !== 0) this.resetRotation();\n\t}\n\n\t/** Resets the previous position used to calculate inherited translation. */\n\tresetPosition (): void {\n\t\tconst transform = this.currentTransform;\n\t\tconst readRotation = !this.hasLastTransform && this.rotationInheritanceFactor !== 0;\n\t\tthis.adapter.readTransform(transform, readRotation);\n\t\tthis.lastX = transform.x;\n\t\tthis.lastY = transform.y;\n\t\tthis.lastZ = transform.z;\n\t\tif (readRotation) this.lastRotation = transform.rotation;\n\t\tthis.hasLastTransform = true;\n\t}\n\n\t/** Resets the previous rotation used to calculate inherited rotation. */\n\tresetRotation (): void {\n\t\tconst transform = this.currentTransform;\n\t\tthis.adapter.readTransform(transform, true);\n\t\tthis.lastRotation = transform.rotation;\n\t\tif (!this.hasLastTransform) {\n\t\t\tthis.lastX = transform.x;\n\t\t\tthis.lastY = transform.y;\n\t\t\tthis.lastZ = transform.z;\n\t\t}\n\t\tthis.hasLastTransform = true;\n\t}\n\n\t/** Resets both previous position and previous rotation. */\n\tresetTransform (): void {\n\t\tconst transform = this.currentTransform;\n\t\tthis.adapter.readTransform(transform, true);\n\t\tthis.setLastTransform(transform.x, transform.y, transform.z, transform.rotation);\n\t}\n\n\t/**\n\t * Applies host object transform movement since the previous call to the skeleton's physics constraints.\n\t *\n\t * The first call records the current transform as the baseline and does not apply movement.\n\t */\n\tapplyTransformMovement (): void {\n\t\tconst inheritPosition = this.positionInheritanceFactorX !== 0 || this.positionInheritanceFactorY !== 0;\n\t\tconst inheritRotation = this.rotationInheritanceFactor !== 0;\n\t\tif (!inheritPosition && !inheritRotation) return;\n\n\t\tconst transform = this.currentTransform;\n\t\tthis.adapter.readTransform(transform, inheritRotation);\n\t\tconst { x, y, z } = transform;\n\t\tconst currentRotation = inheritRotation ? transform.rotation : this.lastRotation;\n\t\tconst positionChanged = x !== this.lastX || y !== this.lastY || z !== this.lastZ;\n\n\t\tif (this.hasLastTransform) {\n\t\t\tif (!positionChanged && currentRotation === this.lastRotation) return;\n\t\t\tif (inheritPosition && positionChanged) this.applyPositionMovement(x, y, z);\n\t\t\tif (inheritRotation && currentRotation !== this.lastRotation) this.applyRotationMovement(currentRotation);\n\t\t}\n\n\t\tthis.setLastTransform(x, y, z, currentRotation);\n\t}\n\n\tprivate applyPositionMovement (currentX: number, currentY: number, currentZ: number): void {\n\t\tconst currentPosition = this.currentPosition;\n\t\tcurrentPosition.x = currentX;\n\t\tcurrentPosition.y = currentY;\n\t\tcurrentPosition.z = currentZ;\n\t\tthis.adapter.worldToSkeleton(currentPosition);\n\n\t\tconst lastPosition = this.lastPosition;\n\t\tlastPosition.x = this.lastX;\n\t\tlastPosition.y = this.lastY;\n\t\tlastPosition.z = this.lastZ;\n\t\tthis.adapter.worldToSkeleton(lastPosition);\n\n\t\tthis.skeleton.physicsTranslate(\n\t\t\t(currentPosition.x - lastPosition.x) * this.positionInheritanceFactorX,\n\t\t\t(currentPosition.y - lastPosition.y) * this.positionInheritanceFactorY\n\t\t);\n\t}\n\n\tprivate applyRotationMovement (currentRotation: number): void {\n\t\tconst rotationFactor = this.rotationInheritanceFactor;\n\t\tif (rotationFactor === 0) return;\n\t\tthis.skeleton.physicsRotate(0, 0, this.getRotationDelta(currentRotation, this.lastRotation) * rotationFactor);\n\t}\n\n\tprivate setLastTransform (x: number, y: number, z: number, rotation: number): void {\n\t\tthis.lastX = x;\n\t\tthis.lastY = y;\n\t\tthis.lastZ = z;\n\t\tthis.lastRotation = rotation;\n\t\tthis.hasLastTransform = true;\n\t}\n\n\tprivate getRotationDelta (current: number, previous: number): number {\n\t\tlet delta = current - previous;\n\t\tdelta = (delta + 180) % 360 - 180;\n\t\treturn delta < -180 ? delta + 360 : delta;\n\t}\n}\n"]}