@esotericsoftware/spine-core
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The official Spine Runtimes for the web.
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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.
*****************************************************************************/
import { Constraint } from "./Constraint.js";
import { TransformConstraintPose } from "./TransformConstraintPose.js";
import { MathUtils } from "./Utils.js";
/** Adjusts the world transform of the constrained bones to match that of the source bone.
*
* See [Transform constraints](http://esotericsoftware.com/spine-transform-constraints) in the Spine User Guide. */
export class TransformConstraint extends Constraint {
/** The bones that will be modified by this transform constraint. */
bones;
/** The bone whose world transform will be copied to the constrained bones. */
source;
constructor(data, skeleton) {
super(data, new TransformConstraintPose(), new TransformConstraintPose());
if (!skeleton)
throw new Error("skeleton cannot be null.");
this.bones = [];
for (const boneData of data.bones)
this.bones.push(skeleton.bones[boneData.index].constrainedPose);
const source = skeleton.bones[data.source.index];
if (source == null)
throw new Error("source cannot be null.");
this.source = source;
}
copy(skeleton) {
var copy = new TransformConstraint(this.data, skeleton);
copy.pose.set(this.pose);
return copy;
}
update(skeleton, physics) {
const p = this.appliedPose;
if (p.mixRotate === 0 && p.mixX === 0 && p.mixY === 0 && p.mixScaleX === 0 && p.mixScaleY === 0 && p.mixShearY === 0)
return;
const data = this.data;
const localSource = data.localSource, localTarget = data.localTarget, additive = data.additive, clamp = data.clamp;
const offsets = data.offsets;
const source = this.source.appliedPose;
if (localSource)
source.validateLocalTransform(skeleton);
const fromItems = data.properties;
const fn = data.properties.length, update = skeleton._update;
const bones = this.bones;
for (let i = 0, n = this.bones.length; i < n; i++) {
const bone = bones[i];
if (localTarget)
bone.modifyLocal(skeleton);
else
bone.modifyWorld(update);
for (let f = 0; f < fn; f++) {
const from = fromItems[f];
const value = from.value(skeleton, source, localSource, offsets) - from.offset;
const toItems = from.to;
for (let t = 0, tn = from.to.length; t < tn; t++) {
const to = toItems[t];
if (to.mix(p) !== 0) {
let clamped = to.offset + value * to.scale;
if (clamp) {
if (to.offset < to.max)
clamped = MathUtils.clamp(clamped, to.offset, to.max);
else
clamped = MathUtils.clamp(clamped, to.max, to.offset);
}
to.apply(skeleton, p, bone, clamped, localTarget, additive);
}
}
}
}
}
sort(skeleton) {
if (!this.data.localSource)
skeleton.sortBone(this.source);
const bones = this.bones;
const boneCount = this.bones.length;
const worldTarget = !this.data.localTarget;
if (worldTarget) {
for (let i = 0; i < boneCount; i++)
skeleton.sortBone(bones[i].bone);
}
skeleton._updateCache.push(this);
for (let i = 0; i < boneCount; i++) {
const bone = bones[i].bone;
skeleton.sortReset(bone.children);
skeleton.constrained(bone);
}
for (let i = 0; i < boneCount; i++)
bones[i].bone.sorted = worldTarget;
}
isSourceActive() {
return this.source.active;
}
}
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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\n * or 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 { Bone } from \"./Bone.js\";\nimport type { BonePose } from \"./BonePose.js\";\nimport { Constraint } from \"./Constraint.js\";\nimport type { Physics } from \"./Physics.js\";\nimport type { Skeleton } from \"./Skeleton.js\";\nimport type { TransformConstraintData } from \"./TransformConstraintData.js\";\nimport { TransformConstraintPose } from \"./TransformConstraintPose.js\";\nimport { MathUtils } from \"./Utils.js\";\n\n\n/** Adjusts the world transform of the constrained bones to match that of the source bone.\n *\n * See [Transform constraints](http://esotericsoftware.com/spine-transform-constraints) in the Spine User Guide. */\nexport class TransformConstraint extends Constraint<TransformConstraint, TransformConstraintData, TransformConstraintPose> {\n\n\t/** The bones that will be modified by this transform constraint. */\n\tbones: Array<BonePose>;\n\n\t/** The bone whose world transform will be copied to the constrained bones. */\n\tsource: Bone;\n\n\tconstructor (data: TransformConstraintData, skeleton: Skeleton) {\n\t\tsuper(data, new TransformConstraintPose(), new TransformConstraintPose());\n\t\tif (!skeleton) throw new Error(\"skeleton cannot be null.\");\n\n\t\tthis.bones = [] as BonePose[];\n\t\tfor (const boneData of data.bones)\n\t\t\tthis.bones.push(skeleton.bones[boneData.index].constrainedPose);\n\n\t\tconst source = skeleton.bones[data.source.index];\n\t\tif (source == null) throw new Error(\"source cannot be null.\");\n\t\tthis.source = source;\n\t}\n\n\tpublic copy (skeleton: Skeleton) {\n\t\tvar copy = new TransformConstraint(this.data, skeleton);\n\t\tcopy.pose.set(this.pose);\n\t\treturn copy;\n\t}\n\n\tupdate (skeleton: Skeleton, physics: Physics) {\n\t\tconst p = this.appliedPose;\n\t\tif (p.mixRotate === 0 && p.mixX === 0 && p.mixY === 0 && p.mixScaleX === 0 && p.mixScaleY === 0 && p.mixShearY === 0) return;\n\n\t\tconst data = this.data;\n\t\tconst localSource = data.localSource, localTarget = data.localTarget, additive = data.additive, clamp = data.clamp;\n\t\tconst offsets = data.offsets;\n\t\tconst source = this.source.appliedPose;\n\t\tif (localSource) source.validateLocalTransform(skeleton);\n\t\tconst fromItems = data.properties;\n\t\tconst fn = data.properties.length, update = skeleton._update;\n\t\tconst bones = this.bones;\n\t\tfor (let i = 0, n = this.bones.length; i < n; i++) {\n\t\t\tconst bone = bones[i];\n\t\t\tif (localTarget)\n\t\t\t\tbone.modifyLocal(skeleton);\n\t\t\telse\n\t\t\t\tbone.modifyWorld(update);\n\t\t\tfor (let f = 0; f < fn; f++) {\n\t\t\t\tconst from = fromItems[f];\n\t\t\t\tconst value = from.value(skeleton, source, localSource, offsets) - from.offset;\n\t\t\t\tconst toItems = from.to;\n\t\t\t\tfor (let t = 0, tn = from.to.length; t < tn; t++) {\n\t\t\t\t\tconst to = toItems[t];\n\t\t\t\t\tif (to.mix(p) !== 0) {\n\t\t\t\t\t\tlet clamped = to.offset + value * to.scale;\n\t\t\t\t\t\tif (clamp) {\n\t\t\t\t\t\t\tif (to.offset < to.max)\n\t\t\t\t\t\t\t\tclamped = MathUtils.clamp(clamped, to.offset, to.max);\n\t\t\t\t\t\t\telse\n\t\t\t\t\t\t\t\tclamped = MathUtils.clamp(clamped, to.max, to.offset);\n\t\t\t\t\t\t}\n\t\t\t\t\t\tto.apply(skeleton, p, bone, clamped, localTarget, additive);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tsort (skeleton: Skeleton) {\n\t\tif (!this.data.localSource) skeleton.sortBone(this.source);\n\t\tconst bones = this.bones;\n\t\tconst boneCount = this.bones.length;\n\t\tconst worldTarget = !this.data.localTarget;\n\t\tif (worldTarget) {\n\t\t\tfor (let i = 0; i < boneCount; i++)\n\t\t\t\tskeleton.sortBone(bones[i].bone);\n\t\t}\n\t\tskeleton._updateCache.push(this);\n\t\tfor (let i = 0; i < boneCount; i++) {\n\t\t\tconst bone = bones[i].bone;\n\t\t\tskeleton.sortReset(bone.children);\n\t\t\tskeleton.constrained(bone);\n\t\t}\n\t\tfor (let i = 0; i < boneCount; i++)\n\t\t\tbones[i].bone.sorted = worldTarget;\n\t}\n\n\tisSourceActive () {\n\t\treturn this.source.active;\n\t}\n\n}\n"]}