@esotericsoftware/spine-core
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The official Spine Runtimes for the web.
298 lines • 42.8 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.
*****************************************************************************/
import { Physics, Skeleton } from "./Skeleton.js";
import { MathUtils } from "./Utils.js";
/** Stores the current pose for a physics constraint. A physics constraint applies physics to bones.
* <p>
* See <a href="http://esotericsoftware.com/spine-physics-constraints">Physics constraints</a> in the Spine User Guide. */
export class PhysicsConstraint {
data;
_bone = null;
/** The bone constrained by this physics constraint. */
set bone(bone) { this._bone = bone; }
get bone() {
if (!this._bone)
throw new Error("Bone not set.");
else
return this._bone;
}
inertia = 0;
strength = 0;
damping = 0;
massInverse = 0;
wind = 0;
gravity = 0;
mix = 0;
_reset = true;
ux = 0;
uy = 0;
cx = 0;
cy = 0;
tx = 0;
ty = 0;
xOffset = 0;
xVelocity = 0;
yOffset = 0;
yVelocity = 0;
rotateOffset = 0;
rotateVelocity = 0;
scaleOffset = 0;
scaleVelocity = 0;
active = false;
skeleton;
remaining = 0;
lastTime = 0;
constructor(data, skeleton) {
this.data = data;
this.skeleton = skeleton;
this.bone = skeleton.bones[data.bone.index];
this.inertia = data.inertia;
this.strength = data.strength;
this.damping = data.damping;
this.massInverse = data.massInverse;
this.wind = data.wind;
this.gravity = data.gravity;
this.mix = data.mix;
}
reset() {
this.remaining = 0;
this.lastTime = this.skeleton.time;
this._reset = true;
this.xOffset = 0;
this.xVelocity = 0;
this.yOffset = 0;
this.yVelocity = 0;
this.rotateOffset = 0;
this.rotateVelocity = 0;
this.scaleOffset = 0;
this.scaleVelocity = 0;
}
setToSetupPose() {
const data = this.data;
this.inertia = data.inertia;
this.strength = data.strength;
this.damping = data.damping;
this.massInverse = data.massInverse;
this.wind = data.wind;
this.gravity = data.gravity;
this.mix = data.mix;
}
isActive() {
return this.active;
}
/** Applies the constraint to the constrained bones. */
update(physics) {
const mix = this.mix;
if (mix == 0)
return;
const x = this.data.x > 0, y = this.data.y > 0, rotateOrShearX = this.data.rotate > 0 || this.data.shearX > 0, scaleX = this.data.scaleX > 0;
const bone = this.bone;
const l = bone.data.length;
switch (physics) {
case Physics.none:
return;
case Physics.reset:
this.reset();
// Fall through.
case Physics.update:
const skeleton = this.skeleton;
const delta = Math.max(this.skeleton.time - this.lastTime, 0);
this.remaining += delta;
this.lastTime = skeleton.time;
const bx = bone.worldX, by = bone.worldY;
if (this._reset) {
this._reset = false;
this.ux = bx;
this.uy = by;
}
else {
let a = this.remaining, i = this.inertia, t = this.data.step, f = this.skeleton.data.referenceScale, d = -1;
let qx = this.data.limit * delta, qy = qx * Math.abs(skeleton.scaleY);
qx *= Math.abs(skeleton.scaleX);
if (x || y) {
if (x) {
const u = (this.ux - bx) * i;
this.xOffset += u > qx ? qx : u < -qx ? -qx : u;
this.ux = bx;
}
if (y) {
const u = (this.uy - by) * i;
this.yOffset += u > qy ? qy : u < -qy ? -qy : u;
this.uy = by;
}
if (a >= t) {
d = Math.pow(this.damping, 60 * t);
const m = this.massInverse * t, e = this.strength, w = this.wind * f * skeleton.scaleX, g = this.gravity * f * skeleton.scaleY;
do {
if (x) {
this.xVelocity += (w - this.xOffset * e) * m;
this.xOffset += this.xVelocity * t;
this.xVelocity *= d;
}
if (y) {
this.yVelocity -= (g + this.yOffset * e) * m;
this.yOffset += this.yVelocity * t;
this.yVelocity *= d;
}
a -= t;
} while (a >= t);
}
if (x)
bone.worldX += this.xOffset * mix * this.data.x;
if (y)
bone.worldY += this.yOffset * mix * this.data.y;
}
if (rotateOrShearX || scaleX) {
let ca = Math.atan2(bone.c, bone.a), c = 0, s = 0, mr = 0;
let dx = this.cx - bone.worldX, dy = this.cy - bone.worldY;
if (dx > qx)
dx = qx;
else if (dx < -qx) //
dx = -qx;
if (dy > qy)
dy = qy;
else if (dy < -qy) //
dy = -qy;
if (rotateOrShearX) {
mr = (this.data.rotate + this.data.shearX) * mix;
let r = Math.atan2(dy + this.ty, dx + this.tx) - ca - this.rotateOffset * mr;
this.rotateOffset += (r - Math.ceil(r * MathUtils.invPI2 - 0.5) * MathUtils.PI2) * i;
r = this.rotateOffset * mr + ca;
c = Math.cos(r);
s = Math.sin(r);
if (scaleX) {
r = l * bone.getWorldScaleX();
if (r > 0)
this.scaleOffset += (dx * c + dy * s) * i / r;
}
}
else {
c = Math.cos(ca);
s = Math.sin(ca);
const r = l * bone.getWorldScaleX();
if (r > 0)
this.scaleOffset += (dx * c + dy * s) * i / r;
}
a = this.remaining;
if (a >= t) {
if (d == -1)
d = Math.pow(this.damping, 60 * t);
const m = this.massInverse * t, e = this.strength, w = this.wind, g = (Skeleton.yDown ? -this.gravity : this.gravity), h = l / f;
while (true) {
a -= t;
if (scaleX) {
this.scaleVelocity += (w * c - g * s - this.scaleOffset * e) * m;
this.scaleOffset += this.scaleVelocity * t;
this.scaleVelocity *= d;
}
if (rotateOrShearX) {
this.rotateVelocity -= ((w * s + g * c) * h + this.rotateOffset * e) * m;
this.rotateOffset += this.rotateVelocity * t;
this.rotateVelocity *= d;
if (a < t)
break;
const r = this.rotateOffset * mr + ca;
c = Math.cos(r);
s = Math.sin(r);
}
else if (a < t) //
break;
}
}
}
this.remaining = a;
}
this.cx = bone.worldX;
this.cy = bone.worldY;
break;
case Physics.pose:
if (x)
bone.worldX += this.xOffset * mix * this.data.x;
if (y)
bone.worldY += this.yOffset * mix * this.data.y;
}
if (rotateOrShearX) {
let o = this.rotateOffset * mix, s = 0, c = 0, a = 0;
if (this.data.shearX > 0) {
let r = 0;
if (this.data.rotate > 0) {
r = o * this.data.rotate;
s = Math.sin(r);
c = Math.cos(r);
a = bone.b;
bone.b = c * a - s * bone.d;
bone.d = s * a + c * bone.d;
}
r += o * this.data.shearX;
s = Math.sin(r);
c = Math.cos(r);
a = bone.a;
bone.a = c * a - s * bone.c;
bone.c = s * a + c * bone.c;
}
else {
o *= this.data.rotate;
s = Math.sin(o);
c = Math.cos(o);
a = bone.a;
bone.a = c * a - s * bone.c;
bone.c = s * a + c * bone.c;
a = bone.b;
bone.b = c * a - s * bone.d;
bone.d = s * a + c * bone.d;
}
}
if (scaleX) {
const s = 1 + this.scaleOffset * mix * this.data.scaleX;
bone.a *= s;
bone.c *= s;
}
if (physics != Physics.pose) {
this.tx = l * bone.a;
this.ty = l * bone.c;
}
bone.updateAppliedTransform();
}
/** Translates the physics constraint so next {@link #update(Physics)} forces are applied as if the bone moved an additional
* amount in world space. */
translate(x, y) {
this.ux -= x;
this.uy -= y;
this.cx -= x;
this.cy -= y;
}
/** Rotates the physics constraint so next {@link #update(Physics)} forces are applied as if the bone rotated around the
* specified point in world space. */
rotate(x, y, degrees) {
const r = degrees * MathUtils.degRad, cos = Math.cos(r), sin = Math.sin(r);
const dx = this.cx - x, dy = this.cy - y;
this.translate(dx * cos - dy * sin - dx, dx * sin + dy * cos - dy);
}
}
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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\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 { Bone } from \"./Bone.js\";\nimport { PhysicsConstraintData } from \"./PhysicsConstraintData.js\";\nimport { Physics, Skeleton } from \"./Skeleton.js\";\nimport { Updatable } from \"./Updatable.js\";\nimport { MathUtils } from \"./Utils.js\";\n\n\n/** Stores the current pose for a physics constraint. A physics constraint applies physics to bones.\n * <p>\n * See <a href=\"http://esotericsoftware.com/spine-physics-constraints\">Physics constraints</a> in the Spine User Guide. */\nexport class PhysicsConstraint implements Updatable {\n\treadonly data: PhysicsConstraintData;\n\tprivate _bone: Bone | null = null;\n\t/** The bone constrained by this physics constraint. */\n\tpublic set bone (bone: Bone) { this._bone = bone; }\n\tpublic get bone () {\n\t\tif (!this._bone) throw new Error(\"Bone not set.\")\n\t\telse return this._bone;\n\t}\n\tinertia = 0;\n\tstrength = 0;\n\tdamping = 0;\n\tmassInverse = 0;\n\twind = 0;\n\tgravity = 0;\n\tmix = 0;\n\n\t_reset = true;\n\tux = 0;\n\tuy = 0;\n\tcx = 0;\n\tcy = 0;\n\ttx = 0;\n\tty = 0;\n\txOffset = 0;\n\txVelocity = 0;\n\tyOffset = 0;\n\tyVelocity = 0;\n\trotateOffset = 0;\n\trotateVelocity = 0;\n\tscaleOffset = 0\n\tscaleVelocity = 0;\n\n\tactive = false;\n\n\treadonly skeleton: Skeleton;\n\tremaining = 0;\n\tlastTime = 0;\n\n\tconstructor (data: PhysicsConstraintData, skeleton: Skeleton) {\n\t\tthis.data = data;\n\t\tthis.skeleton = skeleton;\n\n\t\tthis.bone = skeleton.bones[data.bone.index];\n\n\t\tthis.inertia = data.inertia;\n\t\tthis.strength = data.strength;\n\t\tthis.damping = data.damping;\n\t\tthis.massInverse = data.massInverse;\n\t\tthis.wind = data.wind;\n\t\tthis.gravity = data.gravity;\n\t\tthis.mix = data.mix;\n\t}\n\n\treset () {\n\t\tthis.remaining = 0;\n\t\tthis.lastTime = this.skeleton.time;\n\t\tthis._reset = true;\n\t\tthis.xOffset = 0;\n\t\tthis.xVelocity = 0;\n\t\tthis.yOffset = 0;\n\t\tthis.yVelocity = 0;\n\t\tthis.rotateOffset = 0;\n\t\tthis.rotateVelocity = 0;\n\t\tthis.scaleOffset = 0;\n\t\tthis.scaleVelocity = 0;\n\t}\n\n\tsetToSetupPose () {\n\t\tconst data = this.data;\n\t\tthis.inertia = data.inertia;\n\t\tthis.strength = data.strength;\n\t\tthis.damping = data.damping;\n\t\tthis.massInverse = data.massInverse;\n\t\tthis.wind = data.wind;\n\t\tthis.gravity = data.gravity;\n\t\tthis.mix = data.mix;\n\t}\n\n\tisActive () {\n\t\treturn this.active;\n\t}\n\n\t/** Applies the constraint to the constrained bones. */\n\tupdate (physics: Physics) {\n\t\tconst mix = this.mix;\n\t\tif (mix == 0) return;\n\n\t\tconst x = this.data.x > 0, y = this.data.y > 0, rotateOrShearX = this.data.rotate > 0 || this.data.shearX > 0, scaleX = this.data.scaleX > 0;\n\t\tconst bone = this.bone;\n\t\tconst l = bone.data.length;\n\n\t\tswitch (physics) {\n\t\t\tcase Physics.none:\n\t\t\t\treturn;\n\t\t\tcase Physics.reset:\n\t\t\t\tthis.reset();\n\t\t\t// Fall through.\n\t\t\tcase Physics.update:\n\t\t\t\tconst skeleton = this.skeleton;\n\t\t\t\tconst delta = Math.max(this.skeleton.time - this.lastTime, 0);\n\t\t\t\tthis.remaining += delta;\n\t\t\t\tthis.lastTime = skeleton.time;\n\n\t\t\t\tconst bx = bone.worldX, by = bone.worldY;\n\t\t\t\tif (this._reset) {\n\t\t\t\t\tthis._reset = false;\n\t\t\t\t\tthis.ux = bx;\n\t\t\t\t\tthis.uy = by;\n\t\t\t\t} else {\n\t\t\t\t\tlet a = this.remaining, i = this.inertia, t = this.data.step, f = this.skeleton.data.referenceScale, d = -1;\n\t\t\t\t\tlet qx = this.data.limit * delta, qy = qx * Math.abs(skeleton.scaleY);\n\t\t\t\t\tqx *= Math.abs(skeleton.scaleX);\n\t\t\t\t\tif (x || y) {\n\t\t\t\t\t\tif (x) {\n\t\t\t\t\t\t\tconst u = (this.ux - bx) * i;\n\t\t\t\t\t\t\tthis.xOffset += u > qx ? qx : u < -qx ? -qx : u;\n\t\t\t\t\t\t\tthis.ux = bx;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif (y) {\n\t\t\t\t\t\t\tconst u = (this.uy - by) * i;\n\t\t\t\t\t\t\tthis.yOffset += u > qy ? qy : u < -qy ? -qy : u;\n\t\t\t\t\t\t\tthis.uy = by;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif (a >= t) {\n\t\t\t\t\t\t\td = Math.pow(this.damping, 60 * t);\n\t\t\t\t\t\t\tconst m = this.massInverse * t, e = this.strength, w = this.wind * f * skeleton.scaleX, g = this.gravity * f * skeleton.scaleY;\n\t\t\t\t\t\t\tdo {\n\t\t\t\t\t\t\t\tif (x) {\n\t\t\t\t\t\t\t\t\tthis.xVelocity += (w - this.xOffset * e) * m;\n\t\t\t\t\t\t\t\t\tthis.xOffset += this.xVelocity * t;\n\t\t\t\t\t\t\t\t\tthis.xVelocity *= d;\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\tif (y) {\n\t\t\t\t\t\t\t\t\tthis.yVelocity -= (g + this.yOffset * e) * m;\n\t\t\t\t\t\t\t\t\tthis.yOffset += this.yVelocity * t;\n\t\t\t\t\t\t\t\t\tthis.yVelocity *= d;\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\ta -= t;\n\t\t\t\t\t\t\t} while (a >= t);\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif (x) bone.worldX += this.xOffset * mix * this.data.x;\n\t\t\t\t\t\tif (y) bone.worldY += this.yOffset * mix * this.data.y;\n\t\t\t\t\t}\n\t\t\t\t\tif (rotateOrShearX || scaleX) {\n\t\t\t\t\t\tlet ca = Math.atan2(bone.c, bone.a), c = 0, s = 0, mr = 0;\n\t\t\t\t\t\tlet dx = this.cx - bone.worldX, dy = this.cy - bone.worldY;\n\t\t\t\t\t\tif (dx > qx)\n\t\t\t\t\t\t\tdx = qx;\n\t\t\t\t\t\telse if (dx < -qx) //\n\t\t\t\t\t\t\tdx = -qx;\n\t\t\t\t\t\tif (dy > qy)\n\t\t\t\t\t\t\tdy = qy;\n\t\t\t\t\t\telse if (dy < -qy) //\n\t\t\t\t\t\t\tdy = -qy;\n\t\t\t\t\t\tif (rotateOrShearX) {\n\t\t\t\t\t\t\tmr = (this.data.rotate + this.data.shearX) * mix;\n\t\t\t\t\t\t\tlet r = Math.atan2(dy + this.ty, dx + this.tx) - ca - this.rotateOffset * mr;\n\t\t\t\t\t\t\tthis.rotateOffset += (r - Math.ceil(r * MathUtils.invPI2 - 0.5) * MathUtils.PI2) * i;\n\t\t\t\t\t\t\tr = this.rotateOffset * mr + ca;\n\t\t\t\t\t\t\tc = Math.cos(r);\n\t\t\t\t\t\t\ts = Math.sin(r);\n\t\t\t\t\t\t\tif (scaleX) {\n\t\t\t\t\t\t\t\tr = l * bone.getWorldScaleX();\n\t\t\t\t\t\t\t\tif (r > 0) this.scaleOffset += (dx * c + dy * s) * i / r;\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tc = Math.cos(ca);\n\t\t\t\t\t\t\ts = Math.sin(ca);\n\t\t\t\t\t\t\tconst r = l * bone.getWorldScaleX();\n\t\t\t\t\t\t\tif (r > 0) this.scaleOffset += (dx * c + dy * s) * i / r;\n\t\t\t\t\t\t}\n\t\t\t\t\t\ta = this.remaining;\n\t\t\t\t\t\tif (a >= t) {\n\t\t\t\t\t\t\tif (d == -1) d = Math.pow(this.damping, 60 * t);\n\t\t\t\t\t\t\tconst m = this.massInverse * t, e = this.strength, w = this.wind, g = (Skeleton.yDown ? -this.gravity : this.gravity), h = l / f;\n\t\t\t\t\t\t\twhile (true) {\n\t\t\t\t\t\t\t\ta -= t;\n\t\t\t\t\t\t\t\tif (scaleX) {\n\t\t\t\t\t\t\t\t\tthis.scaleVelocity += (w * c - g * s - this.scaleOffset * e) * m;\n\t\t\t\t\t\t\t\t\tthis.scaleOffset += this.scaleVelocity * t;\n\t\t\t\t\t\t\t\t\tthis.scaleVelocity *= d;\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\tif (rotateOrShearX) {\n\t\t\t\t\t\t\t\t\tthis.rotateVelocity -= ((w * s + g * c) * h + this.rotateOffset * e) * m;\n\t\t\t\t\t\t\t\t\tthis.rotateOffset += this.rotateVelocity * t;\n\t\t\t\t\t\t\t\t\tthis.rotateVelocity *= d;\n\t\t\t\t\t\t\t\t\tif (a < t) break;\n\t\t\t\t\t\t\t\t\tconst r = this.rotateOffset * mr + ca;\n\t\t\t\t\t\t\t\t\tc = Math.cos(r);\n\t\t\t\t\t\t\t\t\ts = Math.sin(r);\n\t\t\t\t\t\t\t\t} else if (a < t) //\n\t\t\t\t\t\t\t\t\tbreak;\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\tthis.remaining = a;\n\t\t\t\t}\n\t\t\t\tthis.cx = bone.worldX;\n\t\t\t\tthis.cy = bone.worldY;\n\t\t\t\tbreak;\n\t\t\tcase Physics.pose:\n\t\t\t\tif (x) bone.worldX += this.xOffset * mix * this.data.x;\n\t\t\t\tif (y) bone.worldY += this.yOffset * mix * this.data.y;\n\t\t}\n\n\t\tif (rotateOrShearX) {\n\t\t\tlet o = this.rotateOffset * mix, s = 0, c = 0, a = 0;\n\t\t\tif (this.data.shearX > 0) {\n\t\t\t\tlet r = 0;\n\t\t\t\tif (this.data.rotate > 0) {\n\t\t\t\t\tr = o * this.data.rotate;\n\t\t\t\t\ts = Math.sin(r);\n\t\t\t\t\tc = Math.cos(r);\n\t\t\t\t\ta = bone.b;\n\t\t\t\t\tbone.b = c * a - s * bone.d;\n\t\t\t\t\tbone.d = s * a + c * bone.d;\n\t\t\t\t}\n\t\t\t\tr += o * this.data.shearX;\n\t\t\t\ts = Math.sin(r);\n\t\t\t\tc = Math.cos(r);\n\t\t\t\ta = bone.a;\n\t\t\t\tbone.a = c * a - s * bone.c;\n\t\t\t\tbone.c = s * a + c * bone.c;\n\t\t\t} else {\n\t\t\t\to *= this.data.rotate;\n\t\t\t\ts = Math.sin(o);\n\t\t\t\tc = Math.cos(o);\n\t\t\t\ta = bone.a;\n\t\t\t\tbone.a = c * a - s * bone.c;\n\t\t\t\tbone.c = s * a + c * bone.c;\n\t\t\t\ta = bone.b;\n\t\t\t\tbone.b = c * a - s * bone.d;\n\t\t\t\tbone.d = s * a + c * bone.d;\n\t\t\t}\n\t\t}\n\t\tif (scaleX) {\n\t\t\tconst s = 1 + this.scaleOffset * mix * this.data.scaleX;\n\t\t\tbone.a *= s;\n\t\t\tbone.c *= s;\n\t\t}\n\t\tif (physics != Physics.pose) {\n\t\t\tthis.tx = l * bone.a;\n\t\t\tthis.ty = l * bone.c;\n\t\t}\n\t\tbone.updateAppliedTransform();\n\t}\n\n\t/** Translates the physics constraint so next {@link #update(Physics)} forces are applied as if the bone moved an additional\n\t * amount in world space. */\n\ttranslate (x: number, y: number) {\n\t\tthis.ux -= x;\n\t\tthis.uy -= y;\n\t\tthis.cx -= x;\n\t\tthis.cy -= y;\n\t}\n\n\t/** Rotates the physics constraint so next {@link #update(Physics)} forces are applied as if the bone rotated around the\n\t * specified point in world space. */\n\trotate (x: number, y: number, degrees: number) {\n\t\tconst r = degrees * MathUtils.degRad, cos = Math.cos(r), sin = Math.sin(r);\n\t\tconst dx = this.cx - x, dy = this.cy - y;\n\t\tthis.translate(dx * cos - dy * sin - dx, dx * sin + dy * cos - dy);\n\t}\n}\n"]}