@esotericsoftware/spine-core
Version:
The official Spine Runtimes for the web.
323 lines • 48.1 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 { Inherit } from "./BoneData.js";
import { MathUtils } from "./Utils.js";
/** Stores the current pose for an IK constraint. An IK constraint adjusts the rotation of 1 or 2 constrained bones so the tip of
* the last bone is as close to the target bone as possible.
*
* See [IK constraints](http://esotericsoftware.com/spine-ik-constraints) in the Spine User Guide. */
export class IkConstraint {
/** The IK constraint's setup pose data. */
data;
/** The bones that will be modified by this IK constraint. */
bones;
/** The bone that is the IK target. */
target;
/** Controls the bend direction of the IK bones, either 1 or -1. */
bendDirection = 0;
/** When true and only a single bone is being constrained, if the target is too close, the bone is scaled to reach it. */
compress = false;
/** When true, if the target is out of range, the parent bone is scaled to reach it. If more than one bone is being constrained
* and the parent bone has local nonuniform scale, stretch is not applied. */
stretch = false;
/** A percentage (0-1) that controls the mix between the constrained and unconstrained rotations. */
mix = 1;
/** For two bone IK, the distance from the maximum reach of the bones that rotation will slow. */
softness = 0;
active = false;
constructor(data, skeleton) {
if (!data)
throw new Error("data cannot be null.");
if (!skeleton)
throw new Error("skeleton cannot be null.");
this.data = data;
this.bones = new Array();
for (let i = 0; i < data.bones.length; i++) {
let bone = skeleton.findBone(data.bones[i].name);
if (!bone)
throw new Error(`Couldn't find bone ${data.bones[i].name}`);
this.bones.push(bone);
}
let target = skeleton.findBone(data.target.name);
if (!target)
throw new Error(`Couldn't find bone ${data.target.name}`);
this.target = target;
this.mix = data.mix;
this.softness = data.softness;
this.bendDirection = data.bendDirection;
this.compress = data.compress;
this.stretch = data.stretch;
}
isActive() {
return this.active;
}
setToSetupPose() {
const data = this.data;
this.mix = data.mix;
this.softness = data.softness;
this.bendDirection = data.bendDirection;
this.compress = data.compress;
this.stretch = data.stretch;
}
update(physics) {
if (this.mix == 0)
return;
let target = this.target;
let bones = this.bones;
switch (bones.length) {
case 1:
this.apply1(bones[0], target.worldX, target.worldY, this.compress, this.stretch, this.data.uniform, this.mix);
break;
case 2:
this.apply2(bones[0], bones[1], target.worldX, target.worldY, this.bendDirection, this.stretch, this.data.uniform, this.softness, this.mix);
break;
}
}
/** Applies 1 bone IK. The target is specified in the world coordinate system. */
apply1(bone, targetX, targetY, compress, stretch, uniform, alpha) {
let p = bone.parent;
if (!p)
throw new Error("IK bone must have parent.");
let pa = p.a, pb = p.b, pc = p.c, pd = p.d;
let rotationIK = -bone.ashearX - bone.arotation, tx = 0, ty = 0;
switch (bone.inherit) {
case Inherit.OnlyTranslation:
tx = (targetX - bone.worldX) * MathUtils.signum(bone.skeleton.scaleX);
ty = (targetY - bone.worldY) * MathUtils.signum(bone.skeleton.scaleY);
break;
case Inherit.NoRotationOrReflection:
let s = Math.abs(pa * pd - pb * pc) / Math.max(0.0001, pa * pa + pc * pc);
let sa = pa / bone.skeleton.scaleX;
let sc = pc / bone.skeleton.scaleY;
pb = -sc * s * bone.skeleton.scaleX;
pd = sa * s * bone.skeleton.scaleY;
rotationIK += Math.atan2(sc, sa) * MathUtils.radDeg;
// Fall through
default:
let x = targetX - p.worldX, y = targetY - p.worldY;
let d = pa * pd - pb * pc;
if (Math.abs(d) <= 0.0001) {
tx = 0;
ty = 0;
}
else {
tx = (x * pd - y * pb) / d - bone.ax;
ty = (y * pa - x * pc) / d - bone.ay;
}
}
rotationIK += Math.atan2(ty, tx) * MathUtils.radDeg;
if (bone.ascaleX < 0)
rotationIK += 180;
if (rotationIK > 180)
rotationIK -= 360;
else if (rotationIK < -180)
rotationIK += 360;
let sx = bone.ascaleX, sy = bone.ascaleY;
if (compress || stretch) {
switch (bone.inherit) {
case Inherit.NoScale:
case Inherit.NoScaleOrReflection:
tx = targetX - bone.worldX;
ty = targetY - bone.worldY;
}
const b = bone.data.length * sx;
if (b > 0.0001) {
const dd = tx * tx + ty * ty;
if ((compress && dd < b * b) || (stretch && dd > b * b)) {
const s = (Math.sqrt(dd) / b - 1) * alpha + 1;
sx *= s;
if (uniform)
sy *= s;
}
}
}
bone.updateWorldTransformWith(bone.ax, bone.ay, bone.arotation + rotationIK * alpha, sx, sy, bone.ashearX, bone.ashearY);
}
/** Applies 2 bone IK. The target is specified in the world coordinate system.
* @param child A direct descendant of the parent bone. */
apply2(parent, child, targetX, targetY, bendDir, stretch, uniform, softness, alpha) {
if (parent.inherit != Inherit.Normal || child.inherit != Inherit.Normal)
return;
let px = parent.ax, py = parent.ay, psx = parent.ascaleX, psy = parent.ascaleY, sx = psx, sy = psy, csx = child.ascaleX;
let os1 = 0, os2 = 0, s2 = 0;
if (psx < 0) {
psx = -psx;
os1 = 180;
s2 = -1;
}
else {
os1 = 0;
s2 = 1;
}
if (psy < 0) {
psy = -psy;
s2 = -s2;
}
if (csx < 0) {
csx = -csx;
os2 = 180;
}
else
os2 = 0;
let cx = child.ax, cy = 0, cwx = 0, cwy = 0, a = parent.a, b = parent.b, c = parent.c, d = parent.d;
let u = Math.abs(psx - psy) <= 0.0001;
if (!u || stretch) {
cy = 0;
cwx = a * cx + parent.worldX;
cwy = c * cx + parent.worldY;
}
else {
cy = child.ay;
cwx = a * cx + b * cy + parent.worldX;
cwy = c * cx + d * cy + parent.worldY;
}
let pp = parent.parent;
if (!pp)
throw new Error("IK parent must itself have a parent.");
a = pp.a;
b = pp.b;
c = pp.c;
d = pp.d;
let id = a * d - b * c, x = cwx - pp.worldX, y = cwy - pp.worldY;
id = Math.abs(id) <= 0.0001 ? 0 : 1 / id;
let dx = (x * d - y * b) * id - px, dy = (y * a - x * c) * id - py;
let l1 = Math.sqrt(dx * dx + dy * dy), l2 = child.data.length * csx, a1, a2;
if (l1 < 0.0001) {
this.apply1(parent, targetX, targetY, false, stretch, false, alpha);
child.updateWorldTransformWith(cx, cy, 0, child.ascaleX, child.ascaleY, child.ashearX, child.ashearY);
return;
}
x = targetX - pp.worldX;
y = targetY - pp.worldY;
let tx = (x * d - y * b) * id - px, ty = (y * a - x * c) * id - py;
let dd = tx * tx + ty * ty;
if (softness != 0) {
softness *= psx * (csx + 1) * 0.5;
let td = Math.sqrt(dd), sd = td - l1 - l2 * psx + softness;
if (sd > 0) {
let p = Math.min(1, sd / (softness * 2)) - 1;
p = (sd - softness * (1 - p * p)) / td;
tx -= p * tx;
ty -= p * ty;
dd = tx * tx + ty * ty;
}
}
outer: if (u) {
l2 *= psx;
let cos = (dd - l1 * l1 - l2 * l2) / (2 * l1 * l2);
if (cos < -1) {
cos = -1;
a2 = Math.PI * bendDir;
}
else if (cos > 1) {
cos = 1;
a2 = 0;
if (stretch) {
a = (Math.sqrt(dd) / (l1 + l2) - 1) * alpha + 1;
sx *= a;
if (uniform)
sy *= a;
}
}
else
a2 = Math.acos(cos) * bendDir;
a = l1 + l2 * cos;
b = l2 * Math.sin(a2);
a1 = Math.atan2(ty * a - tx * b, tx * a + ty * b);
}
else {
a = psx * l2;
b = psy * l2;
let aa = a * a, bb = b * b, ta = Math.atan2(ty, tx);
c = bb * l1 * l1 + aa * dd - aa * bb;
let c1 = -2 * bb * l1, c2 = bb - aa;
d = c1 * c1 - 4 * c2 * c;
if (d >= 0) {
let q = Math.sqrt(d);
if (c1 < 0)
q = -q;
q = -(c1 + q) * 0.5;
let r0 = q / c2, r1 = c / q;
let r = Math.abs(r0) < Math.abs(r1) ? r0 : r1;
r0 = dd - r * r;
if (r0 >= 0) {
y = Math.sqrt(r0) * bendDir;
a1 = ta - Math.atan2(y, r);
a2 = Math.atan2(y / psy, (r - l1) / psx);
break outer;
}
}
let minAngle = MathUtils.PI, minX = l1 - a, minDist = minX * minX, minY = 0;
let maxAngle = 0, maxX = l1 + a, maxDist = maxX * maxX, maxY = 0;
c = -a * l1 / (aa - bb);
if (c >= -1 && c <= 1) {
c = Math.acos(c);
x = a * Math.cos(c) + l1;
y = b * Math.sin(c);
d = x * x + y * y;
if (d < minDist) {
minAngle = c;
minDist = d;
minX = x;
minY = y;
}
if (d > maxDist) {
maxAngle = c;
maxDist = d;
maxX = x;
maxY = y;
}
}
if (dd <= (minDist + maxDist) * 0.5) {
a1 = ta - Math.atan2(minY * bendDir, minX);
a2 = minAngle * bendDir;
}
else {
a1 = ta - Math.atan2(maxY * bendDir, maxX);
a2 = maxAngle * bendDir;
}
}
let os = Math.atan2(cy, cx) * s2;
let rotation = parent.arotation;
a1 = (a1 - os) * MathUtils.radDeg + os1 - rotation;
if (a1 > 180)
a1 -= 360;
else if (a1 < -180) //
a1 += 360;
parent.updateWorldTransformWith(px, py, rotation + a1 * alpha, sx, sy, 0, 0);
rotation = child.arotation;
a2 = ((a2 + os) * MathUtils.radDeg - child.ashearX) * s2 + os2 - rotation;
if (a2 > 180)
a2 -= 360;
else if (a2 < -180) //
a2 += 360;
child.updateWorldTransformWith(cx, cy, rotation + a2 * alpha, child.ascaleX, child.ascaleY, child.ashearX, child.ashearY);
}
}
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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 { Inherit } from \"./BoneData.js\";\nimport { IkConstraintData } from \"./IkConstraintData.js\";\nimport { Physics, Skeleton } from \"./Skeleton.js\";\nimport { Updatable } from \"./Updatable.js\";\nimport { MathUtils } from \"./Utils.js\";\n\n/** Stores the current pose for an IK constraint. An IK constraint adjusts the rotation of 1 or 2 constrained bones so the tip of\n * the last bone is as close to the target bone as possible.\n *\n * See [IK constraints](http://esotericsoftware.com/spine-ik-constraints) in the Spine User Guide. */\nexport class IkConstraint implements Updatable {\n\t/** The IK constraint's setup pose data. */\n\tdata: IkConstraintData;\n\n\t/** The bones that will be modified by this IK constraint. */\n\tbones: Array<Bone>;\n\n\t/** The bone that is the IK target. */\n\ttarget: Bone;\n\n\t/** Controls the bend direction of the IK bones, either 1 or -1. */\n\tbendDirection = 0;\n\n\t/** When true and only a single bone is being constrained, if the target is too close, the bone is scaled to reach it. */\n\tcompress = false;\n\n\t/** When true, if the target is out of range, the parent bone is scaled to reach it. If more than one bone is being constrained\n\t * and the parent bone has local nonuniform scale, stretch is not applied. */\n\tstretch = false;\n\n\t/** A percentage (0-1) that controls the mix between the constrained and unconstrained rotations. */\n\tmix = 1;\n\n\t/** For two bone IK, the distance from the maximum reach of the bones that rotation will slow. */\n\tsoftness = 0;\n\tactive = false;\n\n\tconstructor (data: IkConstraintData, skeleton: Skeleton) {\n\t\tif (!data) throw new Error(\"data cannot be null.\");\n\t\tif (!skeleton) throw new Error(\"skeleton cannot be null.\");\n\t\tthis.data = data;\n\n\t\tthis.bones = new Array<Bone>();\n\t\tfor (let i = 0; i < data.bones.length; i++) {\n\t\t\tlet bone = skeleton.findBone(data.bones[i].name);\n\t\t\tif (!bone) throw new Error(`Couldn't find bone ${data.bones[i].name}`);\n\t\t\tthis.bones.push(bone);\n\t\t}\n\t\tlet target = skeleton.findBone(data.target.name);\n\t\tif (!target) throw new Error(`Couldn't find bone ${data.target.name}`);\n\n\t\tthis.target = target;\n\t\tthis.mix = data.mix;\n\t\tthis.softness = data.softness;\n\t\tthis.bendDirection = data.bendDirection;\n\t\tthis.compress = data.compress;\n\t\tthis.stretch = data.stretch;\n\t}\n\n\tisActive () {\n\t\treturn this.active;\n\t}\n\n\tsetToSetupPose () {\n\t\tconst data = this.data;\n\t\tthis.mix = data.mix;\n\t\tthis.softness = data.softness;\n\t\tthis.bendDirection = data.bendDirection;\n\t\tthis.compress = data.compress;\n\t\tthis.stretch = data.stretch;\n\t}\n\n\tupdate (physics: Physics) {\n\t\tif (this.mix == 0) return;\n\t\tlet target = this.target;\n\t\tlet bones = this.bones;\n\t\tswitch (bones.length) {\n\t\t\tcase 1:\n\t\t\t\tthis.apply1(bones[0], target.worldX, target.worldY, this.compress, this.stretch, this.data.uniform, this.mix);\n\t\t\t\tbreak;\n\t\t\tcase 2:\n\t\t\t\tthis.apply2(bones[0], bones[1], target.worldX, target.worldY, this.bendDirection, this.stretch, this.data.uniform, this.softness, this.mix);\n\t\t\t\tbreak;\n\t\t}\n\t}\n\n\t/** Applies 1 bone IK. The target is specified in the world coordinate system. */\n\tapply1 (bone: Bone, targetX: number, targetY: number, compress: boolean, stretch: boolean, uniform: boolean, alpha: number) {\n\t\tlet p = bone.parent;\n\t\tif (!p) throw new Error(\"IK bone must have parent.\");\n\t\tlet pa = p.a, pb = p.b, pc = p.c, pd = p.d;\n\t\tlet rotationIK = -bone.ashearX - bone.arotation, tx = 0, ty = 0;\n\n\t\tswitch (bone.inherit) {\n\t\t\tcase Inherit.OnlyTranslation:\n\t\t\t\ttx = (targetX - bone.worldX) * MathUtils.signum(bone.skeleton.scaleX);\n\t\t\t\tty = (targetY - bone.worldY) * MathUtils.signum(bone.skeleton.scaleY);\n\t\t\t\tbreak;\n\t\t\tcase Inherit.NoRotationOrReflection:\n\t\t\t\tlet s = Math.abs(pa * pd - pb * pc) / Math.max(0.0001, pa * pa + pc * pc);\n\t\t\t\tlet sa = pa / bone.skeleton.scaleX;\n\t\t\t\tlet sc = pc / bone.skeleton.scaleY;\n\t\t\t\tpb = -sc * s * bone.skeleton.scaleX;\n\t\t\t\tpd = sa * s * bone.skeleton.scaleY;\n\t\t\t\trotationIK += Math.atan2(sc, sa) * MathUtils.radDeg;\n\t\t\t// Fall through\n\t\t\tdefault:\n\t\t\t\tlet x = targetX - p.worldX, y = targetY - p.worldY;\n\t\t\t\tlet d = pa * pd - pb * pc;\n\t\t\t\tif (Math.abs(d) <= 0.0001) {\n\t\t\t\t\ttx = 0;\n\t\t\t\t\tty = 0;\n\t\t\t\t} else {\n\t\t\t\t\ttx = (x * pd - y * pb) / d - bone.ax;\n\t\t\t\t\tty = (y * pa - x * pc) / d - bone.ay;\n\t\t\t\t}\n\t\t}\n\t\trotationIK += Math.atan2(ty, tx) * MathUtils.radDeg;\n\t\tif (bone.ascaleX < 0) rotationIK += 180;\n\t\tif (rotationIK > 180)\n\t\t\trotationIK -= 360;\n\t\telse if (rotationIK < -180)\n\t\t\trotationIK += 360;\n\t\tlet sx = bone.ascaleX, sy = bone.ascaleY;\n\t\tif (compress || stretch) {\n\t\t\tswitch (bone.inherit) {\n\t\t\t\tcase Inherit.NoScale:\n\t\t\t\tcase Inherit.NoScaleOrReflection:\n\t\t\t\t\ttx = targetX - bone.worldX;\n\t\t\t\t\tty = targetY - bone.worldY;\n\t\t\t}\n\t\t\tconst b = bone.data.length * sx;\n\t\t\tif (b > 0.0001) {\n\t\t\t\tconst dd = tx * tx + ty * ty;\n\t\t\t\tif ((compress && dd < b * b) || (stretch && dd > b * b)) {\n\t\t\t\t\tconst s = (Math.sqrt(dd) / b - 1) * alpha + 1;\n\t\t\t\t\tsx *= s;\n\t\t\t\t\tif (uniform) sy *= s;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tbone.updateWorldTransformWith(bone.ax, bone.ay, bone.arotation + rotationIK * alpha, sx, sy, bone.ashearX,\n\t\t\tbone.ashearY);\n\t}\n\n\t/** Applies 2 bone IK. The target is specified in the world coordinate system.\n\t * @param child A direct descendant of the parent bone. */\n\tapply2 (parent: Bone, child: Bone, targetX: number, targetY: number, bendDir: number, stretch: boolean, uniform: boolean, softness: number, alpha: number) {\n\t\tif (parent.inherit != Inherit.Normal || child.inherit != Inherit.Normal) return;\n\t\tlet px = parent.ax, py = parent.ay, psx = parent.ascaleX, psy = parent.ascaleY, sx = psx, sy = psy, csx = child.ascaleX;\n\t\tlet os1 = 0, os2 = 0, s2 = 0;\n\t\tif (psx < 0) {\n\t\t\tpsx = -psx;\n\t\t\tos1 = 180;\n\t\t\ts2 = -1;\n\t\t} else {\n\t\t\tos1 = 0;\n\t\t\ts2 = 1;\n\t\t}\n\t\tif (psy < 0) {\n\t\t\tpsy = -psy;\n\t\t\ts2 = -s2;\n\t\t}\n\t\tif (csx < 0) {\n\t\t\tcsx = -csx;\n\t\t\tos2 = 180;\n\t\t} else\n\t\t\tos2 = 0;\n\t\tlet cx = child.ax, cy = 0, cwx = 0, cwy = 0, a = parent.a, b = parent.b, c = parent.c, d = parent.d;\n\t\tlet u = Math.abs(psx - psy) <= 0.0001;\n\t\tif (!u || stretch) {\n\t\t\tcy = 0;\n\t\t\tcwx = a * cx + parent.worldX;\n\t\t\tcwy = c * cx + parent.worldY;\n\t\t} else {\n\t\t\tcy = child.ay;\n\t\t\tcwx = a * cx + b * cy + parent.worldX;\n\t\t\tcwy = c * cx + d * cy + parent.worldY;\n\t\t}\n\t\tlet pp = parent.parent;\n\t\tif (!pp) throw new Error(\"IK parent must itself have a parent.\");\n\t\ta = pp.a;\n\t\tb = pp.b;\n\t\tc = pp.c;\n\t\td = pp.d;\n\t\tlet id = a * d - b * c, x = cwx - pp.worldX, y = cwy - pp.worldY;\n\t\tid = Math.abs(id) <= 0.0001 ? 0 : 1 / id;\n\t\tlet dx = (x * d - y * b) * id - px, dy = (y * a - x * c) * id - py;\n\t\tlet l1 = Math.sqrt(dx * dx + dy * dy), l2 = child.data.length * csx, a1, a2;\n\t\tif (l1 < 0.0001) {\n\t\t\tthis.apply1(parent, targetX, targetY, false, stretch, false, alpha);\n\t\t\tchild.updateWorldTransformWith(cx, cy, 0, child.ascaleX, child.ascaleY, child.ashearX, child.ashearY);\n\t\t\treturn;\n\t\t}\n\t\tx = targetX - pp.worldX;\n\t\ty = targetY - pp.worldY;\n\t\tlet tx = (x * d - y * b) * id - px, ty = (y * a - x * c) * id - py;\n\t\tlet dd = tx * tx + ty * ty;\n\t\tif (softness != 0) {\n\t\t\tsoftness *= psx * (csx + 1) * 0.5;\n\t\t\tlet td = Math.sqrt(dd), sd = td - l1 - l2 * psx + softness;\n\t\t\tif (sd > 0) {\n\t\t\t\tlet p = Math.min(1, sd / (softness * 2)) - 1;\n\t\t\t\tp = (sd - softness * (1 - p * p)) / td;\n\t\t\t\ttx -= p * tx;\n\t\t\t\tty -= p * ty;\n\t\t\t\tdd = tx * tx + ty * ty;\n\t\t\t}\n\t\t}\n\t\touter:\n\t\tif (u) {\n\t\t\tl2 *= psx;\n\t\t\tlet cos = (dd - l1 * l1 - l2 * l2) / (2 * l1 * l2);\n\t\t\tif (cos < -1) {\n\t\t\t\tcos = -1;\n\t\t\t\ta2 = Math.PI * bendDir;\n\t\t\t} else if (cos > 1) {\n\t\t\t\tcos = 1;\n\t\t\t\ta2 = 0;\n\t\t\t\tif (stretch) {\n\t\t\t\t\ta = (Math.sqrt(dd) / (l1 + l2) - 1) * alpha + 1;\n\t\t\t\t\tsx *= a;\n\t\t\t\t\tif (uniform) sy *= a;\n\t\t\t\t}\n\t\t\t} else\n\t\t\t\ta2 = Math.acos(cos) * bendDir;\n\t\t\ta = l1 + l2 * cos;\n\t\t\tb = l2 * Math.sin(a2);\n\t\t\ta1 = Math.atan2(ty * a - tx * b, tx * a + ty * b);\n\t\t} else {\n\t\t\ta = psx * l2;\n\t\t\tb = psy * l2;\n\t\t\tlet aa = a * a, bb = b * b, ta = Math.atan2(ty, tx);\n\t\t\tc = bb * l1 * l1 + aa * dd - aa * bb;\n\t\t\tlet c1 = -2 * bb * l1, c2 = bb - aa;\n\t\t\td = c1 * c1 - 4 * c2 * c;\n\t\t\tif (d >= 0) {\n\t\t\t\tlet q = Math.sqrt(d);\n\t\t\t\tif (c1 < 0) q = -q;\n\t\t\t\tq = -(c1 + q) * 0.5;\n\t\t\t\tlet r0 = q / c2, r1 = c / q;\n\t\t\t\tlet r = Math.abs(r0) < Math.abs(r1) ? r0 : r1;\n\t\t\t\tr0 = dd - r * r;\n\t\t\t\tif (r0 >= 0) {\n\t\t\t\t\ty = Math.sqrt(r0) * bendDir;\n\t\t\t\t\ta1 = ta - Math.atan2(y, r);\n\t\t\t\t\ta2 = Math.atan2(y / psy, (r - l1) / psx);\n\t\t\t\t\tbreak outer;\n\t\t\t\t}\n\t\t\t}\n\t\t\tlet minAngle = MathUtils.PI, minX = l1 - a, minDist = minX * minX, minY = 0;\n\t\t\tlet maxAngle = 0, maxX = l1 + a, maxDist = maxX * maxX, maxY = 0;\n\t\t\tc = -a * l1 / (aa - bb);\n\t\t\tif (c >= -1 && c <= 1) {\n\t\t\t\tc = Math.acos(c);\n\t\t\t\tx = a * Math.cos(c) + l1;\n\t\t\t\ty = b * Math.sin(c);\n\t\t\t\td = x * x + y * y;\n\t\t\t\tif (d < minDist) {\n\t\t\t\t\tminAngle = c;\n\t\t\t\t\tminDist = d;\n\t\t\t\t\tminX = x;\n\t\t\t\t\tminY = y;\n\t\t\t\t}\n\t\t\t\tif (d > maxDist) {\n\t\t\t\t\tmaxAngle = c;\n\t\t\t\t\tmaxDist = d;\n\t\t\t\t\tmaxX = x;\n\t\t\t\t\tmaxY = y;\n\t\t\t\t}\n\t\t\t}\n\t\t\tif (dd <= (minDist + maxDist) * 0.5) {\n\t\t\t\ta1 = ta - Math.atan2(minY * bendDir, minX);\n\t\t\t\ta2 = minAngle * bendDir;\n\t\t\t} else {\n\t\t\t\ta1 = ta - Math.atan2(maxY * bendDir, maxX);\n\t\t\t\ta2 = maxAngle * bendDir;\n\t\t\t}\n\t\t}\n\t\tlet os = Math.atan2(cy, cx) * s2;\n\t\tlet rotation = parent.arotation;\n\t\ta1 = (a1 - os) * MathUtils.radDeg + os1 - rotation;\n\t\tif (a1 > 180)\n\t\t\ta1 -= 360;\n\t\telse if (a1 < -180) //\n\t\t\ta1 += 360;\n\t\tparent.updateWorldTransformWith(px, py, rotation + a1 * alpha, sx, sy, 0, 0);\n\t\trotation = child.arotation;\n\t\ta2 = ((a2 + os) * MathUtils.radDeg - child.ashearX) * s2 + os2 - rotation;\n\t\tif (a2 > 180)\n\t\t\ta2 -= 360;\n\t\telse if (a2 < -180) //\n\t\t\ta2 += 360;\n\t\tchild.updateWorldTransformWith(cx, cy, rotation + a2 * alpha, child.ascaleX, child.ascaleY, child.ashearX, child.ashearY);\n\t}\n}\n"]}