ngx-spine
Version:
[](https://travis-ci.org/PoiScript/ngx-spine)
416 lines • 43.2 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/******************************************************************************
* Spine Runtimes License Agreement
* Last updated May 1, 2019. Replaces all prior versions.
*
* Copyright (c) 2013-2019, 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.
*
* THIS SOFTWARE IS 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 THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
import { MathUtils } from "./Utils";
export class IkConstraint {
/**
* @param {?} data
* @param {?} skeleton
*/
constructor(data, skeleton) {
this.bendDirection = 0;
this.compress = false;
this.stretch = false;
this.mix = 1;
this.softness = 0;
this.active = false;
if (data == null)
throw new Error("data cannot be null.");
if (skeleton == null)
throw new Error("skeleton cannot be null.");
this.data = data;
this.mix = data.mix;
this.softness = data.softness;
this.bendDirection = data.bendDirection;
this.compress = data.compress;
this.stretch = data.stretch;
this.bones = new Array();
for (let i = 0; i < data.bones.length; i++)
this.bones.push(skeleton.findBone(data.bones[i].name));
this.target = skeleton.findBone(data.target.name);
}
/**
* @return {?}
*/
isActive() {
return this.active;
}
/**
* @return {?}
*/
apply() {
this.update();
}
/**
* @return {?}
*/
update() {
/** @type {?} */
let target = this.target;
/** @type {?} */
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.softness, this.mix);
break;
}
}
/**
* Adjusts the bone rotation so the tip is as close to the target position as possible. The target is specified in the world
* coordinate system.
* @param {?} bone
* @param {?} targetX
* @param {?} targetY
* @param {?} compress
* @param {?} stretch
* @param {?} uniform
* @param {?} alpha
* @return {?}
*/
apply1(bone, targetX, targetY, compress, stretch, uniform, alpha) {
if (!bone.appliedValid)
bone.updateAppliedTransform();
/** @type {?} */
let p = bone.parent;
/** @type {?} */
let id = 1 / (p.a * p.d - p.b * p.c);
/** @type {?} */
let x = targetX - p.worldX;
/** @type {?} */
let y = targetY - p.worldY;
/** @type {?} */
let tx = (x * p.d - y * p.b) * id - bone.ax;
/** @type {?} */
let ty = (y * p.a - x * p.c) * id - bone.ay;
/** @type {?} */
let rotationIK = Math.atan2(ty, tx) * MathUtils.radDeg - bone.ashearX - bone.arotation;
if (bone.ascaleX < 0)
rotationIK += 180;
if (rotationIK > 180)
rotationIK -= 360;
else if (rotationIK < -180)
rotationIK += 360;
/** @type {?} */
let sx = bone.ascaleX;
/** @type {?} */
let sy = bone.ascaleY;
if (compress || stretch) {
/** @type {?} */
let b = bone.data.length * sx;
/** @type {?} */
let dd = Math.sqrt(tx * tx + ty * ty);
if ((compress && dd < b) || (stretch && dd > b && b > 0.0001)) {
/** @type {?} */
let s = (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);
}
/**
* Adjusts the parent and child bone rotations so the tip of the child is as close to the target position as possible. The
* target is specified in the world coordinate system.
* @param {?} parent
* @param {?} child A direct descendant of the parent bone.
* @param {?} targetX
* @param {?} targetY
* @param {?} bendDir
* @param {?} stretch
* @param {?} softness
* @param {?} alpha
* @return {?}
*/
apply2(parent, child, targetX, targetY, bendDir, stretch, softness, alpha) {
if (alpha == 0) {
child.updateWorldTransform();
return;
}
if (!parent.appliedValid)
parent.updateAppliedTransform();
if (!child.appliedValid)
child.updateAppliedTransform();
/** @type {?} */
let px = parent.ax;
/** @type {?} */
let py = parent.ay;
/** @type {?} */
let psx = parent.ascaleX;
/** @type {?} */
let sx = psx;
/** @type {?} */
let psy = parent.ascaleY;
/** @type {?} */
let csx = child.ascaleX;
/** @type {?} */
let os1 = 0;
/** @type {?} */
let os2 = 0;
/** @type {?} */
let 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;
/** @type {?} */
let cx = child.ax;
/** @type {?} */
let cy = 0;
/** @type {?} */
let cwx = 0;
/** @type {?} */
let cwy = 0;
/** @type {?} */
let a = parent.a;
/** @type {?} */
let b = parent.b;
/** @type {?} */
let c = parent.c;
/** @type {?} */
let d = parent.d;
/** @type {?} */
let u = Math.abs(psx - psy) <= 0.0001;
if (!u) {
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;
}
/** @type {?} */
let pp = parent.parent;
a = pp.a;
b = pp.b;
c = pp.c;
d = pp.d;
/** @type {?} */
let id = 1 / (a * d - b * c);
/** @type {?} */
let x = cwx - pp.worldX;
/** @type {?} */
let y = cwy - pp.worldY;
/** @type {?} */
let dx = (x * d - y * b) * id - px;
/** @type {?} */
let dy = (y * a - x * c) * id - py;
/** @type {?} */
let l1 = Math.sqrt(dx * dx + dy * dy);
/** @type {?} */
let l2 = child.data.length * csx;
/** @type {?} */
let a1;
/** @type {?} */
let 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;
/** @type {?} */
let tx = (x * d - y * b) * id - px;
/** @type {?} */
let ty = (y * a - x * c) * id - py;
/** @type {?} */
let dd = tx * tx + ty * ty;
if (softness != 0) {
softness *= (psx * (csx + 1)) / 2;
/** @type {?} */
let td = Math.sqrt(dd);
/** @type {?} */
let sd = td - l1 - l2 * psx + softness;
if (sd > 0) {
/** @type {?} */
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;
/** @type {?} */
let cos = (dd - l1 * l1 - l2 * l2) / (2 * l1 * l2);
if (cos < -1)
cos = -1;
else if (cos > 1) {
cos = 1;
if (stretch)
sx *= (Math.sqrt(dd) / (l1 + l2) - 1) * alpha + 1;
}
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;
/** @type {?} */
let aa = a * a;
/** @type {?} */
let bb = b * b;
/** @type {?} */
let ta = Math.atan2(ty, tx);
c = bb * l1 * l1 + aa * dd - aa * bb;
/** @type {?} */
let c1 = -2 * bb * l1;
/** @type {?} */
let c2 = bb - aa;
d = c1 * c1 - 4 * c2 * c;
if (d >= 0) {
/** @type {?} */
let q = Math.sqrt(d);
if (c1 < 0)
q = -q;
q = -(c1 + q) / 2;
/** @type {?} */
let r0 = q / c2;
/** @type {?} */
let r1 = c / q;
/** @type {?} */
let r = Math.abs(r0) < Math.abs(r1) ? r0 : r1;
if (r * r <= dd) {
y = Math.sqrt(dd - r * r) * bendDir;
a1 = ta - Math.atan2(y, r);
a2 = Math.atan2(y / psy, (r - l1) / psx);
break outer;
}
}
/** @type {?} */
let minAngle = MathUtils.PI;
/** @type {?} */
let minX = l1 - a;
/** @type {?} */
let minDist = minX * minX;
/** @type {?} */
let minY = 0;
/** @type {?} */
let maxAngle = 0;
/** @type {?} */
let maxX = l1 + a;
/** @type {?} */
let maxDist = maxX * maxX;
/** @type {?} */
let 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) / 2) {
a1 = ta - Math.atan2(minY * bendDir, minX);
a2 = minAngle * bendDir;
}
else {
a1 = ta - Math.atan2(maxY * bendDir, maxX);
a2 = maxAngle * bendDir;
}
}
/** @type {?} */
let os = Math.atan2(cy, cx) * s2;
/** @type {?} */
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, parent.ascaleY, 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);
}
}
if (false) {
/** @type {?} */
IkConstraint.prototype.data;
/** @type {?} */
IkConstraint.prototype.bones;
/** @type {?} */
IkConstraint.prototype.target;
/** @type {?} */
IkConstraint.prototype.bendDirection;
/** @type {?} */
IkConstraint.prototype.compress;
/** @type {?} */
IkConstraint.prototype.stretch;
/** @type {?} */
IkConstraint.prototype.mix;
/** @type {?} */
IkConstraint.prototype.softness;
/** @type {?} */
IkConstraint.prototype.active;
}
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* Spine Runtimes License Agreement\r\n * Last updated May 1, 2019. Replaces all prior versions.\r\n *\r\n * Copyright (c) 2013-2019, Esoteric Software LLC\r\n *\r\n * Integration of the Spine Runtimes into software or otherwise creating\r\n * derivative works of the Spine Runtimes is permitted under the terms and\r\n * conditions of Section 2 of the Spine Editor License Agreement:\r\n * http://esotericsoftware.com/spine-editor-license\r\n *\r\n * Otherwise, it is permitted to integrate the Spine Runtimes into software\r\n * or otherwise create derivative works of the Spine Runtimes (collectively,\r\n * \"Products\"), provided that each user of the Products must obtain their own\r\n * Spine Editor license and redistribution of the Products in any form must\r\n * include this license and copyright notice.\r\n *\r\n * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE LLC \"AS IS\" AND ANY EXPRESS\r\n * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\r\n * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN\r\n * NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY DIRECT, INDIRECT,\r\n * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,\r\n * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS\r\n * INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY\r\n * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING\r\n * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,\r\n * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r\n *****************************************************************************/\r\n\r\nimport { MathUtils } from \"./Utils\";\r\nimport { IkConstraintData } from \"./IkConstraintData\";\r\nimport { Bone } from \"./Bone\";\r\nimport { Updatable } from \"./Updatable\";\r\nimport { Skeleton } from \"./Skeleton\";\r\n\r\nexport class IkConstraint implements Updatable {\r\n  data: IkConstraintData;\r\n  bones: Array<Bone>;\r\n  target: Bone;\r\n  bendDirection = 0;\r\n  compress = false;\r\n  stretch = false;\r\n  mix = 1;\r\n  softness = 0;\r\n  active = false;\r\n  constructor(data: IkConstraintData, skeleton: Skeleton) {\r\n    if (data == null) throw new Error(\"data cannot be null.\");\r\n    if (skeleton == null) throw new Error(\"skeleton cannot be null.\");\r\n    this.data = data;\r\n    this.mix = data.mix;\r\n    this.softness = data.softness;\r\n    this.bendDirection = data.bendDirection;\r\n    this.compress = data.compress;\r\n    this.stretch = data.stretch;\r\n    this.bones = new Array<Bone>();\r\n    for (let i = 0; i < data.bones.length; i++)\r\n      this.bones.push(skeleton.findBone(data.bones[i].name));\r\n    this.target = skeleton.findBone(data.target.name);\r\n  }\r\n  isActive() {\r\n    return this.active;\r\n  }\r\n  apply() {\r\n    this.update();\r\n  }\r\n  update() {\r\n    let target = this.target;\r\n    let bones = this.bones;\r\n    switch (bones.length) {\r\n      case 1:\r\n        this.apply1(\r\n          bones[0],\r\n          target.worldX,\r\n          target.worldY,\r\n          this.compress,\r\n          this.stretch,\r\n          this.data.uniform,\r\n          this.mix\r\n        );\r\n        break;\r\n      case 2:\r\n        this.apply2(\r\n          bones[0],\r\n          bones[1],\r\n          target.worldX,\r\n          target.worldY,\r\n          this.bendDirection,\r\n          this.stretch,\r\n          this.softness,\r\n          this.mix\r\n        );\r\n        break;\r\n    }\r\n  }\r\n  /** Adjusts the bone rotation so the tip is as close to the target position as possible. The target is specified in the world\r\n   * coordinate system. */\r\n  apply1(\r\n    bone: Bone,\r\n    targetX: number,\r\n    targetY: number,\r\n    compress: boolean,\r\n    stretch: boolean,\r\n    uniform: boolean,\r\n    alpha: number\r\n  ) {\r\n    if (!bone.appliedValid) bone.updateAppliedTransform();\r\n    let p = bone.parent;\r\n    let id = 1 / (p.a * p.d - p.b * p.c);\r\n    let x = targetX - p.worldX,\r\n      y = targetY - p.worldY;\r\n    let tx = (x * p.d - y * p.b) * id - bone.ax,\r\n      ty = (y * p.a - x * p.c) * id - bone.ay;\r\n    let rotationIK =\r\n      Math.atan2(ty, tx) * MathUtils.radDeg - bone.ashearX - bone.arotation;\r\n    if (bone.ascaleX < 0) rotationIK += 180;\r\n    if (rotationIK > 180) rotationIK -= 360;\r\n    else if (rotationIK < -180) rotationIK += 360;\r\n    let sx = bone.ascaleX,\r\n      sy = bone.ascaleY;\r\n    if (compress || stretch) {\r\n      let b = bone.data.length * sx,\r\n        dd = Math.sqrt(tx * tx + ty * ty);\r\n      if ((compress && dd < b) || (stretch && dd > b && b > 0.0001)) {\r\n        let s = (dd / b - 1) * alpha + 1;\r\n        sx *= s;\r\n        if (uniform) sy *= s;\r\n      }\r\n    }\r\n    bone.updateWorldTransformWith(\r\n      bone.ax,\r\n      bone.ay,\r\n      bone.arotation + rotationIK * alpha,\r\n      sx,\r\n      sy,\r\n      bone.ashearX,\r\n      bone.ashearY\r\n    );\r\n  }\r\n  /** Adjusts the parent and child bone rotations so the tip of the child is as close to the target position as possible. The\r\n   * target is specified in the world coordinate system.\r\n   * @param child A direct descendant of the parent bone. */\r\n  apply2(\r\n    parent: Bone,\r\n    child: Bone,\r\n    targetX: number,\r\n    targetY: number,\r\n    bendDir: number,\r\n    stretch: boolean,\r\n    softness: number,\r\n    alpha: number\r\n  ) {\r\n    if (alpha == 0) {\r\n      child.updateWorldTransform();\r\n      return;\r\n    }\r\n    if (!parent.appliedValid) parent.updateAppliedTransform();\r\n    if (!child.appliedValid) child.updateAppliedTransform();\r\n    let px = parent.ax,\r\n      py = parent.ay,\r\n      psx = parent.ascaleX,\r\n      sx = psx,\r\n      psy = parent.ascaleY,\r\n      csx = child.ascaleX;\r\n    let os1 = 0,\r\n      os2 = 0,\r\n      s2 = 0;\r\n    if (psx < 0) {\r\n      psx = -psx;\r\n      os1 = 180;\r\n      s2 = -1;\r\n    } else {\r\n      os1 = 0;\r\n      s2 = 1;\r\n    }\r\n    if (psy < 0) {\r\n      psy = -psy;\r\n      s2 = -s2;\r\n    }\r\n    if (csx < 0) {\r\n      csx = -csx;\r\n      os2 = 180;\r\n    } else os2 = 0;\r\n    let cx = child.ax,\r\n      cy = 0,\r\n      cwx = 0,\r\n      cwy = 0,\r\n      a = parent.a,\r\n      b = parent.b,\r\n      c = parent.c,\r\n      d = parent.d;\r\n    let u = Math.abs(psx - psy) <= 0.0001;\r\n    if (!u) {\r\n      cy = 0;\r\n      cwx = a * cx + parent.worldX;\r\n      cwy = c * cx + parent.worldY;\r\n    } else {\r\n      cy = child.ay;\r\n      cwx = a * cx + b * cy + parent.worldX;\r\n      cwy = c * cx + d * cy + parent.worldY;\r\n    }\r\n    let pp = parent.parent;\r\n    a = pp.a;\r\n    b = pp.b;\r\n    c = pp.c;\r\n    d = pp.d;\r\n    let id = 1 / (a * d - b * c),\r\n      x = cwx - pp.worldX,\r\n      y = cwy - pp.worldY;\r\n    let dx = (x * d - y * b) * id - px,\r\n      dy = (y * a - x * c) * id - py;\r\n    let l1 = Math.sqrt(dx * dx + dy * dy),\r\n      l2 = child.data.length * csx,\r\n      a1,\r\n      a2;\r\n    if (l1 < 0.0001) {\r\n      this.apply1(parent, targetX, targetY, false, stretch, false, alpha);\r\n      child.updateWorldTransformWith(\r\n        cx,\r\n        cy,\r\n        0,\r\n        child.ascaleX,\r\n        child.ascaleY,\r\n        child.ashearX,\r\n        child.ashearY\r\n      );\r\n      return;\r\n    }\r\n    x = targetX - pp.worldX;\r\n    y = targetY - pp.worldY;\r\n    let tx = (x * d - y * b) * id - px,\r\n      ty = (y * a - x * c) * id - py;\r\n    let dd = tx * tx + ty * ty;\r\n    if (softness != 0) {\r\n      softness *= (psx * (csx + 1)) / 2;\r\n      let td = Math.sqrt(dd),\r\n        sd = td - l1 - l2 * psx + softness;\r\n      if (sd > 0) {\r\n        let p = Math.min(1, sd / (softness * 2)) - 1;\r\n        p = (sd - softness * (1 - p * p)) / td;\r\n        tx -= p * tx;\r\n        ty -= p * ty;\r\n        dd = tx * tx + ty * ty;\r\n      }\r\n    }\r\n    outer: if (u) {\r\n      l2 *= psx;\r\n      let cos = (dd - l1 * l1 - l2 * l2) / (2 * l1 * l2);\r\n      if (cos < -1) cos = -1;\r\n      else if (cos > 1) {\r\n        cos = 1;\r\n        if (stretch) sx *= (Math.sqrt(dd) / (l1 + l2) - 1) * alpha + 1;\r\n      }\r\n      a2 = Math.acos(cos) * bendDir;\r\n      a = l1 + l2 * cos;\r\n      b = l2 * Math.sin(a2);\r\n      a1 = Math.atan2(ty * a - tx * b, tx * a + ty * b);\r\n    } else {\r\n      a = psx * l2;\r\n      b = psy * l2;\r\n      let aa = a * a,\r\n        bb = b * b,\r\n        ta = Math.atan2(ty, tx);\r\n      c = bb * l1 * l1 + aa * dd - aa * bb;\r\n      let c1 = -2 * bb * l1,\r\n        c2 = bb - aa;\r\n      d = c1 * c1 - 4 * c2 * c;\r\n      if (d >= 0) {\r\n        let q = Math.sqrt(d);\r\n        if (c1 < 0) q = -q;\r\n        q = -(c1 + q) / 2;\r\n        let r0 = q / c2,\r\n          r1 = c / q;\r\n        let r = Math.abs(r0) < Math.abs(r1) ? r0 : r1;\r\n        if (r * r <= dd) {\r\n          y = Math.sqrt(dd - r * r) * bendDir;\r\n          a1 = ta - Math.atan2(y, r);\r\n          a2 = Math.atan2(y / psy, (r - l1) / psx);\r\n          break outer;\r\n        }\r\n      }\r\n      let minAngle = MathUtils.PI,\r\n        minX = l1 - a,\r\n        minDist = minX * minX,\r\n        minY = 0;\r\n      let maxAngle = 0,\r\n        maxX = l1 + a,\r\n        maxDist = maxX * maxX,\r\n        maxY = 0;\r\n      c = (-a * l1) / (aa - bb);\r\n      if (c >= -1 && c <= 1) {\r\n        c = Math.acos(c);\r\n        x = a * Math.cos(c) + l1;\r\n        y = b * Math.sin(c);\r\n        d = x * x + y * y;\r\n        if (d < minDist) {\r\n          minAngle = c;\r\n          minDist = d;\r\n          minX = x;\r\n          minY = y;\r\n        }\r\n        if (d > maxDist) {\r\n          maxAngle = c;\r\n          maxDist = d;\r\n          maxX = x;\r\n          maxY = y;\r\n        }\r\n      }\r\n      if (dd <= (minDist + maxDist) / 2) {\r\n        a1 = ta - Math.atan2(minY * bendDir, minX);\r\n        a2 = minAngle * bendDir;\r\n      } else {\r\n        a1 = ta - Math.atan2(maxY * bendDir, maxX);\r\n        a2 = maxAngle * bendDir;\r\n      }\r\n    }\r\n    let os = Math.atan2(cy, cx) * s2;\r\n    let rotation = parent.arotation;\r\n    a1 = (a1 - os) * MathUtils.radDeg + os1 - rotation;\r\n    if (a1 > 180) a1 -= 360;\r\n    else if (a1 < -180) a1 += 360;\r\n    parent.updateWorldTransformWith(\r\n      px,\r\n      py,\r\n      rotation + a1 * alpha,\r\n      sx,\r\n      parent.ascaleY,\r\n      0,\r\n      0\r\n    );\r\n    rotation = child.arotation;\r\n    a2 = ((a2 + os) * MathUtils.radDeg - child.ashearX) * s2 + os2 - rotation;\r\n    if (a2 > 180) a2 -= 360;\r\n    else if (a2 < -180) a2 += 360;\r\n    child.updateWorldTransformWith(\r\n      cx,\r\n      cy,\r\n      rotation + a2 * alpha,\r\n      child.ascaleX,\r\n      child.ascaleY,\r\n      child.ashearX,\r\n      child.ashearY\r\n    );\r\n  }\r\n}\r\n"]}