mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
synced 2026-02-04 22:34:53 +08:00
284 lines
8.5 KiB
C++
284 lines
8.5 KiB
C++
/******************************************************************************
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* Spine Runtimes Software License v2.5
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*
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* Copyright (c) 2013-2016, Esoteric Software
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* All rights reserved.
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*
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* You are granted a perpetual, non-exclusive, non-sublicensable, and
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* non-transferable license to use, install, execute, and perform the Spine
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* Runtimes software and derivative works solely for personal or internal
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* use. Without the written permission of Esoteric Software (see Section 2 of
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* the Spine Software License Agreement), you may not (a) modify, translate,
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* adapt, or develop new applications using the Spine Runtimes or otherwise
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* create derivative works or improvements of the Spine Runtimes or (b) remove,
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* delete, alter, or obscure any trademarks or any copyright, trademark, patent,
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* or other intellectual property or proprietary rights notices on or in the
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* Software, including any copy thereof. Redistributions in binary or source
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* form must include this license and terms.
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*
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* THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS INTERRUPTION, OR LOSS OF
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* USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#ifdef SPINE_UE4
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#include "SpinePluginPrivatePCH.h"
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#endif
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#include <spine/IkConstraint.h>
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#include <spine/IkConstraintData.h>
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#include <spine/Skeleton.h>
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#include <spine/Bone.h>
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#include <spine/BoneData.h>
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using namespace spine;
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RTTI_IMPL(IkConstraint, Constraint)
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void IkConstraint::apply(Bone &bone, float targetX, float targetY, bool stretch, float alpha) {
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Bone *p = bone.getParent();
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float id, x, y, tx, ty, rotationIK;
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if (!bone._appliedValid) bone.updateAppliedTransform();
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id = 1 / (p->_a * p->_d - p->_b * p->_c);
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x = targetX - p->_worldX, y = targetY - p->_worldY;
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tx = (x * p->_d - y * p->_b) * id - bone._ax;
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ty = (y * p->_a - x * p->_c) * id - bone._ay;
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rotationIK = MathUtil::atan2(ty, tx) * MathUtil::Rad_Deg - bone._ashearX - bone._arotation;
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if (bone._ascaleX < 0) rotationIK += 180;
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if (rotationIK > 180) rotationIK -= 360;
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else if (rotationIK < -180) rotationIK += 360;
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float sx = bone._ascaleX;
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if (stretch) {
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float b = bone._data.getLength() * sx, dd = MathUtil::sqrt(tx * tx + ty * ty);
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if (dd > b && b > 0.0001f) sx *= (dd / b - 1) * alpha + 1;
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}
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bone.updateWorldTransform(bone._ax, bone._ay, bone._arotation + rotationIK * alpha, sx,
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bone._ascaleY, bone._ashearX, bone._ashearY);
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}
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void IkConstraint::apply(Bone &parent, Bone &child, float targetX, float targetY, int bendDir, bool stretch, float alpha) {
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float px, py, psx, sx, psy;
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float cx, cy, csx, cwx, cwy;
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int o1, o2, s2, u;
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Bone *pp = parent.getParent();
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float tx, ty, dx, dy, dd, l1, l2, a1, a2, r;
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float id, x, y;
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if (alpha == 0) {
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child.updateWorldTransform();
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return;
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}
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if (!parent._appliedValid) parent.updateAppliedTransform();
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if (!child._appliedValid) child.updateAppliedTransform();
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px = parent._ax;
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py = parent._ay;
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psx = parent._ascaleX;
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sx = psx;
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psy = parent._ascaleY;
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csx = child._ascaleX;
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if (psx < 0) {
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psx = -psx;
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o1 = 180;
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s2 = -1;
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} else {
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o1 = 0;
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s2 = 1;
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}
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if (psy < 0) {
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psy = -psy;
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s2 = -s2;
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}
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if (csx < 0) {
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csx = -csx;
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o2 = 180;
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} else
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o2 = 0;
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r = psx - psy;
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cx = child._ax;
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u = (r < 0 ? -r : r) <= 0.0001f;
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if (!u) {
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cy = 0;
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cwx = parent._a * cx + parent._worldX;
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cwy = parent._c * cx + parent._worldY;
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} else {
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cy = child._ay;
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cwx = parent._a * cx + parent._b * cy + parent._worldX;
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cwy = parent._c * cx + parent._d * cy + parent._worldY;
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}
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id = 1 / (pp->_a * pp->_d - pp->_b * pp->_c);
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x = targetX - pp->_worldX;
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y = targetY - pp->_worldY;
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tx = (x * pp->_d - y * pp->_b) * id - px;
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ty = (y * pp->_a - x * pp->_c) * id - py;
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dd = tx * tx + ty * ty;
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x = cwx - pp->_worldX;
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y = cwy - pp->_worldY;
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dx = (x * pp->_d - y * pp->_b) * id - px;
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dy = (y * pp->_a - x * pp->_c) * id - py;
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l1 = MathUtil::sqrt(dx * dx + dy * dy);
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l2 = child.getData().getLength() * csx;
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if (u) {
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float cosine, a, b;
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l2 *= psx;
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cosine = (dd - l1 * l1 - l2 * l2) / (2 * l1 * l2);
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if (cosine < -1) cosine = -1;
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else if (cosine > 1) {
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cosine = 1;
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if (stretch && l1 + l2 > 0.0001f) sx *= (MathUtil::sqrt(dd) / (l1 + l2) - 1) * alpha + 1;
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}
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a2 = MathUtil::acos(cosine) * bendDir;
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a = l1 + l2 * cosine;
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b = l2 * MathUtil::sin(a2);
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a1 = MathUtil::atan2(ty * a - tx * b, tx * a + ty * b);
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} else {
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float a = psx * l2, b = psy * l2;
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float aa = a * a, bb = b * b, ll = l1 * l1, ta = MathUtil::atan2(ty, tx);
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float c0 = bb * ll + aa * dd - aa * bb, c1 = -2 * bb * l1, c2 = bb - aa;
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float d = c1 * c1 - 4 * c2 * c0;
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if (d >= 0) {
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float q = MathUtil::sqrt(d), r0, r1;
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if (c1 < 0) q = -q;
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q = -(c1 + q) / 2;
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r0 = q / c2;
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r1 = c0 / q;
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r = MathUtil::abs(r0) < MathUtil::abs(r1) ? r0 : r1;
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if (r * r <= dd) {
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y = MathUtil::sqrt(dd - r * r) * bendDir;
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a1 = ta - MathUtil::atan2(y, r);
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a2 = MathUtil::atan2(y / psy, (r - l1) / psx);
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goto break_outer;
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}
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}
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{
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float minAngle = MathUtil::Pi, minX = l1 - a, minDist = minX * minX, minY = 0;
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float maxAngle = 0, maxX = l1 + a, maxDist = maxX * maxX, maxY = 0;
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c0 = -a * l1 / (aa - bb);
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if (c0 >= -1 && c0 <= 1) {
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c0 = MathUtil::acos(c0);
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x = a * MathUtil::cos(c0) + l1;
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y = b * MathUtil::sin(c0);
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d = x * x + y * y;
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if (d < minDist) {
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minAngle = c0;
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minDist = d;
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minX = x;
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minY = y;
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}
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if (d > maxDist) {
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maxAngle = c0;
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maxDist = d;
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maxX = x;
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maxY = y;
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}
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}
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if (dd <= (minDist + maxDist) / 2) {
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a1 = ta - MathUtil::atan2(minY * bendDir, minX);
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a2 = minAngle * bendDir;
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} else {
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a1 = ta - MathUtil::atan2(maxY * bendDir, maxX);
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a2 = maxAngle * bendDir;
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}
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}
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}
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break_outer:
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{
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float os = MathUtil::atan2(cy, cx) * s2;
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a1 = (a1 - os) * MathUtil::Rad_Deg + o1 - parent._arotation;
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if (a1 > 180) a1 -= 360;
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else if (a1 < -180) a1 += 360;
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parent.updateWorldTransform(px, py, parent._rotation + a1 * alpha, sx, parent._ascaleY, 0, 0);
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a2 = ((a2 + os) * MathUtil::Rad_Deg - child._ashearX) * s2 + o2 - child._arotation;
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if (a2 > 180) a2 -= 360;
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else if (a2 < -180) a2 += 360;
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child.updateWorldTransform(cx, cy, child._arotation + a2 * alpha, child._ascaleX, child._ascaleY,
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child._ashearX, child._ashearY);
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}
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}
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IkConstraint::IkConstraint(IkConstraintData &data, Skeleton &skeleton) : Constraint(),
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_data(data),
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_bendDirection(data.getBendDirection()),
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_stretch(data.getStretch()),
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_mix(data.getMix()),
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_target(skeleton.findBone(
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data.getTarget()->getName())) {
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_bones.ensureCapacity(_data.getBones().size());
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for (size_t i = 0; i < _data.getBones().size(); i++) {
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BoneData *boneData = _data.getBones()[i];
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_bones.add(skeleton.findBone(boneData->getName()));
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}
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}
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/// Applies the constraint to the constrained bones.
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void IkConstraint::apply() {
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update();
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}
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void IkConstraint::update() {
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switch (_bones.size()) {
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case 1: {
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Bone *bone0 = _bones[0];
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apply(*bone0, _target->getWorldX(), _target->getWorldY(), _stretch, _mix);
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}
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break;
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case 2: {
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Bone *bone0 = _bones[0];
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Bone *bone1 = _bones[1];
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apply(*bone0, *bone1, _target->getWorldX(), _target->getWorldY(), _bendDirection, _stretch, _mix);
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}
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break;
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}
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}
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int IkConstraint::getOrder() {
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return _data.getOrder();
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}
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IkConstraintData &IkConstraint::getData() {
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return _data;
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}
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Vector<Bone *> &IkConstraint::getBones() {
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return _bones;
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}
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Bone *IkConstraint::getTarget() {
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return _target;
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}
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void IkConstraint::setTarget(Bone *inValue) {
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_target = inValue;
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}
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int IkConstraint::getBendDirection() {
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return _bendDirection;
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}
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void IkConstraint::setBendDirection(int inValue) {
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_bendDirection = inValue;
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}
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float IkConstraint::getMix() {
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return _mix;
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}
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void IkConstraint::setMix(float inValue) {
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_mix = inValue;
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}
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bool IkConstraint::getStretch() {
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return _stretch;
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}
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void IkConstraint::setStretch(bool inValue) {
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_stretch = inValue;
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}
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