mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
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116 lines
3.8 KiB
C++
116 lines
3.8 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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#include <spine/MathUtil.h>
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#include <math.h>
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#include <random>
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#include <cstdlib>
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using namespace spine;
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float MathUtil::abs(float v) {
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return ((v) < 0 ? -(v) : (v));
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}
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float MathUtil::sign(float v) {
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return ((v) < 0 ? -1.0f : (v) > 0 ? 1.0f : 0.0f);
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}
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float MathUtil::clamp(float x, float min, float max) {
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return ((x) < (min) ? (min) : ((x) > (max) ? (max) : (x)));
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}
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float MathUtil::fmod(float a, float b) {
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return (float)::fmod(a, b);
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}
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/// Returns atan2 in radians, faster but less accurate than Math.Atan2. Average error of 0.00231 radians (0.1323
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/// degrees), largest error of 0.00488 radians (0.2796 degrees).
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float MathUtil::atan2(float y, float x) {
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return (float)::atan2(y, x);
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}
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/// Returns the cosine in radians from a lookup table.
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float MathUtil::cos(float radians) {
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return (float)::cos(radians);
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}
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/// Returns the sine in radians from a lookup table.
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float MathUtil::sin(float radians) {
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return (float)::sin(radians);
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}
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float MathUtil::sqrt(float v) {
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return (float)::sqrt(v);
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}
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float MathUtil::acos(float v) {
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return (float)::acos(v);
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}
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/// Returns the sine in radians from a lookup table.
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float MathUtil::sinDeg(float degrees) {
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return (float)::sin(degrees * DEG_RAD);
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}
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/// Returns the cosine in radians from a lookup table.
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float MathUtil::cosDeg(float degrees) {
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return (float)::cos(degrees * DEG_RAD);
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}
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/* Need to pass 0 as an argument, so VC++ doesn't error with C2124 */
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static bool _isNan(float value, float zero) {
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float _nan = (float) 0.0 / zero;
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return 0 == memcmp((void *) &value, (void *) &_nan, sizeof(value));
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}
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bool MathUtil::isNan(float v) {
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return _isNan(v, 0);
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}
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float MathUtil::random() {
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return ::rand() / (float)RAND_MAX;
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}
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float MathUtil::randomTriangular(float min, float max) {
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return randomTriangular(min, max, (min + max) * 0.5f);
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}
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float MathUtil::randomTriangular(float min, float max, float mode) {
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float u = random();
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float d = max - min;
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if (u <= (mode - min) / d) return min + sqrt(u * d * (mode - min));
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return max - sqrt((1 - u) * d * (max - mode));
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}
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float MathUtil::pow(float a, float b) {
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return (float)::pow(a, b);
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}
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