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/*
TikZiT - a GUI diagram editor for TikZ
Copyright (C) 2018 Aleks Kissinger
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "util.h"
qreal bezierInterpolate(qreal dist, qreal c0, qreal c1, qreal c2, qreal c3) {
qreal distp = 1 - dist;
return (distp*distp*distp) * c0 +
3 * (distp*distp) * dist * c1 +
3 * (dist*dist) * distp * c2 +
(dist*dist*dist) * c3;
}
QPointF bezierInterpolateFull (qreal dist, QPointF c0, QPointF c1, QPointF c2, QPointF c3) {
return QPointF(bezierInterpolate (dist, c0.x(), c1.x(), c2.x(), c3.x()),
bezierInterpolate (dist, c0.y(), c1.y(), c2.y(), c3.y()));
}
qreal roundToNearest(qreal stepSize, qreal val) {
if (stepSize==0.0) return val;
else return round(val/stepSize)*stepSize;
}
qreal radiansToDegrees (qreal radians) {
return (radians * 180.0) / M_PI;
}
qreal degreesToRadians(qreal degrees) {
return (degrees * M_PI) / 180.0;
}
int normaliseAngleDeg (int degrees) {
while (degrees > 180) {
degrees -= 360;
}
while (degrees <= -180) {
degrees += 360;
}
return degrees;
}
qreal normaliseAngleRad (qreal rads) {
while (rads > M_PI) {
rads -= 2 * M_PI;
}
while (rads <= -M_PI) {
rads += 2 * M_PI;
}
return rads;
}
bool almostZero(qreal f) {
return (f >= -0.000001 && f <= 0.000001);
}
bool almostEqual(qreal f1, qreal f2) {
return almostZero(f1 - f2);
}
// convert qreal to string, squashing very small qreals to zero
QString floatToString(qreal f) {
if (almostZero(f)) return "0";
else return QString::number(f);
}
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