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Diffstat (limited to 'src/util.cpp')
-rw-r--r-- | src/util.cpp | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/util.cpp b/src/util.cpp new file mode 100644 index 0000000..d5e2b96 --- /dev/null +++ b/src/util.cpp @@ -0,0 +1,73 @@ +/* + 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" + + +float bezierInterpolate(float dist, float c0, float c1, float c2, float c3) { + float distp = 1 - dist; + return (distp*distp*distp) * c0 + + 3 * (distp*distp) * dist * c1 + + 3 * (dist*dist) * distp * c2 + + (dist*dist*dist) * c3; +} + +QPointF bezierInterpolateFull (float 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())); +} + + +float roundToNearest(float stepSize, float val) { + if (stepSize==0.0f) return val; + else return round(val/stepSize)*stepSize; +} + +float radiansToDegrees (float radians) { + return (radians * 180.0f) / M_PI; +} + +float degreesToRadians(float degrees) { + return (degrees * M_PI) / 180.0f; +} + +int normaliseAngleDeg (int degrees) { + while (degrees > 180) { + degrees -= 360; + } + while (degrees <= -180) { + degrees += 360; + } + return degrees; +} + +float normaliseAngleRad (float rads) { + while (rads > M_PI) { + rads -= 2 * M_PI; + } + while (rads <= -M_PI) { + rads += 2 * M_PI; + } + return rads; +} + +// convert float to string, squashing very small floats to zero +QString floatToString(float f) { + if (f >= -0.000001 && f <= 0.000001) return "0"; + else return QString::number(f); +} |