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Separate coord space transform class for more correct scaling

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This commit is contained in:
Yousef Khadadeh 2025-08-04 10:47:24 +03:00
parent 46370e5762
commit d261293d6b
7 changed files with 307 additions and 7 deletions
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63
src/CoordSpaceHelperTransform.cpp Normal file
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#include "CoordSpaceHelperTransform.hpp"
bool CoordSpaceHelperTransform::operator==(const CoordSpaceHelperTransform& otherCoords) const {
return rotation == otherCoords.rotation && pos == otherCoords.pos && inverseScale == otherCoords.inverseScale;
}
bool CoordSpaceHelperTransform::operator!=(const CoordSpaceHelperTransform& otherCoords) const {
return rotation != otherCoords.rotation || pos != otherCoords.pos || inverseScale != otherCoords.inverseScale;
}
WorldVec CoordSpaceHelperTransform::to_space_world(const WorldVec& coord) const {
return rotate_world_coord(FixedPoint::multiplier_vec_div((coord - pos), inverseScale), -rotation);
}
WorldVec CoordSpaceHelperTransform::from_space_world(const WorldVec& coord) const {
return FixedPoint::multiplier_vec_mult(rotate_world_coord(coord, rotation), inverseScale) + pos;
}
CoordSpaceHelper CoordSpaceHelperTransform::other_coord_space_to_this_space(const CoordSpaceHelper& other) const {
CoordSpaceHelper toRet;
toRet.pos = to_space_world(other.pos);
toRet.rotation = other.rotation - rotation;
toRet.inverseScale = other.inverseScale / inverseScale;
return toRet;
}
CoordSpaceHelper CoordSpaceHelperTransform::other_coord_space_from_this_space(const CoordSpaceHelper& other) const {
CoordSpaceHelper toRet;
toRet.pos = from_space_world(other.pos);
toRet.rotation = other.rotation + rotation;
toRet.inverseScale = other.inverseScale * inverseScale;
return toRet;
}
void CoordSpaceHelperTransform::translate(const WorldVec& translation) {
pos += translation;
}
void CoordSpaceHelperTransform::rotate_about(const WorldVec& rotatePos, double angle) {
WorldVec a = pos - rotatePos;
FixedPoint::Number<boost::multiprecision::cpp_int, 15> s = FixedPoint::Number<boost::multiprecision::cpp_int, 15>(std::sin(angle));
FixedPoint::Number<boost::multiprecision::cpp_int, 15> c = FixedPoint::Number<boost::multiprecision::cpp_int, 15>(std::cos(angle));
set_rotation(rotation + angle);
pos = {
rotatePos.x() + a.x().multiply_different_precision(c) - a.y().multiply_different_precision(s),
rotatePos.y() + a.x().multiply_different_precision(s) + a.y().multiply_different_precision(c)
};
}
void CoordSpaceHelperTransform::set_rotation(double newRotation) {
rotation = newRotation;
// using circular fmod caused inaccuracies, so these loops might be a better solution
while(rotation >= 2.0 * std::numbers::pi)
rotation -= 2.0 * std::numbers::pi;
while (rotation < 0.0)
rotation += 2.0 * std::numbers::pi;
}
void CoordSpaceHelperTransform::scale_about(const WorldVec& scalePos, const WorldMultiplier& scaleAmount) {
inverseScale = inverseScale / scaleAmount;
WorldVec mVec = pos - scalePos;
pos = scalePos + FixedPoint::multiplier_vec_div(mVec, scaleAmount);
}