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#pragma once
#include "itransformable.h"
#include "math/Matrix4.h"
#include "math/Quaternion.h"
const Vector3 c_translation_identity(0, 0, 0);
const Quaternion c_rotation_identity(Quaternion::Identity());
const Vector3 c_scale_identity(1, 1, 1);
/**
* Base implementation of the ITransformable interface.
*/
class Transformable :
public ITransformable
{
protected:
// Flags to signal which type of transformation this is about
enum TransformationType
{
NoTransform = 0,
Translation = 1 << 0,
Rotation = 1 << 1,
Scale = 1 << 2,
};
private:
Vector3 _translation;
Quaternion _rotation;
Vector3 _scale;
TransformModifierType _type;
unsigned int _transformationType;
public:
Transformable() :
_translation(c_translation_identity),
_rotation(Quaternion::Identity()),
_scale(c_scale_identity),
_type(TRANSFORM_PRIMITIVE),
_transformationType(NoTransform)
{}
void setType(TransformModifierType type) override
{
_type = type;
}
TransformModifierType getType() const
{
return _type;
}
void setTranslation(const Vector3& value) override
{
_translation = value;
_transformationType |= Translation;
_onTransformationChanged();
}
void setRotation(const Quaternion& value) override
{
_rotation = value;
_transformationType |= Rotation;
_onTransformationChanged();
}
void setRotation(const Quaternion& value, const Vector3& worldPivot, const Matrix4& localToWorld) override
{
// greebo: When rotating around a pivot, the operation can be split into a rotation
// and a translation part. Calculate the translation part and apply it.
// Translate the world pivot into local coordinates (we only care about the translation part)
Vector3 localPivot = worldPivot - localToWorld.translation();
Matrix4 rotation = Matrix4::getRotationQuantised(value);
// This is basically T = P - R*P
Vector3 translation(
localPivot.x() - rotation.xx()*localPivot.x() - rotation.yx()*localPivot.y() - rotation.zx()*localPivot.z(),
localPivot.y() - rotation.xy()*localPivot.x() - rotation.yy()*localPivot.y() - rotation.zy()*localPivot.z(),
localPivot.z() - rotation.xz()*localPivot.x() - rotation.yz()*localPivot.y() - rotation.zz()*localPivot.z()
);
_translation = translation;
_transformationType |= Translation;
// Regardless of the pivot, the object rotates "by itself", so let's apply the rotation in any case
_rotation = value;
_transformationType |= Rotation;
_onTransformationChanged();
}
void setScale(const Vector3& value) override
{
_scale = value;
_transformationType |= Scale;
_onTransformationChanged();
}
void freezeTransform() override
{
if (_translation != c_translation_identity ||
_rotation != c_rotation_identity ||
_scale != c_scale_identity)
{
_applyTransformation();
_translation = c_translation_identity;
_rotation = c_rotation_identity;
_scale = c_scale_identity;
_transformationType = NoTransform;
_onTransformationChanged();
}
}
/* greebo: This reverts the currently active transformation
* by setting the scale/rotation/translation to identity.
* It's enough to call _onTransformationChanged() as this
* usually marks the node's geometry as "needs re-evaluation",
* and during next rendering turn everything will be updated.
*/
void revertTransform() override
{
_translation = c_translation_identity;
_rotation = c_rotation_identity;
_scale = c_scale_identity;
_transformationType = NoTransform;
_onTransformationChanged();
}
const Vector3& getTranslation() const
{
return _translation;
}
const Quaternion& getRotation() const
{
return _rotation;
}
const Vector3& getScale() const
{
return _scale;
}
Matrix4 calculateTransform() const
{
return getMatrixForComponents(getTranslation(), getRotation(), getScale());
}
protected:
/**
* Returns a bitmask indicating which transformation classes we're dealing with
* to allow subclasses to specialise their math on the requested transformation.
* See TransformationType enum for bit values.
*/
unsigned int getTransformationType() const
{
return _transformationType;
}
/**
* greebo: Signal method for subclasses. This gets called
* as soon as anything (translation, scale, rotation) is changed.
*
* To be implemented by subclasses
*/
virtual void _onTransformationChanged() = 0;
/**
* greebo: Signal method to be implemented by subclasses.
* Is invoked whenever the transformation is frozen.
*/
virtual void _applyTransformation() = 0;
// For rotation around pivot points the code needs to know the object center
// before the operation started.
// Subclasses need to provide this information.
virtual const Vector3& getUntransformedOrigin() override
{
static Vector3 center(0, 0, 0);
return center;
}
private:
static Matrix4 getMatrixForComponents(const Vector3& translation, const Quaternion& rotation, const Vector3& scale)
{
Matrix4 result(Matrix4::getRotationQuantised(rotation));
result.setXCol(result.xCol3() * scale.x());
result.setYCol(result.yCol3() * scale.y());
result.setZCol(result.zCol3() * scale.z());
result.setTranslation(translation);
return result;
}
};
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