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LibGfx: Add AffineTransform::rotation()

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Extracts the rotation from a 2D matrix.
This commit is contained in:
Andreas Kling 2023-04-26 16:53:06 +02:00
parent 8c1dacecba
commit a77accf3f4
2 changed files with 12 additions and 0 deletions
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11
Userland/Libraries/LibGfx/AffineTransform.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
#include <AK/Math.h>
#include <AK/Optional.h> #include <AK/Optional.h>
#include <LibGfx/AffineTransform.h> #include <LibGfx/AffineTransform.h>
#include <LibGfx/Quad.h> #include <LibGfx/Quad.h>
@ -229,4 +230,14 @@ Quad<float> AffineTransform::map_to_quad(Rect<float> const& rect) const
}; };
} }
float AffineTransform::rotation() const
{
auto rotation = AK::atan2(b(), a());
while (rotation < -AK::Pi<float>)
rotation += 2.0f * AK::Pi<float>;
while (rotation > AK::Pi<float>)
rotation -= 2.0f * AK::Pi<float>;
return rotation;
}
} }

1
Userland/Libraries/LibGfx/AffineTransform.h
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@ -54,6 +54,7 @@ public:
[[nodiscard]] float x_translation() const; [[nodiscard]] float x_translation() const;
[[nodiscard]] float y_translation() const; [[nodiscard]] float y_translation() const;
[[nodiscard]] FloatPoint translation() const; [[nodiscard]] FloatPoint translation() const;
[[nodiscard]] float rotation() const;
AffineTransform& scale(float sx, float sy); AffineTransform& scale(float sx, float sy);
AffineTransform& scale(FloatPoint s); AffineTransform& scale(FloatPoint s);