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LibGfx+PixelPaint: Add Point::end_point_for_aspect_ratio method

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Previously we only had `Point::end_point_for_square_aspect_ratio`,
which was convenient for PixelPaint but assumed the aspect ratio
was always fixed at 1. This patch replaces it with a new mthod that
takes in an arbitrary aspect ratio and computes the end point based
off that.

There's some explicit casting going on in `Point.cpp` to ensure that
the types line up, since we're templating Point based on `T`.`
This commit is contained in:
Mustafa Quraish 2021-09-15 19:34:50 -04:00 • committed by Andreas Kling
parent 5c244a7893
commit f14c891ba5
4 changed files with 15 additions and 10 deletions
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19
Userland/Libraries/LibGfx/Point.cpp
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@ -20,14 +20,19 @@ void Point<T>::constrain(Rect<T> const& rect)
}
template<typename T>
[[nodiscard]] Point<T> Point<T>::end_point_for_square_aspect_ratio(Point<T> const& previous_end_point) const
[[nodiscard]] Point<T> Point<T>::end_point_for_aspect_ratio(Point<T> const& previous_end_point, float aspect_ratio) const
{
const T dx = previous_end_point.x() - x();
const T dy = previous_end_point.y() - y();
const T x_sign = dx >= 0 ? 1 : -1;
const T y_sign = dy >= 0 ? 1 : -1;
const T abs_size = AK::max(AK::abs(dx), AK::abs(dy));
return { x() + x_sign * abs_size, y() + y_sign * abs_size };
VERIFY(aspect_ratio > 0);
const T x_sign = previous_end_point.x() >= x() ? 1 : -1;
const T y_sign = previous_end_point.y() >= y() ? 1 : -1;
T dx = AK::abs(previous_end_point.x() - x());
T dy = AK::abs(previous_end_point.y() - y());
if (dx > dy) {
dy = (T)((float)dx / aspect_ratio);
} else {
dx = (T)((float)dy * aspect_ratio);
}
return { x() + x_sign * dx, y() + y_sign * dy };
}
template<>