Skip to main content

Transformer

doc_quad::geom::transform

Struct Transformer

pub struct Transformer;

Expand description

顶点排序与坐标变换

Implementations§

impl Transformer

pub fn sort_points(pts: [Vec2; 4]) -> [Vec2; 4]

将四个点排序为 [左上, 右上, 右下, 左下] 顺序。

§算法说明

计算四点质心。
基于各点相对质心的极角排序（图像坐标系 y 向下，atan2 产生顺时针顺序）。
旋转数组，使 x+y 最小的点（左上角）位于索引 0。

§坐标系说明

输入为图像坐标系（y 轴向下）。atan2 在此坐标系下产生顺时针角度增长，排序结果为顺时针顶点序列，符合 [左上, 右上, 右下, 左下] 的预期语义。

pub fn get_homography(_src: [Vec2; 4], _dst_w: f32, _dst_h: f32) -> Mat3

计算单应性矩阵（Homography），将透视四边形映射到标准矩形。

§算法说明

标准实现需解 8×8 线性方程组 Ah=b（DLT 算法），利用 SVD 求最小二乘解。当前为占位实现，返回单位矩阵。

§参数

src：源四边形顶点，顺序为 [左上, 右上, 右下, 左下]
dst_w、dst_h：目标矩形宽高

Auto Trait Implementations§

impl Freeze for Transformer

impl RefUnwindSafe for Transformer

impl Send for Transformer

impl Sync for Transformer

impl Unpin for Transformer

impl UnsafeUnpin for Transformer

impl UnwindSafe for Transformer

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> IntoEither for T

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

impl<T> Pointable for T

const ALIGN: usize

The alignment of pointer.

type Init = T

The type for initializers.

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.