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Matrix

Struct Matrix 

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pub struct Matrix {
    pub a: f32,
    pub b: f32,
    pub c: f32,
    pub d: f32,
    pub e: f32,
    pub f: f32,
}
Expand description

アフィン変換行列 [a b c d e f]

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§a: f32§b: f32§c: f32§d: f32§e: f32§f: f32

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impl Matrix

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pub fn identity() -> Self

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pub fn translate(tx: f32, ty: f32) -> Self

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pub fn scale(sx: f32, sy: f32) -> Self

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pub fn rotate(rad: f32) -> Self

角度はラジアン。正の角度で「x 軸から y 軸へ」回る(Canvas の既定は y 軸が下向きなので、画面上は時計回りに見える)。

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pub fn multiply(&self, m: &Matrix) -> Matrix

selfm右から掛ける(self * m)。

Canvas の ctx.transform(...) の意味論。後から積んだ変換ほど 点に対して先に効く。

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pub fn apply(&self, x: f32, y: f32) -> (f32, f32)

点を変換する。

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pub fn determinant(&self) -> f32

行列式。0 なら退化(逆行列を持たない)。

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pub fn invert(&self) -> Option<Matrix>

逆行列。退化していれば None(呼び出し側は変換を諦める)。

isPointInPath のようにデバイス座標をユーザー座標へ戻す用途で要る。

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impl Clone for Matrix

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fn clone(&self) -> Matrix

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Copy for Matrix

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impl Debug for Matrix

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for Matrix

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl PartialEq for Matrix

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fn eq(&self, other: &Matrix) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for Matrix

Auto Trait Implementations§

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.