imageproc::geometric_transformations

Struct Projection

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pub struct Projection { /* private fields */ }
Expand description

A 2d projective transformation, stored as a row major 3x3 matrix.

Transformations combine by pre-multiplication, i.e. applying P * Q is equivalent to applying Q and then applying P. For example, the following defines a rotation about the point (320.0, 240.0).

use imageproc::geometric_transformations::*;
use std::f32::consts::PI;

let (cx, cy) = (320.0, 240.0);

let c_rotation = Projection::translate(cx, cy)
    * Projection::rotate(PI / 6.0)
    * Projection::translate(-cx, -cy);

See ./examples/projection.rs for more examples.

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impl Projection

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pub fn from_matrix(transform: [f32; 9]) -> Option<Projection>

Creates a 2d projective transform from a row-major 3x3 matrix in homogeneous coordinates.

Returns None if the matrix is not invertible.

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pub fn and_then(self, other: Projection) -> Projection

Combine the transformation with another one. The resulting transformation is equivalent to applying this transformation followed by the other transformation.

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

A translation by (tx, ty).

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pub fn rotate(theta: f32) -> Projection

A clockwise rotation around the top-left corner of the image by theta radians.

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

An anisotropic scaling (sx, sy).

Note that the warp function does not change the size of the input image. If you want to resize an image then use the imageops module in the image crate.

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pub fn invert(self) -> Projection

Inverts the transformation.

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pub fn from_control_points( from: [(f32, f32); 4], to: [(f32, f32); 4], ) -> Option<Projection>

Calculates a projection from a set of four control point pairs.

Trait Implementations§

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impl Clone for Projection

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fn clone(&self) -> Projection

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Projection

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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<'a, 'b> Mul<&'b (f32, f32)> for &'a Projection

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type Output = (f32, f32)

The resulting type after applying the * operator.
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fn mul(self, rhs: &(f32, f32)) -> (f32, f32)

Performs the * operation. Read more
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impl<'a, 'b> Mul<&'b Projection> for &'a Projection

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type Output = Projection

The resulting type after applying the * operator.
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fn mul(self, rhs: &Projection) -> Projection

Performs the * operation. Read more
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impl Mul<(f32, f32)> for Projection

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type Output = (f32, f32)

The resulting type after applying the * operator.
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fn mul(self, rhs: (f32, f32)) -> (f32, f32)

Performs the * operation. Read more
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impl Mul for Projection

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type Output = Projection

The resulting type after applying the * operator.
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fn mul(self, rhs: Projection) -> Projection

Performs the * operation. Read more
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impl Copy for Projection

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type Err = NoError

The error type produced by a failed conversion.
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Convert the given value into an approximately equivalent representation.
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The error type produced by a failed conversion.
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🔬This is a nightly-only experimental API. (clone_to_uninit)
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Convert the subject into an exactly equivalent representation.