Struct libcamera::controls::LensPosition
source · pub struct LensPosition(pub f32);
Expand description
Acts as a control to instruct the lens to move to a particular position and also reports back the position of the lens for each frame.
The LensPosition control is ignored unless the AfMode is set to AfModeManual, though the value is reported back unconditionally in all modes.
The units are a reciprocal distance scale like dioptres but normalised for the hyperfocal distance. That is, for a lens with hyperfocal distance H, and setting it to a focal distance D, the lens position LP, which is generally a non-integer, is given by
\f$LP = \frac{H}{D}\f$
For example:
0 moves the lens to infinity. 0.5 moves the lens to twice the hyperfocal distance. 1 moves the lens to the hyperfocal position. And larger values will focus the lens ever closer.
\todo Define a property to report the Hyperforcal distance of calibrated lenses.
\todo Define a property to report the maximum and minimum positions of this lens. The minimum value will often be zero (meaning infinity).
Tuple Fields§
§0: f32
Methods from Deref<Target = f32>§
pub const RADIX: u32 = 2u32
pub const MANTISSA_DIGITS: u32 = 24u32
pub const DIGITS: u32 = 6u32
pub const EPSILON: f32 = 1.1920929E-7f32
pub const MIN: f32 = -3.40282347E+38f32
pub const MIN_POSITIVE: f32 = 1.17549435E-38f32
pub const MAX: f32 = 3.40282347E+38f32
pub const MIN_EXP: i32 = -125i32
pub const MAX_EXP: i32 = 128i32
pub const MIN_10_EXP: i32 = -37i32
pub const MAX_10_EXP: i32 = 38i32
pub const NAN: f32 = NaNf32
pub const INFINITY: f32 = +Inff32
pub const NEG_INFINITY: f32 = -Inff32
1.62.0 · sourcepub fn total_cmp(&self, other: &f32) -> Ordering
pub fn total_cmp(&self, other: &f32) -> Ordering
Return the ordering between self
and other
.
Unlike the standard partial comparison between floating point numbers,
this comparison always produces an ordering in accordance to
the totalOrder
predicate as defined in the IEEE 754 (2008 revision)
floating point standard. The values are ordered in the following sequence:
- negative quiet NaN
- negative signaling NaN
- negative infinity
- negative numbers
- negative subnormal numbers
- negative zero
- positive zero
- positive subnormal numbers
- positive numbers
- positive infinity
- positive signaling NaN
- positive quiet NaN.
The ordering established by this function does not always agree with the
PartialOrd
and PartialEq
implementations of f32
. For example,
they consider negative and positive zero equal, while total_cmp
doesn’t.
The interpretation of the signaling NaN bit follows the definition in the IEEE 754 standard, which may not match the interpretation by some of the older, non-conformant (e.g. MIPS) hardware implementations.
Example
struct GoodBoy {
name: String,
weight: f32,
}
let mut bois = vec![
GoodBoy { name: "Pucci".to_owned(), weight: 0.1 },
GoodBoy { name: "Woofer".to_owned(), weight: 99.0 },
GoodBoy { name: "Yapper".to_owned(), weight: 10.0 },
GoodBoy { name: "Chonk".to_owned(), weight: f32::INFINITY },
GoodBoy { name: "Abs. Unit".to_owned(), weight: f32::NAN },
GoodBoy { name: "Floaty".to_owned(), weight: -5.0 },
];
bois.sort_by(|a, b| a.weight.total_cmp(&b.weight));
Trait Implementations§
source§impl Clone for LensPosition
impl Clone for LensPosition
source§fn clone(&self) -> LensPosition
fn clone(&self) -> LensPosition
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read more