[−][src]Trait opencv::imgproc::prelude::LineIteratorTrait

pub trait LineIteratorTrait {
    fn as_raw_LineIterator(&self) -> *const c_void;

    fn as_raw_mut_LineIterator(&mut self) -> *mut c_void;

    fn ptr(&mut self) -> &mut u8 { ... }

    fn set_ptr(&mut self, val: &mut u8) { ... }

    fn ptr0(&self) -> &u8 { ... }

    fn step(&self) -> i32 { ... }

    fn set_step(&mut self, val: i32) { ... }

    fn elem_size(&self) -> i32 { ... }

    fn set_elem_size(&mut self, val: i32) { ... }

    fn err(&self) -> i32 { ... }

    fn set_err(&mut self, val: i32) { ... }

    fn count(&self) -> i32 { ... }

    fn set_count(&mut self, val: i32) { ... }

    fn minus_delta(&self) -> i32 { ... }

    fn set_minus_delta(&mut self, val: i32) { ... }

    fn plus_delta(&self) -> i32 { ... }

    fn set_plus_delta(&mut self, val: i32) { ... }

    fn minus_step(&self) -> i32 { ... }

    fn set_minus_step(&mut self, val: i32) { ... }

    fn plus_step(&self) -> i32 { ... }

    fn set_plus_step(&mut self, val: i32) { ... }

    fn try_deref_mut(&mut self) -> Result<&mut u8> { ... }

    fn pos(&self) -> Result<Point> { ... }
}

Line iterator

The class is used to iterate over all the pixels on the raster line segment connecting two specified points.

The class LineIterator is used to get each pixel of a raster line. It can be treated as versatile implementation of the Bresenham algorithm where you can stop at each pixel and do some extra processing, for example, grab pixel values along the line or draw a line with an effect (for example, with XOR operation).

The number of pixels along the line is stored in LineIterator::count. The method LineIterator::pos returns the current position in the image:

ⓘThis example is not tested
// grabs pixels along the line (pt1, pt2)
// from 8-bit 3-channel image to the buffer
LineIterator it(img, pt1, pt2, 8);
LineIterator it2 = it;
vector<Vec3b> buf(it.count);
 
for(int i = 0; i < it.count; i++, ++it)
   buf[i] = *(const Vec3b*)*it;
 
// alternative way of iterating through the line
for(int i = 0; i < it2.count; i++, ++it2)
{
   Vec3b val = img.at<Vec3b>(it2.pos());
   CV_Assert(buf[i] == val);
}

Required methods

fn as_raw_LineIterator(&self) -> *const c_void

fn as_raw_mut_LineIterator(&mut self) -> *mut c_void

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Provided methods

fn ptr(&mut self) -> &mut u8

fn set_ptr(&mut self, val: &mut u8)

fn ptr0(&self) -> &u8

fn step(&self) -> i32

fn set_step(&mut self, val: i32)

fn elem_size(&self) -> i32

fn set_elem_size(&mut self, val: i32)

fn err(&self) -> i32

fn set_err(&mut self, val: i32)

fn count(&self) -> i32

fn set_count(&mut self, val: i32)

fn minus_delta(&self) -> i32

fn set_minus_delta(&mut self, val: i32)

fn plus_delta(&self) -> i32

fn set_plus_delta(&mut self, val: i32)

fn minus_step(&self) -> i32

fn set_minus_step(&mut self, val: i32)

fn plus_step(&self) -> i32

fn set_plus_step(&mut self, val: i32)

fn try_deref_mut(&mut self) -> Result<&mut u8>

returns pointer to the current pixel

fn pos(&self) -> Result<Point>

returns coordinates of the current pixel

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Implementors

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