Struct geos::WKTWriter

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pub struct WKTWriter<'a> { /* private fields */ }

Expand description

The WKTWriter type is used to generate WKT formatted output from Geometry.

Example

use geos::{Geometry, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (2.5 2.5)").expect("Invalid geometry");
let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");

assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5000000000000000 2.5000000000000000)");

Implementations

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impl<'a> WKTWriter<'a>

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pub fn new() -> GResult<WKTWriter<'a>>

Creates a new WKTWriter instance.

Example

use geos::{Geometry, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (2.5 2.5)").expect("Invalid geometry");
let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");

assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5000000000000000 2.5000000000000000)");

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pub fn new_with_context(
context: Arc<ContextHandle<'a>>
) -> GResult<WKTWriter<'a>>

Creates a new WKTWriter instance with a given context.

Example

use geos::{ContextHandling, Geometry, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (2.5 2.5)").expect("Invalid geometry");
let mut writer = WKTWriter::new_with_context(point_geom.clone_context())
                           .expect("Failed to create WKTWriter");

assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5000000000000000 2.5000000000000000)");

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pub fn write<'b, G: Geom<'b>>(&mut self, geometry: &G) -> GResult<String>

Writes out the given geometry as WKT format.

Example

use geos::{Geometry, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (2.5 2.5)").expect("Invalid geometry");
let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");

assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5000000000000000 2.5000000000000000)");

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pub fn set_rounding_precision(&mut self, precision: u32)

Sets the precision to be used when calling WKTWriter::write. Often, what users actually want is the WKTWriter::set_trim method instead.

Example

use geos::{Geometry, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (2.5 2.5)").expect("Invalid geometry");
let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");

writer.set_rounding_precision(2);
assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.50 2.50)");

writer.set_rounding_precision(4);
assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5000 2.5000)");

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pub fn set_output_dimension(&mut self, dimension: OutputDimension)

Sets the number of dimensions to be used when calling WKTWriter::write. By default, it is 2.

Example

use geos::{Geometry, OutputDimension, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (1.1 2.2 3.3)").expect("Invalid geometry");
let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");
writer.set_trim(true);

assert_eq!(writer.write(&point_geom).unwrap(), "POINT (1.1 2.2)");

writer.set_output_dimension(OutputDimension::ThreeD);
assert_eq!(writer.write(&point_geom).unwrap(), "POINT Z (1.1 2.2 3.3)");

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pub fn get_out_dimension(&self) -> GResult<OutputDimension>

Returns the number of dimensions to be used when calling WKTWriter::write. By default, it is 2.

Example

use geos::{OutputDimension, WKTWriter};

let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");

assert_eq!(writer.get_out_dimension(), Ok(OutputDimension::TwoD));
writer.set_output_dimension(OutputDimension::ThreeD);
assert_eq!(writer.get_out_dimension(), Ok(OutputDimension::ThreeD));

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pub fn set_trim(&mut self, trim: bool)

Enables/disables trimming of unnecessary decimals.

Example

use geos::{Geometry, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (2.5 2.5)").expect("Invalid geometry");
let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");

assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5000000000000000 2.5000000000000000)");

writer.set_trim(true);
assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5 2.5)");

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pub fn set_old_3D(&mut self, use_old_3D: bool)

Enables/disables old 3D/4D WKT style generation.

Example

use geos::{Geometry, OutputDimension, WKTWriter};

let point_geom = Geometry::new_from_wkt("POINT (2.5 2.5 2.5)").expect("Invalid geometry");
let mut writer = WKTWriter::new().expect("Failed to create WKTWriter");

writer.set_output_dimension(OutputDimension::ThreeD);
writer.set_trim(true);

assert_eq!(writer.write(&point_geom).unwrap(), "POINT Z (2.5 2.5 2.5)");

writer.set_old_3D(true);
assert_eq!(writer.write(&point_geom).unwrap(), "POINT (2.5 2.5 2.5)");

Trait Implementations

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impl<'a> ContextHandling for WKTWriter<'a>

fn set_context_handle(&mut self, context: ContextHandle<'a>)

Set the context handle to the WKTWriter.

use geos::{ContextInteractions, ContextHandle, WKTWriter};

let context_handle = ContextHandle::init().expect("invalid init");
let mut writer = WKTWriter::new().expect("failed to create WKT writer");
context_handle.set_notice_message_handler(Some(Box::new(|s| println!("new message: {}", s))));
writer.set_context_handle(context_handle);

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fn get_context_handle(&self) -> &ContextHandle<'a>

Get the context handle of the WKTWriter.

use geos::{ContextInteractions, WKTWriter};

let mut writer = WKTWriter::new().expect("failed to create WKT writer");
let context = writer.get_context_handle();
context.set_notice_message_handler(Some(Box::new(|s| println!("new message: {}", s))));