Struct CoreGraphicsContext 

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

Implementations

impl<'a> CoreGraphicsContext<'a>

pub fn new_y_up( ctx: &mut CGContextRef, height: f64, text: Option<CoreGraphicsText>, ) -> CoreGraphicsContext<'_>

Create a new context with the y-origin at the top-left corner.

This is not the default for CoreGraphics; but it is the default for piet. To map between the two coordinate spaces you must also pass an explicit height argument.

The optional text argument can be a reusable CoreGraphicsText struct; a new one will be constructed if None is passed.

pub fn new_y_down( ctx: &mut CGContextRef, text: Option<CoreGraphicsText>, ) -> CoreGraphicsContext<'_>

Create a new context with the y-origin at the bottom right corner.

This is the default for core graphics, but not for piet.

The optional text argument can be a reusable CoreGraphicsText struct; a new one will be constructed if None is passed.

Trait Implementations

impl<'a> Drop for CoreGraphicsContext<'a>

fn drop(&mut self)

Executes the destructor for this type.

impl<'a> RenderContext for CoreGraphicsContext<'a>

fn fill(&mut self, shape: impl Shape, brush: &impl IntoBrush<Self>)

Fill a shape.

type Brush = Brush

The type of a “brush”.

type Text = CoreGraphicsText

An associated factory for creating text layouts and related resources.

type TextLayout = CoreGraphicsTextLayout

The type use to represent text layout objects.

type Image = CoreGraphicsImage

The associated type of an image.

fn clear(&mut self, region: impl Into<Option<Rect>>, color: Color)

Replace a region of the canvas with the provided Color.

fn solid_brush(&mut self, color: Color) -> Brush

Create a new brush resource.

fn gradient( &mut self, gradient: impl Into<FixedGradient>, ) -> Result<Brush, Error>

Create a new gradient brush.

fn fill_even_odd(&mut self, shape: impl Shape, brush: &impl IntoBrush<Self>)

Fill a shape, using the even-odd fill rule.

fn clip(&mut self, shape: impl Shape)

Clip to a Shape.

fn stroke( &mut self, shape: impl Shape, brush: &impl IntoBrush<Self>, width: f64, )

Stroke a Shape, using the default StrokeStyle.

fn stroke_styled( &mut self, shape: impl Shape, brush: &impl IntoBrush<Self>, width: f64, style: &StrokeStyle, )

Stroke a Shape, providing a custom StrokeStyle.

fn text(&mut self) -> &mut Self::Text

Returns a reference to a shared Text object.

fn draw_text(&mut self, layout: &Self::TextLayout, pos: impl Into<Point>)

Draw a TextLayout.

fn save(&mut self) -> Result<(), Error>

Save the context state.

fn restore(&mut self) -> Result<(), Error>

Restore the context state.

fn finish(&mut self) -> Result<(), Error>

Finish any pending operations.

fn transform(&mut self, transform: Affine)

Apply a transform.

fn make_image_with_stride( &mut self, width: usize, height: usize, stride: usize, buf: &[u8], format: ImageFormat, ) -> Result<Self::Image, Error>

Create a new Image from a pixel buffer with a specified row stride.

fn draw_image( &mut self, src_image: &Self::Image, rect: impl Into<Rect>, interp: InterpolationMode, )

Draw an Image into the provided Rect.

fn draw_image_area( &mut self, image: &Self::Image, src_rect: impl Into<Rect>, dst_rect: impl Into<Rect>, interp: InterpolationMode, )

Draw a specified area of an Image.

fn capture_image_area( &mut self, src_rect: impl Into<Rect>, ) -> Result<Self::Image, Error>

Create an Image of the specified region of the context.

fn blurred_rect( &mut self, rect: Rect, blur_radius: f64, brush: &impl IntoBrush<Self>, )

Draw a rectangle with Gaussian blur.

fn current_transform(&self) -> Affine

Returns the transformations currently applied to the context.

fn status(&mut self) -> Result<(), Error>

Report an internal error.

fn with_save( &mut self, f: impl FnOnce(&mut Self) -> Result<(), Error>, ) -> Result<(), Error>

Do graphics operations with the context state saved and then restored.

fn make_image( &mut self, width: usize, height: usize, buf: &[u8], format: ImageFormat, ) -> Result<Self::Image, Error>

Create a new Image from a pixel buffer.

impl<'a> IntoBrush<CoreGraphicsContext<'a>> for Brush