Struct iced::widget::Canvas

pub struct Canvas<P, Message, Renderer = Renderer<Theme>>where
    Renderer: Renderer,
    P: Program<Message, Renderer>,{ /* private fields */ }
Expand description

A widget capable of drawing 2D graphics.

Drawing a simple circle

If you want to get a quick overview, here’s how we can draw a simple circle:

// First, we define the data we need for drawing
#[derive(Debug)]
struct Circle {
    radius: f32,
}

// Then, we implement the `Program` trait
impl Program<()> for Circle {
    type State = ();

    fn draw(&self, _state: &(), renderer: &Renderer, _theme: &Theme, bounds: Rectangle, _cursor: mouse::Cursor) -> Vec<Geometry>{
        // We prepare a new `Frame`
        let mut frame = Frame::new(renderer, bounds.size());

        // We create a `Path` representing a simple circle
        let circle = Path::circle(frame.center(), self.radius);

        // And fill it with some color
        frame.fill(&circle, Color::BLACK);

        // Finally, we produce the geometry
        vec![frame.into_geometry()]
    }
}

// Finally, we simply use our `Circle` to create the `Canvas`!
let canvas = Canvas::new(Circle { radius: 50.0 });

Implementations§

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impl<P, Message, Renderer> Canvas<P, Message, Renderer>where Renderer: Renderer, P: Program<Message, Renderer>,

pub fn new(program: P) -> Canvas<P, Message, Renderer>

Available on crate feature canvas only.

Creates a new Canvas.

pub fn width(self, width: impl Into<Length>) -> Canvas<P, Message, Renderer>

Available on crate feature canvas only.

Sets the width of the Canvas.

pub fn height(self, height: impl Into<Length>) -> Canvas<P, Message, Renderer>

Available on crate feature canvas only.

Sets the height of the Canvas.

Trait Implementations§

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impl<P, Message, Renderer> Debug for Canvas<P, Message, Renderer>where P: Debug + Program<Message, Renderer>, Message: Debug, Renderer: Debug + Renderer,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<P, Message, Renderer> Widget<Message, Renderer> for Canvas<P, Message, Renderer>where Renderer: Renderer, P: Program<Message, Renderer>,

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fn tag(&self) -> Tag

Returns the Tag of the Widget.
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fn state(&self) -> State

Returns the State of the Widget.
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fn width(&self) -> Length

Returns the width of the Widget.
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fn height(&self) -> Length

Returns the height of the Widget.
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fn layout( &self, _tree: &mut Tree, _renderer: &Renderer, limits: &Limits ) -> Node

Returns the layout::Node of the Widget. Read more
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fn on_event( &mut self, tree: &mut Tree, event: Event, layout: Layout<'_>, cursor: Cursor, _renderer: &Renderer, _clipboard: &mut dyn Clipboard, shell: &mut Shell<'_, Message>, _viewport: &Rectangle<f32> ) -> Status

Processes a runtime Event. Read more
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fn mouse_interaction( &self, tree: &Tree, layout: Layout<'_>, cursor: Cursor, _viewport: &Rectangle<f32>, _renderer: &Renderer ) -> Interaction

Returns the current mouse::Interaction of the Widget. Read more
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fn draw( &self, tree: &Tree, renderer: &mut Renderer, theme: &<Renderer as Renderer>::Theme, _style: &Style, layout: Layout<'_>, cursor: Cursor, _viewport: &Rectangle<f32> )

Draws the Widget using the associated Renderer.
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fn children(&self) -> Vec<Tree, Global>

Returns the state Tree of the children of the Widget.
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fn diff(&self, _tree: &mut Tree)

Reconciliates the Widget with the provided Tree.
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fn operate( &self, _state: &mut Tree, _layout: Layout<'_>, _renderer: &Renderer, _operation: &mut dyn Operation<Message> )

Applies an Operation to the Widget.
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fn overlay<'a>( &'a mut self, _state: &'a mut Tree, _layout: Layout<'_>, _renderer: &Renderer ) -> Option<Element<'a, Message, Renderer>>

Returns the overlay of the Widget, if there is any.

Auto Trait Implementations§

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impl<P, Message, Renderer> RefUnwindSafe for Canvas<P, Message, Renderer>where Message: RefUnwindSafe, P: RefUnwindSafe, Renderer: RefUnwindSafe,

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impl<P, Message, Renderer> Send for Canvas<P, Message, Renderer>where Message: Send, P: Send, Renderer: Send,

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impl<P, Message, Renderer> Sync for Canvas<P, Message, Renderer>where Message: Sync, P: Sync, Renderer: Sync,

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impl<P, Message, Renderer> Unpin for Canvas<P, Message, Renderer>where Message: Unpin, P: Unpin, Renderer: Unpin,

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impl<P, Message, Renderer> UnwindSafe for Canvas<P, Message, Renderer>where Message: UnwindSafe, P: UnwindSafe, Renderer: UnwindSafe,

Blanket Implementations§

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impl<S, D, Swp, Dwp, T> AdaptInto<D, Swp, Dwp, T> for Swhere T: Real + Zero + Arithmetics + Clone, Swp: WhitePoint<T>, Dwp: WhitePoint<T>, D: AdaptFrom<S, Swp, Dwp, T>,

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fn adapt_into_using<M>(self, method: M) -> Dwhere M: TransformMatrix<T>,

Convert the source color to the destination color using the specified method.
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fn adapt_into(self) -> D

Convert the source color to the destination color using the bradford method by default.
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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, C> ArraysFrom<C> for Twhere C: IntoArrays<T>,

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fn arrays_from(colors: C) -> T

Cast a collection of colors into a collection of arrays.
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impl<T, C> ArraysInto<C> for Twhere C: FromArrays<T>,

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fn arrays_into(self) -> C

Cast this collection of arrays into a collection of colors.
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, C> ComponentsFrom<C> for Twhere C: IntoComponents<T>,

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fn components_from(colors: C) -> T

Cast a collection of colors into a collection of color components.
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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for Twhere T: Any,

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fn into_any(self: Box<T, Global>) -> Box<dyn Any, Global>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T, Global>) -> Rc<dyn Any, Global>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for Twhere T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T, Global>) -> Arc<dyn Any + Sync + Send, Global>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromAngle<T> for T

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fn from_angle(angle: T) -> T

Performs a conversion from angle.
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impl<T, U> FromStimulus<U> for Twhere U: IntoStimulus<T>,

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fn from_stimulus(other: U) -> T

Converts other into Self, while performing the appropriate scaling, rounding and clamping.
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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> IntoAngle<U> for Twhere U: FromAngle<T>,

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fn into_angle(self) -> U

Performs a conversion into T.
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impl<T, U> IntoColor<U> for Twhere U: FromColor<T>,

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fn into_color(self) -> U

Convert into T with values clamped to the color defined bounds Read more
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impl<T, U> IntoColorUnclamped<U> for Twhere U: FromColorUnclamped<T>,

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fn into_color_unclamped(self) -> U

Convert into T. The resulting color might be invalid in its color space Read more
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impl<T> IntoStimulus<T> for T

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fn into_stimulus(self) -> T

Converts self into T, while performing the appropriate scaling, rounding and clamping.
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<'a, T, C> TryComponentsInto<C> for Twhere C: TryFromComponents<T>,

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type Error = <C as TryFromComponents<T>>::Error

The error for when try_into_colors fails to cast.
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fn try_components_into(self) -> Result<C, <T as TryComponentsInto<C>>::Error>

Try to cast this collection of color components into a collection of colors. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T, U> TryIntoColor<U> for Twhere U: TryFromColor<T>,

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fn try_into_color(self) -> Result<U, OutOfBounds<U>>

Convert into T, returning ok if the color is inside of its defined range, otherwise an OutOfBounds error is returned which contains the unclamped color. Read more
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impl<C, U> UintsFrom<C> for Uwhere C: IntoUints<U>,

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fn uints_from(colors: C) -> U

Cast a collection of colors into a collection of unsigned integers.
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impl<C, U> UintsInto<C> for Uwhere C: FromUints<U>,

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fn uints_into(self) -> C

Cast this collection of unsigned integers into a collection of colors.
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impl<T> Upcast<T> for T

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fn upcast(&self) -> Option<&T>

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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> MaybeSend for Twhere T: Send,

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impl<T> WasmNotSend for Twhere T: Send,

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impl<T> WasmNotSync for Twhere T: Sync,