Struct RadialGradientNode

pub struct RadialGradientNode { /* private fields */ }

A render node for a radial gradient.

GLib type: Shared boxed type with reference counted clone semantics.

Implementations

impl RadialGradientNode

pub fn as_ptr(&self) -> *mut GskRadialGradientNode

Return the inner pointer to the underlying C value.

pub unsafe fn from_glib_ptr_borrow(ptr: &*mut GskRadialGradientNode) -> &Self

Borrows the underlying C value.

impl RadialGradientNode

pub fn new( bounds: &Rect, center: &Point, hradius: f32, vradius: f32, start: f32, end: f32, color_stops: &[ColorStop], ) -> RadialGradientNode

Creates a RenderNode that draws a radial gradient.

The radial gradient starts around @center. The size of the gradient is dictated by @hradius in horizontal orientation and by @vradius in vertical orientation.

bounds

the bounds of the node

center

the center of the gradient

hradius

the horizontal radius

vradius

the vertical radius

start

a percentage >= 0 that defines the start of the gradient around @center

end

a percentage >= 0 that defines the end of the gradient around @center

color_stops

a pointer to an array of ColorStop defining the gradient. The offsets of all color stops must be increasing. The first stop’s offset must be >= 0 and the last stop’s offset must be <= 1.

Returns

A new RenderNode

pub fn center(&self) -> Point

Retrieves the center pointer for the gradient.

Returns

the center point for the gradient

pub fn color_stops(&self) -> Vec<ColorStop>

Retrieves the color stops in the gradient.

Returns

the color stops in the gradient

pub fn end(&self) -> f32

Retrieves the end value for the gradient.

Returns

the end value for the gradient

pub fn hradius(&self) -> f32

Retrieves the horizontal radius for the gradient.

Returns

the horizontal radius for the gradient

pub fn n_color_stops(&self) -> usize

Retrieves the number of color stops in the gradient.

Returns

the number of color stops

pub fn start(&self) -> f32

Retrieves the start value for the gradient.

Returns

the start value for the gradient

pub fn vradius(&self) -> f32

Retrieves the vertical radius for the gradient.

Returns

the vertical radius for the gradient

Methods from Deref<Target = RenderNode>

pub fn as_ptr(&self) -> *mut GskRenderNode

Return the inner pointer to the underlying C value.

pub const NONE: Option<&'static RenderNode> = None

pub fn draw(&self, cr: &Context)

Draw the contents of @self to the given cairo context.

Typically, you’ll use this function to implement fallback rendering of RenderNodes on an intermediate Cairo context, instead of using the drawing context associated to a gdk::Surface’s rendering buffer.

For advanced nodes that cannot be supported using Cairo, in particular for nodes doing 3D operations, this function may fail.

cr

cairo context to draw to

pub fn bounds(&self) -> Rect

Retrieves the boundaries of the @self.

The node will not draw outside of its boundaries.

Returns

bounds

return location for the boundaries

pub fn node_type(&self) -> RenderNodeType

Returns the type of the @self.

Returns

the type of the RenderNode

pub fn opaque_rect(&self) -> Option<Rect>

Available on crate feature v4_16 only.

Gets an opaque rectangle inside the node that GTK can determine to be fully opaque.

There is no guarantee that this is indeed the largest opaque rectangle or that regions outside the rectangle are not opaque. This function is a best effort with that goal.

The rectangle will be fully contained in the bounds of the node.

Returns

true if part or all of the rendernode is opaque, false if no opaque region could be found.

pub fn serialize(&self) -> Bytes

Serializes the @self for later deserialization via gsk_render_node_deserialize(). No guarantees are made about the format used other than that the same version of GTK will be able to deserialize the result of a call to gsk_render_node_serialize() and gsk_render_node_deserialize() will correctly reject files it cannot open that were created with previous versions of GTK.

The intended use of this functions is testing, benchmarking and debugging. The format is not meant as a permanent storage format.

Returns

a GBytes representing the node.

pub fn write_to_file(&self, filename: impl AsRef<Path>) -> Result<(), Error>

This function is equivalent to calling serialize() followed by file_set_contents().

See those two functions for details on the arguments.

It is mostly intended for use inside a debugger to quickly dump a render node to a file for later inspection.

filename

the file to save it to.

Returns

true if saving was successful

pub fn is<T: IsRenderNode>(&self) -> bool

pub fn type_(&self) -> Type

pub fn downcast_ref<T: IsRenderNode>(&self) -> Option<&T>

Trait Implementations

impl AsRef<RenderNode> for RadialGradientNode

fn as_ref(&self) -> &RenderNode

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for RadialGradientNode

fn clone(&self) -> Self

Makes a clone of this shared reference.

This increments the strong reference count of the reference. Dropping the reference will decrement it again.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RadialGradientNode

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

Formats the value using the given formatter.

impl Deref for RadialGradientNode

type Target = RenderNode

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'a> FromValue<'a> for RadialGradientNode

Available on crate feature v4_6 only.

type Checker = GenericValueTypeOrNoneChecker<RadialGradientNode>

Value type checker.

unsafe fn from_value(value: &'a Value) -> Self

Get the contained value from a Value.

impl IsRenderNode for RadialGradientNode

const NODE_TYPE: RenderNodeType = RenderNodeType::RadialGradientNode

fn upcast(self) -> RenderNode

fn upcast_ref(&self) -> &RenderNode

impl StaticType for RadialGradientNode

fn static_type() -> Type

Returns the type identifier of Self.

impl ToValue for RadialGradientNode

Available on crate feature v4_6 only.

fn to_value(&self) -> Value

Convert a value to a Value.

fn value_type(&self) -> Type

Returns the type identifier of self.

impl ToValueOptional for RadialGradientNode

Available on crate feature v4_6 only.

fn to_value_optional(s: Option<&Self>) -> Value

Convert an Option to a Value.

impl ValueType for RadialGradientNode

Available on crate feature v4_6 only.

type Type = RadialGradientNode

Type to get the Type from.