Struct Canvas 

pub struct Canvas;

Immediate-mode canvas facade that wraps the low-level drawing functions.

All methods paint immediately (no retained scene graph). Create one per frame or per start_app call and issue draw commands through it.

Implementations

impl Canvas

pub fn new() -> Self

Create a new canvas handle. This is zero-cost — no allocation occurs.

pub fn clear(&self, color: Color)

Clear the canvas with a solid color.

pub fn fill_rect(&self, rect: Rect, color: Color)

Draw a filled rectangle.

pub fn fill_rounded_rect(&self, rect: Rect, radius: f32, color: Color)

Draw a filled rounded rectangle with uniform corner radius.

pub fn fill_circle(&self, center: Point2D, radius: f32, color: Color)

Draw a filled circle.

pub fn arc( &self, center: Point2D, radius: f32, start_angle: f32, end_angle: f32, thickness: f32, color: Color, )

Draw a circular arc stroke from start_angle to end_angle (radians).

pub fn bezier( &self, from: Point2D, ctrl1: Point2D, ctrl2: Point2D, to: Point2D, thickness: f32, color: Color, )

Draw a cubic Bézier curve stroke.

pub fn text(&self, text: &str, pos: Point2D, size: f32, color: Color)

Draw text at a position.

pub fn line(&self, from: Point2D, to: Point2D, thickness: f32, color: Color)

Draw a line between two points.

pub fn image(&self, rect: Rect, data: &[u8])

Draw an image from encoded bytes (PNG, JPEG, GIF, WebP).

pub fn linear_gradient(&self, rect: Rect, stops: &[GradientStop])

Fill a rectangle with a linear gradient.

pub fn radial_gradient(&self, rect: Rect, stops: &[GradientStop])

Fill a rectangle with a radial gradient.

pub fn save(&self)

Push the current transform/clip/opacity state.

pub fn restore(&self)

Restore the most recently saved state.

pub fn translate(&self, tx: f32, ty: f32)

Apply a 2D translation to subsequent draw commands.

pub fn rotate(&self, angle: f32)

Apply a 2D rotation (radians) to subsequent draw commands.

pub fn scale(&self, sx: f32, sy: f32)

Apply a uniform scale to subsequent draw commands.

pub fn transform(&self, a: f32, b: f32, c: f32, d: f32, tx: f32, ty: f32)

Apply a full 2D affine transform.

pub fn clip(&self, rect: Rect)

Intersect the current clip with a rectangle.

pub fn set_opacity(&self, alpha: f32)

Set layer opacity (0.0–1.0) for subsequent draw commands.

pub fn dimensions(&self) -> (u32, u32)

Get the canvas dimensions in pixels.

pub fn set_content_size(&self, width: u32, height: u32)

Set the virtual size of the canvas content to enable host scrollbars.

pub fn scroll_position(&self) -> (f32, f32)

Get the current absolute (scroll_x, scroll_y) coordinates.

pub fn set_scroll_position(&self, x: f32, y: f32)

Programmatically set the absolute scroll position.

pub fn width(&self) -> u32

Get the canvas width in pixels.

pub fn height(&self) -> u32

Get the canvas height in pixels.

pub fn text_ex( &self, text: &str, pos: Point2D, size: f32, color: Color, family: &str, weight: u32, style: u32, align: u32, )

Draw text with explicit family, weight, style, and horizontal alignment.

Pass an empty family to use the system UI font.

pub fn measure_text( &self, size: f32, family: &str, weight: u32, style: u32, text: &str, ) -> TextMetrics

Measure a line of text shaped with the given font parameters.

Trait Implementations

impl Default for Canvas

fn default() -> Self

Returns the “default value” for a type.