Struct flo_render_canvas::CanvasRenderer

pub struct CanvasRenderer { /* fields omitted */ }

Changes commands for flo_canvas into commands for flo_render

Implementations

impl CanvasRenderer

pub fn new() -> CanvasRenderer

Creates a new canvas renderer

pub fn set_viewport(
    &mut self,
    x: Range<f32>,
    y: Range<f32>,
    window_width: f32,
    window_height: f32,
    scale: f32
)

Sets the viewport used by this renderer

The window width and height is the overall size of the canvas (which can be considered to have coordinates from 0,0 to window_width, window_height). The viewport, given by x and y here, is the region of the window that will actually be rendered.

The viewport and window coordinates are all in pixels. The scale used when generating transformations (so with a scale of 2, a CanvasHeight request of 1080 will act as a height 2160 in the viewport).

pub fn get_viewport(&self) -> (Range<f32>, Range<f32>)

Returns the coordinates of the viewport, as x and y ranges

pub fn get_active_transform(&self) -> Transform2D

Retrieves the active transform for the canvas (which is fully up to date after rendering)

pub fn get_viewport_transform(&self) -> Transform2D

Retrieves a transformation that maps a point from canvas coordinates to viewport coordinates

pub fn get_window_transform(&self) -> Transform2D

Retrieves a transformation that maps a point from canvas coordinates to window coordinates

pub fn process_drawing<'a, DrawIter: 'a + Iterator<Item = Draw>>(
    &'a mut self,
    drawing: DrawIter
) -> impl 'a + Future<Output = ()>

Starts processing a drawing, returning a future that completes once all of the tessellation operations have finished

pub fn draw<'a, DrawIter: 'a + Send + Iterator<Item = Draw>>(
    &'a mut self,
    drawing: DrawIter
) -> impl 'a + Send + Stream<Item = RenderAction>

Returns a stream of render actions after applying a set of canvas drawing operations to this renderer