Struct CanvasView 

pub struct CanvasView {
    pub origin: Point,
    pub zoom: f64,
    pub places: HashMap<u64, Rect>,
}

How a row’s windows stand on a canvas, and how much of it shows.

Fields

origin: Point

The canvas point at the row’s top-left corner.

zoom: f64

Screen pixels per canvas pixel.

places: HashMap<u64, Rect>

Each placed window group’s rect, in canvas pixels. A group with no place yet is not shown until it gets one.

Implementations

impl CanvasView

pub fn to_screen(&self, corner: Point, p: Point) -> Point

Where canvas point p is on screen, for a row whose top-left corner is at corner.

pub fn to_canvas(&self, corner: Point, p: Point) -> Point

The canvas point under screen point p, for a row whose top-left corner is at corner.

pub fn canvas_size_of(&self, on_screen: Rect) -> (f64, f64)

The size a window drawn on_screen has on the canvas: what its client is configured to, so zooming scales its pixels rather than resizing it.

pub fn zoom_about(&mut self, corner: Point, about: Point, factor: f64)

Zoom by factor about screen point about, for a row whose top-left corner is at corner: the canvas point under about stays under it. The zoom stays within CANVAS_ZOOM_MIN and CANVAS_ZOOM_MAX.

pub fn pan_by(&mut self, delta: Vec2)

Pan by delta screen pixels: the canvas follows the hand.

Trait Implementations

impl Clone for CanvasView

fn clone(&self) -> CanvasView

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CanvasView

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

Formats the value using the given formatter.

impl Default for CanvasView

fn default() -> CanvasView

Returns the “default value” for a type.

impl PartialEq for CanvasView

fn eq(&self, other: &CanvasView) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for CanvasView