Struct DgFrame 

pub struct DgFrame<'a> {
    pub vp: Viewport,
    pub clip: [f32; 4],
    pub geo: &'a DgGeo,
    pub theme: &'a [u32],
    pub bg: u32,
    pub fonts: [(u32, i32); 7],
    pub dark: bool,
    pub moving: bool,
}

what a DgPaint gets at render time

Fields

vp: Viewport

clip: [f32; 4]

the world rectangle x0, y0, x1, y1 that needs pixels now: skip what lies outside

geo: &'a DgGeo

theme: &'a [u32]

the theme’s colours (color(T_*)), the canvas background (opaque)

bg: u32

fonts: [(u32, i32); 7]

font and size (24.8 px at zoom 1) of every TS_* text style

dark: bool

moving: bool

a gesture moves the view or nodes (a pan, wheel turns, a drag of nodes or a waypoint): leave out what costs and nobody reads in passing (small labels; plain shapes, dg_hairline); the canvas is painted in full after it

Implementations

impl DgFrame<'_>

pub fn color(&self, tok: u32) -> u32

0xAARRGGBB of a theme token

pub fn visible(&self, r: [f32; 4]) -> bool

the world rectangle x, y, w, h (with 2 px for anti-aliasing) touches the clip

pub fn route_visible(&self, rt: &DgRoute, width: f32) -> bool

a route stroked width world units wide (dg_stroke_edge, arrow heads included) touches the clip

pub fn find(&self, margin: f32, edges: bool) -> Vec<u32>

the nodes (edges = false: DModel::nodes) or the edges whose spatial buckets touch the clip grown by margin px: ascending indices, a superset of what can need paint (cheaper than looking at all of them)

pub fn font(&self, ts: u32) -> (u32, i32)

font and size (24.8 px) of text style ts at the current zoom