Struct Viewer 

pub struct Viewer {
    config: EngineConfig,
    session: Session,
    preferences: Preferences,
    message: Option<Message>,
    last_dir: PathBuf,
    compass: Vec<OrientationSample>,
}

Everything the engine thread owns.

Fields

config: EngineConfig

Where the engine starts and what Help says.

session: Session

The open log, its view state and transforms.

preferences: Preferences

Per-tag display preferences; outlive logs.

message: Option<Message>

The last message for the page, if any.

last_dir: PathBuf

The directory of the last file opened or saved, where dialogs start.

compass: Vec<OrientationSample>

The open log’s compass samples, for the compass panel; empty without one.

Implementations

impl Viewer

pub fn new(config: EngineConfig) -> Result<Self, Error>

A viewer with no log open.

Errors

The library’s error when it cannot make a session or a preference store.

fn tell(&mut self, title: &str, text: impl Into<String>)

Queues a message for the page.

fn remember_dir(&mut self, path: &Path)

Remembers path’s directory for the next dialog.

fn has_log(&mut self) -> bool

Whether a log is open.

pub fn command(&mut self, cmd: &str, args: &Value)

Applies one command; see the module’s table.

fn open(&mut self, path: &Path)

File > Load: remembers the open log’s display choices for its tag, then opens path and applies its tag’s preferences.

fn load_preferences(&mut self, path: &Path)

File > Preferences > Load: replaces every entry from the file, then applies the open log’s.

fn store_preferences(&mut self, path: &Path)

File > Preferences > Store: remembers the open log’s choices, then writes every entry.

pub fn query(&mut self, name: &str, args: &Value) -> Value

Answers one query; see the module’s table.

fn compass_at(&mut self, t: Option<f64>) -> Value

The compass panel at t (the first sample if none is given), as the Qt app’s MyCompass.qml shows it: from the sample at or after t (the last after the end), its display angles (the core’s), the declination added to the heading, and with the battery aft the heading turned 180 degrees and pitch and roll negated.

fn envelope(&mut self, args: &Value) -> Value

Every drawn trace’s envelope over [t0, t1] at width columns.

pub fn view_state(&mut self) -> Value

The whole view state the page draws from.