Struct Viewport

pub struct Viewport {
    pub dpi: Dpi,
    pub vbox: ViewBox,
    pub transform: ValidTransform,
}

Holds the size of the current viewport in the user’s coordinate system.

Fields

dpi: Dpi

vbox: ViewBox

Corners of the current coordinate space.

transform: ValidTransform

The viewport’s coordinate system, or “user coordinate system” in SVG terms.

Implementations

impl Viewport

pub fn new(dpi: Dpi, view_box_width: f64, view_box_height: f64) -> Viewport

FIXME: this is just used in Handle::with_height_to_user(), and in length.rs’s test suite. Find a way to do this without involving a default identity transform.

pub fn with_units(&self, units: CoordUnits) -> Viewport

Creates a new viewport suitable for a certain kind of units.

For objectBoundingBox, CSS lengths which are in percentages refer to the size of the current viewport. Librsvg implements that by keeping the same current transformation matrix, and setting a viewport size of (1.0, 1.0).

For userSpaceOnUse, we just duplicate the current viewport, since that kind of units means to use the current coordinate system unchanged.

pub fn with_view_box(&self, width: f64, height: f64) -> Viewport

Returns a viewport with a new size for normalizing Length values.

pub fn with_explicit_transform(&self, transform: ValidTransform) -> Viewport

Copies the viewport, but just uses a new transform.

This is used when we are about to draw in a temporary surface: the transform for that surface is computed independenly of the one in the current viewport.

pub fn with_composed_transform( &self, transform: ValidTransform, ) -> Result<Viewport, InvalidTransform>

pub fn empty_bbox(&self) -> Box<BoundingBox>

Trait Implementations

impl Clone for Viewport

fn clone(&self) -> Viewport

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Viewport