Struct ContainerViewport 

pub struct ContainerViewport {
    pub width_px: u32,
    pub height_px: u32,
    pub dpr_subpx: u32,
    pub zoom_subpx: u32,
}

Container dimensions and display parameters for fit computation.

Represents the available rendering area in physical pixels, plus the DPR and zoom factor needed for correct pixel-to-cell mapping.

Fields

width_px: u32

Available width in physical pixels.

height_px: u32

Available height in physical pixels.

dpr_subpx: u32

Device pixel ratio in sub-pixel units (256 = 1.0x DPR).

Must be > 0. Common values:

• 256 = 1.0x (standard density)
• 512 = 2.0x (Retina)
• 768 = 3.0x (high-DPI mobile)

zoom_subpx: u32

Zoom factor in sub-pixel units (256 = 100% zoom).

Must be > 0. Common values:

• 256 = 100%
• 320 = 125%
• 384 = 150%
• 512 = 200%

Implementations

impl ContainerViewport

pub fn new(width_px: u32, height_px: u32, dpr: f64, zoom: f64) -> Option<Self>

Create a viewport with explicit parameters.

Returns None if dimensions are zero or DPR/zoom are zero.

pub fn simple(width_px: u32, height_px: u32) -> Option<Self>

Create a simple viewport at 1x DPR, 100% zoom.

pub fn effective_width_subpx(&self) -> u32

Effective pixel width adjusted for DPR and zoom, in sub-pixel units.

Computes physical_px / (dpr * zoom) expressed in the same sub-pixel units as CellMetrics (1/256 px), so the caller can divide by cell.width_subpx to get column count.

pub fn effective_height_subpx(&self) -> u32

Effective pixel height adjusted for DPR and zoom, in sub-pixel units.

Trait Implementations

impl Clone for ContainerViewport

fn clone(&self) -> ContainerViewport

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ContainerViewport

impl Debug for ContainerViewport

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

Formats the value using the given formatter.

impl Display for ContainerViewport

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

Formats the value using the given formatter.

impl Eq for ContainerViewport

impl Hash for ContainerViewport

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ContainerViewport

fn eq(&self, other: &ContainerViewport) -> 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 ContainerViewport