Struct Camera 

pub struct Camera { /* private fields */ }

A rectangular viewport onto a larger world, with world/screen conversions.

Implementations

impl Camera

pub const fn new(viewport: Rect, world: Size) -> Self

Create a camera drawing into viewport (screen cells) over a world of world cells. The initial origin is (0, 0); call center_on to follow a target.

pub const fn viewport(&self) -> Rect

The screen rectangle the world is drawn into.

pub const fn world(&self) -> Size

The world dimensions.

pub const fn origin(&self) -> Pos

The world cell shown at the viewport’s top-left corner.

pub fn set_viewport(&mut self, viewport: Rect)

Replace the viewport (for example after a terminal resize), keeping the world unchanged and re-clamping the origin so it stays in bounds.

pub fn center_on(&mut self, target: Pos)

Center the view on target (world coords), clamped to the world edges so the viewport never scrolls past [0, world).

pub fn visible_bounds(&self) -> Rect

The world rectangle currently visible, clamped to world bounds.

pub const fn world_to_screen(&self, world: Pos) -> Option<Pos>

Map a world position to its screen position, or None if it is outside the visible viewport.

pub fn screen_to_world(&self, screen: Pos) -> Option<Pos>

Map a screen position back to a world position, or None if it is outside the viewport or beyond the world (useful for mouse picking).

pub fn cells(&self) -> impl Iterator<Item = (Pos, Pos)> + '_

Iterate the visible cells as (world, screen) position pairs, in row-major order. Only cells that exist in the world are yielded, so the caller can fill the rest of the viewport with a background.

Trait Implementations

impl Clone for Camera

fn clone(&self) -> Camera

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Camera

impl Debug for Camera

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

Formats the value using the given formatter.

impl Eq for Camera

impl PartialEq for Camera

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Camera