Struct tetra::graphics::Camera

pub struct Camera {
    pub position: Vec2<f32>,
    pub rotation: f32,
    pub zoom: f32,
    pub viewport_width: f32,
    pub viewport_height: f32,
    // some fields omitted
}

A camera that can be used to transform the scene.

Fields

position: Vec2<f32>

The position of the camera.

rotation: f32

The rotation of the camera, in radians.

zoom: f32

The zoom level of the camera.

viewport_width: f32

The width of the camera's viewport.

viewport_height: f32

The height of the camera's viewport.

Methods

impl Camera

pub fn new(viewport_width: f32, viewport_height: f32) -> Camera

Creates a new camera.

pub fn with_window_size(ctx: &Context) -> Camera

Creates a new camera, with the viewport size set to match the window.

If the window is resizable, make sure that you call set_viewport_size when the size changes!

pub fn set_viewport_size(&mut self, width: f32, height: f32)

Sets the size of the camera's viewport.

pub fn update(&mut self)

Recalculates the transformation matrix, based on the data currently contained within the camera.

pub fn as_matrix(&self) -> Mat4<f32>

Returns the current transformation matrix.

Pass this to graphics::set_transform_matrix to apply the transformation to your scene!

pub fn project(&self, point: Vec2<f32>) -> Vec2<f32>

Projects a point from screen co-ordinates to camera co-ordinates.

pub fn unproject(&self, point: Vec2<f32>) -> Vec2<f32>

Projects a point from camera co-ordinates to screen co-ordinates.

pub fn mouse_position(&self, ctx: &Context) -> Vec2<f32>

Returns the mouse's position in camera space.

This is a shortcut for calling project(input::get_mouse_position(ctx)).

pub fn mouse_x(&self, ctx: &Context) -> f32

Returns the X co-ordinate of the mouse's position in camera space.

This is a shortcut for calling project(input::get_mouse_position(ctx)).x.

pub fn mouse_y(&self, ctx: &Context) -> f32

Returns the Y co-ordinate of the mouse's position in camera space.

This is a shortcut for calling project(input::get_mouse_position(ctx)).y.

Trait Implementations

impl Clone for Camera

fn clone(&self) -> Camera

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Camera

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

Formats the value using the given formatter.