Struct TransViewport 

pub struct TransViewport { /* private fields */ }

Viewport transformer.

Maps world coordinates to device coordinates with optional aspect ratio preservation. Can produce a TransAffine matrix for use with other components.

Port of C++ trans_viewport.

Implementations

impl TransViewport

pub fn new() -> Self

pub fn preserve_aspect_ratio( &mut self, align_x: f64, align_y: f64, aspect: AspectRatio, )

Set aspect ratio preservation mode and alignment.

pub fn set_device_viewport(&mut self, x1: f64, y1: f64, x2: f64, y2: f64)

Set the device (screen) viewport rectangle.

pub fn set_world_viewport(&mut self, x1: f64, y1: f64, x2: f64, y2: f64)

Set the world (logical) viewport rectangle.

pub fn device_viewport(&self) -> (f64, f64, f64, f64)

Get the device viewport rectangle.

pub fn world_viewport(&self) -> (f64, f64, f64, f64)

Get the world viewport rectangle.

pub fn world_viewport_actual(&self) -> (f64, f64, f64, f64)

Get the actual (computed) world viewport after aspect ratio adjustment.

pub fn is_valid(&self) -> bool

pub fn align_x(&self) -> f64

pub fn align_y(&self) -> f64

pub fn aspect_ratio(&self) -> AspectRatio

pub fn transform(&self, x: &mut f64, y: &mut f64)

Transform world coordinates to device coordinates.

pub fn transform_scale_only(&self, x: &mut f64, y: &mut f64)

Transform only the scale component (no translation).

pub fn inverse_transform(&self, x: &mut f64, y: &mut f64)

Transform device coordinates back to world coordinates.

pub fn inverse_transform_scale_only(&self, x: &mut f64, y: &mut f64)

Inverse transform only the scale component.

pub fn device_dx(&self) -> f64

pub fn device_dy(&self) -> f64

pub fn scale_x(&self) -> f64

pub fn scale_y(&self) -> f64

pub fn scale(&self) -> f64

pub fn to_affine(&self) -> TransAffine

Convert to an equivalent TransAffine matrix.

pub fn to_affine_scale_only(&self) -> TransAffine

Convert to an affine matrix with only the scale component.

Trait Implementations

impl Default for TransViewport

fn default() -> Self

Returns the “default value” for a type.