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use crate::core::{Size, Transformation};
/// A viewing region for displaying computer graphics.
#[derive(Debug, Clone)]
pub struct Viewport {
physical_size: Size<u32>,
logical_size: Size<f32>,
scale_factor: f32,
projection: Transformation,
}
impl Viewport {
/// Creates a new [`Viewport`] with the given physical dimensions and scale
/// factor.
pub fn with_physical_size(size: Size<u32>, scale_factor: f32) -> Viewport {
Viewport {
physical_size: size,
logical_size: Size::new(
size.width as f32 / scale_factor,
size.height as f32 / scale_factor,
),
scale_factor,
projection: Transformation::orthographic(size.width, size.height),
}
}
/// Returns the physical size of the [`Viewport`].
pub fn physical_size(&self) -> Size<u32> {
self.physical_size
}
/// Returns the physical width of the [`Viewport`].
pub fn physical_width(&self) -> u32 {
self.physical_size.width
}
/// Returns the physical height of the [`Viewport`].
pub fn physical_height(&self) -> u32 {
self.physical_size.height
}
/// Returns the logical size of the [`Viewport`].
pub fn logical_size(&self) -> Size<f32> {
self.logical_size
}
/// Returns the scale factor of the [`Viewport`].
pub fn scale_factor(&self) -> f32 {
self.scale_factor
}
/// Returns the projection transformation of the [`Viewport`].
pub fn projection(&self) -> Transformation {
self.projection
}
}