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|
//! Draw freely in 2D.
use crate::{Defaults, Primitive, Renderer};
use iced_native::{
layout, Element, Hasher, Layout, Length, MouseCursor, Point, Size, Widget,
};
use std::hash::Hash;
pub mod layer;
pub mod path;
mod fill;
mod frame;
mod stroke;
pub use fill::Fill;
pub use frame::Frame;
pub use layer::Layer;
pub use path::Path;
pub use stroke::{LineCap, LineJoin, Stroke};
/// A 2D drawable region.
#[derive(Debug)]
pub struct Canvas<'a> {
width: Length,
height: Length,
layers: Vec<Box<dyn Layer + 'a>>,
}
impl<'a> Canvas<'a> {
const DEFAULT_SIZE: u16 = 100;
pub fn new() -> Self {
Canvas {
width: Length::Units(Self::DEFAULT_SIZE),
height: Length::Units(Self::DEFAULT_SIZE),
layers: Vec::new(),
}
}
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
pub fn push(mut self, layer: impl Layer + 'a) -> Self {
self.layers.push(Box::new(layer));
self
}
}
impl<'a, Message> Widget<Message, Renderer> for Canvas<'a> {
fn width(&self) -> Length {
self.width
}
fn height(&self) -> Length {
self.height
}
fn layout(
&self,
_renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let limits = limits.width(self.width).height(self.height);
let size = limits.resolve(Size::ZERO);
layout::Node::new(size)
}
fn draw(
&self,
_renderer: &mut Renderer,
_defaults: &Defaults,
layout: Layout<'_>,
_cursor_position: Point,
) -> (Primitive, MouseCursor) {
let bounds = layout.bounds();
let origin = Point::new(bounds.x, bounds.y);
let size = Size::new(bounds.width, bounds.height);
(
Primitive::Group {
primitives: self
.layers
.iter()
.map(|layer| Primitive::Mesh2D {
origin,
buffers: layer.draw(size),
})
.collect(),
},
MouseCursor::Idle,
)
}
fn hash_layout(&self, state: &mut Hasher) {
std::any::TypeId::of::<Canvas<'static>>().hash(state);
self.width.hash(state);
self.height.hash(state);
}
}
impl<'a, Message> From<Canvas<'a>> for Element<'a, Message, Renderer>
where
Message: 'static,
{
fn from(canvas: Canvas<'a>) -> Element<'a, Message, Renderer> {
Element::new(canvas)
}
}
|
