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//! Draw freely in 2D.
use crate::{Defaults, Primitive, Renderer};
use iced_native::{
layout, Color, Element, Hasher, Layout, Length, MouseCursor, Point, Size,
Widget,
};
use std::hash::Hash;
pub mod layer;
pub mod path;
mod data;
mod frame;
pub use data::Data;
pub use frame::Frame;
pub use layer::Layer;
pub use path::Path;
/// 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) {
(Primitive::None, 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)
}
}
#[derive(Debug, Clone, Copy)]
pub struct Stroke {
pub color: Color,
pub width: f32,
pub line_cap: LineCap,
pub line_join: LineJoin,
}
impl Default for Stroke {
fn default() -> Stroke {
Stroke {
color: Color::BLACK,
width: 1.0,
line_cap: LineCap::default(),
line_join: LineJoin::default(),
}
}
}
#[derive(Debug, Clone, Copy)]
pub enum LineCap {
Butt,
Square,
Round,
}
impl Default for LineCap {
fn default() -> LineCap {
LineCap::Butt
}
}
impl From<LineCap> for lyon::tessellation::LineCap {
fn from(line_cap: LineCap) -> lyon::tessellation::LineCap {
match line_cap {
LineCap::Butt => lyon::tessellation::LineCap::Butt,
LineCap::Square => lyon::tessellation::LineCap::Square,
LineCap::Round => lyon::tessellation::LineCap::Round,
}
}
}
#[derive(Debug, Clone, Copy)]
pub enum LineJoin {
Miter,
Round,
Bevel,
}
impl Default for LineJoin {
fn default() -> LineJoin {
LineJoin::Miter
}
}
impl From<LineJoin> for lyon::tessellation::LineJoin {
fn from(line_join: LineJoin) -> lyon::tessellation::LineJoin {
match line_join {
LineJoin::Miter => lyon::tessellation::LineJoin::Miter,
LineJoin::Round => lyon::tessellation::LineJoin::Round,
LineJoin::Bevel => lyon::tessellation::LineJoin::Bevel,
}
}
}
#[derive(Debug, Clone, Copy)]
pub enum Fill {
Color(Color),
}
impl Default for Fill {
fn default() -> Fill {
Fill::Color(Color::BLACK)
}
}
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