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|
//! This example shows how to use touch events in `Canvas` to draw
//! a circle around each fingertip. This only works on touch-enabled
//! computers like Microsoft Surface.
use iced::mouse;
use iced::touch;
use iced::widget::canvas::event;
use iced::widget::canvas::stroke::{self, Stroke};
use iced::widget::canvas::{self, Canvas, Geometry};
use iced::{Color, Element, Fill, Point, Rectangle, Renderer, Theme};
use std::collections::HashMap;
pub fn main() -> iced::Result {
tracing_subscriber::fmt::init();
iced::application("Multitouch - Iced", Multitouch::update, Multitouch::view)
.antialiasing(true)
.centered()
.run()
}
#[derive(Default)]
struct Multitouch {
cache: canvas::Cache,
fingers: HashMap<touch::Finger, Point>,
}
#[derive(Debug)]
enum Message {
FingerPressed { id: touch::Finger, position: Point },
FingerLifted { id: touch::Finger },
}
impl Multitouch {
fn update(&mut self, message: Message) {
match message {
Message::FingerPressed { id, position } => {
self.fingers.insert(id, position);
self.cache.clear();
}
Message::FingerLifted { id } => {
self.fingers.remove(&id);
self.cache.clear();
}
}
}
fn view(&self) -> Element<Message> {
Canvas::new(self).width(Fill).height(Fill).into()
}
}
impl canvas::Program<Message> for Multitouch {
type State = ();
fn update(
&self,
_state: &mut Self::State,
event: event::Event,
_bounds: Rectangle,
_cursor: mouse::Cursor,
) -> (event::Status, Option<Message>) {
match event {
event::Event::Touch(touch_event) => match touch_event {
touch::Event::FingerPressed { id, position }
| touch::Event::FingerMoved { id, position } => (
event::Status::Captured,
Some(Message::FingerPressed { id, position }),
),
touch::Event::FingerLifted { id, .. }
| touch::Event::FingerLost { id, .. } => (
event::Status::Captured,
Some(Message::FingerLifted { id }),
),
},
_ => (event::Status::Ignored, None),
}
}
fn draw(
&self,
_state: &Self::State,
renderer: &Renderer,
_theme: &Theme,
bounds: Rectangle,
_cursor: mouse::Cursor,
) -> Vec<Geometry> {
let fingerweb = self.cache.draw(renderer, bounds.size(), |frame| {
if self.fingers.len() < 2 {
return;
}
// Collect tuples of (id, point);
let mut zones: Vec<(u64, Point)> =
self.fingers.iter().map(|(id, pt)| (id.0, *pt)).collect();
// Sort by ID
zones.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
// Generate sorted list of points
let vpoints: Vec<(f64, f64)> = zones
.iter()
.map(|(_, p)| (f64::from(p.x), f64::from(p.y)))
.collect();
let diagram: voronator::VoronoiDiagram<
voronator::delaunator::Point,
> = voronator::VoronoiDiagram::from_tuple(
&(0.0, 0.0),
&(700.0, 700.0),
&vpoints,
)
.expect("Generate Voronoi diagram");
for (cell, zone) in diagram.cells().iter().zip(zones) {
let mut builder = canvas::path::Builder::new();
for (index, p) in cell.points().iter().enumerate() {
let p = Point::new(p.x as f32, p.y as f32);
match index {
0 => builder.move_to(p),
_ => builder.line_to(p),
}
}
let path = builder.build();
let color_r = (10 % zone.0) as f32 / 20.0;
let color_g = (10 % (zone.0 + 8)) as f32 / 20.0;
let color_b = (10 % (zone.0 + 3)) as f32 / 20.0;
frame.fill(
&path,
Color {
r: color_r,
g: color_g,
b: color_b,
a: 1.0,
},
);
frame.stroke(
&path,
Stroke {
style: stroke::Style::Solid(Color::BLACK),
width: 3.0,
..Stroke::default()
},
);
}
});
vec![fingerweb]
}
}
|
