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Simplify drawing logic in clock example

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Héctor Ramón Jiménez 2020-04-14 07:08:24 +02:00
parent 3df49bebd4
commit 6d7f2b30cc
1 changed files with 32 additions and 42 deletions
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78
examples/clock/src/main.rs
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@ -99,63 +99,53 @@ impl canvas::Drawable for LocalTime {
let center = frame.center(); let center = frame.center();
let radius = frame.width().min(frame.height()) / 2.0; let radius = frame.width().min(frame.height()) / 2.0;
let offset = Vector::new(center.x, center.y);
let clock = Path::circle(center, radius); let clock = Path::circle(center, radius);
frame.fill(&clock, Color::from_rgb8(0x12, 0x93, 0xD8)); frame.fill(&clock, Color::from_rgb8(0x12, 0x93, 0xD8));
fn draw_hand( let short_hand =
n: u32, Path::line(Point::ORIGIN, Point::new(0.0, -0.5 * radius));
total: u32,
length: f32,
offset: Vector,
path: &mut canvas::path::Builder,
) {
let turns = n as f32 / total as f32;
let t = 2.0 * std::f32::consts::PI * (turns - 0.25);
let x = length * t.cos(); let long_hand =
let y = length * t.sin(); Path::line(Point::ORIGIN, Point::new(0.0, -0.8 * radius));
path.line_to(Point::new(x, y) + offset); let thin_stroke = canvas::Stroke {
}
let hour_and_minute_hands = canvas::Path::new(|path| {
path.move_to(center);
draw_hand(self.hour, 12, 0.5 * radius, offset, path);
path.move_to(center);
draw_hand(self.minute, 60, 0.8 * radius, offset, path)
});
frame.stroke(
&hour_and_minute_hands,
canvas::Stroke {
width: radius / 100.0 * 3.0,
color: Color::WHITE,
line_cap: canvas::LineCap::Round,
..canvas::Stroke::default()
},
);
let second_hand = canvas::Path::new(|path| {
path.move_to(center);
draw_hand(self.second, 60, 0.8 * radius, offset, path)
});
frame.stroke(
&second_hand,
canvas::Stroke {
width: radius / 100.0, width: radius / 100.0,
color: Color::WHITE, color: Color::WHITE,
line_cap: canvas::LineCap::Round, line_cap: canvas::LineCap::Round,
..canvas::Stroke::default() ..canvas::Stroke::default()
}, };
);
let wide_stroke = canvas::Stroke {
width: thin_stroke.width * 3.0,
..thin_stroke
};
frame.translate(Vector::new(center.x, center.y));
frame.with_save(|frame| {
frame.rotate(hand_rotation(self.hour, 12));
frame.stroke(&short_hand, wide_stroke);
});
frame.with_save(|frame| {
frame.rotate(hand_rotation(self.minute, 60));
frame.stroke(&long_hand, wide_stroke);
});
frame.with_save(|frame| {
frame.rotate(hand_rotation(self.second, 60));
frame.stroke(&long_hand, thin_stroke);
});
} }
} }
fn hand_rotation(n: u32, total: u32) -> f32 {
let turns = n as f32 / total as f32;
2.0 * std::f32::consts::PI * turns
}
mod time { mod time {
use iced::futures; use iced::futures;