1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
//! Colorable geometrical shapes.
use std::f64::consts::SQRT_2;
use super::prelude::*;
use super::TextNode;
/// Place a node into a sizable and fillable shape.
#[derive(Debug, Hash)]
pub struct ShapeNode<const S: ShapeKind>(pub Option<LayoutNode>);
#[class]
impl<const S: ShapeKind> ShapeNode<S> {
/// How to fill the shape.
pub const FILL: Option<Paint> = None;
/// How the stroke the shape.
pub const STROKE: Smart<Option<Paint>> = Smart::Auto;
/// The stroke's thickness.
pub const THICKNESS: Length = Length::pt(1.0);
/// How much to pad the shape's content.
pub const PADDING: Linear = Linear::zero();
fn construct(_: &mut Vm, args: &mut Args) -> TypResult<Template> {
let size = match S {
SQUARE => args.named::<Length>("size")?.map(Linear::from),
CIRCLE => args.named::<Length>("radius")?.map(|r| 2.0 * Linear::from(r)),
_ => None,
};
let width = match size {
None => args.named("width")?,
size => size,
};
let height = match size {
None => args.named("height")?,
size => size,
};
Ok(Template::inline(
Self(args.find()?).pack().sized(Spec::new(width, height)),
))
}
}
impl<const S: ShapeKind> Layout for ShapeNode<S> {
fn layout(
&self,
vm: &mut Vm,
regions: &Regions,
styles: StyleChain,
) -> TypResult<Vec<Arc<Frame>>> {
let mut frames;
if let Some(child) = &self.0 {
let mut padding = styles.get(Self::PADDING);
if is_round(S) {
padding.rel += Relative::new(0.5 - SQRT_2 / 4.0);
}
// Pad the child.
let child = child.clone().padded(Sides::splat(padding));
let mut pod = Regions::one(regions.first, regions.base, regions.expand);
frames = child.layout(vm, &pod, styles)?;
// Relayout with full expansion into square region to make sure
// the result is really a square or circle.
if is_quadratic(S) {
let length = if regions.expand.x || regions.expand.y {
let target = regions.expand.select(regions.first, Size::zero());
target.x.max(target.y)
} else {
let size = frames[0].size;
let desired = size.x.max(size.y);
desired.min(regions.first.x).min(regions.first.y)
};
pod.first = Size::splat(length);
pod.expand = Spec::splat(true);
frames = child.layout(vm, &pod, styles)?;
}
} else {
// The default size that a shape takes on if it has no child and
// enough space.
let mut size =
Size::new(Length::pt(45.0), Length::pt(30.0)).min(regions.first);
if is_quadratic(S) {
let length = if regions.expand.x || regions.expand.y {
let target = regions.expand.select(regions.first, Size::zero());
target.x.max(target.y)
} else {
size.x.min(size.y)
};
size = Size::splat(length);
} else {
size = regions.expand.select(regions.first, size);
}
frames = vec![Arc::new(Frame::new(size))];
}
let frame = Arc::make_mut(&mut frames[0]);
// Add fill and/or stroke.
let fill = styles.get(Self::FILL);
let thickness = styles.get(Self::THICKNESS);
let stroke = styles
.get(Self::STROKE)
.unwrap_or(fill.is_none().then(|| Color::BLACK.into()))
.map(|paint| Stroke { paint, thickness });
if fill.is_some() || stroke.is_some() {
let geometry = if is_round(S) {
Geometry::Ellipse(frame.size)
} else {
Geometry::Rect(frame.size)
};
let shape = Shape { geometry, fill, stroke };
frame.prepend(Point::zero(), Element::Shape(shape));
}
// Apply link if it exists.
if let Some(url) = styles.get_ref(TextNode::LINK) {
frame.link(url);
}
Ok(frames)
}
}
/// A category of shape.
pub type ShapeKind = usize;
/// A rectangle with equal side lengths.
pub const SQUARE: ShapeKind = 0;
/// A quadrilateral with four right angles.
pub const RECT: ShapeKind = 1;
/// An ellipse with coinciding foci.
pub const CIRCLE: ShapeKind = 2;
/// A curve around two focal points.
pub const ELLIPSE: ShapeKind = 3;
/// Whether a shape kind is curvy.
fn is_round(kind: ShapeKind) -> bool {
matches!(kind, CIRCLE | ELLIPSE)
}
/// Whether a shape kind has equal side length.
fn is_quadratic(kind: ShapeKind) -> bool {
matches!(kind, SQUARE | CIRCLE)
}
|
