use crate::{
core::{algebra::Vector2, color::Color, math::Vector2Ext, pool::Handle},
draw::{CommandTexture, Draw, DrawingContext},
message::UiMessage,
widget::{Widget, WidgetBuilder},
BuildContext, Control, UiNode, UserInterface,
};
use std::{
any::{Any, TypeId},
ops::{Deref, DerefMut},
};
#[derive(Clone, Debug)]
pub enum Primitive {
Triangle {
points: [Vector2<f32>; 3],
},
Line {
begin: Vector2<f32>,
end: Vector2<f32>,
thickness: f32,
},
Circle {
center: Vector2<f32>,
radius: f32,
segments: usize,
},
}
fn line_thickness_vector(a: Vector2<f32>, b: Vector2<f32>, thickness: f32) -> Vector2<f32> {
if let Some(dir) = (b - a).try_normalize(f32::EPSILON) {
Vector2::new(dir.y, -dir.x).scale(thickness * 0.5)
} else {
Vector2::default()
}
}
impl Primitive {
pub fn bounds(&self) -> (Vector2<f32>, Vector2<f32>) {
match self {
Primitive::Triangle { points } => {
let min = points[0]
.per_component_min(&points[1])
.per_component_min(&points[2]);
let max = points[0]
.per_component_max(&points[1])
.per_component_max(&points[2]);
(min, max)
}
Primitive::Line {
begin,
end,
thickness,
} => {
let tv = line_thickness_vector(*begin, *end, *thickness);
let mut min = begin + tv;
let mut max = min;
for v in &[begin - tv, end + tv, end - tv] {
min = min.per_component_min(v);
max = max.per_component_max(v);
}
(min, max)
}
Primitive::Circle { radius, center, .. } => {
let radius = Vector2::new(*radius, *radius);
(center - radius, center + radius)
}
}
}
}
#[derive(Clone)]
pub struct VectorImage {
widget: Widget,
primitives: Vec<Primitive>,
}
crate::define_widget_deref!(VectorImage);
impl Control for VectorImage {
fn query_component(&self, type_id: TypeId) -> Option<&dyn Any> {
if type_id == TypeId::of::<Self>() {
Some(self)
} else {
None
}
}
fn measure_override(&self, _ui: &UserInterface, _available_size: Vector2<f32>) -> Vector2<f32> {
if self.primitives.is_empty() {
Default::default()
} else {
let mut max = Vector2::new(-f32::MAX, -f32::MAX);
let mut min = Vector2::new(f32::MAX, f32::MAX);
for primitive in self.primitives.iter() {
let (pmin, pmax) = primitive.bounds();
min = min.per_component_min(&pmin);
max = max.per_component_max(&pmax);
}
max - min
}
}
fn draw(&self, drawing_context: &mut DrawingContext) {
let bounds = self.widget.screen_bounds();
for primitive in self.primitives.iter() {
match primitive {
Primitive::Triangle { points } => {
let pts = [
bounds.position + points[0],
bounds.position + points[1],
bounds.position + points[2],
];
drawing_context.push_triangle_filled(pts);
}
Primitive::Line {
begin,
end,
thickness,
} => {
drawing_context.push_line(
bounds.position + *begin,
bounds.position + *end,
*thickness,
);
}
Primitive::Circle {
center,
radius,
segments,
} => drawing_context.push_circle(
bounds.position + *center,
*radius,
*segments,
Color::WHITE,
),
}
}
drawing_context.commit(
self.clip_bounds(),
self.widget.foreground(),
CommandTexture::None,
None,
);
}
fn handle_routed_message(&mut self, ui: &mut UserInterface, message: &mut UiMessage) {
self.widget.handle_routed_message(ui, message);
}
}
pub struct VectorImageBuilder {
widget_builder: WidgetBuilder,
primitives: Vec<Primitive>,
}
impl VectorImageBuilder {
pub fn new(widget_builder: WidgetBuilder) -> Self {
Self {
widget_builder,
primitives: Default::default(),
}
}
pub fn with_primitives(mut self, primitives: Vec<Primitive>) -> Self {
self.primitives = primitives;
self
}
pub fn build_node(self) -> UiNode {
let image = VectorImage {
widget: self.widget_builder.build(),
primitives: self.primitives,
};
UiNode::new(image)
}
pub fn build(self, ctx: &mut BuildContext) -> Handle<UiNode> {
ctx.add_node(self.build_node())
}
}