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|
use iced_native::{Point, Size, Vector};
use crate::{
canvas::{Fill, Path, Stroke},
triangle,
};
#[derive(Debug)]
pub struct Frame {
width: f32,
height: f32,
buffers: lyon::tessellation::VertexBuffers<triangle::Vertex2D, u16>,
transforms: Transforms,
}
#[derive(Debug)]
struct Transforms {
previous: Vec<Transform>,
current: Transform,
}
#[derive(Debug, Clone, Copy)]
struct Transform {
raw: lyon::math::Transform,
is_identity: bool,
}
impl Frame {
pub fn new(width: f32, height: f32) -> Frame {
Frame {
width,
height,
buffers: lyon::tessellation::VertexBuffers::new(),
transforms: Transforms {
previous: Vec::new(),
current: Transform {
raw: lyon::math::Transform::identity(),
is_identity: true,
},
},
}
}
#[inline]
pub fn width(&self) -> f32 {
self.width
}
#[inline]
pub fn height(&self) -> f32 {
self.height
}
#[inline]
pub fn size(&self) -> Size {
Size::new(self.width, self.height)
}
#[inline]
pub fn center(&self) -> Point {
Point::new(self.width / 2.0, self.height / 2.0)
}
pub fn fill(&mut self, path: &Path, fill: Fill) {
use lyon::tessellation::{
BuffersBuilder, FillOptions, FillTessellator,
};
let mut buffers = BuffersBuilder::new(
&mut self.buffers,
FillVertex(match fill {
Fill::Color(color) => color.into_linear(),
}),
);
let mut tessellator = FillTessellator::new();
let result = if self.transforms.current.is_identity {
tessellator.tessellate_path(
path.raw(),
&FillOptions::default(),
&mut buffers,
)
} else {
let path = path.transformed(&self.transforms.current.raw);
tessellator.tessellate_path(
path.raw(),
&FillOptions::default(),
&mut buffers,
)
};
let _ = result.expect("Tessellate path");
}
pub fn stroke(&mut self, path: &Path, stroke: Stroke) {
use lyon::tessellation::{
BuffersBuilder, StrokeOptions, StrokeTessellator,
};
let mut buffers = BuffersBuilder::new(
&mut self.buffers,
StrokeVertex(stroke.color.into_linear()),
);
let mut tessellator = StrokeTessellator::new();
let mut options = StrokeOptions::default();
options.line_width = stroke.width;
options.start_cap = stroke.line_cap.into();
options.end_cap = stroke.line_cap.into();
options.line_join = stroke.line_join.into();
let result = if self.transforms.current.is_identity {
tessellator.tessellate_path(path.raw(), &options, &mut buffers)
} else {
let path = path.transformed(&self.transforms.current.raw);
tessellator.tessellate_path(path.raw(), &options, &mut buffers)
};
let _ = result.expect("Stroke path");
}
#[inline]
pub fn with_save(&mut self, f: impl FnOnce(&mut Frame)) {
self.transforms.previous.push(self.transforms.current);
f(self);
self.transforms.current = self.transforms.previous.pop().unwrap();
}
#[inline]
pub fn translate(&mut self, translation: Vector) {
self.transforms.current.raw = self
.transforms
.current
.raw
.pre_translate(lyon::math::Vector::new(
translation.x,
translation.y,
));
self.transforms.current.is_identity = false;
}
#[inline]
pub fn rotate(&mut self, angle: f32) {
self.transforms.current.raw = self
.transforms
.current
.raw
.pre_rotate(lyon::math::Angle::radians(-angle));
self.transforms.current.is_identity = false;
}
#[inline]
pub fn scale(&mut self, scale: f32) {
self.transforms.current.raw =
self.transforms.current.raw.pre_scale(scale, scale);
self.transforms.current.is_identity = false;
}
pub fn into_mesh(self) -> triangle::Mesh2D {
triangle::Mesh2D {
vertices: self.buffers.vertices,
indices: self.buffers.indices,
}
}
}
struct FillVertex([f32; 4]);
impl lyon::tessellation::FillVertexConstructor<triangle::Vertex2D>
for FillVertex
{
fn new_vertex(
&mut self,
position: lyon::math::Point,
_attributes: lyon::tessellation::FillAttributes<'_>,
) -> triangle::Vertex2D {
triangle::Vertex2D {
position: [position.x, position.y],
color: self.0,
}
}
}
struct StrokeVertex([f32; 4]);
impl lyon::tessellation::StrokeVertexConstructor<triangle::Vertex2D>
for StrokeVertex
{
fn new_vertex(
&mut self,
position: lyon::math::Point,
_attributes: lyon::tessellation::StrokeAttributes<'_, '_>,
) -> triangle::Vertex2D {
triangle::Vertex2D {
position: [position.x, position.y],
color: self.0,
}
}
}
|
