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use raylib::ffi::Color;
use std::str::FromStr;
/// Convert an html-style colour into a raylib Color-struct if possible. If there is an error in
/// the formatting, it returns `None`.
pub fn colour_from_html(html: &str) -> Option<Color> {
/* The html-code must be exactly seven characters long, one for the hash and two per primary
* colour.
*/
if html.len() != 7 {
return None;
}
let extract_hex = |string: &str, pos: usize| {
u8::from_str_radix(
string.get(pos..pos + 2).expect("Could not split string"),
16,
)
.ok()
};
let red: Option<u8> = extract_hex(html, 1);
let green: Option<u8> = extract_hex(html, 3);
let blue: Option<u8> = extract_hex(html, 5);
if let (Some(r), Some(g), Some(b)) = (red, green, blue) {
Some(Color { r, g, b, a: 255 })
} else {
None
}
}
/// The style of the end of the stroke.
/// See [stroke-line-cap property](https://www.w3.org/TR/SVG11/painting.html#StrokeLinecapProperty)
/// in the SVG Documentation.
pub enum StrokeLineCap {
Butt,
Round,
Square,
}
/// The style of the joining corners of the stroke.
/// See [stroke-line-join property](https://www.w3.org/TR/SVG11/painting.html#StrokeLinejoinProperty)
/// in the SVG Documentation
pub enum StrokeLineJoin {
Miter,
Round,
Bevel,
}
/// The style of a path drawing instruction.
pub struct Style {
pub fill: Option<Color>,
pub stroke: Color,
pub stroke_width: f32,
pub stroke_linecap: StrokeLineCap,
pub stroke_linejoin: StrokeLineJoin,
pub stroke_opacity: f32,
}
impl FromStr for StrokeLineCap {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"butt" => Ok(Self::Butt),
"round" => Ok(Self::Round),
"square" => Ok(Self::Square),
_ => Err("No such line-cap style".to_owned()),
}
}
}
impl Default for StrokeLineCap {
fn default() -> Self {
StrokeLineCap::Butt
}
}
impl FromStr for StrokeLineJoin {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"miter" => Ok(Self::Miter),
"round" => Ok(Self::Round),
"bevel" => Ok(Self::Bevel),
_ => Err("No such line-join style".to_owned()),
}
}
}
impl Default for StrokeLineJoin {
fn default() -> Self {
StrokeLineJoin::Miter
}
}
impl FromStr for Style {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
// Split into CSS-attributes
let attributes: Vec<&str> = s.split(';').collect();
// Split the attributes into name and value pairs and parse them into a style struct
let mut style = Style::default();
for attribute in attributes {
let attribute_parts: Vec<&str> = attribute.split(':').collect();
if attribute_parts.len() != 2 {
continue;
}
match attribute_parts[0].trim() {
"fill" => {
style.fill = match attribute_parts[1].trim() {
"none" => None,
colour => colour_from_html(colour),
}
}
"stroke" => {
style.stroke = match colour_from_html(attribute_parts[1].trim()) {
Some(c) => c,
None => {
return Err(format!(
"Could not parse colour from {}",
attribute_parts[1].trim()
))
}
}
}
"stroke-width" => {
style.stroke_width = match attribute_parts[1].trim().parse::<f32>() {
Ok(width) => width,
Err(err) => return Err(format!("Could not parse stroke-width: {}", err)),
}
}
"stroke-linecap" => {
style.stroke_linecap = StrokeLineCap::from_str(attribute_parts[1].trim())?
}
"stroke-linejoin" => {
style.stroke_linejoin = StrokeLineJoin::from_str(attribute_parts[1].trim())?
}
"stroke-opacity" => {
style.stroke_width = match attribute_parts[1].trim().parse::<f32>() {
Ok(opacity) => opacity,
Err(err) => return Err(format!("Could not parse stroke-opacity: {}", err)),
}
}
attr => return Err(format!("Unknown attribute {}", attr)),
}
}
Ok(style)
}
}
impl Default for Style {
fn default() -> Self {
Self {
fill: None,
stroke: Color {
r: 0,
g: 0,
b: 0,
a: 255,
},
stroke_width: 1.,
stroke_linecap: StrokeLineCap::default(),
stroke_linejoin: StrokeLineJoin::default(),
stroke_opacity: 1.,
}
}
}
|
