snapr 0.7.1

Library enabling a flexible and frictionless way to render snapshots of maps with overlayed geometries.
Documentation 
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//! Contains [`Drawable`] implementations and [`Styles`](Style) for [`geo::Point`]` primitives.

use std::fmt;

use geo::MapCoords;
use tiny_skia::{FillRule, Paint, Path, PathBuilder, Pixmap, Shader, Stroke, Transform};

use crate::drawing::{
    style::{ColorOptions, Effect, Styleable, Styled},
    Context, Drawable,
};

use super::macros::impl_styled_geo;

/// Represents a _shape_ that can be transformed into a [`Path`] via the [`Shape::to_path`] method.
#[derive(Clone, Debug, PartialEq)]
pub enum Shape {
    Circle { radius: f32 },
}

impl Shape {
    /// Converts the [`Shape`] to a [`Path`] modeling the selected variant.
    pub fn to_path(&self, x: f32, y: f32) -> Result<Path, crate::Error> {
        let mut path_builder = PathBuilder::new();

        match self {
            Self::Circle { radius } => {
                path_builder.push_circle(x, y, *radius);
            }
        }

        path_builder.finish().ok_or(crate::Error::PathConstruction)
    }
}

impl Default for Shape {
    fn default() -> Self {
        Self::Circle { radius: 4.0 }
    }
}

/// Controls how a [`geo::Point`] will be visualized when drawn.
#[derive(Clone, Debug, PartialEq)]
pub enum Representation {
    Shape(Shape),

    #[cfg(feature = "svg")]
    Svg(crate::drawing::svg::Svg),
}

impl Default for Representation {
    fn default() -> Self {
        Self::Shape(Shape::default())
    }
}

/// A [`Style`] that can be applied to [`geo::Point`] primitives.
#[derive(Clone, Default)]
pub struct PointStyle<'a> {
    pub color_options: ColorOptions,
    pub representation: Representation,
    pub effect: Option<Effect<'a, geo::Point<f64>, Self>>,

    #[cfg(feature = "svg")]
    pub label: Option<crate::drawing::svg::Label>,
}

impl<'a> fmt::Debug for PointStyle<'a> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("PointStyle")
            .field("color_options", &self.color_options)
            .field("representation", &self.representation)
            .field("label", &self.label)
            .finish()
    }
}

impl_styled_geo!(
    Point,
    PointStyle<'_>,
    fn draw(&self, pixmap: &mut Pixmap, context: &Context) -> Result<(), crate::Error> {
        let style = match &self.style.effect {
            Some(effect) => {
                &(effect
                    .clone()
                    .apply(self.style.clone(), self.inner, context))
            }

            None => &self.style,
        };

        let point = self
            .inner
            .map_coords(|coord| context.epsg_4326_to_pixel(&coord));

        let shape = match &style.representation {
            Representation::Shape(shape) => shape,

            #[cfg(feature = "svg")]
            Representation::Svg(svg) => {
                let svg = svg.try_as_svg((point.x(), point.y()))?;
                svg.draw(pixmap, context)?;

                return Ok(());
            }
        };

        #[cfg(feature = "tracing")]
        {
            tracing::trace!(position = ?point, "rendering `Point` to `pixmap`");
        }

        let shape = shape.to_path(point.x() as f32, point.y() as f32)?;

        pixmap.fill_path(
            &shape,
            &Paint {
                shader: Shader::SolidColor(style.color_options.foreground),
                anti_alias: style.color_options.anti_alias,
                ..Paint::default()
            },
            FillRule::default(),
            Transform::default(),
            None,
        );

        if let Some(border) = style.color_options.border {
            pixmap.stroke_path(
                &shape,
                &Paint {
                    shader: Shader::SolidColor(style.color_options.background),
                    anti_alias: style.color_options.anti_alias,
                    ..Paint::default()
                },
                &Stroke {
                    width: border,
                    ..Stroke::default()
                },
                Transform::default(),
                None,
            );
        }

        #[cfg(feature = "svg")]
        if let Some(label) = &style.label {
            let svg = label.try_as_svg((point.x(), point.y()))?;
            svg.draw(pixmap, context)?;
        }

        Ok(())
    }
);

impl_styled_geo!(
    MultiPoint,
    PointStyle<'_>,
    fn draw(&self, pixmap: &mut Pixmap, context: &Context) -> Result<(), crate::Error> {
        self.inner
            .iter()
            .map(|point| point.as_styled(self.style.clone()))
            .try_for_each(|point| point.draw(pixmap, context))
    }
);