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//!
//! svg related building blocks
//!
use super::*;
/// Create the attribute for a svg polyline or polygon. Used by [`WriteAttr::points_data`].
pub struct PointsBuilder<'a, T: Write> {
    inner: &'a mut T,
}
impl<'a, T: Write> PointsBuilder<'a, T> {
    pub(super) fn new(inner: &'a mut T) -> Result<Self, fmt::Error> {
        write!(inner, " points=\"")?;
        Ok(PointsBuilder { inner })
    }
    pub fn add_point(
        &mut self,
        x: impl fmt::Display,
        y: impl fmt::Display,
    ) -> Result<&mut Self, fmt::Error> {
        write!(self.inner, "{},{} ", x, y)?;
        Ok(self)
    }
    pub(super) fn finish(&'a mut self) -> Result<&'a mut T, fmt::Error> {
        write!(self.inner, "\"")?;
        Ok(self.inner)
    }
}

///
/// Construct and Write a SVG path's data.
///
/// following: [w3 spec](https://www.w3.org/TR/SVG/paths.html#PathDataGeneralInformation)
///
pub enum PathCommand<F: fmt::Display> {
    /// move to
    M(F, F),
    /// relative move to
    M_(F, F),
    /// line to
    L(F, F),
    /// relative line to
    L_(F, F),
    /// horizontal to
    H(F),
    /// relative horizontal to
    H_(F),
    /// vertical to
    V(F),
    /// relative vertical to
    V_(F),
    /// curve to
    C(F, F, F, F, F, F),
    /// relative curve to
    C_(F, F, F, F, F, F),
    /// shorthand curve to
    S(F, F, F, F),
    /// relative shorthand curve to
    S_(F, F, F, F),
    /// quadratic bezier curve to
    Q(F, F, F, F),
    /// relative quadratic bezier curve to
    Q_(F, F, F, F),
    /// shorthand quadratic bezier curve to
    T(F, F),
    /// relative shorthand quadratic bezier curve to
    T_(F, F),
    /// elliptical arc
    A(F, F, F, F, F, F, F),
    /// relative elliptical arc
    A_(F, F, F, F, F, F, F),
}

impl<F: fmt::Display> PathCommand<F> {
    pub fn write<T: fmt::Write>(&self, writer: &mut T) -> fmt::Result {
        use PathCommand::*;
        match self {
            M(x, y) => {
                write!(writer, " M {} {}", x, y)
            }
            M_(x, y) => {
                write!(writer, " m {} {}", x, y)
            }
            L(x, y) => {
                write!(writer, " L {} {}", x, y)
            }
            L_(x, y) => {
                write!(writer, " l {} {}", x, y)
            }
            H(a) => {
                write!(writer, " H {}", a)
            }
            H_(a) => {
                write!(writer, " h {}", a)
            }
            V(a) => {
                write!(writer, " V {}", a)
            }
            V_(a) => {
                write!(writer, " v {}", a)
            }
            C(x1, y1, x2, y2, x, y) => {
                write!(writer, " C {} {}, {} {}, {} {}", x1, y1, x2, y2, x, y)
            }
            C_(dx1, dy1, dx2, dy2, dx, dy) => {
                write!(writer, " c {} {}, {} {}, {} {}", dx1, dy1, dx2, dy2, dx, dy)
            }
            S(x2, y2, x, y) => {
                write!(writer, " S {},{} {} {}", x2, y2, x, y)
            }
            S_(x2, y2, x, y) => {
                write!(writer, " s {},{} {} {}", x2, y2, x, y)
            }
            Q(x1, y1, x, y) => {
                write!(writer, " Q {} {}, {} {}", x1, y1, x, y)
            }
            Q_(dx1, dy1, dx, dy) => {
                write!(writer, " q {} {}, {} {}", dx1, dy1, dx, dy)
            }
            T(x, y) => {
                write!(writer, " T {} {}", x, y)
            }
            T_(x, y) => {
                write!(writer, " t {} {}", x, y)
            }
            A(rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y) => {
                write!(
                    writer,
                    " A {} {} {} {} {} {} {}",
                    rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, x, y
                )
            }
            A_(rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, dx, dy) => {
                write!(
                    writer,
                    " a {} {} {} {} {} {} {}",
                    rx, ry, x_axis_rotation, large_arc_flag, sweep_flag, dx, dy
                )
            }
        }
    }
}

/// Create the attribute for a svg path. Used by [`WriteAttr::path_data`]
pub struct PathBuilder<'a, T> {
    inner: &'a mut T,
}
impl<'a, T: Write> PathBuilder<'a, T> {
    pub(super) fn new(inner: &'a mut T) -> Result<Self, fmt::Error> {
        write!(inner, " d=\"")?;
        Ok(PathBuilder { inner })
    }
    pub fn draw_z(&mut self) -> Result<&mut Self, fmt::Error> {
        write!(self.inner, "Z")?;
        Ok(self)
    }
    pub fn draw<F: fmt::Display>(&mut self, val: PathCommand<F>) -> Result<&mut Self, fmt::Error> {
        val.write(self.inner)?;
        Ok(self)
    }
    pub(super) fn finish(&'a mut self) -> Result<&'a mut T, fmt::Error> {
        write!(self.inner, "\"")?;
        Ok(self.inner)
    }
}