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|
use super::color::{Color, RGBAColor};
use super::font::{FontDesc, FontFamily, FontStyle, FontTransform};
use super::size::{HasDimension, SizeDesc};
use super::BLACK;
/// Text anchor attributes are used to properly position the text.
///
/// # Examples
///
/// In the example below, the text anchor (X) position is `Pos::new(HPos::Right, VPos::Center)`.
/// ```text
/// ***** X
/// ```
/// The position is always relative to the text regardless of its rotation.
/// In the example below, the text has style
/// `style.transform(FontTransform::Rotate90).pos(Pos::new(HPos::Center, VPos::Top))`.
/// ```text
/// *
/// *
/// * X
/// *
/// *
/// ```
pub mod text_anchor {
/// The horizontal position of the anchor point relative to the text.
#[derive(Clone, Copy)]
pub enum HPos {
/// Anchor point is on the left side of the text
Left,
/// Anchor point is on the right side of the text
Right,
/// Anchor point is in the horizontal center of the text
Center,
}
/// The vertical position of the anchor point relative to the text.
#[derive(Clone, Copy)]
pub enum VPos {
/// Anchor point is on the top of the text
Top,
/// Anchor point is in the vertical center of the text
Center,
/// Anchor point is on the bottom of the text
Bottom,
}
/// The text anchor position.
#[derive(Clone, Copy)]
pub struct Pos {
/// The horizontal position of the anchor point
pub h_pos: HPos,
/// The vertical position of the anchor point
pub v_pos: VPos,
}
impl Pos {
/// Create a new text anchor position.
///
/// - `h_pos`: The horizontal position of the anchor point
/// - `v_pos`: The vertical position of the anchor point
/// - **returns** The newly created text anchor position
///
/// ```rust
/// use plotters::style::text_anchor::{Pos, HPos, VPos};
///
/// let pos = Pos::new(HPos::Left, VPos::Top);
/// ```
pub fn new(h_pos: HPos, v_pos: VPos) -> Self {
Pos { h_pos, v_pos }
}
/// Create a default text anchor position (top left).
///
/// - **returns** The default text anchor position
///
/// ```rust
/// use plotters::style::text_anchor::{Pos, HPos, VPos};
///
/// let pos = Pos::default();
/// ```
pub fn default() -> Self {
Pos {
h_pos: HPos::Left,
v_pos: VPos::Top,
}
}
}
}
/// Style of a text
#[derive(Clone)]
pub struct TextStyle<'a> {
/// The font description
pub font: FontDesc<'a>,
/// The text color
pub color: RGBAColor,
/// The anchor point position
pub pos: text_anchor::Pos,
}
pub trait IntoTextStyle<'a> {
fn into_text_style<P: HasDimension>(self, parent: &P) -> TextStyle<'a>;
}
impl<'a> IntoTextStyle<'a> for FontDesc<'a> {
fn into_text_style<P: HasDimension>(self, _: &P) -> TextStyle<'a> {
self.into()
}
}
impl<'a> IntoTextStyle<'a> for TextStyle<'a> {
fn into_text_style<P: HasDimension>(self, _: &P) -> TextStyle<'a> {
self
}
}
impl<'a> IntoTextStyle<'a> for FontFamily<'a> {
fn into_text_style<P: HasDimension>(self, _: &P) -> TextStyle<'a> {
self.into()
}
}
impl<'a, T: SizeDesc> IntoTextStyle<'a> for (&'a str, T) {
fn into_text_style<P: HasDimension>(self, parent: &P) -> TextStyle<'a> {
(self.0, self.1.in_pixels(parent)).into()
}
}
impl<'a, T: SizeDesc> IntoTextStyle<'a> for (FontFamily<'a>, T) {
fn into_text_style<P: HasDimension>(self, parent: &P) -> TextStyle<'a> {
(self.0, self.1.in_pixels(parent)).into()
}
}
impl<'a, T: SizeDesc> IntoTextStyle<'a> for (&'a str, T, FontStyle) {
fn into_text_style<P: HasDimension>(self, parent: &P) -> TextStyle<'a> {
Into::<FontDesc>::into((self.0, self.1.in_pixels(parent), self.2)).into()
}
}
impl<'a, T: SizeDesc> IntoTextStyle<'a> for (FontFamily<'a>, T, FontStyle) {
fn into_text_style<P: HasDimension>(self, parent: &P) -> TextStyle<'a> {
Into::<FontDesc>::into((self.0, self.1.in_pixels(parent), self.2)).into()
}
}
impl<'a> TextStyle<'a> {
/// Sets the color of the style.
///
/// - `color`: The required color
/// - **returns** The up-to-dated text style
///
/// ```rust
/// use plotters::prelude::*;
///
/// let style = TextStyle::from(("sans-serif", 20).into_font()).color(&RED);
/// ```
pub fn color<C: Color>(&self, color: &'a C) -> Self {
Self {
font: self.font.clone(),
color: color.to_rgba(),
pos: self.pos,
}
}
/// Sets the font transformation of the style.
///
/// - `trans`: The required transformation
/// - **returns** The up-to-dated text style
///
/// ```rust
/// use plotters::prelude::*;
///
/// let style = TextStyle::from(("sans-serif", 20).into_font()).transform(FontTransform::Rotate90);
/// ```
pub fn transform(&self, trans: FontTransform) -> Self {
Self {
font: self.font.clone().transform(trans),
color: self.color.clone(),
pos: self.pos,
}
}
/// Sets the anchor position.
///
/// - `pos`: The required anchor position
/// - **returns** The up-to-dated text style
///
/// ```rust
/// use plotters::prelude::*;
/// use plotters::style::text_anchor::{Pos, HPos, VPos};
///
/// let pos = Pos::new(HPos::Left, VPos::Top);
/// let style = TextStyle::from(("sans-serif", 20).into_font()).pos(pos);
/// ```
pub fn pos(&self, pos: text_anchor::Pos) -> Self {
Self {
font: self.font.clone(),
color: self.color.clone(),
pos,
}
}
}
/// Make sure that we are able to automatically copy the `TextStyle`
impl<'a, 'b: 'a> Into<TextStyle<'a>> for &'b TextStyle<'a> {
fn into(self) -> TextStyle<'a> {
self.clone()
}
}
impl<'a, T: Into<FontDesc<'a>>> From<T> for TextStyle<'a> {
fn from(font: T) -> Self {
Self {
font: font.into(),
color: BLACK.to_rgba(),
pos: text_anchor::Pos::default(),
}
}
}
|
