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use super::ChartContext;
use crate::coord::CoordTranslate;
use crate::drawing::backend::{BackendCoord, DrawingErrorKind};
use crate::drawing::{DrawingAreaErrorKind, DrawingBackend};
use crate::element::{EmptyElement, IntoDynElement, MultiLineText, Rectangle};
use crate::style::{IntoFont, IntoTextStyle, ShapeStyle, SizeDesc, TextStyle, TRANSPARENT};
/// Describes where we want to put the series label
pub enum SeriesLabelPosition {
UpperLeft,
MiddleLeft,
LowerLeft,
UpperMiddle,
MiddleMiddle,
LowerMiddle,
UpperRight,
MiddleRight,
LowerRight,
/// Force the series label drawn at the specific location
Coordinate(i32, i32),
}
impl SeriesLabelPosition {
fn layout_label_area(&self, label_dim: (i32, i32), area_dim: (u32, u32)) -> (i32, i32) {
use SeriesLabelPosition::*;
(
match self {
UpperLeft | MiddleLeft | LowerLeft => 5,
UpperMiddle | MiddleMiddle | LowerMiddle => {
(area_dim.0 as i32 - label_dim.0 as i32) / 2
}
UpperRight | MiddleRight | LowerRight => area_dim.0 as i32 - label_dim.0 as i32 - 5,
Coordinate(x, _) => *x,
},
match self {
UpperLeft | UpperMiddle | UpperRight => 5,
MiddleLeft | MiddleMiddle | MiddleRight => {
(area_dim.1 as i32 - label_dim.1 as i32) / 2
}
LowerLeft | LowerMiddle | LowerRight => area_dim.1 as i32 - label_dim.1 as i32 - 5,
Coordinate(_, y) => *y,
},
)
}
}
/// The struct to specify the series label of a target chart context
pub struct SeriesLabelStyle<'a, 'b, DB: DrawingBackend, CT: CoordTranslate> {
target: &'b mut ChartContext<'a, DB, CT>,
position: SeriesLabelPosition,
legend_area_size: u32,
border_style: ShapeStyle,
background: ShapeStyle,
label_font: Option<TextStyle<'b>>,
margin: u32,
}
impl<'a, 'b, DB: DrawingBackend + 'a, CT: CoordTranslate> SeriesLabelStyle<'a, 'b, DB, CT> {
pub(super) fn new(target: &'b mut ChartContext<'a, DB, CT>) -> Self {
Self {
target,
position: SeriesLabelPosition::MiddleRight,
legend_area_size: 30,
border_style: (&TRANSPARENT).into(),
background: (&TRANSPARENT).into(),
label_font: None,
margin: 10,
}
}
/// Set the series label positioning style
/// `pos` - The positioning style
pub fn position(&mut self, pos: SeriesLabelPosition) -> &mut Self {
self.position = pos;
self
}
/// Set the margin of the series label drawing are
///
/// - `value`: The size specification
pub fn margin<S: SizeDesc>(&mut self, value: S) -> &mut Self {
self.margin = value
.in_pixels(&self.target.plotting_area().dim_in_pixel())
.max(0) as u32;
self
}
/// Set the size of legend area
/// `size` - The size of legend area in pixel
pub fn legend_area_size<S: SizeDesc>(&mut self, size: S) -> &mut Self {
let size = size
.in_pixels(&self.target.plotting_area().dim_in_pixel())
.max(0) as u32;
self.legend_area_size = size;
self
}
/// Set the style of the label series area
/// `style` - The style of the border
pub fn border_style<S: Into<ShapeStyle>>(&mut self, style: S) -> &mut Self {
self.border_style = style.into();
self
}
/// Set the background style
/// `style` - The style of the border
pub fn background_style<S: Into<ShapeStyle>>(&mut self, style: S) -> &mut Self {
self.background = style.into();
self
}
/// Set the series label font
/// `font` - The font
pub fn label_font<F: IntoTextStyle<'b>>(&mut self, font: F) -> &mut Self {
self.label_font = Some(font.into_text_style(&self.target.plotting_area().dim_in_pixel()));
self
}
/// Draw the series label area
pub fn draw(&mut self) -> Result<(), DrawingAreaErrorKind<DB::ErrorType>> {
let drawing_area = self.target.plotting_area().strip_coord_spec();
// TODO: Issue #68 Currently generic font family doesn't load on OSX, change this after the issue
// resolved
let default_font = ("sans-serif", 12).into_font();
let default_style: TextStyle = default_font.into();
let font = {
let mut temp = None;
std::mem::swap(&mut self.label_font, &mut temp);
temp.unwrap_or(default_style)
};
let mut label_element = MultiLineText::<_, &str>::new((0, 0), &font);
let mut funcs = vec![];
for anno in self.target.series_anno.iter() {
let label_text = anno.get_label();
let draw_func = anno.get_draw_func();
if label_text == "" && draw_func.is_none() {
continue;
}
funcs.push(
draw_func.unwrap_or_else(|| &|p: BackendCoord| EmptyElement::at(p).into_dyn()),
);
label_element.push_line(label_text);
}
let (mut w, mut h) = label_element
.estimate_dimension()
.map_err(|e| DrawingAreaErrorKind::BackendError(DrawingErrorKind::FontError(e)))?;
let margin = self.margin as i32;
w += self.legend_area_size as i32 + margin * 2;
h += margin * 2;
let (area_w, area_h) = drawing_area.dim_in_pixel();
let (label_x, label_y) = self.position.layout_label_area((w, h), (area_w, area_h));
label_element.relocate((
label_x + self.legend_area_size as i32 + margin,
label_y + margin,
));
drawing_area.draw(&Rectangle::new(
[(label_x, label_y), (label_x + w, label_y + h)],
self.background.filled(),
))?;
drawing_area.draw(&Rectangle::new(
[(label_x, label_y), (label_x + w, label_y + h)],
self.border_style.clone(),
))?;
drawing_area.draw(&label_element)?;
for (((_, y0), (_, y1)), make_elem) in label_element
.compute_line_layout()
.map_err(|e| DrawingAreaErrorKind::BackendError(DrawingErrorKind::FontError(e)))?
.into_iter()
.zip(funcs.into_iter())
{
let legend_element = make_elem((label_x + margin, (y0 + y1) / 2));
drawing_area.draw(&legend_element)?;
}
Ok(())
}
}
|
