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use std::cmp::min;
use crate::buffer::Buffer;
use crate::layout::Rect;
use crate::style::Style;
use crate::symbols::bar;
use crate::widgets::{Block, Widget};
pub struct Sparkline<'a> {
block: Option<Block<'a>>,
style: Style,
data: &'a [u64],
max: Option<u64>,
}
impl<'a> Default for Sparkline<'a> {
fn default() -> Sparkline<'a> {
Sparkline {
block: None,
style: Default::default(),
data: &[],
max: None,
}
}
}
impl<'a> Sparkline<'a> {
pub fn block(mut self, block: Block<'a>) -> Sparkline<'a> {
self.block = Some(block);
self
}
pub fn style(mut self, style: Style) -> Sparkline<'a> {
self.style = style;
self
}
pub fn data(mut self, data: &'a [u64]) -> Sparkline<'a> {
self.data = data;
self
}
pub fn max(mut self, max: u64) -> Sparkline<'a> {
self.max = Some(max);
self
}
}
impl<'a> Widget for Sparkline<'a> {
fn draw(&mut self, area: Rect, buf: &mut Buffer) {
let spark_area = match self.block {
Some(ref mut b) => {
b.draw(area, buf);
b.inner(area)
}
None => area,
};
if spark_area.height < 1 {
return;
}
let max = match self.max {
Some(v) => v,
None => *self.data.iter().max().unwrap_or(&1u64),
};
let max_index = min(spark_area.width as usize, self.data.len());
let mut data = self
.data
.iter()
.take(max_index)
.map(|e| {
if max != 0 {
e * u64::from(spark_area.height) * 8 / max
} else {
0
}
})
.collect::<Vec<u64>>();
for j in (0..spark_area.height).rev() {
for (i, d) in data.iter_mut().enumerate() {
let symbol = match *d {
0 => " ",
1 => bar::ONE_EIGHTH,
2 => bar::ONE_QUATER,
3 => bar::THREE_EIGHTHS,
4 => bar::HALF,
5 => bar::FIVE_EIGHTHS,
6 => bar::THREE_QUATERS,
7 => bar::SEVEN_EIGHTHS,
_ => bar::FULL,
};
buf.get_mut(spark_area.left() + i as u16, spark_area.top() + j)
.set_symbol(symbol)
.set_fg(self.style.fg)
.set_bg(self.style.bg);
if *d > 8 {
*d -= 8;
} else {
*d = 0;
}
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_does_not_panic_if_max_is_zero() {
let mut widget = Sparkline::default().data(&[0, 0, 0]);
let area = Rect::new(0, 0, 3, 1);
let mut buffer = Buffer::empty(area);
widget.draw(area, &mut buffer);
}
#[test]
fn it_does_not_panic_if_max_is_set_to_zero() {
let mut widget = Sparkline::default().data(&[0, 1, 2]).max(0);
let area = Rect::new(0, 0, 3, 1);
let mut buffer = Buffer::empty(area);
widget.draw(area, &mut buffer);
}
}