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use std::cmp::max;
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use unicode_width::UnicodeWidthStr;
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use widgets::{Widget, Block, Canvas, Points};
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use buffer::Buffer;
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use layout::Rect;
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use style::Color;
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use symbols;
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pub struct Axis<'a> {
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title: Option<&'a str>,
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title_color: Color,
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bounds: [f64; 2],
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labels: Option<&'a [&'a str]>,
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labels_color: Color,
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color: Color,
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}
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impl<'a> Default for Axis<'a> {
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fn default() -> Axis<'a> {
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Axis {
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title: None,
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title_color: Color::Reset,
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bounds: [0.0, 0.0],
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labels: None,
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labels_color: Color::Reset,
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color: Color::Reset,
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}
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}
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}
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impl<'a> Axis<'a> {
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pub fn title(mut self, title: &'a str) -> Axis<'a> {
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self.title = Some(title);
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self
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}
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pub fn title_color(mut self, color: Color) -> Axis<'a> {
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self.title_color = color;
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self
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}
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pub fn bounds(mut self, bounds: [f64; 2]) -> Axis<'a> {
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self.bounds = bounds;
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self
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}
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pub fn labels(mut self, labels: &'a [&'a str]) -> Axis<'a> {
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self.labels = Some(labels);
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self
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}
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pub fn labels_color(mut self, color: Color) -> Axis<'a> {
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self.labels_color = color;
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self
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}
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pub fn color(mut self, color: Color) -> Axis<'a> {
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self.color = color;
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self
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}
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}
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pub enum Marker {
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Dot,
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Braille,
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}
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pub struct Dataset<'a> {
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data: &'a [(f64, f64)],
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marker: Marker,
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color: Color,
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}
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impl<'a> Default for Dataset<'a> {
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fn default() -> Dataset<'a> {
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Dataset {
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data: &[],
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marker: Marker::Dot,
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color: Color::Reset,
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}
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}
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}
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impl<'a> Dataset<'a> {
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pub fn data(mut self, data: &'a [(f64, f64)]) -> Dataset<'a> {
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self.data = data;
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self
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}
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pub fn marker(mut self, marker: Marker) -> Dataset<'a> {
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self.marker = marker;
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self
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}
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pub fn color(mut self, color: Color) -> Dataset<'a> {
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self.color = color;
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self
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}
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}
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#[derive(Debug)]
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struct ChartLayout {
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legend_x: Option<(u16, u16)>,
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legend_y: Option<(u16, u16)>,
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label_x: Option<u16>,
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label_y: Option<u16>,
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axis_x: Option<u16>,
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axis_y: Option<u16>,
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graph_area: Rect,
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}
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impl Default for ChartLayout {
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fn default() -> ChartLayout {
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ChartLayout {
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legend_x: None,
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legend_y: None,
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label_x: None,
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label_y: None,
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axis_x: None,
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axis_y: None,
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graph_area: Rect::default(),
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}
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}
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}
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pub struct Chart<'a> {
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block: Option<Block<'a>>,
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x_axis: Axis<'a>,
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y_axis: Axis<'a>,
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datasets: &'a [Dataset<'a>],
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bg: Color,
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}
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impl<'a> Default for Chart<'a> {
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fn default() -> Chart<'a> {
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Chart {
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block: None,
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x_axis: Axis::default(),
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y_axis: Axis::default(),
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bg: Color::Reset,
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datasets: &[],
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}
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}
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}
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impl<'a> Chart<'a> {
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pub fn block(&'a mut self, block: Block<'a>) -> &mut Chart<'a> {
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self.block = Some(block);
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self
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}
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pub fn bg(&mut self, bg: Color) -> &mut Chart<'a> {
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self.bg = bg;
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self
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}
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pub fn x_axis(&mut self, axis: Axis<'a>) -> &mut Chart<'a> {
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self.x_axis = axis;
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self
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}
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pub fn y_axis(&mut self, axis: Axis<'a>) -> &mut Chart<'a> {
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self.y_axis = axis;
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self
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}
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pub fn datasets(&mut self, datasets: &'a [Dataset<'a>]) -> &mut Chart<'a> {
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self.datasets = datasets;
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self
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}
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fn layout(&self, area: &Rect) -> ChartLayout {
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let mut layout = ChartLayout::default();
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if area.height == 0 || area.width == 0 {
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return layout;
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}
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let mut x = area.left();
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let mut y = area.bottom() - 1;
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if self.x_axis.labels.is_some() && y > area.top() {
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layout.label_x = Some(y);
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y -= 1;
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}
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if let Some(labels) = self.y_axis.labels {
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let max_width = labels.iter().fold(0, |acc, l| max(l.width(), acc)) as u16;
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if x + max_width < area.right() {
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layout.label_y = Some(x);
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x += max_width;
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}
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}
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if self.x_axis.labels.is_some() && y > area.top() {
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layout.axis_x = Some(y);
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y -= 1;
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}
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if self.y_axis.labels.is_some() && x + 1 < area.right() {
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layout.axis_y = Some(x);
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x += 1;
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}
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if x < area.right() && y > 1 {
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layout.graph_area = Rect::new(x, area.top(), area.right() - x, y - area.top() + 1);
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}
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if let Some(title) = self.x_axis.title {
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let w = title.width() as u16;
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if w < layout.graph_area.width && layout.graph_area.height > 2 {
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layout.legend_x = Some((x + layout.graph_area.width - w, y));
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}
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}
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if let Some(title) = self.y_axis.title {
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let w = title.width() as u16;
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if w + 1 < layout.graph_area.width && layout.graph_area.height > 2 {
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layout.legend_y = Some((x + 1, area.top()));
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}
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}
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layout
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}
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}
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impl<'a> Widget for Chart<'a> {
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fn buffer(&self, area: &Rect, buf: &mut Buffer) {
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let chart_area = match self.block {
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Some(ref b) => {
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b.buffer(area, buf);
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b.inner(area)
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}
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None => *area,
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};
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let layout = self.layout(&chart_area);
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let graph_area = layout.graph_area;
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if graph_area.width == 0 || graph_area.height == 0 {
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return;
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}
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if let Some((x, y)) = layout.legend_x {
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let title = self.x_axis.title.unwrap();
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buf.set_string(x, y, title, self.x_axis.title_color, self.bg);
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}
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if let Some((x, y)) = layout.legend_y {
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let title = self.y_axis.title.unwrap();
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buf.set_string(x, y, title, self.y_axis.title_color, self.bg);
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}
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if let Some(y) = layout.label_x {
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let labels = self.x_axis.labels.unwrap();
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let total_width = labels.iter().fold(0, |acc, l| l.width() + acc) as u16;
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let labels_len = labels.len() as u16;
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if total_width < graph_area.width && labels_len > 1 {
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for (i, label) in labels.iter().enumerate() {
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buf.set_string(graph_area.left() +
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i as u16 * (graph_area.width - 1) / (labels_len - 1) -
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label.width() as u16,
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y,
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label,
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self.x_axis.labels_color,
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self.bg);
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}
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}
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}
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if let Some(x) = layout.label_y {
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let labels = self.y_axis.labels.unwrap();
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let labels_len = labels.len() as u16;
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if labels_len > 1 {
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for (i, label) in labels.iter().enumerate() {
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buf.set_string(x,
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graph_area.bottom() -
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i as u16 * (graph_area.height - 1) / (labels_len - 1),
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label,
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self.y_axis.labels_color,
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self.bg);
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}
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}
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}
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if let Some(y) = layout.axis_x {
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for x in graph_area.left()..graph_area.right() {
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buf.set_cell(x, y, symbols::line::HORIZONTAL, self.x_axis.color, self.bg);
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}
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}
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if let Some(x) = layout.axis_y {
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for y in graph_area.top()..graph_area.bottom() {
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buf.set_cell(x, y, symbols::line::VERTICAL, self.y_axis.color, self.bg);
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}
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}
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if let Some(y) = layout.axis_x {
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if let Some(x) = layout.axis_y {
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buf.set_cell(x, y, symbols::line::BOTTOM_LEFT, self.x_axis.color, self.bg);
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}
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}
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for dataset in self.datasets {
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match dataset.marker {
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Marker::Dot => {
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for &(x, y) in dataset.data.iter() {
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if x < self.x_axis.bounds[0] || x > self.x_axis.bounds[1] ||
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y < self.y_axis.bounds[0] ||
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y > self.y_axis.bounds[1] {
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continue;
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}
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let dy = (self.y_axis.bounds[1] - y) * graph_area.height as f64 /
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(self.y_axis.bounds[1] - self.y_axis.bounds[0]);
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let dx = (self.x_axis.bounds[1] - x) * graph_area.width as f64 /
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(self.x_axis.bounds[1] - self.x_axis.bounds[0]);
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buf.set_cell(dx as u16 + graph_area.left(),
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dy as u16 + graph_area.top(),
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symbols::BLACK_CIRCLE,
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dataset.color,
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self.bg);
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}
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}
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Marker::Braille => {
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Canvas::default()
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.x_bounds(self.x_axis.bounds)
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.y_bounds(self.y_axis.bounds)
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.shapes(&[&Points {
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coords: dataset.data,
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color: dataset.color,
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}])
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.buffer(&graph_area, buf);
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}
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}
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}
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}
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}
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