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|
use plotters::drawing::{
backend::{BackendStyle, DrawingErrorKind},
DrawingBackend,
};
use plotters::prelude::*;
use plotters::style::text_anchor::{HPos, VPos};
use plotters::style::RGBAColor;
use std::error::Error;
#[derive(Copy, Clone)]
enum PixelState {
Empty,
HLine,
VLine,
Cross,
Pixel,
Text(char),
Circle(bool),
}
impl PixelState {
fn to_char(self) -> char {
match self {
Self::Empty => ' ',
Self::HLine => '-',
Self::VLine => '|',
Self::Cross => '+',
Self::Pixel => '.',
Self::Text(c) => c,
Self::Circle(filled) => {
if filled {
'@'
} else {
'O'
}
}
}
}
fn update(&mut self, new_state: PixelState) {
let next_state = match (*self, new_state) {
(Self::HLine, Self::VLine) => Self::Cross,
(Self::VLine, Self::HLine) => Self::Cross,
(_, Self::Circle(what)) => Self::Circle(what),
(Self::Circle(what), _) => Self::Circle(what),
(_, Self::Pixel) => Self::Pixel,
(Self::Pixel, _) => Self::Pixel,
(_, new) => new,
};
*self = next_state;
}
}
pub struct TextDrawingBackend(Vec<PixelState>);
impl DrawingBackend for TextDrawingBackend {
type ErrorType = std::io::Error;
fn get_size(&self) -> (u32, u32) {
(100, 30)
}
fn ensure_prepared(&mut self) -> Result<(), DrawingErrorKind<std::io::Error>> {
Ok(())
}
fn present(&mut self) -> Result<(), DrawingErrorKind<std::io::Error>> {
for r in 0..30 {
let mut buf = String::new();
for c in 0..100 {
buf.push(self.0[r * 100 + c].to_char());
}
println!("{}", buf);
}
Ok(())
}
fn draw_pixel(
&mut self,
pos: (i32, i32),
color: &RGBAColor,
) -> Result<(), DrawingErrorKind<std::io::Error>> {
if color.alpha() > 0.3 {
self.0[(pos.1 * 100 + pos.0) as usize].update(PixelState::Pixel);
}
Ok(())
}
fn draw_line<S: BackendStyle>(
&mut self,
from: (i32, i32),
to: (i32, i32),
style: &S,
) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
if from.0 == to.0 {
let x = from.0;
let y0 = from.1.min(to.1);
let y1 = from.1.max(to.1);
for y in y0..y1 {
self.0[(y * 100 + x) as usize].update(PixelState::VLine);
}
return Ok(());
}
if from.1 == to.1 {
let y = from.1;
let x0 = from.0.min(to.0);
let x1 = from.0.max(to.0);
for x in x0..x1 {
self.0[(y * 100 + x) as usize].update(PixelState::HLine);
}
return Ok(());
}
plotters::drawing::rasterizer::draw_line(self, from, to, style)
}
fn estimate_text_size<'a>(
&self,
text: &str,
_font: &FontDesc<'a>,
) -> Result<(u32, u32), DrawingErrorKind<Self::ErrorType>> {
Ok((text.len() as u32, 1))
}
fn draw_text(
&mut self,
text: &str,
style: &TextStyle,
pos: (i32, i32),
) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
let (width, height) = self.estimate_text_size(text, &style.font)?;
let (width, height) = (width as i32, height as i32);
let dx = match style.pos.h_pos {
HPos::Left => 0,
HPos::Right => -width,
HPos::Center => -width / 2,
};
let dy = match style.pos.v_pos {
VPos::Top => 0,
VPos::Center => -height / 2,
VPos::Bottom => -height,
};
let offset = (pos.1 + dy).max(0) * 100 + (pos.0 + dx).max(0);
for (idx, chr) in (offset..).zip(text.chars()) {
self.0[idx as usize].update(PixelState::Text(chr));
}
Ok(())
}
}
fn draw_chart<DB: DrawingBackend>(
b: DrawingArea<DB, plotters::coord::Shift>,
) -> Result<(), Box<dyn Error>>
where
DB::ErrorType: 'static,
{
let mut chart = ChartBuilder::on(&b)
.margin(1)
.caption("Sine and Cosine", ("sans-serif", (10).percent_height()))
.set_label_area_size(LabelAreaPosition::Left, (5i32).percent_width())
.set_label_area_size(LabelAreaPosition::Bottom, (10i32).percent_height())
.build_ranged(-std::f64::consts::PI..std::f64::consts::PI, -1.2..1.2)?;
chart
.configure_mesh()
.disable_x_mesh()
.disable_y_mesh()
.draw()?;
chart.draw_series(LineSeries::new(
(-314..314).map(|x| x as f64 / 100.0).map(|x| (x, x.sin())),
&RED,
))?;
chart.draw_series(LineSeries::new(
(-314..314).map(|x| x as f64 / 100.0).map(|x| (x, x.cos())),
&RED,
))?;
b.present()?;
Ok(())
}
fn main() -> Result<(), Box<dyn Error>> {
draw_chart(TextDrawingBackend(vec![PixelState::Empty; 5000]).into_drawing_area())?;
let b = BitMapBackend::new("plotters-doc-data/console-example.png", (1024, 768))
.into_drawing_area();
b.fill(&WHITE)?;
draw_chart(b)?;
Ok(())
}
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