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mod line;
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mod map;
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mod points;
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mod rectangle;
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mod world;
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pub use self::line::Line;
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pub use self::map::{Map, MapResolution};
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pub use self::points::Points;
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pub use self::rectangle::Rectangle;
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use crate::buffer::Buffer;
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use crate::layout::Rect;
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use crate::style::{Color, Style};
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use crate::widgets::{Block, Widget};
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pub const DOTS: [[u16; 2]; 4] = [
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[0x0001, 0x0008],
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[0x0002, 0x0010],
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[0x0004, 0x0020],
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[0x0040, 0x0080],
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];
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pub const BRAILLE_OFFSET: u16 = 0x2800;
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pub const BRAILLE_BLANK: char = '⠀';
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/// Interface for all shapes that may be drawn on a Canvas widget.
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pub trait Shape<'a> {
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/// Returns the color of the shape
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fn color(&self) -> Color;
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/// Returns an iterator over all points of the shape
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fn points(&'a self) -> Box<Iterator<Item = (f64, f64)> + 'a>;
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}
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/// Label to draw some text on the canvas
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pub struct Label<'a> {
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pub x: f64,
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pub y: f64,
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pub text: &'a str,
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pub color: Color,
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}
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struct Layer {
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string: String,
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colors: Vec<Color>,
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}
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struct Grid {
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cells: Vec<u16>,
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colors: Vec<Color>,
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}
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impl Grid {
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fn new(width: usize, height: usize) -> Grid {
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Grid {
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cells: vec![BRAILLE_OFFSET; width * height],
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colors: vec![Color::Reset; width * height],
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}
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}
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fn save(&self) -> Layer {
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Layer {
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string: String::from_utf16(&self.cells).unwrap(),
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colors: self.colors.clone(),
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}
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}
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fn reset(&mut self) {
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for c in &mut self.cells {
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*c = BRAILLE_OFFSET;
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}
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for c in &mut self.colors {
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*c = Color::Reset;
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}
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}
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}
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/// Holds the state of the Canvas when painting to it.
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pub struct Context<'a> {
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width: u16,
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height: u16,
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x_bounds: [f64; 2],
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y_bounds: [f64; 2],
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grid: Grid,
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dirty: bool,
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layers: Vec<Layer>,
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labels: Vec<Label<'a>>,
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}
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impl<'a> Context<'a> {
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/// Draw any object that may implement the Shape trait
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pub fn draw<'b, S>(&mut self, shape: &'b S)
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where
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S: Shape<'b>,
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{
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self.dirty = true;
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let left = self.x_bounds[0];
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let right = self.x_bounds[1];
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let bottom = self.y_bounds[0];
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let top = self.y_bounds[1];
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for (x, y) in shape
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.points()
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.filter(|&(x, y)| !(x <= left || x >= right || y <= bottom || y >= top))
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{
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let dy = ((top - y) * f64::from(self.height - 1) * 4.0 / (top - bottom)) as usize;
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let dx = ((x - left) * f64::from(self.width - 1) * 2.0 / (right - left)) as usize;
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let index = dy / 4 * self.width as usize + dx / 2;
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self.grid.cells[index] |= DOTS[dy % 4][dx % 2];
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self.grid.colors[index] = shape.color();
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}
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}
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/// Go one layer above in the canvas.
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pub fn layer(&mut self) {
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self.layers.push(self.grid.save());
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self.grid.reset();
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self.dirty = false;
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}
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/// Print a string on the canvas at the given position
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pub fn print(&mut self, x: f64, y: f64, text: &'a str, color: Color) {
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self.labels.push(Label { x, y, text, color });
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}
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/// Push the last layer if necessary
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|
|
fn finish(&mut self) {
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|
|
if self.dirty {
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self.layer()
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}
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}
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}
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/// The Canvas widget may be used to draw more detailed figures using braille patterns (each
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|
|
/// cell can have a braille character in 8 different positions).
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|
|
/// # Examples
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///
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|
/// ```
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|
|
/// # use tui::widgets::{Block, Borders};
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|
|
/// # use tui::layout::Rect;
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|
|
/// # use tui::widgets::canvas::{Canvas, Shape, Line, Rectangle, Map, MapResolution};
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|
|
/// # use tui::style::Color;
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|
|
/// # fn main() {
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|
|
/// Canvas::default()
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|
|
/// .block(Block::default().title("Canvas").borders(Borders::ALL))
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|
/// .x_bounds([-180.0, 180.0])
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|
|
/// .y_bounds([-90.0, 90.0])
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|
|
/// .paint(|ctx| {
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|
|
/// ctx.draw(&Map {
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|
|
/// resolution: MapResolution::High,
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|
|
/// color: Color::White
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|
/// });
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|
|
/// ctx.layer();
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|
|
/// ctx.draw(&Line {
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|
|
/// x1: 0.0,
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|
|
/// y1: 10.0,
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|
/// x2: 10.0,
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|
/// y2: 10.0,
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|
|
/// color: Color::White,
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|
/// });
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|
|
/// ctx.draw(&Rectangle {
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|
|
/// rect: Rect {
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|
|
/// x: 10,
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|
/// y: 20,
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|
|
/// width: 10,
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|
|
/// height: 10,
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|
|
/// },
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|
|
/// color: Color::Red
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|
|
/// });
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|
|
/// });
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|
|
/// # }
|
|
|
|
|
/// ```
|
|
|
|
|
pub struct Canvas<'a, F>
|
|
|
|
|
where
|
|
|
|
|
F: Fn(&mut Context),
|
|
|
|
|
{
|
|
|
|
|
block: Option<Block<'a>>,
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|
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|
|
x_bounds: [f64; 2],
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|
|
y_bounds: [f64; 2],
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|
|
painter: Option<F>,
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|
|
background_color: Color,
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|
|
}
|
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|
|
|
impl<'a, F> Default for Canvas<'a, F>
|
|
|
|
|
where
|
|
|
|
|
F: Fn(&mut Context),
|
|
|
|
|
{
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|
|
fn default() -> Canvas<'a, F> {
|
|
|
|
|
Canvas {
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|
|
block: None,
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|
|
x_bounds: [0.0, 0.0],
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|
|
y_bounds: [0.0, 0.0],
|
|
|
|
|
painter: None,
|
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|
|
|
background_color: Color::Reset,
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl<'a, F> Canvas<'a, F>
|
|
|
|
|
where
|
|
|
|
|
F: Fn(&mut Context),
|
|
|
|
|
{
|
|
|
|
|
pub fn block(mut self, block: Block<'a>) -> Canvas<'a, F> {
|
|
|
|
|
self.block = Some(block);
|
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|
|
|
self
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|
|
|
|
}
|
|
|
|
|
pub fn x_bounds(mut self, bounds: [f64; 2]) -> Canvas<'a, F> {
|
|
|
|
|
self.x_bounds = bounds;
|
|
|
|
|
self
|
|
|
|
|
}
|
|
|
|
|
pub fn y_bounds(mut self, bounds: [f64; 2]) -> Canvas<'a, F> {
|
|
|
|
|
self.y_bounds = bounds;
|
|
|
|
|
self
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// Store the closure that will be used to draw to the Canvas
|
|
|
|
|
pub fn paint(mut self, f: F) -> Canvas<'a, F> {
|
|
|
|
|
self.painter = Some(f);
|
|
|
|
|
self
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|
|
|
|
}
|
|
|
|
|
|
|
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|
|
pub fn background_color(mut self, color: Color) -> Canvas<'a, F> {
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|
|
|
self.background_color = color;
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|
|
|
self
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl<'a, F> Widget for Canvas<'a, F>
|
|
|
|
|
where
|
|
|
|
|
F: Fn(&mut Context),
|
|
|
|
|
{
|
|
|
|
|
fn draw(&mut self, area: Rect, buf: &mut Buffer) {
|
|
|
|
|
let canvas_area = match self.block {
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|
|
|
|
Some(ref mut b) => {
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|
|
|
b.draw(area, buf);
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|
|
|
b.inner(area)
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|
|
|
}
|
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|
|
|
None => area,
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|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
let width = canvas_area.width as usize;
|
|
|
|
|
let height = canvas_area.height as usize;
|
|
|
|
|
|
|
|
|
|
if let Some(ref painter) = self.painter {
|
|
|
|
|
// Create a blank context that match the size of the terminal
|
|
|
|
|
let mut ctx = Context {
|
|
|
|
|
x_bounds: self.x_bounds,
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|
|
|
y_bounds: self.y_bounds,
|
|
|
|
|
width: canvas_area.width,
|
|
|
|
|
height: canvas_area.height,
|
|
|
|
|
grid: Grid::new(width, height),
|
|
|
|
|
dirty: false,
|
|
|
|
|
layers: Vec::new(),
|
|
|
|
|
labels: Vec::new(),
|
|
|
|
|
};
|
|
|
|
|
// Paint to this context
|
|
|
|
|
painter(&mut ctx);
|
|
|
|
|
ctx.finish();
|
|
|
|
|
|
|
|
|
|
// Retreive painted points for each layer
|
|
|
|
|
for layer in ctx.layers {
|
|
|
|
|
for (i, (ch, color)) in layer
|
|
|
|
|
.string
|
|
|
|
|
.chars()
|
|
|
|
|
.zip(layer.colors.into_iter())
|
|
|
|
|
.enumerate()
|
|
|
|
|
{
|
|
|
|
|
if ch != BRAILLE_BLANK {
|
|
|
|
|
let (x, y) = (i % width, i / width);
|
|
|
|
|
buf.get_mut(x as u16 + canvas_area.left(), y as u16 + canvas_area.top())
|
|
|
|
|
.set_char(ch)
|
|
|
|
|
.set_fg(color)
|
|
|
|
|
.set_bg(self.background_color);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Finally draw the labels
|
|
|
|
|
let style = Style::default().bg(self.background_color);
|
|
|
|
|
for label in ctx.labels.iter().filter(|l| {
|
|
|
|
|
!(l.x < self.x_bounds[0]
|
|
|
|
|
|| l.x > self.x_bounds[1]
|
|
|
|
|
|| l.y < self.y_bounds[0]
|
|
|
|
|
|| l.y > self.y_bounds[1])
|
|
|
|
|
}) {
|
|
|
|
|
let dy = ((self.y_bounds[1] - label.y) * f64::from(canvas_area.height - 1)
|
|
|
|
|
/ (self.y_bounds[1] - self.y_bounds[0])) as u16;
|
|
|
|
|
let dx = ((label.x - self.x_bounds[0]) * f64::from(canvas_area.width - 1)
|
|
|
|
|
/ (self.x_bounds[1] - self.x_bounds[0])) as u16;
|
|
|
|
|
buf.set_string(
|
|
|
|
|
dx + canvas_area.left(),
|
|
|
|
|
dy + canvas_area.top(),
|
|
|
|
|
label.text,
|
|
|
|
|
style.fg(label.color),
|
|
|
|
|
);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|