egui-treeize 0.1.1

Tree-like graph visualization for egui
Documentation 
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use egui::{Painter, Rect, Style, Vec2, emath::Rot2, vec2};

use super::TreeizeStyle;

///Grid background pattern.
///Use `TreeizeStyle::background_pattern_stroke` for change stroke options
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "egui-probe", derive(egui_probe::EguiProbe))]
pub struct Grid {
  /// Spacing between grid lines.
  pub spacing: Vec2,

  /// Angle of the grid.
  #[cfg_attr(feature = "egui-probe", egui_probe(as egui_probe::angle))]
  pub angle: f32,
}

const DEFAULT_GRID_SPACING: Vec2 = vec2(50.0, 50.0);
macro_rules! default_grid_spacing {
  () => {
    stringify!(vec2(50.0, 50.0))
  };
}

const DEFAULT_GRID_ANGLE: f32 = 1.0;
macro_rules! default_grid_angle {
  () => {
    stringify!(1.0)
  };
}

impl Default for Grid {
  fn default() -> Self {
    Self { spacing: DEFAULT_GRID_SPACING, angle: DEFAULT_GRID_ANGLE }
  }
}

impl Grid {
  /// Create new grid with given spacing and angle.
  #[must_use]
  pub const fn new(spacing: Vec2, angle: f32) -> Self {
    Self { spacing, angle }
  }

  fn draw(&self, viewport: &Rect, treeize_style: &TreeizeStyle, style: &Style, painter: &Painter) {
    let bg_stroke = treeize_style.get_bg_pattern_stroke(style);

    let spacing = vec2(self.spacing.x.max(1.0), self.spacing.y.max(1.0));

    let rot = Rot2::from_angle(self.angle);
    let rot_inv = rot.inverse();

    let pattern_bounds = viewport.rotate_bb(rot_inv);

    let min_x = (pattern_bounds.min.x / spacing.x).ceil();
    let max_x = (pattern_bounds.max.x / spacing.x).floor();

    #[allow(clippy::cast_possible_truncation)]
    for x in 0..=f32::ceil(max_x - min_x) as i64 {
      #[allow(clippy::cast_precision_loss)]
      let x = (x as f32 + min_x) * spacing.x;

      let top = (rot * vec2(x, pattern_bounds.min.y)).to_pos2();
      let bottom = (rot * vec2(x, pattern_bounds.max.y)).to_pos2();

      painter.line_segment([top, bottom], bg_stroke);
    }

    let min_y = (pattern_bounds.min.y / spacing.y).ceil();
    let max_y = (pattern_bounds.max.y / spacing.y).floor();

    #[allow(clippy::cast_possible_truncation)]
    for y in 0..=f32::ceil(max_y - min_y) as i64 {
      #[allow(clippy::cast_precision_loss)]
      let y = (y as f32 + min_y) * spacing.y;

      let top = (rot * vec2(pattern_bounds.min.x, y)).to_pos2();
      let bottom = (rot * vec2(pattern_bounds.max.x, y)).to_pos2();

      painter.line_segment([top, bottom], bg_stroke);
    }
  }
}

/// Background pattern show beneath nodes and wires.
#[derive(Clone, Copy, Debug, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[cfg_attr(feature = "egui-probe", derive(egui_probe::EguiProbe))]
pub enum BackgroundPattern {
  /// No pattern.
  NoPattern,

  /// Linear grid.
  #[cfg_attr(feature = "egui-probe", egui_probe(transparent))]
  Grid(Grid),
}

impl Default for BackgroundPattern {
  fn default() -> Self {
    BackgroundPattern::new()
  }
}

impl BackgroundPattern {
  /// Create new background pattern with default values.
  ///
  /// Default patter is `Grid` with spacing - `
  #[doc = default_grid_spacing!()]
  /// ` and angle - `
  #[doc = default_grid_angle!()]
  /// ` radian.
  #[must_use]
  pub const fn new() -> Self {
    Self::Grid(Grid::new(DEFAULT_GRID_SPACING, DEFAULT_GRID_ANGLE))
  }

  /// Create new grid background pattern with given spacing and angle.
  #[must_use]
  pub const fn grid(spacing: Vec2, angle: f32) -> Self {
    Self::Grid(Grid::new(spacing, angle))
  }

  /// Draws background pattern.
  pub fn draw(
    &self,
    viewport: &Rect,
    treeize_style: &TreeizeStyle,
    style: &Style,
    painter: &Painter,
  ) {
    match self {
      BackgroundPattern::Grid(g) => g.draw(viewport, treeize_style, style, painter),
      BackgroundPattern::NoPattern => {}
    }
  }
}