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//! Rendering context - tracks state during rendering
use std::collections::HashMap;
use crate::ast::Direction;
use crate::types::{EvalValue, Length as Inches};
use super::expand_object_bounds;
use super::types::*;
/// Rendering context
pub struct RenderContext {
/// Current direction
pub direction: Direction,
/// Current position (where the next object will be placed)
pub position: PointIn,
/// Objects with explicit names (e.g., `C1: circle`)
/// cref: pik_find_byname (pikchr.c:4027-4032) - first pass looks for zName match
pub explicit_names: HashMap<String, RenderedObject>,
/// Objects with names derived from text content (e.g., `circle "C0"`)
/// cref: pik_find_byname (pikchr.c:4034-4044) - second pass looks for text match
pub text_names: HashMap<String, RenderedObject>,
/// All objects in order
pub object_list: Vec<RenderedObject>,
/// Variables (typed: lengths, scalars, colors)
pub variables: HashMap<String, EvalValue>,
/// Bounding box of all objects
pub bounds: BoundingBox,
/// Current object being constructed (for `this` keyword support)
pub current_object: Option<RenderedObject>,
/// Macro definitions (name -> body)
pub macros: HashMap<String, String>,
/// Named positions (e.g., `OUT: 6.3in right of previous.e`)
/// cref: Labeled positions are stored separately from objects
pub named_positions: HashMap<String, PointIn>,
}
impl Default for RenderContext {
fn default() -> Self {
let mut ctx = Self {
direction: Direction::Right,
position: pin(0.0, 0.0),
explicit_names: HashMap::new(),
text_names: HashMap::new(),
object_list: Vec::new(),
variables: HashMap::new(),
bounds: BoundingBox::new(),
current_object: None,
macros: HashMap::new(),
named_positions: HashMap::new(),
};
ctx.init_builtin_variables();
ctx
}
}
impl RenderContext {
pub fn new() -> Self {
Self::default()
}
fn init_builtin_variables(&mut self) {
// Built-in variables mirror pikchr.c aBuiltin[]
// These are the default values that should be available in all pikchr scripts
macro_rules! builtin_vars {
($($name:ident => $value:expr),* $(,)?) => {
$(
self.variables.insert(stringify!($name).to_string(), $value);
)*
};
}
// Built-in variables mirror pikchr.c aBuiltin[]
// Names must match C exactly for compatibility
builtin_vars! {
// Arc
arcrad => EvalValue::Length(Inches::from(0.25)),
// Arrow
arrowht => EvalValue::Length(Inches::from(0.08)), // C name
arrowwid => EvalValue::Length(Inches::from(0.06)),
// Box
boxht => EvalValue::Length(Inches::from(0.5)), // C name
boxwid => EvalValue::Length(Inches::from(0.75)), // C name
boxrad => EvalValue::Length(Inches::from(0.0)),
// Character/text metrics
charht => EvalValue::Scalar(0.14),
charwid => EvalValue::Scalar(0.08),
// Circle
circlerad => EvalValue::Length(Inches::from(0.25)),
// Cylinder
cylht => EvalValue::Length(Inches::from(0.5)),
cylwid => EvalValue::Length(Inches::from(0.75)),
cylrad => EvalValue::Length(Inches::from(0.075)),
// Dash
dashwid => EvalValue::Length(Inches::from(0.05)),
// Diamond
diamondht => EvalValue::Length(Inches::from(0.75)), // C name
diamondwid => EvalValue::Length(Inches::from(1.0)), // C name
// Dot
dotrad => EvalValue::Length(Inches::from(0.015)), // cref: pikchr.c:3669
// Ellipse
ellipseht => EvalValue::Length(Inches::from(0.5)),
ellipsewid => EvalValue::Length(Inches::from(0.75)),
// File
fileht => EvalValue::Length(Inches::from(0.75)), // C name
filewid => EvalValue::Length(Inches::from(0.5)), // C name
filerad => EvalValue::Length(Inches::from(0.15)),
// Line
lineht => EvalValue::Length(Inches::from(0.5)),
linewid => EvalValue::Length(Inches::from(0.5)),
linerad => EvalValue::Length(Inches::from(0.0)),
// Move
movewid => EvalValue::Length(Inches::from(0.5)),
// Oval
ovalht => EvalValue::Length(Inches::from(0.5)), // C name
ovalwid => EvalValue::Length(Inches::from(1.0)), // C name
// Scale
scale => EvalValue::Scalar(1.0),
fontscale => EvalValue::Scalar(1.0), // cref: pikchr.c aBuiltin[] - global font scale multiplier
// Text
textht => EvalValue::Length(Inches::from(0.5)),
textwid => EvalValue::Length(Inches::from(0.75)),
// Thickness/stroke
thickness => EvalValue::Length(Inches::from(0.015)),
}
}
/// Get the last rendered object
pub fn last_object(&self) -> Option<&RenderedObject> {
self.object_list.last()
}
/// Get an object by name
///
/// cref: pik_find_byname (pikchr.c:4014-4047)
/// First looks for explicitly named objects (e.g., `C1: circle`)
/// Then falls back to objects with matching text content (e.g., `circle "C0"`)
pub fn get_object(&self, name: &str) -> Option<&RenderedObject> {
// First pass: look for explicitly tagged objects
if let Some(obj) = self.explicit_names.get(name) {
return Some(obj);
}
// Second pass: look for objects with matching text content
self.text_names.get(name)
}
/// Get the nth object of a class (1-indexed, from start)
pub fn get_nth_object(&self, n: usize, class: Option<ClassName>) -> Option<&RenderedObject> {
let filtered: Vec<_> = self
.object_list
.iter()
.filter(|o| class.map(|c| o.class() == c).unwrap_or(true))
.collect();
filtered.get(n.saturating_sub(1)).copied()
}
/// Get the nth last object of a class (1-indexed, from end)
/// e.g., "3rd last box" gets the 3rd box counting from the end
pub fn get_nth_last_object(
&self,
n: usize,
class: Option<ClassName>,
) -> Option<&RenderedObject> {
let filtered: Vec<_> = self
.object_list
.iter()
.filter(|o| class.map(|c| o.class() == c).unwrap_or(true))
.collect();
let len = filtered.len();
if n > len || n == 0 {
return None;
}
filtered.get(len - n).copied()
}
/// Get the last object of a class
pub fn get_last_object(&self, class: Option<ClassName>) -> Option<&RenderedObject> {
self.object_list
.iter()
.rev()
.find(|o| class.map(|c| o.class() == c).unwrap_or(true))
}
/// Get a scalar value from variables, with fallback
// cref: pik_value (pikchr.c:6102)
pub fn get_scalar(&self, name: &str, default: f64) -> f64 {
self.variables
.get(name)
.map(|v| v.as_scalar())
.unwrap_or(default)
}
/// Get a length value from variables, with fallback
/// cref: pik_value (pikchr.c:6102)
/// Accepts both Length and Scalar values - scalars are interpreted as inches
pub fn get_length(&self, name: &str, default: f64) -> Inches {
self.variables
.get(name)
.map(|v| match v {
EvalValue::Length(l) => *l,
EvalValue::Scalar(s) => Inches(*s),
EvalValue::Color(_) => Inches(default),
})
.unwrap_or(Inches(default))
}
/// Move position in the current direction
pub fn advance(&mut self, distance: Inches) {
self.position += self.direction.offset(distance);
}
/// Add an object to the context
// cref: pik_after_adding_element (pikchr.c:7095) - p->eDir = pObj->outDir
#[allow(unused_variables)]
pub fn add_object(&mut self, obj: RenderedObject) {
let old_cursor = self.position;
// Update bounds
expand_object_bounds(&mut self.bounds, &obj);
// Update direction to match the object's direction
// This handles cases like "arrow left" where the direction attribute
// changes the global direction for subsequent objects
self.direction = obj.direction;
// Update position to exit edge of object in the object's direction
// For shaped objects, this is the edge point in the travel direction
// For line-like objects, this is already handled correctly by their end()
let exit_point = match obj.class() {
ClassName::Line
| ClassName::Arrow
| ClassName::Spline
| ClassName::Move
| ClassName::Arc => {
// Check if this is a closed line (polygon)
// cref: pikchr.c:7122-7126 - closed lines use bbox edge as exit
let is_closed = obj.style().close_path;
if is_closed
&& matches!(
obj.class(),
ClassName::Line | ClassName::Arrow | ClassName::Spline
)
{
// For closed lines, exit point is edge of bounding box in object's direction
// cref: pik_elem_set_exit (pikchr.c:5740-5747)
use crate::types::UnitVec;
let unit_dir = match self.direction {
crate::ast::Direction::Right => UnitVec::EAST,
crate::ast::Direction::Left => UnitVec::WEST,
crate::ast::Direction::Up => UnitVec::NORTH,
crate::ast::Direction::Down => UnitVec::SOUTH,
};
obj.edge_point(unit_dir)
} else {
// For open lines, exit point is last waypoint
obj.end()
}
}
ClassName::Dot => {
// cref: dotCheck (pikchr.c:4042-4047)
// Dots set w = h = 0, so ptExit = ptAt (center, not edge)
// This means dots don't advance the cursor by their radius
obj.center()
}
_ => {
// For shaped objects, get edge point in current direction
use crate::types::UnitVec;
let unit_dir = match self.direction {
crate::ast::Direction::Right => UnitVec::EAST,
crate::ast::Direction::Left => UnitVec::WEST,
crate::ast::Direction::Up => UnitVec::NORTH,
crate::ast::Direction::Down => UnitVec::SOUTH,
};
obj.edge_point(unit_dir)
}
};
self.position = exit_point;
crate::log::debug!(
"{:?} {:?}: cursor ({:.3}, {:.3}) -> ({:.3}, {:.3})",
obj.class(),
obj.name.as_deref().unwrap_or("-"),
old_cursor.x.0,
old_cursor.y.0,
exit_point.x.0,
exit_point.y.0,
);
// Store named objects in the appropriate lookup map
// cref: pik_find_byname (pikchr.c:4027-4044)
// Explicit names (from labels like `C1:`) go in explicit_names
// Text-derived names (from `circle "C0"`) go in text_names
// An object can have BOTH - e.g., `B1: box "One"` is findable by "B1" and "One"
if let Some(ref name) = obj.name {
if obj.name_is_explicit {
self.explicit_names.insert(name.clone(), obj.clone());
} else {
self.text_names.insert(name.clone(), obj.clone());
}
}
// Also store text-derived name separately if it exists (for objects like `B1: box "One"`)
if let Some(ref text_name) = obj.text_name {
self.text_names.insert(text_name.clone(), obj.clone());
}
self.object_list.push(obj);
}
/// Add a named position (e.g., `OUT: 6.3in right of previous.e`)
pub fn add_named_position(&mut self, name: String, pos: PointIn) {
crate::log::debug!(
name = %name,
x = pos.x.raw(),
y = pos.y.raw(),
"Adding named position"
);
self.named_positions.insert(name, pos);
}
/// Get a named position
pub fn get_named_position(&self, name: &str) -> Option<PointIn> {
self.named_positions.get(name).copied()
}
}