Something went wrong. Try again.
inkfinite (an infinite canvas/whiteboard) monorepo ink.stormlightlabs.org
svelte rust tauri svg canvas perfect-freehand
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786//! Canonical native path topology operations.//!//! These operations are shared by interactive editors and other document//! clients. They mutate normalized geometry only; callers remain responsible//! for applying the resulting properties through the transaction engine.
use schemars::JsonSchema;use serde::{Deserialize, Serialize};use thiserror::Error;use ts_rs::TS;
use crate::{PathGeometry, PathHandleMode, PathSegment, PathSubpath, Vec2};
/// Curve kind used when converting a straight path segment.#[derive(Clone, Copy, Debug, Eq, JsonSchema, PartialEq, Serialize, Deserialize, TS)]#[serde(rename_all = "snake_case")]#[ts(rename_all = "snake_case")]pub enum PathCurveKind { /// A quadratic Bézier with one control point. Quadratic, /// A cubic Bézier with two control points. Cubic,}
/// One deterministic edit to normalized path topology.#[derive(Clone, Debug, JsonSchema, PartialEq, Serialize, Deserialize, TS)]#[serde(rename_all = "snake_case", tag = "type")]pub enum PathTopologyOperation { /// Split a segment at a parameter strictly between zero and one. AddAnchor { /// Subpath containing the segment. subpath_index: usize, /// Segment whose destination anchor is split. segment_index: usize, /// Curve parameter at which the new anchor is inserted. t: f64, }, /// Remove the anchor identified by a segment destination. DeleteAnchor { /// Subpath containing the anchor. subpath_index: usize, /// Segment whose destination anchor is removed. segment_index: usize, }, /// Convert a straight segment into a quadratic or cubic curve. ConvertToCurve { /// Subpath containing the segment. subpath_index: usize, /// Segment to convert. segment_index: usize, /// Curve representation to create. curve: PathCurveKind, }, /// Discard curve controls and retain the segment destination. ConvertToLine { /// Subpath containing the segment. subpath_index: usize, /// Segment to convert. segment_index: usize, }, /// Make a closed subpath open by removing its implicit closing edge. OpenPath { /// Subpath to open. subpath_index: usize, }, /// Make an open subpath closed with an implicit edge to its move point. ClosePath { /// Subpath to close. subpath_index: usize, }, /// Join the selected endpoints of two open subpaths into one open subpath. JoinEndpoints { /// First subpath containing an endpoint. first_subpath_index: usize, /// Whether the first endpoint is the move-point endpoint. first_at_start: bool, /// Second subpath containing an endpoint. second_subpath_index: usize, /// Whether the second endpoint is the move-point endpoint. second_at_start: bool, }, /// Make the handles at an anchor independent. BreakHandles { /// Subpath containing the anchor. subpath_index: usize, /// Anchor segment index whose handles are changed. segment_index: usize, }, /// Align the handles at an anchor and mark them as joined. JoinHandles { /// Subpath containing the anchor. subpath_index: usize, /// Anchor segment index whose handles are changed. segment_index: usize, },}
/// Failure returned when a path topology operation cannot preserve normalized geometry.#[derive(Clone, Debug, Eq, Error, PartialEq)]pub enum PathTopologyError { /// The operation refers to an unknown subpath. #[error("path subpath {0} does not exist")] UnknownSubpath(usize), /// The operation refers to an unknown segment. #[error("path subpath {subpath} segment {segment} does not exist")] UnknownSegment { subpath: usize, segment: usize }, /// The operation targets the move segment instead of an anchor-ending segment. #[error("path subpath {subpath} segment {segment} is not an editable segment")] MoveSegment { subpath: usize, segment: usize }, /// The split parameter is outside the interior of the segment. #[error("path split parameter must be finite and strictly between zero and one")] InvalidParameter, /// The operation requires a closed subpath. #[error("path subpath {subpath} is already open")] AlreadyOpen { subpath: usize }, /// The operation requires an open subpath. #[error("path subpath {subpath} is already closed")] AlreadyClosed { subpath: usize }, /// Joining an endpoint to another endpoint in the same subpath is not supported. #[error("path subpath {subpath} cannot join an endpoint to itself")] SameSubpath { subpath: usize }, /// Joining requires open subpaths. #[error("path subpath {subpath} is closed and cannot be joined")] ClosedSubpath { subpath: usize }, /// Removing this anchor would leave no move segment. #[error("path subpath {subpath} cannot delete its only anchor")] OnlyAnchor { subpath: usize }, /// The supplied geometry could not be used as normalized path data. #[error("invalid path geometry: {0}")] InvalidGeometry(String),}
/// Applies one canonical topology operation in place.////// The caller should run [`crate::validate_path_geometry`] after applying a/// sequence of operations. This function preserves all segment coordinates/// not needed by the requested topology change.////// # Errors////// Returns [`PathTopologyError`] when the target or split parameter is invalid.pub fn apply_path_topology_operation( geometry: &mut PathGeometry, operation: &PathTopologyOperation,) -> Result<(), PathTopologyError> { crate::validate_path_geometry(geometry).map_err(|error| PathTopologyError::InvalidGeometry(error.to_string()))?; match operation { PathTopologyOperation::AddAnchor { subpath_index, segment_index, t } => { split_segment(geometry, *subpath_index, *segment_index, *t) } PathTopologyOperation::DeleteAnchor { subpath_index, segment_index } => { delete_anchor(geometry, *subpath_index, *segment_index) } PathTopologyOperation::ConvertToCurve { subpath_index, segment_index, curve } => { convert_to_curve(geometry, *subpath_index, *segment_index, *curve) } PathTopologyOperation::ConvertToLine { subpath_index, segment_index } => { convert_to_line(geometry, *subpath_index, *segment_index) } PathTopologyOperation::OpenPath { subpath_index } => open_path(geometry, *subpath_index), PathTopologyOperation::ClosePath { subpath_index } => close_path(geometry, *subpath_index), PathTopologyOperation::JoinEndpoints { first_subpath_index, first_at_start, second_subpath_index, second_at_start, } => join_endpoints( geometry, *first_subpath_index, *first_at_start, *second_subpath_index, *second_at_start, ), PathTopologyOperation::BreakHandles { subpath_index, segment_index } => { set_handle_mode(geometry, *subpath_index, *segment_index, PathHandleMode::Broken) } PathTopologyOperation::JoinHandles { subpath_index, segment_index } => { join_handles(geometry, *subpath_index, *segment_index) } }}
/// Applies a sequence of canonical topology operations in order.////// # Errors////// Returns the first topology error or a normalized-geometry validation error.pub fn apply_path_topology_operations( geometry: &mut PathGeometry, operations: &[PathTopologyOperation],) -> Result<(), PathTopologyError> { let mut candidate = geometry.clone(); for operation in operations { apply_path_topology_operation(&mut candidate, operation)?; } crate::validate_path_geometry(&candidate).map_err(|error| PathTopologyError::InvalidGeometry(error.to_string()))?; *geometry = candidate; Ok(())}
fn open_path(geometry: &mut PathGeometry, subpath_index: usize) -> Result<(), PathTopologyError> { let subpath = subpath_mut(geometry, subpath_index)?; if !subpath.closed { return Err(PathTopologyError::AlreadyOpen { subpath: subpath_index }); } subpath.closed = false; Ok(())}
fn close_path(geometry: &mut PathGeometry, subpath_index: usize) -> Result<(), PathTopologyError> { let subpath = subpath_mut(geometry, subpath_index)?; if subpath.closed { return Err(PathTopologyError::AlreadyClosed { subpath: subpath_index }); } subpath.closed = true; Ok(())}
fn join_endpoints( geometry: &mut PathGeometry, first_subpath_index: usize, first_at_start: bool, second_subpath_index: usize, second_at_start: bool,) -> Result<(), PathTopologyError> { if first_subpath_index == second_subpath_index { return Err(PathTopologyError::SameSubpath { subpath: first_subpath_index }); } let first = geometry .subpaths .get(first_subpath_index) .ok_or(PathTopologyError::UnknownSubpath(first_subpath_index))?; let second = geometry .subpaths .get(second_subpath_index) .ok_or(PathTopologyError::UnknownSubpath(second_subpath_index))?; if first.closed { return Err(PathTopologyError::ClosedSubpath { subpath: first_subpath_index }); } if second.closed { return Err(PathTopologyError::ClosedSubpath { subpath: second_subpath_index }); }
let mut first = first.clone(); let mut second = second.clone(); if first_at_start { first = reverse_subpath(first); } if !second_at_start { second = reverse_subpath(second); }
let first_end = first .segments .last() .map(segment_to) .ok_or_else(|| PathTopologyError::InvalidGeometry("cannot join an empty subpath".into()))?; let second_start = second .segments .first() .map(segment_to) .ok_or_else(|| PathTopologyError::InvalidGeometry("cannot join an empty subpath".into()))?; let first_modes = handle_modes(&first); let second_modes = handle_modes(&second); let has_handle_modes = first.handle_modes.is_some() || second.handle_modes.is_some();
let mut merged_segments = first.segments; let mut merged_modes = first_modes; if !same_point(first_end, second_start) { merged_segments.push(PathSegment::Line { to: second_start }); merged_modes.push(second_modes[0]); } merged_segments.extend(second.segments.into_iter().skip(1)); merged_modes.extend(second_modes.into_iter().skip(1));
let merged = PathSubpath { segments: merged_segments, closed: false, handle_modes: has_handle_modes.then_some(merged_modes), }; let target_index = first_subpath_index.min(second_subpath_index); let removed_index = first_subpath_index.max(second_subpath_index); geometry.subpaths[target_index] = merged; geometry.subpaths.remove(removed_index); Ok(())}
fn reverse_subpath(subpath: PathSubpath) -> PathSubpath { let original = subpath.segments; let mut segments = Vec::with_capacity(original.len()); if let Some(last) = original.last() { segments.push(PathSegment::Move { to: segment_to(last) }); for index in (1..original.len()).rev() { let start = segment_to(&original[index - 1]); segments.push(reverse_segment(original[index], start)); } } PathSubpath { segments, closed: subpath.closed, handle_modes: subpath.handle_modes.map(|modes| modes.into_iter().rev().collect()), }}
fn reverse_segment(segment: PathSegment, start: Vec2) -> PathSegment { match segment { PathSegment::Move { .. } => PathSegment::Move { to: start }, PathSegment::Line { .. } => PathSegment::Line { to: start }, PathSegment::Quadratic { control, .. } => PathSegment::Quadratic { control, to: start }, PathSegment::Cubic { control_1, control_2, .. } => { PathSegment::Cubic { control_1: control_2, control_2: control_1, to: start } } }}
fn handle_modes(subpath: &PathSubpath) -> Vec<PathHandleMode> { subpath .handle_modes .clone() .unwrap_or_else(|| vec![PathHandleMode::Broken; subpath.segments.len()])}
fn same_point(left: Vec2, right: Vec2) -> bool { left.x == right.x && left.y == right.y}
fn split_segment( geometry: &mut PathGeometry, subpath_index: usize, segment_index: usize, t: f64,) -> Result<(), PathTopologyError> { validate_parameter(t)?; let subpath = subpath_mut(geometry, subpath_index)?; if segment_index == 0 { return Err(PathTopologyError::MoveSegment { subpath: subpath_index, segment: segment_index }); } let closing = segment_index == subpath.segments.len() && subpath.closed; let segment = if closing { PathSegment::Line { to: segment_to(&subpath.segments[0]) } } else { *subpath .segments .get(segment_index) .ok_or(PathTopologyError::UnknownSegment { subpath: subpath_index, segment: segment_index })? }; let start = if closing { segment_to( subpath .segments .last() .ok_or(PathTopologyError::UnknownSubpath(subpath_index))?, ) } else { segment_start(subpath, segment_index)? }; let (first, second) = match segment { PathSegment::Line { to } => { let middle = lerp(start, to, t); (PathSegment::Line { to: middle }, PathSegment::Line { to }) } PathSegment::Quadratic { control, to } => { let first_control = lerp(start, control, t); let second_control = lerp(control, to, t); let middle = lerp(first_control, second_control, t); ( PathSegment::Quadratic { control: first_control, to: middle }, PathSegment::Quadratic { control: second_control, to }, ) } PathSegment::Cubic { control_1, control_2, to } => { let first_control = lerp(start, control_1, t); let bridge = lerp(control_1, control_2, t); let second_control = lerp(control_2, to, t); let first_bridge = lerp(first_control, bridge, t); let second_bridge = lerp(bridge, second_control, t); let middle = lerp(first_bridge, second_bridge, t); ( PathSegment::Cubic { control_1: first_control, control_2: first_bridge, to: middle }, PathSegment::Cubic { control_1: second_bridge, control_2: second_control, to }, ) } PathSegment::Move { .. } => { return Err(PathTopologyError::MoveSegment { subpath: subpath_index, segment: segment_index }); } }; if closing { subpath.segments.push(first); if let Some(modes) = &mut subpath.handle_modes { modes.push(PathHandleMode::Joined); } } else { subpath.segments[segment_index] = first; subpath.segments.insert(segment_index + 1, second); if let Some(modes) = &mut subpath.handle_modes { modes.insert(segment_index + 1, PathHandleMode::Joined); } } Ok(())}
fn delete_anchor( geometry: &mut PathGeometry, subpath_index: usize, segment_index: usize,) -> Result<(), PathTopologyError> { let subpath = subpath_mut(geometry, subpath_index)?; if subpath.segments.len() == 1 { return Err(PathTopologyError::OnlyAnchor { subpath: subpath_index }); } if segment_index >= subpath.segments.len() { return Err(PathTopologyError::UnknownSegment { subpath: subpath_index, segment: segment_index }); } if segment_index == 0 { let new_start = segment_to(&subpath.segments[1]); subpath.segments[0] = PathSegment::Move { to: new_start }; subpath.segments.remove(1); if let Some(modes) = &mut subpath.handle_modes { let replacement = modes.get(1).copied().unwrap_or(PathHandleMode::Broken); modes[0] = replacement; modes.remove(1); } } else { subpath.segments.remove(segment_index); if let Some(modes) = &mut subpath.handle_modes { modes.remove(segment_index); } } Ok(())}
fn convert_to_curve( geometry: &mut PathGeometry, subpath_index: usize, segment_index: usize, curve: PathCurveKind,) -> Result<(), PathTopologyError> { let subpath = subpath_mut(geometry, subpath_index)?; if segment_index == 0 { return Err(PathTopologyError::MoveSegment { subpath: subpath_index, segment: segment_index }); } let segment = *subpath .segments .get(segment_index) .ok_or(PathTopologyError::UnknownSegment { subpath: subpath_index, segment: segment_index })?; let PathSegment::Line { to } = segment else { return Ok(()); }; let start = segment_start(subpath, segment_index)?; subpath.segments[segment_index] = match curve { PathCurveKind::Quadratic => PathSegment::Quadratic { control: lerp(start, to, 0.5), to }, PathCurveKind::Cubic => { PathSegment::Cubic { control_1: lerp(start, to, 1.0 / 3.0), control_2: lerp(start, to, 2.0 / 3.0), to } } }; Ok(())}
fn convert_to_line( geometry: &mut PathGeometry, subpath_index: usize, segment_index: usize,) -> Result<(), PathTopologyError> { let subpath = subpath_mut(geometry, subpath_index)?; if segment_index == 0 { return Err(PathTopologyError::MoveSegment { subpath: subpath_index, segment: segment_index }); } let segment = subpath .segments .get_mut(segment_index) .ok_or(PathTopologyError::UnknownSegment { subpath: subpath_index, segment: segment_index })?; let to = match *segment { PathSegment::Move { .. } => { return Err(PathTopologyError::MoveSegment { subpath: subpath_index, segment: segment_index }); } PathSegment::Line { to } | PathSegment::Quadratic { to, .. } | PathSegment::Cubic { to, .. } => to, }; *segment = PathSegment::Line { to }; Ok(())}
fn set_handle_mode( geometry: &mut PathGeometry, subpath_index: usize, segment_index: usize, mode: PathHandleMode,) -> Result<(), PathTopologyError> { let subpath = subpath_mut(geometry, subpath_index)?; if segment_index >= subpath.segments.len() { return Err(PathTopologyError::UnknownSegment { subpath: subpath_index, segment: segment_index }); } ensure_handle_modes(subpath)[segment_index] = mode; Ok(())}
fn join_handles( geometry: &mut PathGeometry, subpath_index: usize, segment_index: usize,) -> Result<(), PathTopologyError> { let subpath = subpath_mut(geometry, subpath_index)?; if segment_index >= subpath.segments.len() { return Err(PathTopologyError::UnknownSegment { subpath: subpath_index, segment: segment_index }); } if segment_index > 0 && segment_index + 1 < subpath.segments.len() { let anchor = segment_to(&subpath.segments[segment_index]); let incoming = match subpath.segments[segment_index] { PathSegment::Cubic { control_2, .. } => Some(control_2), _ => None, }; let outgoing = match subpath.segments[segment_index + 1] { PathSegment::Cubic { control_1, .. } => Some(control_1), _ => None, }; if let (Some(incoming), Some(outgoing)) = (incoming, outgoing) { let mut direction = subtract(outgoing, anchor); let outgoing_length = length(direction); if outgoing_length <= f64::EPSILON { direction = subtract(anchor, incoming); } let direction_length = length(direction); if direction_length > f64::EPSILON { direction = scale(direction, 1.0 / direction_length); let incoming_length = length(subtract(incoming, anchor)); let outgoing_length = length(subtract(outgoing, anchor)); if let PathSegment::Cubic { control_2, .. } = &mut subpath.segments[segment_index] { *control_2 = subtract(anchor, scale(direction, incoming_length)); } if let PathSegment::Cubic { control_1, .. } = &mut subpath.segments[segment_index + 1] { *control_1 = add(anchor, scale(direction, outgoing_length)); } } } } ensure_handle_modes(subpath)[segment_index] = PathHandleMode::Joined; Ok(())}
fn subpath_mut(geometry: &mut PathGeometry, index: usize) -> Result<&mut PathSubpath, PathTopologyError> { geometry .subpaths .get_mut(index) .ok_or(PathTopologyError::UnknownSubpath(index))}
fn segment_start(subpath: &PathSubpath, segment_index: usize) -> Result<Vec2, PathTopologyError> { if segment_index == 0 { return Err(PathTopologyError::MoveSegment { subpath: 0, segment: segment_index }); } subpath .segments .get(segment_index - 1) .map(segment_to) .ok_or(PathTopologyError::UnknownSegment { subpath: 0, segment: segment_index })}
fn segment_to(segment: &PathSegment) -> Vec2 { match *segment { PathSegment::Move { to } | PathSegment::Line { to } | PathSegment::Quadratic { to, .. } | PathSegment::Cubic { to, .. } => to, }}
fn ensure_handle_modes(subpath: &mut PathSubpath) -> &mut Vec<PathHandleMode> { subpath .handle_modes .get_or_insert_with(|| vec![PathHandleMode::Broken; subpath.segments.len()])}
fn validate_parameter(t: f64) -> Result<(), PathTopologyError> { if t.is_finite() && t > 0.0 && t < 1.0 { Ok(()) } else { Err(PathTopologyError::InvalidParameter) }}
fn lerp(start: Vec2, end: Vec2, t: f64) -> Vec2 { Vec2 { x: start.x + (end.x - start.x) * t, y: start.y + (end.y - start.y) * t }}
fn subtract(left: Vec2, right: Vec2) -> Vec2 { Vec2 { x: left.x - right.x, y: left.y - right.y }}
fn add(left: Vec2, right: Vec2) -> Vec2 { Vec2 { x: left.x + right.x, y: left.y + right.y }}
fn scale(point: Vec2, factor: f64) -> Vec2 { Vec2 { x: point.x * factor, y: point.y * factor }}
fn length(point: Vec2) -> f64 { point.x.hypot(point.y)}
#[cfg(test)]mod tests { use super::*;
fn geometry() -> PathGeometry { PathGeometry { subpaths: vec![PathSubpath { segments: vec![ PathSegment::Move { to: Vec2 { x: 0.0, y: 0.0 } }, PathSegment::Line { to: Vec2 { x: 30.0, y: 0.0 } }, PathSegment::Cubic { control_1: Vec2 { x: 40.0, y: 0.0 }, control_2: Vec2 { x: 50.0, y: 20.0 }, to: Vec2 { x: 60.0, y: 20.0 }, }, ], closed: false, handle_modes: None, }], fill_rule: crate::PathFillRule::NonZero, } }
#[test] fn splits_lines_and_curves_with_de_casteljau_geometry() { let mut line = geometry(); apply_path_topology_operation( &mut line, &PathTopologyOperation::AddAnchor { subpath_index: 0, segment_index: 1, t: 0.5 }, ) .expect("line split"); assert_eq!( line.subpaths[0].segments[1], PathSegment::Line { to: Vec2 { x: 15.0, y: 0.0 } } ); assert_eq!(line.subpaths[0].segments.len(), 4);
let mut curve = geometry(); apply_path_topology_operation( &mut curve, &PathTopologyOperation::AddAnchor { subpath_index: 0, segment_index: 2, t: 0.5 }, ) .expect("curve split"); assert_eq!(curve.subpaths[0].segments.len(), 4); assert!(matches!(curve.subpaths[0].segments[2], PathSegment::Cubic { .. })); assert!(crate::validate_path_geometry(&curve).is_ok()); }
#[test] fn converts_segments_and_deletes_anchors() { let mut geometry = geometry(); apply_path_topology_operation( &mut geometry, &PathTopologyOperation::ConvertToCurve { subpath_index: 0, segment_index: 1, curve: PathCurveKind::Quadratic, }, ) .expect("line to curve"); assert!(matches!( geometry.subpaths[0].segments[1], PathSegment::Quadratic { .. } )); apply_path_topology_operation( &mut geometry, &PathTopologyOperation::ConvertToLine { subpath_index: 0, segment_index: 2 }, ) .expect("curve to line"); assert!(matches!(geometry.subpaths[0].segments[2], PathSegment::Line { .. })); apply_path_topology_operation( &mut geometry, &PathTopologyOperation::DeleteAnchor { subpath_index: 0, segment_index: 1 }, ) .expect("delete anchor"); assert_eq!(geometry.subpaths[0].segments.len(), 2); assert!(crate::validate_path_geometry(&geometry).is_ok()); }
#[test] fn joins_and_breaks_cubic_handles() { let mut geometry = geometry(); apply_path_topology_operation( &mut geometry, &PathTopologyOperation::JoinHandles { subpath_index: 0, segment_index: 1 }, ) .expect("join handles"); assert_eq!( geometry.subpaths[0].handle_modes.as_ref().unwrap()[1], PathHandleMode::Joined ); apply_path_topology_operation( &mut geometry, &PathTopologyOperation::BreakHandles { subpath_index: 0, segment_index: 1 }, ) .expect("break handles"); assert_eq!( geometry.subpaths[0].handle_modes.as_ref().unwrap()[1], PathHandleMode::Broken ); }
#[test] fn opens_and_closes_subpaths_without_changing_compound_fill_rule() { let mut geometry = PathGeometry { subpaths: vec![ PathSubpath { segments: vec![ PathSegment::Move { to: Vec2 { x: 0.0, y: 0.0 } }, PathSegment::Line { to: Vec2 { x: 10.0, y: 0.0 } }, ], closed: false, handle_modes: None, }, PathSubpath { segments: vec![ PathSegment::Move { to: Vec2 { x: 20.0, y: 20.0 } }, PathSegment::Line { to: Vec2 { x: 30.0, y: 20.0 } }, ], closed: true, handle_modes: None, }, ], fill_rule: crate::PathFillRule::EvenOdd, }; apply_path_topology_operation(&mut geometry, &PathTopologyOperation::ClosePath { subpath_index: 0 }) .expect("close path"); apply_path_topology_operation(&mut geometry, &PathTopologyOperation::OpenPath { subpath_index: 1 }) .expect("open path"); assert!(geometry.subpaths[0].closed); assert!(!geometry.subpaths[1].closed); assert_eq!(geometry.fill_rule, crate::PathFillRule::EvenOdd); assert!(crate::validate_path_geometry(&geometry).is_ok()); }
#[test] fn joins_open_endpoints_and_reverses_selected_orientations() { let mut geometry = PathGeometry { subpaths: vec![ PathSubpath { segments: vec![ PathSegment::Move { to: Vec2 { x: 0.0, y: 0.0 } }, PathSegment::Line { to: Vec2 { x: 10.0, y: 0.0 } }, ], closed: false, handle_modes: None, }, PathSubpath { segments: vec![ PathSegment::Move { to: Vec2 { x: 20.0, y: 0.0 } }, PathSegment::Line { to: Vec2 { x: 30.0, y: 0.0 } }, ], closed: false, handle_modes: None, }, ], fill_rule: crate::PathFillRule::NonZero, }; apply_path_topology_operation( &mut geometry, &PathTopologyOperation::JoinEndpoints { first_subpath_index: 0, first_at_start: true, second_subpath_index: 1, second_at_start: false, }, ) .expect("join endpoints");
assert_eq!(geometry.subpaths.len(), 1); assert_eq!( geometry.subpaths[0].segments, vec![ PathSegment::Move { to: Vec2 { x: 10.0, y: 0.0 } }, PathSegment::Line { to: Vec2 { x: 0.0, y: 0.0 } }, PathSegment::Line { to: Vec2 { x: 30.0, y: 0.0 } }, PathSegment::Line { to: Vec2 { x: 20.0, y: 0.0 } }, ] ); assert_eq!(geometry.fill_rule, crate::PathFillRule::NonZero); assert!(crate::validate_path_geometry(&geometry).is_ok()); }
#[test] fn rejects_invalid_path_topology_operations() { let mut geometry = geometry(); assert_eq!( apply_path_topology_operation(&mut geometry, &PathTopologyOperation::OpenPath { subpath_index: 0 }), Err(PathTopologyError::AlreadyOpen { subpath: 0 }) ); assert_eq!( apply_path_topology_operation( &mut geometry, &PathTopologyOperation::JoinEndpoints { first_subpath_index: 0, first_at_start: false, second_subpath_index: 0, second_at_start: true, } ), Err(PathTopologyError::SameSubpath { subpath: 0 }) );
geometry.subpaths[0].handle_modes = Some(Vec::new()); assert!(matches!( apply_path_topology_operation(&mut geometry, &PathTopologyOperation::ClosePath { subpath_index: 0 }), Err(PathTopologyError::InvalidGeometry(_)) )); }}