Implement round joins
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@ -12,6 +12,7 @@ use pathfinder_canvas::{CanvasRenderingContext2D, Path2D};
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use pathfinder_geometry::basic::point::{Point2DF32, Point2DI32};
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use pathfinder_geometry::basic::rect::RectF32;
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use pathfinder_geometry::color::ColorF;
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use pathfinder_geometry::stroke::LineJoin;
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use pathfinder_gl::{GLDevice, GLVersion};
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use pathfinder_gpu::resources::FilesystemResourceLoader;
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use pathfinder_gpu::{ClearParams, Device};
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@ -390,6 +390,9 @@ impl Contour {
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chord = chord.scale(radius.recip());
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let (mut vector, end_vector) = (UnitVector(chord.from()), UnitVector(chord.to()));
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debug_assert!(f32::abs(vector.0.length() - 1.0) < EPSILON);
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debug_assert!(f32::abs(end_vector.0.length() - 1.0) < EPSILON);
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let scale = Transform2DF32::from_scale(Point2DF32::splat(radius));
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let translation = Transform2DF32::from_translation(center);
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@ -43,6 +43,7 @@ pub enum LineCap {
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pub enum LineJoin {
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Miter,
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Bevel,
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Round,
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}
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impl<'a> OutlineStrokeToFill<'a> {
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@ -62,8 +63,8 @@ impl<'a> OutlineStrokeToFill<'a> {
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stroker.offset_forward();
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if closed {
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self.push_stroked_contour(&mut new_contours, stroker.output, true);
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stroker = ContourStrokeToFill::new(stroker.input,
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self.push_stroked_contour(&mut new_contours, stroker, true);
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stroker = ContourStrokeToFill::new(input,
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Contour::new(),
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self.style.line_width * 0.5,
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self.style.line_join);
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@ -76,7 +77,7 @@ impl<'a> OutlineStrokeToFill<'a> {
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self.add_cap(&mut stroker.output);
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}
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self.push_stroked_contour(&mut new_contours, stroker.output, closed);
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self.push_stroked_contour(&mut new_contours, stroker, closed);
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}
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let mut new_bounds = None;
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@ -93,16 +94,18 @@ impl<'a> OutlineStrokeToFill<'a> {
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fn push_stroked_contour(&mut self,
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new_contours: &mut Vec<Contour>,
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mut contour: Contour,
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mut stroker: ContourStrokeToFill,
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closed: bool) {
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// Add join if necessary.
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if closed && contour.needs_join(self.style.line_join) {
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let (p1, p0) = (contour.position_of(1), contour.position_of(0));
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contour.add_join(self.style.line_join, &LineSegmentF32::new(p0, p1));
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if closed && stroker.output.needs_join(self.style.line_join) {
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let (p1, p0) = (stroker.output.position_of(1), stroker.output.position_of(0));
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let final_segment = LineSegmentF32::new(p1, p0);
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let join_point = stroker.input.position_of(0);
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stroker.output.add_join(self.style.line_join, join_point, &final_segment);
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}
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contour.closed = true;
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new_contours.push(contour);
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stroker.output.closed = true;
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new_contours.push(stroker.output);
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}
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fn add_cap(&mut self, contour: &mut Contour) {
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@ -176,21 +179,23 @@ impl<'a> ContourStrokeToFill<'a> {
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trait Offset {
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fn offset(&self, distance: f32, join: LineJoin, contour: &mut Contour);
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fn add_to_contour(&self, join: LineJoin, contour: &mut Contour);
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fn add_to_contour(&self, join: LineJoin, join_point: Point2DF32, contour: &mut Contour);
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fn offset_once(&self, distance: f32) -> Self;
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fn error_is_within_tolerance(&self, other: &Segment, distance: f32) -> bool;
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}
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impl Offset for Segment {
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fn offset(&self, distance: f32, join: LineJoin, contour: &mut Contour) {
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let join_point = self.baseline.from();
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if self.baseline.square_length() < TOLERANCE * TOLERANCE {
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self.add_to_contour(join, contour);
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self.add_to_contour(join, join_point, contour);
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return;
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}
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let candidate = self.offset_once(distance);
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if self.error_is_within_tolerance(&candidate, distance) {
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candidate.add_to_contour(join, contour);
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candidate.add_to_contour(join, join_point, contour);
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return;
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}
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@ -202,7 +207,7 @@ impl Offset for Segment {
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after.offset(distance, join, contour);
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}
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fn add_to_contour(&self, join: LineJoin, contour: &mut Contour) {
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fn add_to_contour(&self, join: LineJoin, join_point: Point2DF32, contour: &mut Contour) {
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// Add join if necessary.
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if contour.needs_join(join) {
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let p3 = self.baseline.from();
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@ -214,7 +219,7 @@ impl Offset for Segment {
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self.ctrl.from()
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};
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contour.add_join(join, &LineSegmentF32::new(p4, p3));
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contour.add_join(join, join_point, &LineSegmentF32::new(p4, p3));
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}
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// Push segment.
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@ -322,17 +327,26 @@ impl Offset for Segment {
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impl Contour {
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fn needs_join(&self, join: LineJoin) -> bool {
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// TODO(pcwalton): Miter limit.
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join == LineJoin::Miter && self.len() >= 2
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(join == LineJoin::Miter || join == LineJoin::Round) && self.len() >= 2
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}
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fn add_join(&mut self, _: LineJoin, next_tangent: &LineSegmentF32) {
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// TODO(pcwalton): Round joins.
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fn add_join(&mut self, join: LineJoin, join_point: Point2DF32, next_tangent: &LineSegmentF32) {
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let (p0, p1) = (self.position_of_last(2), self.position_of_last(1));
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let prev_tangent = LineSegmentF32::new(p0, p1);
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match join {
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LineJoin::Bevel => {}
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LineJoin::Miter => {
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if let Some(prev_tangent_t) = prev_tangent.intersection_t(&next_tangent) {
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self.push_endpoint(prev_tangent.sample(prev_tangent_t));
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}
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}
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LineJoin::Round => {
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self.push_arc_from_chord(join_point, LineSegmentF32::new(prev_tangent.to(),
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next_tangent.to()));
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}
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}
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}
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}
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impl Default for StrokeStyle {
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