Overhaul Path Tool (#498)

* First pass cleanup omw to handles

* Handles dragging with anchors, handles still not draggable and some bugs

* Dragging single side of handle works, need to create mirror case

* In progress addition of improved anchor / handle representation

* partially working

* Handle dragging working for non-end points, normal anchor drag bugged

* Fixed corner cases, fixed anchors without handles bug

* Add snapping

* Change path tool selection by clicking on shape

* Fixed path close point being draggable

* Variable length handle, firstpass of alt to stop mirroring

* Alt improved, not done. Only update structures when needed. Added snapping for selected shapes

* Can now undo path edits

* Do not maintain angle between non-mirrored handles

* Replaced segment based overlay setup with anchor based setup

* Cleanup, handle angle comparison bug remains. Investigating.

* Added OverlayPooler. May closely associate overlays to VectorManipulatorAnchors instead.

* Moved anchor / segment creation logic out of document_message_handler

* Overlays are now managed by VectorManipulatorShapes

* Fixed inconsistent handle mirroring.

* Clearly shows which point you have selected

* Removed OverlayPooler system

* Added more comments

* Removed all clones of the vector structures. A little uglier but better.

* Resolved Text path initialization bug with a workaround.

* Cleaned up comments

* More comment cleanup

* Fixed issue with quad handle dragging unwanted behavior, renamed VectorShapeManipulator

* In progress refactor to allow multi-selection

* In progress dragging multiple points, selection works, transform still has issues

* Added Multiselect, major refactor

* Commented out progress for selection change, bug with hop back on multiple shapes

* Removed debug og

* Resolved issue with merge

* Minor cleanup, added a few comments

* Review changes

* Resolved unclear comment

* Fixed snap back for now

* Add todo comment for future snap back fix

* Working situations where curve paths do not close. Thanks for points it out  @pkupper

* Tweaked selection size

* Fix curve start point dragability, renames, cleanup

* Separated into multiple files, applied @TrueDoctor review feedback

* Resolved tests failing due to doc generation

* Re-added closed, added concept of distance mirroring

* Added shift distance mirroring, removed debounce from anchor

Co-authored-by: Keavon Chambers <keavon@keavon.com>
Thank you for the reviews @TrueDoctor and @pkupper

graphene/src/layers/simple_shape.rs

@@ -17,6 +17,7 @@ pub struct Shape {
 	pub path: BezPath,
 	pub style: style::PathStyle,
 	pub render_index: i32,
+	pub closed: bool,
 }
 
 impl LayerData for Shape {
@@ -74,6 +75,7 @@ impl Shape {
 			path: bez_path,
 			style,
 			render_index: 1,
+			closed,
 		}
 	}
 
@@ -102,7 +104,12 @@ impl Shape {
 
 		path.close_path();
 
-		Self { path, style, render_index: 1 }
+		Self {
+			path,
+			style,
+			render_index: 1,
+			closed: true,
+		}
 	}
 
 	pub fn rectangle(style: PathStyle) -> Self {
@@ -110,6 +117,7 @@ impl Shape {
 			path: kurbo::Rect::new(0., 0., 1., 1.).to_path(0.01),
 			style,
 			render_index: 1,
+			closed: true,
 		}
 	}
 
@@ -118,6 +126,7 @@ impl Shape {
 			path: kurbo::Ellipse::from_rect(kurbo::Rect::new(0., 0., 1., 1.)).to_path(0.01),
 			style,
 			render_index: 1,
+			closed: true,
 		}
 	}
 
@@ -126,6 +135,7 @@ impl Shape {
 			path: kurbo::Line::new((0., 0.), (1., 0.)).to_path(0.01),
 			style,
 			render_index: 1,
+			closed: false,
 		}
 	}
 
@@ -138,6 +148,11 @@ impl Shape {
 			.enumerate()
 			.for_each(|(i, p)| if i == 0 { path.move_to(p) } else { path.line_to(p) });
 
-		Self { path, style, render_index: 0 }
+		Self {
+			path,
+			style,
+			render_index: 0,
+			closed: false,
+		}
 	}
 }