Canvas · Tools: select, move and snap, resize, draw, pen, text, brush

ToolLayer lies over an InfiniteCanvas and carries its tools. Select
takes the topmost shape a press reaches, Shift adds or drops one, a
drag moves the selection and snaps its nearest edge or middle to
another shape's within reach, a handle resizes it, Shift keeping a
corner's shape, and a drag on empty space draws a SelectionBox that
takes what lies wholly inside. The shape tools draw by a drag toward
any corner, Shift keeping them square; the pen adds a point per press
and a double press ends the path; text drops a line where pressed; the
brush strokes a path its width. A drag may end in the layer or out of
it; each gesture ends once and asks the owner. SelectionBox,
TransformHandles and SnapIndicator draw the marks.

ToolPalette picks a tool from icons named in tips; BrushSettings sets a
brush's width and hue; HistoryPanel lists the steps done, the undone
ones quiet, and takes the drawing to a step on Enter or a double press.

The model changes: lines and arrows end at a named corner, so they run
either way, and paths carry their width. Three Lucide icons: hexagon,
slash and move-up-right.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/gallery/pages/canvas/plane.rs

@@ -1,6 +1,7 @@
 use ely_gpui_component::{
     canvas::{
-        Artboard, Frame, Guide, InfiniteCanvas, MiniMap, Shape, ShapeKind, Viewport, ZoomControls,
+        Artboard, Corner, Frame, Guide, InfiniteCanvas, MiniMap, Shape, ShapeKind, Viewport,
+        ZoomControls,
     },
     theme::{ActiveTheme, Radius},
 };
@@ -57,27 +58,30 @@ fn shapes() -> Vec<Shape> {
         Shape::new(
             "rule",
             "Rule",
-            ShapeKind::Line,
+            ShapeKind::Line(Corner::BottomRight),
             Frame::new(24.0, 380.0, 342.0, 0.0),
         )
         .hue(4),
         Shape::new(
             "flow",
             "Flow",
-            ShapeKind::Arrow,
+            ShapeKind::Arrow(Corner::BottomRight),
             Frame::new(390.0, 120.0, 80.0, 0.0),
         )
         .hue(3),
         Shape::new(
             "sketch",
             "Sketch",
-            ShapeKind::Path(vec![
-                (0.0, 40.0),
-                (40.0, 0.0),
-                (80.0, 30.0),
-                (120.0, 10.0),
-                (160.0, 50.0),
-            ]),
+            ShapeKind::Path {
+                points: vec![
+                    (0.0, 40.0),
+                    (40.0, 0.0),
+                    (80.0, 30.0),
+                    (120.0, 10.0),
+                    (160.0, 50.0),
+                ],
+                width: 2.0,
+            },
             Frame::new(494.0, 60.0, 160.0, 50.0),
         )
         .hue(1),