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.

src/canvas/mod.rs

@@ -1,14 +1,26 @@
+mod edit;
+mod gesture;
+mod history;
+mod marks;
 mod minimap;
+mod palette;
 mod plane;
 mod shape;
+mod tools;
 mod view;
 mod zoom;
 
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
 
+pub use edit::{Handle, Tool};
+pub use gesture::Brush;
+pub use history::HistoryPanel;
+pub use marks::{SelectionBox, SnapIndicator, TransformHandles};
 pub use minimap::MiniMap;
+pub use palette::{BrushSettings, ToolPalette};
 pub use plane::InfiniteCanvas;
-pub use shape::{Artboard, Guide, Shape, ShapeKind};
+pub use shape::{Artboard, Corner, Guide, Shape, ShapeKind};
+pub use tools::ToolLayer;
 pub use view::{Frame, Viewport};
 pub use zoom::{ZoomControls, ZoomIndicator};