рефакторинг небольшой

src/tools/line.zig

@@ -1,21 +1,19 @@
-//! Инструмент «Линия»: создаёт линию в позиции клика.
-
 const Canvas = @import("../Canvas.zig");
-const tool_interface = @import("../tool_interface.zig");
+const Tool = @import("../Tool.zig");
 const shape = @import("../models/shape/shape.zig");
 
-fn onClick(ctx: *const tool_interface.ToolContext) void {
-    const canvas: *Canvas = @alignCast(@ptrCast(ctx.canvas));
+fn onCanvasClick(ctx: *const Tool.ToolContext) void {
+    const canvas = ctx.canvas;
     var obj = shape.createObject(canvas.document.allocator, .line) catch return;
+    defer obj.deinit(canvas.allocator);
     obj.setProperty(canvas.document.allocator, .{ .data = .{ .position = ctx.document_point } }) catch {
         obj.deinit(canvas.document.allocator);
         return;
     };
     canvas.document.addObject(obj) catch {
-        obj.deinit(canvas.document.allocator);
         return;
     };
     canvas.requestRedraw();
 }
 
-pub const tool = tool_interface.Tool{ .onClick = onClick };
+pub const tool = Tool.Tool{ .onCanvasClick = onCanvasClick };