diff --git a/src/models/Object.zig b/src/models/Object.zig
index 2a35118..959b6cd 100644
--- a/src/models/Object.zig
+++ b/src/models/Object.zig
@@ -44,7 +44,7 @@ pub fn getProperty(self: Object, tag: std.meta.Tag(PropertyData)) ?*const Proper
 pub fn setProperty(self: *Object, allocator: std.mem.Allocator, prop: Property) !void {
     for (self.properties.items, 0..) |*p, i| {
         if (std.meta.activeTag(p.data) == std.meta.activeTag(prop.data)) {
-            if (p.data == .points) p.data.points.deinit(allocator);
+            if (p.data == .points) allocator.free(p.data.points);
             self.properties.items[i] = prop;
             return;
         }
diff --git a/src/models/Property.zig b/src/models/Property.zig
index e3b2fd0..8404742 100644
--- a/src/models/Property.zig
+++ b/src/models/Property.zig
@@ -19,7 +19,8 @@ pub const Data = union(enum) {
     arc_percent: f32,
     end_point: Point2_f,
 
-    points: std.ArrayList(Point2_f),
+    /// Владеет памятью; при deinit/clone — free/duplicate.
+    points: []const Point2_f,
     /// Замкнутый контур (для ломаной: отрезок последняя–первая точка + заливка).
     closed: bool,
 
@@ -39,7 +40,7 @@ pub const Property = struct {
 
     pub fn deinit(self: *Property, allocator: std.mem.Allocator) void {
         switch (self.data) {
-            .points => |*list| list.deinit(allocator),
+            .points => |slice| allocator.free(slice),
             else => {},
         }
         self.* = undefined;
@@ -47,9 +48,13 @@ pub const Property = struct {
 
     pub fn clone(self: Property, allocator: std.mem.Allocator) !Property {
         return switch (self.data) {
-            .points => |list| .{
+            .points => |slice| .{
                 .data = .{
-                    .points = try list.clone(allocator),
+                    .points = blk: {
+                        const copy = try allocator.alloc(Point2_f, slice.len);
+                        @memcpy(copy, slice);
+                        break :blk copy;
+                    },
                 },
             },
             else => .{ .data = self.data },
diff --git a/src/models/shape/broken.zig b/src/models/shape/broken.zig
index a3aaac5..70d88ea 100644
--- a/src/models/shape/broken.zig
+++ b/src/models/shape/broken.zig
@@ -4,42 +4,35 @@ const Property = @import("../Property.zig").Property;
 const PropertyData = @import("../Property.zig").Data;
 const Point2_f = @import("../basic_models.zig").Point2_f;
 const Rect_f = @import("../basic_models.zig").Rect_f;
+const common = @import("common.zig");
 const shape_mod = @import("shape.zig");
 
-/// Точки ломаной по умолчанию.
-pub const default_points = [_]Point2_f{
+/// Свойства фигуры по умолчанию (добавляются к общим). points — слайс на статический массив.
+pub const default_shape_properties_points = [_]Point2_f{
     .{ .x = 0, .y = 0 },
     .{ .x = 80, .y = 0 },
     .{ .x = 80, .y = 60 },
 };
+pub const default_shape_properties = [_]Property{
+    .{ .data = .{ .points = &default_shape_properties_points } },
+    .{ .data = .{ .closed = false } },
+    .{ .data = .{ .filled = true } },
+    .{ .data = .{ .fill_rgba = 0x000000FF } },
+};
 
-/// Теги обязательных свойств.
-pub fn getRequiredTags() []const std.meta.Tag(PropertyData) {
-    return &[_]std.meta.Tag(PropertyData){
-        .points,
-    };
-}
-
-/// Добавляет к объекту свойства по умолчанию для ломаной.
-pub fn appendDefaultShapeProperties(allocator: std.mem.Allocator, obj: *Object) !void {
-    var points = std.ArrayList(Point2_f).empty;
-    try points.appendSlice(allocator, &default_points);
-    try obj.properties.append(allocator, .{ .data = .{ .points = points } });
-    try obj.properties.append(allocator, .{ .data = .{ .closed = false } });
-    try obj.properties.append(allocator, .{ .data = .{ .filled = true } });
-    try obj.properties.append(allocator, .{ .data = .{ .fill_rgba = obj.getProperty(.stroke_rgba).?.stroke_rgba } });
-}
+/// Теги обязательных свойств = теги из default_shape_properties.
+pub const required_tags = common.tagsFromProperties(&default_shape_properties);
 
 /// Локальные границы: AABB по точкам.
 pub fn getLocalBounds(obj: *const Object) !Rect_f {
     try shape_mod.ensure(obj, .broken);
     const p = obj.getProperty(.points).?;
-    if (p.points.items.len == 0) return error.EmptyPoints;
-    var min_x: f32 = p.points.items[0].x;
+    if (p.points.len == 0) return error.EmptyPoints;
+    var min_x: f32 = p.points[0].x;
     var max_x: f32 = min_x;
-    var min_y: f32 = p.points.items[0].y;
+    var min_y: f32 = p.points[0].y;
     var max_y: f32 = min_y;
-    for (p.points.items[1..]) |pt| {
+    for (p.points[1..]) |pt| {
         min_x = @min(min_x, pt.x);
         max_x = @max(max_x, pt.x);
         min_y = @min(min_y, pt.y);
diff --git a/src/models/shape/common.zig b/src/models/shape/common.zig
new file mode 100644
index 0000000..32b9181
--- /dev/null
+++ b/src/models/shape/common.zig
@@ -0,0 +1,10 @@
+const std = @import("std");
+const Property = @import("../Property.zig").Property;
+const PropertyData = @import("../Property.zig").Data;
+
+/// Теги свойств — те же, что фигура добавляет к стандартным (из default_shape_properties).
+pub fn tagsFromProperties(comptime props: []const Property) [props.len]std.meta.Tag(PropertyData) {
+    var result: [props.len]std.meta.Tag(PropertyData) = undefined;
+    for (props, &result) |p, *r| r.* = std.meta.activeTag(p.data);
+    return result;
+}
diff --git a/src/models/shape/ellipse.zig b/src/models/shape/ellipse.zig
index fc1a192..92e5479 100644
--- a/src/models/shape/ellipse.zig
+++ b/src/models/shape/ellipse.zig
@@ -1,11 +1,11 @@
 const std = @import("std");
 const Object = @import("../Object.zig");
 const Property = @import("../Property.zig").Property;
-const PropertyData = @import("../Property.zig").Data;
 const Rect_f = @import("../basic_models.zig").Rect_f;
+const common = @import("common.zig");
 const shape_mod = @import("shape.zig");
 
-/// Свойства фигуры по умолчанию.
+/// Свойства фигуры по умолчанию (добавляются к общим).
 pub const default_shape_properties = [_]Property{
     .{ .data = .{ .radii = .{ .x = 50, .y = 50 } } },
     .{ .data = .{ .arc_percent = 100.0 } },
@@ -14,15 +14,8 @@ pub const default_shape_properties = [_]Property{
     .{ .data = .{ .fill_rgba = 0x000000FF } },
 };
 
-/// Теги обязательных свойств.
-pub fn getRequiredTags() []const std.meta.Tag(PropertyData) {
-    return &([_]std.meta.Tag(PropertyData){std.meta.activeTag(default_shape_properties[0].data)});
-}
-
-/// Добавляет к объекту свойства по умолчанию для эллипса.
-pub fn appendDefaultShapeProperties(allocator: std.mem.Allocator, obj: *Object) !void {
-    for (default_shape_properties) |prop| try obj.properties.append(allocator, prop);
-}
+/// Теги обязательных свойств = теги из default_shape_properties.
+pub const required_tags = common.tagsFromProperties(&default_shape_properties);
 
 /// Локальные границы эллипса: [-radii.x, -radii.y] .. [radii.x, radii.y].
 pub fn getLocalBounds(obj: *const Object) !Rect_f {
diff --git a/src/models/shape/line.zig b/src/models/shape/line.zig
index 7166b04..fe9a289 100644
--- a/src/models/shape/line.zig
+++ b/src/models/shape/line.zig
@@ -1,24 +1,17 @@
 const std = @import("std");
 const Object = @import("../Object.zig");
 const Property = @import("../Property.zig").Property;
-const PropertyData = @import("../Property.zig").Data;
 const Rect_f = @import("../basic_models.zig").Rect_f;
+const common = @import("common.zig");
 const shape_mod = @import("shape.zig");
 
-/// Свойства фигуры по умолчанию.
+/// Свойства фигуры по умолчанию (добавляются к общим).
 pub const default_shape_properties = [_]Property{
     .{ .data = .{ .end_point = .{ .x = 100, .y = 200 } } },
 };
 
-/// Теги обязательных свойств.
-pub fn getRequiredTags() []const std.meta.Tag(PropertyData) {
-    return &([_]std.meta.Tag(PropertyData){std.meta.activeTag(default_shape_properties[0].data)});
-}
-
-/// Добавляет к объекту свойства по умолчанию для линии.
-pub fn appendDefaultShapeProperties(allocator: std.mem.Allocator, obj: *Object) !void {
-    for (default_shape_properties) |prop| try obj.properties.append(allocator, prop);
-}
+/// Теги обязательных свойств = теги из default_shape_properties.
+pub const required_tags = common.tagsFromProperties(&default_shape_properties);
 
 /// Локальные границы: от (0,0) до end_point.
 pub fn getLocalBounds(obj: *const Object) !Rect_f {
diff --git a/src/models/shape/shape.zig b/src/models/shape/shape.zig
index d350458..aff5905 100644
--- a/src/models/shape/shape.zig
+++ b/src/models/shape/shape.zig
@@ -4,19 +4,37 @@ const Property = @import("../Property.zig").Property;
 const PropertyData = @import("../Property.zig").Data;
 const defaultCommonProperties = Object.defaultCommonProperties;
 const basic_models = @import("../basic_models.zig");
+const Point2_f = basic_models.Point2_f;
 const line = @import("line.zig");
 const ellipse = @import("ellipse.zig");
 const broken = @import("broken.zig");
-pub const Rect = basic_models.Rectf;
+pub const Rect = basic_models.Rect_f;
+
+/// Добавляет к объекту список свойств фигуры. Для .points дублирует слайс (объект владеет).
+fn appendShapeProperties(allocator: std.mem.Allocator, obj: *Object, props: []const Property) !void {
+    for (props) |prop| {
+        if (prop.data == .points) {
+            const pts = prop.data.points;
+            const copy = try allocator.alloc(Point2_f, pts.len);
+            @memcpy(copy, pts);
+            try obj.properties.append(allocator, .{ .data = .{ .points = copy } });
+        } else {
+            try obj.properties.append(allocator, prop);
+        }
+    }
+}
 
 /// Создаёт объект с дефолтными общими и фигурными свойствами.
 pub fn createObject(allocator: std.mem.Allocator, shape_kind: Object.ShapeKind) !Object {
     var obj = try createWithCommonProperties(allocator, shape_kind);
     errdefer obj.deinit(allocator);
     switch (shape_kind) {
-        .line => try line.appendDefaultShapeProperties(allocator, &obj),
-        .ellipse => try ellipse.appendDefaultShapeProperties(allocator, &obj),
-        .broken => try broken.appendDefaultShapeProperties(allocator, &obj),
+        .line => try appendShapeProperties(allocator, &obj, &line.default_shape_properties),
+        .ellipse => try appendShapeProperties(allocator, &obj, &ellipse.default_shape_properties),
+        .broken => {
+            try appendShapeProperties(allocator, &obj, &broken.default_shape_properties);
+            try obj.setProperty(allocator, .{ .data = .{ .fill_rgba = obj.getProperty(.stroke_rgba).?.stroke_rgba } });
+        },
     }
     return obj;
 }
@@ -42,11 +60,12 @@ pub fn ensure(obj: *const Object, expected_kind: Object.ShapeKind) !void {
     }
 }
 
+/// Обязательные теги = те свойства, которые фигура добавляет к общим (из default_shape_properties).
 fn requiredTagsFor(kind: Object.ShapeKind) []const std.meta.Tag(PropertyData) {
     return switch (kind) {
-        .line => line.getRequiredTags(),
-        .ellipse => ellipse.getRequiredTags(),
-        .broken => broken.getRequiredTags(),
+        .line => &line.required_tags,
+        .ellipse => &ellipse.required_tags,
+        .broken => &broken.required_tags,
     };
 }
 
@@ -71,7 +90,7 @@ test "getLocalBounds" {
     try std.testing.expect(line_bounds.x == 0);
     try std.testing.expect(line_bounds.y == 0);
     try std.testing.expect(line_bounds.w == 100);
-    try std.testing.expect(line_bounds.h == 0);
+    try std.testing.expect(line_bounds.h == 200);
 
     var ellipse_obj = try shape.createObject(allocator, .ellipse);
     defer ellipse_obj.deinit(allocator);
diff --git a/src/random_document.zig b/src/random_document.zig
index e59d2a4..edc60e0 100644
--- a/src/random_document.zig
+++ b/src/random_document.zig
@@ -74,16 +74,19 @@ fn randomizeObjectProperties(allocator: std.mem.Allocator, doc_size: *const Size
             } });
         },
         .broken => {
-            var points = std.ArrayList(Point2_f).empty;
+            var list = std.ArrayList(Point2_f).empty;
+            defer list.deinit(allocator);
             const n = rng.intRangeLessThan(usize, 2, 9);
             var x: f32 = 0;
             var y: f32 = 0;
             for (0..n) |_| {
-                try points.append(allocator, .{ .x = x, .y = y });
+                try list.append(allocator, .{ .x = x, .y = y });
                 x += randFloat(rng, -40, 80);
                 y += randFloat(rng, -30, 60);
             }
-            try obj.setProperty(allocator, .{ .data = .{ .points = points } });
+            const slice = try allocator.alloc(Point2_f, list.items.len);
+            @memcpy(slice, list.items);
+            try obj.setProperty(allocator, .{ .data = .{ .points = slice } });
         },
     }
 }
diff --git a/src/render/cpu/broken.zig b/src/render/cpu/broken.zig
index dcbc2fa..e2d2e7d 100644
--- a/src/render/cpu/broken.zig
+++ b/src/render/cpu/broken.zig
@@ -17,7 +17,7 @@ pub fn draw(
     allocator: std.mem.Allocator,
 ) !void {
     const p_prop = obj.getProperty(.points) orelse return;
-    const pts = p_prop.points.items;
+    const pts = p_prop.points;
     if (pts.len < 2) return;
     const stroke = if (obj.getProperty(.stroke_rgba)) |s| pipeline.rgbaToPma(s.stroke_rgba) else default_stroke;
     const thickness = if (obj.getProperty(.thickness)) |t| t.thickness else default_thickness;
diff --git a/src/ui/canvas_view.zig b/src/ui/canvas_view.zig
index f8e7646..76d86de 100644
--- a/src/ui/canvas_view.zig
+++ b/src/ui/canvas_view.zig
@@ -6,6 +6,7 @@ const Document = @import("../models/Document.zig");
 const Property = @import("../models/Property.zig").Property;
 const PropertyData = @import("../models/Property.zig").Data;
 const Rect_i = @import("../models/basic_models.zig").Rect_i;
+const Point2_f = @import("../models/basic_models.zig").Point2_f;
 const Tool = @import("../toolbar/Tool.zig");
 const RenderStats = @import("../render/RenderStats.zig");
 const icons = @import("../icons.zig");
@@ -564,10 +565,12 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                 }
             },
             .points => |points| {
-                var list = points.clone(canvas.allocator) catch {
-                    dvui.label(@src(), "Points: {d}", .{points.items.len}, .{});
+                var list = std.ArrayList(Point2_f).empty;
+                list.appendSlice(canvas.allocator, points) catch {
+                    dvui.label(@src(), "Points: {d}", .{points.len}, .{});
                     return;
                 };
+                defer list.deinit(canvas.allocator);
                 dvui.label(@src(), "Points: {d}", .{list.items.len}, .{});
 
                 var changed = false;
@@ -677,13 +680,13 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                 }
 
                 if (changed) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .points = list } }) catch {
-                        list.deinit(canvas.allocator);
+                    const slice = canvas.allocator.alloc(Point2_f, list.items.len) catch return;
+                    @memcpy(slice, list.items);
+                    obj.setProperty(canvas.allocator, .{ .data = .{ .points = slice } }) catch {
+                        canvas.allocator.free(slice);
                         return;
                     };
                     canvas.requestRedraw();
-                } else {
-                    list.deinit(canvas.allocator);
                 }
             },
             .fill_rgba => |rgba| {