Fix memory leaks found by DebugAllocator.

When allocating memory it remebers where memory was allocated but it only
for leaks in .deinit(). So not calling it is a sure way to miss a bunch of leaks.

deinit() returns if it found leaks but we don't really care. Its usefull for tests but not here.

build.zig

@@ -8,8 +8,8 @@ pub fn build(b: *std.Build) void {
 
     const exe = b.addExecutable(.{
         .name = "Zivro",
-        .use_llvm = true,
+        // .use_llvm = true,
-        .use_lld = true,
+        // .use_lld = true,
         .root_module = b.createModule(.{
             .root_source_file = b.path("src/main.zig"),
             .target = target,

build.zig.zon

@@ -33,8 +33,8 @@
     // internet connectivity.
     .dependencies = .{
         .dvui = .{
-            .url = "https://github.com/david-vanderson/dvui/archive/main.tar.gz",
+            .url = "git+https://github.com/david-vanderson/dvui#edb2d5a4cd2981fca74ee5f096277b91333c1316",
-            .hash = "dvui-0.4.0-dev-AQFJmev72QC6e0ojhnW8a_wRhZDgzWWLgeyoNuIPZc2m",
+            .hash = "dvui-0.4.0-dev-AQFJmeGB3QAwun9qF76CDE5IopA4nUVRgD-IwwTsOo4H",
         },
 
         // See `zig fetch --save <url>` for a command-line interface for adding dependencies.

src/Canvas.zig

@@ -116,6 +116,7 @@ fn redraw(self: *Canvas) !void {
     }
     self._last_redraw_time_ms = std.time.milliTimestamp();
     self.frame_index += 1;
+    self.redraw_throttle_ms = @max(1, @as(u32, @intCast(self.render_engine.getStats().render_time_ns / std.time.ns_per_ms / 3)));
 }
 
 pub fn exampleReset(self: *Canvas) !void {

src/WindowContext.zig

@@ -16,15 +16,10 @@ pub const OpenDocument = struct {
     selected_object_id: ?u64 = null,
 
     pub fn init(allocator: std.mem.Allocator, self: *OpenDocument) void {
-        const default_size = basic_models.Size_f{ .w = 800, .h = 600 };
+        initWithDocument(allocator, self, .init(.{
-        self.document = Document.init(default_size);
+            .w = 800,
-        self.cpu_render = CpuRenderEngine.init(allocator, .Squares);
+            .h = 600,
-        self.canvas = Canvas.init(
+        }));
-            allocator,
-            &self.document,
-            (&self.cpu_render).renderEngine(),
-        );
-        self.selected_object_id = null;
     }
 
     pub fn initWithDocument(allocator: std.mem.Allocator, self: *OpenDocument, doc: Document) void {

src/icons.zig

@@ -1,9 +1,8 @@
 const dvui = @import("dvui");
 
-pub const line = dvui.entypo.line_graph;
+pub const line = dvui.entypo.flow_line;
 pub const ellipse = dvui.entypo.circle;
-pub const arc = dvui.entypo.loop;
+pub const broken = dvui.entypo.line_graph;
-pub const broken = dvui.entypo.flow_line;
 pub const trash = dvui.entypo.trash;
 pub const cross = dvui.entypo.cross;
 pub const plus = dvui.entypo.plus;

src/main.zig

@@ -5,7 +5,10 @@ const WindowContext = @import("WindowContext.zig");
 const ui = @import("ui/frame.zig");
 
 pub fn main() !void {
-    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    // std.heap.GeneralPurposeAllocator was renamed to DebugAllocator recently.
+    var gpa: std.heap.DebugAllocator(.{}) = .init;
+    defer _ = gpa.deinit();
+
     const allocator = gpa.allocator();
 
     var backend = try SDLBackend.initWindow(.{

src/models/Object.zig

@@ -6,7 +6,6 @@ const Object = @This();
 pub const ShapeKind = enum {
     line,
     ellipse,
-    arc,
     broken,
 };
 
@@ -34,9 +33,9 @@ shape: ShapeKind,
 properties: std.ArrayList(Property),
 children: std.ArrayList(Object),
 
-pub fn getProperty(self: Object, tag: std.meta.Tag(PropertyData)) ?*const PropertyData {
+pub fn getProperty(self: Object, comptime tag: std.meta.Tag(PropertyData)) ?@FieldType(PropertyData, @tagName(tag)) {
     for (self.properties.items) |*prop| {
-        if (std.meta.activeTag(prop.data) == tag) return &prop.data;
+        if (std.meta.activeTag(prop.data) == tag) return @field(prop.data, @tagName(tag));
     }
     return null;
 }
@@ -45,7 +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;
         }

src/models/Property.zig

@@ -15,9 +15,12 @@ pub const Data = union(enum) {
 
     size: Size_f,
     radii: Radii_f,
+    /// Процент дуги эллипса: 100 — полный эллипс, 50 — полуэллипс (0..100).
+    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,
 
@@ -37,7 +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;
@@ -45,9 +48,12 @@ 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.dupe(Point2_f, slice);
+                        break :blk copy;
+                    },
                 },
             },
             else => .{ .data = self.data },

src/models/shape/arc.zig

@@ -1,23 +0,0 @@
-const std = @import("std");
-const Object = @import("../Object.zig");
-const PropertyData = @import("../Property.zig").Data;
-const Rect_f = @import("../basic_models.zig").Rect_f;
-const shape_mod = @import("shape.zig");
-
-/// Теги обязательных свойств (arc не реализован).
-pub fn getRequiredTags() []const std.meta.Tag(PropertyData) {
-    return &[_]std.meta.Tag(PropertyData){};
-}
-
-/// Добавляет свойства по умолчанию для дуги.
-pub fn appendDefaultShapeProperties(allocator: std.mem.Allocator, obj: *Object) !void {
-    _ = allocator;
-    _ = obj;
-    return error.ArcNotImplemented;
-}
-
-/// Локальные границы дуги (не реализовано).
-pub fn getLocalBounds(obj: *const Object) !Rect_f {
-    try shape_mod.ensure(obj, .arc);
-    return error.ArcNotImplemented;
-}

src/models/shape/broken.zig

@@ -6,49 +6,15 @@ const Point2_f = @import("../basic_models.zig").Point2_f;
 const Rect_f = @import("../basic_models.zig").Rect_f;
 const shape_mod = @import("shape.zig");
 
-/// Точки ломаной по умолчанию.
+/// Свойства фигуры по умолчанию (добавляются к общим). points — слайс на статический массив.
-pub const default_points = [_]Point2_f{
+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{
-/// Теги обязательных свойств.
+    .{ .data = .{ .points = &default_shape_properties_points } },
-pub fn getRequiredTags() []const std.meta.Tag(PropertyData) {
+    .{ .data = .{ .closed = false } },
-    return &[_]std.meta.Tag(PropertyData){
+    .{ .data = .{ .filled = true } },
-        .points,
+    .{ .data = .{ .fill_rgba = 0x000000FF } },
-    };
+};
-}
-
-/// 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 } });
-}
-
-/// 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;
-    var max_x: f32 = min_x;
-    var min_y: f32 = p.points.items[0].y;
-    var max_y: f32 = min_y;
-    for (p.points.items[1..]) |pt| {
-        min_x = @min(min_x, pt.x);
-        max_x = @max(max_x, pt.x);
-        min_y = @min(min_y, pt.y);
-        max_y = @max(max_y, pt.y);
-    }
-    return .{
-        .x = min_x,
-        .y = min_y,
-        .w = max_x - min_x,
-        .h = max_y - min_y,
-    };
-}

src/models/shape/ellipse.zig

@@ -1,33 +1,14 @@
 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 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 } },
+    .{ .data = .{ .closed = true } },
+    .{ .data = .{ .filled = false } },
+    .{ .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);
-}
-
-/// Локальные границы эллипса: [-radii.x, -radii.y] .. [radii.x, radii.y].
-pub fn getLocalBounds(obj: *const Object) !Rect_f {
-    try shape_mod.ensure(obj, .ellipse);
-    const r = obj.getProperty(.radii).?;
-    return .{
-        .x = -r.radii.x,
-        .y = -r.radii.y,
-        .w = 2 * r.radii.x,
-        .h = 2 * r.radii.y,
-    };
-}

src/models/shape/line.zig

@@ -1,37 +1,10 @@
 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 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);
-}
-
-/// Локальные границы: от (0,0) до end_point.
-pub fn getLocalBounds(obj: *const Object) !Rect_f {
-    try shape_mod.ensure(obj, .line);
-    const ep = obj.getProperty(.end_point).?;
-    const min_x = @min(0, ep.end_point.x);
-    const max_x = @max(0, ep.end_point.x);
-    const min_y = @min(0, ep.end_point.y);
-    const max_y = @max(0, ep.end_point.y);
-    return .{
-        .x = min_x,
-        .y = min_y,
-        .w = max_x - min_x,
-        .h = max_y - min_y,
-    };
-}

src/models/shape/shape.zig

@@ -4,22 +4,36 @@ 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");
-const arc = @import("arc.zig");
+pub const Rect = basic_models.Rect_f;
 
-pub const Rect = basic_models.Rectf;
+/// 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.dupe(Point2_f, 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),
+        .line => try appendShapeProperties(allocator, &obj, &line.default_shape_properties),
-        .ellipse => try ellipse.appendDefaultShapeProperties(allocator, &obj),
+        .ellipse => try appendShapeProperties(allocator, &obj, &ellipse.default_shape_properties),
-        .broken => try broken.appendDefaultShapeProperties(allocator, &obj),
+        .broken => {
-        .arc => try arc.appendDefaultShapeProperties(allocator, &obj),
+            try appendShapeProperties(allocator, &obj, &broken.default_shape_properties);
+            try obj.setProperty(allocator, .{ .data = .{ .fill_rgba = obj.getProperty(.stroke_rgba).? } });
+        },
     }
     return obj;
 }
@@ -35,62 +49,3 @@ fn createWithCommonProperties(allocator: std.mem.Allocator, shape_kind: Object.S
         .children = std.ArrayList(Object).empty,
     };
 }
-
-/// Проверяет тип объекта и наличие обязательных свойств.
-pub fn ensure(obj: *const Object, expected_kind: Object.ShapeKind) !void {
-    if (obj.shape != expected_kind) return error.WrongShapeKind;
-    const tags = requiredTagsFor(expected_kind);
-    for (tags) |tag| {
-        if (obj.getProperty(tag) == null) return error.MissingRequiredProperty;
-    }
-}
-
-fn requiredTagsFor(kind: Object.ShapeKind) []const std.meta.Tag(PropertyData) {
-    return switch (kind) {
-        .line => line.getRequiredTags(),
-        .ellipse => ellipse.getRequiredTags(),
-        .broken => broken.getRequiredTags(),
-        .arc => arc.getRequiredTags(),
-    };
-}
-
-/// Локальные границы (AABB).
-pub fn getLocalBounds(obj: *const Object) !Rect {
-    return switch (obj.shape) {
-        .line => line.getLocalBounds(obj),
-        .ellipse => ellipse.getLocalBounds(obj),
-        .broken => broken.getLocalBounds(obj),
-        .arc => arc.getLocalBounds(obj),
-    };
-}
-
-test "getLocalBounds" {
-    const shape = @This();
-    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    defer _ = gpa.deinit();
-    const allocator = gpa.allocator();
-
-    var line_obj = try shape.createObject(allocator, .line);
-    defer line_obj.deinit(allocator);
-    const line_bounds = try getLocalBounds(&line_obj);
-    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);
-
-    var ellipse_obj = try shape.createObject(allocator, .ellipse);
-    defer ellipse_obj.deinit(allocator);
-    const ellipse_bounds = try getLocalBounds(&ellipse_obj);
-    try std.testing.expect(ellipse_bounds.x == -50);
-    try std.testing.expect(ellipse_bounds.y == -50);
-    try std.testing.expect(ellipse_bounds.w == 100);
-    try std.testing.expect(ellipse_bounds.h == 100);
-
-    var broken_obj = try shape.createObject(allocator, .broken);
-    defer broken_obj.deinit(allocator);
-    const broken_bounds = try getLocalBounds(&broken_obj);
-    try std.testing.expect(broken_bounds.x == 0);
-    try std.testing.expect(broken_bounds.y == 0);
-    try std.testing.expect(broken_bounds.w == 80);
-    try std.testing.expect(broken_bounds.h == 60);
-}

src/random_document.zig

@@ -74,18 +74,20 @@ 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.dupe(Point2_f, list.items);
+            errdefer allocator.free(slice);
+            try obj.setProperty(allocator, .{ .data = .{ .points = slice } });
         },
-        .arc => {},
     }
 }
 
@@ -98,6 +100,7 @@ pub fn addRandomShapes(doc: *Document, allocator: std.mem.Allocator, rng: std.Ra
     for (0..n_root) |_| {
         if (total_count >= max_total) break;
         var obj = try shape.createObject(allocator, randomShapeKind(rng));
+        defer obj.deinit(allocator);
         try randomizeObjectProperties(allocator, &doc.size, &obj, rng);
         try doc.addObject(allocator, obj);
         total_count += 1;
@@ -115,6 +118,7 @@ pub fn addRandomShapes(doc: *Document, allocator: std.mem.Allocator, rng: std.Ra
         for (0..n_children) |_| {
             if (total_count >= max_total) break;
             var child = try shape.createObject(allocator, randomShapeKind(rng));
+            defer child.deinit(allocator);
             try randomizeObjectProperties(allocator, &doc.size, &child, rng);
             try obj.addChild(allocator, child, &doc.next_object_id);
             total_count += 1;

src/render/CpuRenderEngine.zig

@@ -66,9 +66,7 @@ fn renderGradient(self: CpuRenderEngine, pixels: []Color.PMA, width: u32, height
     }
 }
 
-fn renderSquares(self: CpuRenderEngine, pixels: []Color.PMA, canvas_size: Size_i, visible_rect: Rect_i) void {
+fn renderSquares(pixels: []Color.PMA, canvas_size: Size_i, visible_rect: Rect_i) void {
-    _ = self;
-
     const colors = [_]Color.PMA{
         .{ .r = 255, .g = 0, .b = 0, .a = 255 },
         .{ .r = 255, .g = 165, .b = 0, .a = 255 },
@@ -169,10 +167,10 @@ pub fn example(self: CpuRenderEngine, canvas_size: Size_i, visible_rect: Rect_i)
 
     switch (self.type) {
         .Gradient => self.renderGradient(pixels, width, height, full_w, full_h, visible_rect),
-        .Squares => self.renderSquares(pixels, canvas_size, visible_rect),
+        .Squares => renderSquares(pixels, canvas_size, visible_rect),
     }
 
-    return try dvui.textureCreate(pixels, width, height, .nearest);
+    return try dvui.textureCreate(pixels, width, height, .nearest, .rgba_8_8_8_8);
 }
 
 pub fn renderEngine(self: *CpuRenderEngine) RenderEngine {
@@ -191,7 +189,7 @@ pub fn renderDocument(self: *CpuRenderEngine, document: *const Document, canvas_
     try cpu_draw.drawDocument(pixels, width, height, visible_rect, document, canvas_size, self._allocator);
     self._renderStats.render_time_ns = t.read();
 
-    return try dvui.textureCreate(pixels, width, height, .nearest);
+    return try dvui.textureCreate(pixels, width, height, .nearest, .rgba_8_8_8_8);
 }
 
 pub fn getStats(self: CpuRenderEngine) RenderStats {

src/render/cpu/arc.zig

@@ -1,8 +0,0 @@
-const Document = @import("../../models/Document.zig");
-const pipeline = @import("pipeline.zig");
-const DrawContext = pipeline.DrawContext;
-
-const Object = Document.Object;
-
-/// Дуга (не реализовано).
-pub fn draw(_: *DrawContext, _: *const Object) void {}

src/render/cpu/broken.zig

@@ -16,14 +16,13 @@ pub fn draw(
     obj: *const Object,
     allocator: std.mem.Allocator,
 ) !void {
-    const p_prop = obj.getProperty(.points) orelse return;
+    const pts = obj.getProperty(.points) orelse return;
-    const pts = p_prop.points.items;
     if (pts.len < 2) return;
-    const stroke = if (obj.getProperty(.stroke_rgba)) |s| pipeline.rgbaToPma(s.stroke_rgba) else default_stroke;
+    const stroke = if (obj.getProperty(.stroke_rgba)) |stroke_rgba| pipeline.rgbaToPma(stroke_rgba) else default_stroke;
-    const thickness = if (obj.getProperty(.thickness)) |t| t.thickness else default_thickness;
+    const thickness = obj.getProperty(.thickness) orelse default_thickness;
-    const closed = if (obj.getProperty(.closed)) |c| c.closed else false;
+    const closed = obj.getProperty(.closed) orelse false;
-    const filled = if (obj.getProperty(.filled)) |f| f.filled else true;
+    const filled = obj.getProperty(.filled) orelse true;
-    const fill_color = if (obj.getProperty(.fill_rgba)) |f| pipeline.rgbaToPma(f.fill_rgba) else default_fill;
+    const fill_color = if (obj.getProperty(.fill_rgba)) |fill_rgba| pipeline.rgbaToPma(fill_rgba) else default_fill;
 
     const buffer = try allocator.alloc(Color.PMA, ctx.buf_width * ctx.buf_height);
     @memset(buffer, .{ .r = 0, .g = 0, .b = 0, .a = 0 });

src/render/cpu/draw.zig

@@ -4,7 +4,6 @@ const pipeline = @import("pipeline.zig");
 const line = @import("line.zig");
 const ellipse = @import("ellipse.zig");
 const broken = @import("broken.zig");
-const arc = @import("arc.zig");
 const basic_models = @import("../../models/basic_models.zig");
 const Rect_i = basic_models.Rect_i;
 const Size_i = basic_models.Size_i;
@@ -14,7 +13,7 @@ const DrawContext = pipeline.DrawContext;
 const Transform = pipeline.Transform;
 
 fn isVisible(obj: *const Object) bool {
-    return if (obj.getProperty(.visible)) |p| p.visible else true;
+    return obj.getProperty(.visible) orelse true;
 }
 
 fn drawObject(
@@ -30,9 +29,8 @@ fn drawObject(
 
     switch (obj.shape) {
         .line => line.draw(ctx, obj),
-        .ellipse => ellipse.draw(ctx, obj),
+        .ellipse => try ellipse.draw(ctx, obj, allocator),
         .broken => try broken.draw(ctx, obj, allocator),
-        .arc => arc.draw(ctx, obj),
     }
 
     for (obj.children.items) |*child| {

src/render/cpu/ellipse.zig

@@ -1,23 +1,36 @@
 const std = @import("std");
+const std_math = std.math;
 const Document = @import("../../models/Document.zig");
 const pipeline = @import("pipeline.zig");
+const line = @import("line.zig");
 const DrawContext = pipeline.DrawContext;
 const Color = @import("dvui").Color;
+const basic_models = @import("../../models/basic_models.zig");
+const Point2_f = basic_models.Point2_f;
 
 const Object = Document.Object;
 const default_stroke: Color.PMA = .{ .r = 0, .g = 0, .b = 0, .a = 255 };
+const default_fill: Color.PMA = .{ .r = 0, .g = 0, .b = 0, .a = 0 };
 const default_thickness: f32 = 2.0;
 
-/// Эллипс с центром (0,0) и полуосями radii (обводка с учётом thickness).
+/// Эллипс с центром (0,0) и полуосями radii. Обводка — полоса расстояния до контура (чёткая линия, не круги).
-pub fn draw(ctx: *DrawContext, obj: *const Object) void {
+/// arc_percent: 100 — полный эллипс, иначе одна дуга; обход в коде от (0,ry) по квадрантам (визуально может казаться от низа против часовой из‑за экранной Y).
-    const r_prop = obj.getProperty(.radii) orelse return;
+/// Отрисовка в отдельный буфер и один composite, чтобы при alpha<255 пиксели не накладывались несколько раз.
-    const rx = r_prop.radii.x;
+pub fn draw(ctx: *DrawContext, obj: *const Object, allocator: std.mem.Allocator) !void {
-    const ry = r_prop.radii.y;
+    const radii = obj.getProperty(.radii) orelse return;
+    const rx = radii.x;
+    const ry = radii.y;
     if (rx <= 0 or ry <= 0) 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;
 
-    // Полуширина обводки в нормализованных единицах (d = (x/rx)² + (y/ry)², граница при d=1).
+    const stroke = if (obj.getProperty(.stroke_rgba)) |stroke_rgba| pipeline.rgbaToPma(stroke_rgba) else default_stroke;
+    const thickness = if (obj.getProperty(.thickness)) |thickness| thickness else default_thickness;
+    const arc_percent = std_math.clamp(if (obj.getProperty(.arc_percent)) |arc_percent| arc_percent else 100.0, 0.0, 100.0);
+    const closed = obj.getProperty(.closed) orelse true;
+    const filled = obj.getProperty(.filled) orelse false;
+    const fill_color = if (obj.getProperty(.fill_rgba)) |fill_rgba| pipeline.rgbaToPma(fill_rgba) else default_fill;
+    const do_fill = filled and (closed or arc_percent >= 100.0);
+
+    const t = &ctx.transform;
     const min_r = @min(rx, ry);
     const half_norm = thickness / (2.0 * min_r);
     const inner = @max(0.0, 1.0 - half_norm);
@@ -25,19 +38,18 @@ pub fn draw(ctx: *DrawContext, obj: *const Object) void {
     const d_inner_sq = inner * inner;
     const d_outer_sq = outer * outer;
 
-    const corners = [_]struct { x: f32, y: f32 }{
+    const margin = 1.0 + half_norm;
-        .{ .x = -rx, .y = -ry },
+    const corners = [_]Point2_f{
-        .{ .x = rx, .y = -ry },
+        .{ .x = -rx * margin, .y = -ry * margin },
-        .{ .x = rx, .y = ry },
+        .{ .x = rx * margin, .y = -ry * margin },
-        .{ .x = -rx, .y = ry },
+        .{ .x = rx * margin, .y = ry * margin },
+        .{ .x = -rx * margin, .y = ry * margin },
     };
-    const w0 = ctx.localToWorld(corners[0].x, corners[0].y);
+    var min_bx: f32 = std_math.inf(f32);
-    const b0 = ctx.worldToBufferF(w0.x, w0.y);
+    var min_by: f32 = std_math.inf(f32);
-    var min_bx: f32 = b0.x;
+    var max_bx: f32 = -std_math.inf(f32);
-    var min_by: f32 = b0.y;
+    var max_by: f32 = -std_math.inf(f32);
-    var max_bx: f32 = b0.x;
+    for (corners) |c| {
-    var max_by: f32 = b0.y;
-    for (corners[1..]) |c| {
         const w = ctx.localToWorld(c.x, c.y);
         const b = ctx.worldToBufferF(w.x, w.y);
         min_bx = @min(min_bx, b.x);
@@ -47,50 +59,58 @@ pub fn draw(ctx: *DrawContext, obj: *const Object) void {
     }
     const buf_w: i32 = @intCast(ctx.buf_width);
     const buf_h: i32 = @intCast(ctx.buf_height);
-    const x0: i32 = @max(0, @as(i32, @intFromFloat(std.math.floor(min_bx))));
+    const x0: i32 = @max(0, @as(i32, @intFromFloat(std_math.floor(min_bx))));
-    const y0: i32 = @max(0, @as(i32, @intFromFloat(std.math.floor(min_by))));
+    const y0: i32 = @max(0, @as(i32, @intFromFloat(std_math.floor(min_by))));
-    const x1: i32 = @min(buf_w, @as(i32, @intFromFloat(std.math.ceil(max_bx))) + 1);
+    const x1: i32 = @min(buf_w, @as(i32, @intFromFloat(std_math.ceil(max_bx))) + 1);
-    const y1: i32 = @min(buf_h, @as(i32, @intFromFloat(std.math.ceil(max_by))) + 1);
+    const y1: i32 = @min(buf_h, @as(i32, @intFromFloat(std_math.ceil(max_by))) + 1);
+
+    const buffer = try allocator.alloc(Color.PMA, ctx.buf_width * ctx.buf_height);
+    @memset(buffer, .{ .r = 0, .g = 0, .b = 0, .a = 0 });
+    defer allocator.free(buffer);
+
+    var stroke_ctx = ctx.*;
+    stroke_ctx.pixels = buffer;
+    stroke_ctx.replace_mode = true;
+
+    if (do_fill) {
+        stroke_ctx.startFill(allocator) catch return;
+    }
 
-    // Один раз считаем аффин buffer -> local, чтобы в цикле не вызывать cos/sin и лишние функции.
-    const t = &ctx.transform;
-    const ctx_sx = if (ctx.scale_x != 0) ctx.scale_x else 1.0;
-    const ctx_sy = if (ctx.scale_y != 0) ctx.scale_y else 1.0;
-    const inv_ctx_sx = 1.0 / ctx_sx;
-    const inv_ctx_sy = 1.0 / ctx_sy;
-    const vx = @as(f32, @floatFromInt(ctx.visible_rect.x));
-    const vy = @as(f32, @floatFromInt(ctx.visible_rect.y));
-    const t_sx = if (t.scale.scale_x != 0) t.scale.scale_x else 1.0;
-    const t_sy = if (t.scale.scale_y != 0) t.scale.scale_y else 1.0;
-    const ca = std.math.cos(-t.angle);
-    const sa = std.math.sin(-t.angle);
-    const dx_off = vx * inv_ctx_sx - t.position.x;
-    const dy_off = vy * inv_ctx_sy - t.position.y;
-    const loc_x_off = (dx_off * ca - dy_off * sa) / t_sx;
-    const loc_y_off = (dx_off * sa + dy_off * ca) / t_sy;
-    const m00 = inv_ctx_sx * ca / t_sx;
-    const m01 = -inv_ctx_sy * sa / t_sx;
-    const m10 = inv_ctx_sx * sa / t_sy;
-    const m11 = inv_ctx_sy * ca / t_sy;
     const inv_rx = 1.0 / rx;
     const inv_ry = 1.0 / ry;
+    const arc_len = 2.0 * std_math.pi * arc_percent / 100.0;
 
     var by: i32 = y0;
     while (by < y1) : (by += 1) {
         const buf_y = @as(f32, @floatFromInt(by)) + 0.5;
-        const row_loc_x_off = buf_y * m01 + loc_x_off;
-        const row_loc_y_off = buf_y * m11 + loc_y_off;
         var bx: i32 = x0;
         while (bx < x1) : (bx += 1) {
             const buf_x = @as(f32, @floatFromInt(bx)) + 0.5;
-            const loc_x = buf_x * m00 + row_loc_x_off;
+            const w = stroke_ctx.bufferToWorld(buf_x, buf_y);
-            const loc_y = buf_x * m10 + row_loc_y_off;
+            const loc = stroke_ctx.worldToLocal(w.x, w.y);
-            const nx = loc_x * inv_rx;
+            const nx = loc.x * inv_rx;
-            const ny = loc_y * inv_ry;
+            const ny = loc.y * inv_ry;
             const d = nx * nx + ny * ny;
-            if (d >= d_inner_sq and d <= d_outer_sq) {
+            if (d < d_inner_sq or d > d_outer_sq) continue;
-                ctx.blendPixelAtBuffer(bx, by, stroke);
+            if (arc_percent < 100.0) {
+                var diff = std_math.pi / 2.0 - std_math.atan2(ny, nx);
+                if (diff < 0) diff += 2.0 * std_math.pi;
+                if (diff > arc_len) continue;
             }
+            stroke_ctx.blendPixelAtBuffer(bx, by, stroke);
         }
     }
+
+    if (closed and arc_percent < 100.0) {
+        const end_x = rx * std_math.sin(arc_len);
+        const end_y = ry * std_math.cos(arc_len);
+        line.drawLine(&stroke_ctx, 0, 0, 0, ry, stroke, thickness, false);
+        line.drawLine(&stroke_ctx, 0, 0, end_x, end_y, stroke, thickness, false);
+    }
+
+    if (do_fill) {
+        stroke_ctx.stopFill(allocator, fill_color);
+    }
+
+    ctx.compositeDrawerContext(&stroke_ctx, t.opacity);
 }

src/render/cpu/line.zig

@@ -12,11 +12,11 @@ const default_thickness: f32 = 2.0;
 
 /// Линия от (0,0) до end_point.
 pub fn draw(ctx: *DrawContext, obj: *const Object) void {
-    const ep_prop = obj.getProperty(.end_point) orelse return;
+    const end_point = obj.getProperty(.end_point) orelse return;
-    const end_x = ep_prop.end_point.x;
+    const end_x = end_point.x;
-    const end_y = ep_prop.end_point.y;
+    const end_y = end_point.y;
-    const stroke = if (obj.getProperty(.stroke_rgba)) |s| pipeline.rgbaToPma(s.stroke_rgba) else default_stroke;
+    const stroke = if (obj.getProperty(.stroke_rgba)) |stroke_rgba| pipeline.rgbaToPma(stroke_rgba) else default_stroke;
-    const thickness = if (obj.getProperty(.thickness)) |t| t.thickness else default_thickness;
+    const thickness = obj.getProperty(.thickness) orelse default_thickness;
     drawLine(ctx, 0, 0, end_x, end_y, stroke, thickness, false);
 }
 

src/render/cpu/pipeline.zig

@@ -16,10 +16,10 @@ pub const Transform = struct {
     opacity: f32 = 1.0,
 
     pub fn init(obj: *const Document.Object) Transform {
-        const pos = if (obj.getProperty(.position)) |p| p.position else Point2_f{ .x = 0, .y = 0 };
+        const pos = obj.getProperty(.position) orelse Point2_f{ .x = 0, .y = 0 };
-        const angle = if (obj.getProperty(.angle)) |p| p.angle else 0;
+        const angle = obj.getProperty(.angle) orelse 0;
-        const scale = if (obj.getProperty(.scale)) |p| p.scale else Scale2_f{ .scale_x = 1, .scale_y = 1 };
+        const scale = obj.getProperty(.scale) orelse Scale2_f{ .scale_x = 1, .scale_y = 1 };
-        const opacity = if (obj.getProperty(.opacity)) |p| p.opacity else 1.0;
+        const opacity = obj.getProperty(.opacity) orelse 1.0;
         return .{
             .position = pos,
             .angle = angle,
@@ -273,7 +273,7 @@ const FillCanvas = struct {
         }.lessThan);
 
         // Семена: по строкам находим сегменты (пары x), пересекаем с окном буфера, берём середину сегмента.
-        var seeds = findFillSeeds(self, keys_buf.items, buf_w_i, buf_h_i, allocator) catch return;
+        var seeds = findFillSeeds(keys_buf.items, buf_w_i, buf_h_i, allocator) catch return;
         defer seeds.deinit(allocator);
 
         var stack = std.ArrayList(Point2_i).empty;
@@ -304,13 +304,11 @@ const FillCanvas = struct {
 
     /// По строкам: рёбра (подряд идущие x) → сегменты между ними. Семена — середины чётных сегментов (при чётном числе границ).
     fn findFillSeeds(
-        self: *const FillCanvas,
         keys: []const Point2_i,
         buf_w_i: i32,
         buf_h_i: i32,
         allocator: std.mem.Allocator,
     ) !std.ArrayList(Point2_i) {
-        _ = self;
         var list = std.ArrayList(Point2_i).empty;
         errdefer list.deinit(allocator);
         var segments = std.ArrayList(struct { left: i32, right: i32 }).empty;

src/toolbar/tools.zig

@@ -1,7 +1,6 @@
 const Toolbar = @import("Toolbar.zig");
 const line = @import("tools/line.zig");
 const ellipse = @import("tools/ellipse.zig");
-const arc = @import("tools/arc.zig");
 const broken = @import("tools/broken.zig");
 const icons = @import("../icons.zig");
 
@@ -16,11 +15,6 @@ pub const default_tools = [_]Toolbar.ToolDescriptor{
         .icon_tvg = icons.ellipse,
         .implementation = &ellipse.tool,
     },
-    .{
-        .name = "Arc",
-        .icon_tvg = icons.arc,
-        .implementation = &arc.tool,
-    },
     .{
         .name = "Broken line",
         .icon_tvg = icons.broken,

src/toolbar/tools/arc.zig

@@ -1,10 +0,0 @@
-const Tool = @import("../Tool.zig");
-const shape = @import("../../models/shape/shape.zig");
-
-fn onCanvasClick(ctx: *const Tool.ToolContext) !void {
-    const canvas = ctx.canvas;
-    var obj = shape.createObject(canvas.allocator, .arc) catch return;
-    defer obj.deinit(canvas.allocator);
-    try ctx.addObject(obj);
-}
-pub const tool = Tool.Tool{ .onCanvasClick = onCanvasClick };

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");
@@ -16,14 +17,15 @@ pub fn canvasView(canvas: *Canvas, selected_object_id: ?u64, content_rect_scale:
         var overlay = dvui.overlay(@src(), .{ .expand = .both });
         {
             const overlay_parent = dvui.parentGet();
+            const init_options: dvui.ScrollAreaWidget.InitOpts = .{
+                .scroll_info = &canvas.scroll,
+                .vertical_bar = .auto,
+                .horizontal_bar = .auto,
+                .process_events_after = false,
+            };
             var scroll = dvui.scrollArea(
                 @src(),
-                .{
+                init_options,
-                    .scroll_info = &canvas.scroll,
-                    .vertical_bar = .auto,
-                    .horizontal_bar = .auto,
-                    .process_events_after = false,
-                },
                 .{
                     .expand = .both,
                     .background = false,
@@ -99,7 +101,7 @@ pub fn canvasView(canvas: *Canvas, selected_object_id: ?u64, content_rect_scale:
                 }
             }
 
-            if (!scroll.init_opts.process_events_after) {
+            if (!init_options.process_events_after) {
                 if (scroll.scroll) |*sc| {
                     dvui.clipSet(sc.prevClip);
                     sc.processEventsAfter();
@@ -379,6 +381,11 @@ fn drawStatsPanel(stats: RenderStats, frame_index: u64) void {
     panel.deinit();
 }
 
+fn applyPropertyPatch(canvas: *Canvas, obj: *Document.Object, patch: Property) void {
+    obj.setProperty(canvas.allocator, patch) catch {};
+    canvas.requestRedraw();
+}
+
 fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Property, row_index: usize) void {
     const row_id: usize = row_index * 16;
     const is_even = row_index % 2 == 0;
@@ -420,8 +427,7 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                     changed = res.changed or changed;
                 }
                 if (changed) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .position = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .position = next } });
-                    canvas.requestRedraw();
                 }
             },
             .angle => |angle| {
@@ -434,8 +440,7 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                     subrow.deinit();
                     if (res.changed) {
                         next = degrees * std.math.pi / 180.0;
-                        obj.setProperty(canvas.allocator, .{ .data = .{ .angle = next } }) catch {};
+                        applyPropertyPatch(canvas, obj, .{ .data = .{ .angle = next } });
-                        canvas.requestRedraw();
                     }
                 }
             },
@@ -459,29 +464,25 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                     changed = res.changed or changed;
                 }
                 if (changed) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .scale = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .scale = next } });
-                    canvas.requestRedraw();
                 }
             },
             .visible => |v| {
                 var next = v;
                 if (dvui.checkbox(@src(), &next, "Visible", .{})) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .visible = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .visible = next } });
-                    canvas.requestRedraw();
                 }
             },
             .opacity => |opacity| {
                 var next = opacity;
                 if (dvui.sliderEntry(@src(), "{d:0.2}", .{ .value = &next, .min = 0.0, .max = 1.0, .interval = 0.01 }, .{ .expand = .horizontal })) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .opacity = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .opacity = next } });
-                    canvas.requestRedraw();
                 }
             },
             .locked => |v| {
                 var next = v;
                 if (dvui.checkbox(@src(), &next, "Locked", .{})) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .locked = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .locked = next } });
-                    canvas.requestRedraw();
                 }
             },
             .size => |size| {
@@ -504,8 +505,7 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                     changed = res.changed or changed;
                 }
                 if (changed) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .size = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .size = next } });
-                    canvas.requestRedraw();
                 }
             },
             .radii => |radii| {
@@ -528,8 +528,13 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                     changed = res.changed or changed;
                 }
                 if (changed) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .radii = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .radii = next } });
-                    canvas.requestRedraw();
+                }
+            },
+            .arc_percent => |pct| {
+                var next = pct;
+                if (dvui.sliderEntry(@src(), "{d:0.0}%", .{ .value = &next, .min = 0.0, .max = 100.0, .interval = 1.0 }, .{ .expand = .horizontal })) {
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .arc_percent = next } });
                 }
             },
             .end_point => |pt| {
@@ -552,15 +557,16 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                     changed = res.changed or changed;
                 }
                 if (changed) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .end_point = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .end_point = next } });
-                    canvas.requestRedraw();
                 }
             },
             .points => |points| {
-                var list = points.clone(canvas.allocator) catch {
+                var list = std.ArrayList(Point2_f).empty;
-                    dvui.label(@src(), "Points: {d}", .{points.items.len}, .{});
+                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;
@@ -670,13 +676,12 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                 }
 
                 if (changed) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .points = list } }) catch {
+                    const slice = canvas.allocator.dupe(Point2_f, list.items) catch return;
-                        list.deinit(canvas.allocator);
+                    obj.setProperty(canvas.allocator, .{ .data = .{ .points = slice } }) catch {
+                        canvas.allocator.free(slice);
                         return;
                     };
                     canvas.requestRedraw();
-                } else {
-                    list.deinit(canvas.allocator);
                 }
             },
             .fill_rgba => |rgba| {
@@ -694,23 +699,20 @@ fn drawPropertyEditor(canvas: *Canvas, obj: *Document.Object, prop: *const Prope
                     const res = dvui.textEntryNumber(@src(), T, .{ .value = &next, .min = @as(T, 0.0), .max = @as(T, 100.0) }, .{ .expand = .horizontal });
                     subrow.deinit();
                     if (res.changed) {
-                        obj.setProperty(canvas.allocator, .{ .data = .{ .thickness = next } }) catch {};
+                        applyPropertyPatch(canvas, obj, .{ .data = .{ .thickness = next } });
-                        canvas.requestRedraw();
                     }
                 }
             },
             .closed => |v| {
                 var next = v;
                 if (dvui.checkbox(@src(), &next, "Closed", .{})) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .closed = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .closed = next } });
-                    canvas.requestRedraw();
                 }
             },
             .filled => |v| {
                 var next = v;
                 if (dvui.checkbox(@src(), &next, "Filled", .{})) {
-                    obj.setProperty(canvas.allocator, .{ .data = .{ .filled = next } }) catch {};
+                    applyPropertyPatch(canvas, obj, .{ .data = .{ .filled = next } });
-                    canvas.requestRedraw();
                 }
             },
         }
@@ -726,12 +728,11 @@ fn drawColorEditor(canvas: *Canvas, obj: *Document.Object, rgba: u32, is_fill: b
         .{ .expand = .horizontal },
     )) {
         const next = colorToRgba(hsv.toColor());
-        if (is_fill) {
+        const patch: Property = if (is_fill)
-            obj.setProperty(canvas.allocator, .{ .data = .{ .fill_rgba = next } }) catch {};
+            .{ .data = .{ .fill_rgba = next } }
-        } else {
+        else
-            obj.setProperty(canvas.allocator, .{ .data = .{ .stroke_rgba = next } }) catch {};
+            .{ .data = .{ .stroke_rgba = next } };
-        }
+        applyPropertyPatch(canvas, obj, patch);
-        canvas.requestRedraw();
     }
 }
 
@@ -745,6 +746,7 @@ fn propertyLabel(tag: std.meta.Tag(PropertyData)) []const u8 {
         .locked => "Locked",
         .size => "Size",
         .radii => "Radii",
+        .arc_percent => "Arc %",
         .end_point => "End point",
         .points => "Points",
         .fill_rgba => "Fill color",

src/ui/left_panel.zig

@@ -19,7 +19,6 @@ fn shapeLabel(shape: Object.ShapeKind) []const u8 {
     return switch (shape) {
         .line => "Line",
         .ellipse => "Ellipse",
-        .arc => "Arc",
         .broken => "Broken line",
     };
 }
@@ -223,11 +222,13 @@ pub fn leftPanel(ctx: *WindowContext) void {
             },
         );
         {
-            dvui.label(@src(), "Objects", .{}, .{ .font = .{
+            dvui.label(@src(), "Objects", .{}, .{
-                .id = dvui.themeGet().font_heading.id,
+                .font = .{
-                .line_height_factor = dvui.themeGet().font_heading.line_height_factor,
+                    .line_height_factor = dvui.themeGet().font_heading.line_height_factor,
-                .size = dvui.themeGet().font_heading.size + 8,
+                    .size = dvui.themeGet().font_heading.size + 8,
-            }, .gravity_x = 0.5 });
+                },
+                .gravity_x = 0.5,
+            });
             var scroll = dvui.scrollArea(
                 @src(),
                 .{ .vertical = .auto, .horizontal = .auto },