diff --git a/doc/en/scripting/ui.md b/doc/en/scripting/ui.md
index b52460a7..7ce304b8 100644
--- a/doc/en/scripting/ui.md
+++ b/doc/en/scripting/ui.md
@@ -194,6 +194,7 @@ Here, *color* can be specified in the following ways:
 | data:blit(src: Canvas, dst_x: int, dst_y: int)           | draws the src canvas at the specified coordinates       |
 | data:clear()                                             | clears the canvas                                       |
 | data:clear(*color*)                                      | fills the canvas with the specified RGBA color          |
+| data:rect(x: int, y: int, w: int, h: int, *color*)       | fills the rectangle with the specified RGBA color       |
 | data:update()                                            | applies changes to the canvas and uploads it to the GPU |
 | data:set_data(data: Bytearray | table<int>)              | replaces pixel data (width * height * 4 numbers)        |
 | data:get_data()                                          | creates a Bytearray object with the image's pixel data  |
diff --git a/doc/ru/scripting/ui.md b/doc/ru/scripting/ui.md
index d5849541..963e8b00 100644
--- a/doc/ru/scripting/ui.md
+++ b/doc/ru/scripting/ui.md
@@ -194,6 +194,7 @@ document["worlds-panel"]:clear()
 | data:blit(src: Canvas, dst_x: int, dst_y: int)           | рисует src-холст на указанных координатах                       |
 | data:clear()                                             | очищает холст                                                   |
 | data:clear(*цвет*)                                       | заполняет холст указанным RGBA цветом                           |
+| data:rect(x: int, y: int, w: int, h: int, *цвет*)        | заполняет прямоугольник указанным RGBA цветом                   |
 | data:update()                                            | применяет изменения и загружает холст в видеопамять             |
 | data:set_data(data: bytearray | table<int>)              | заменяет данные пикселей (ширина * высота * 4 чисел)            |
 | data:get_data()                                          | создаёт объект Bytearray с пиксельными данными изображения      |
diff --git a/src/graphics/core/ImageData.cpp b/src/graphics/core/ImageData.cpp
index 218428e7..8a44068d 100644
--- a/src/graphics/core/ImageData.cpp
+++ b/src/graphics/core/ImageData.cpp
@@ -16,7 +16,7 @@ ImageData::ImageData(ImageFormat format, uint width, uint height)
         default:
             throw std::runtime_error("format is not supported");
     }
-    data = std::make_unique<ubyte[]>(width * height * pixsize);
+    data = std::make_unique<ubyte[]>((width + width % 2) * (height + width % 2) * pixsize);
 }
 
 ImageData::ImageData(ImageFormat format, uint width, uint height, std::unique_ptr<ubyte[]> data) 
diff --git a/src/logic/scripting/lua/usertypes/lua_type_canvas.cpp b/src/logic/scripting/lua/usertypes/lua_type_canvas.cpp
index 52d4e5e3..54bbf654 100644
--- a/src/logic/scripting/lua/usertypes/lua_type_canvas.cpp
+++ b/src/logic/scripting/lua/usertypes/lua_type_canvas.cpp
@@ -125,7 +125,9 @@ static RGBA get_rgba(State* L, int first) {
             rgba.rgba = static_cast<uint>(tointeger(L, first));
             break;
         case 3:
-            rgba.a = static_cast<ubyte>(tointeger(L, first + 3));
+            if (lua::isnumber(L, first + 3)) {
+                rgba.a = static_cast<ubyte>(tointeger(L, first + 3));
+            }
             [[fallthrough]];
         case 2:
             rgba.r = static_cast<ubyte>(tointeger(L, first));
@@ -199,6 +201,18 @@ static int l_blit(State* L) {
     return 0;
 }
 
+static int l_rect(State* L) {
+    auto& canvas = require_canvas(L, 1);
+    auto& image = canvas.getData();
+    int x = tointeger(L, 2);
+    int y = tointeger(L, 3);
+    int w = tointeger(L, 4);
+    int h = tointeger(L, 5);
+    RGBA rgba = get_rgba(L, 6);
+    image.drawRect(x, y, w, h, glm::ivec4 {rgba.r, rgba.g, rgba.b, rgba.a});
+    return 0;
+}
+
 static int l_set_data(State* L) {
     auto& canvas = require_canvas(L, 1);
     auto& image = canvas.getData();
@@ -316,6 +330,7 @@ static std::unordered_map<std::string, lua_CFunction> methods {
     {"line", lua::wrap<l_line>},
     {"blit", lua::wrap<l_blit>},
     {"clear", lua::wrap<l_clear>},
+    {"rect", lua::wrap<l_rect>},
     {"update", lua::wrap<l_update>},
     {"create_texture", lua::wrap<l_create_texture>},
     {"unbind_texture", lua::wrap<l_unbind_texture>},