> For the complete documentation index, see [llms.txt](https://docs.kivy.fun/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kivy.fun/getting-started/drawing.md). # Drawing Each widget has a canvas, i.e. a place to draw on. The canvas is a group of drawing instructions that should be executed whenever there is a change to the widget's graphical representation. You can add two types of instructions to the canvas: *context* instructions and *vertex* instructions. You can add instructions either from Python code or from the kv file (the preferred way). If you add them via the kv file, the advantage is that they are automatically updated when any property they depend on changes. In Python, you need to do this yourself. In both cases, the canvas of MyWidget is re-drawn whenever the `position` or the `size` of the widget changes. You can use the `canvas.before ` or `canvas.after ` groups to separate your instructions based on when you want them to be executed. For an in-depth look at how Kivy's graphics are handled, look `here `. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.kivy.fun/getting-started/drawing.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.