### Function

# Gtk DrawingAreaDrawFunc

#### Declaration

    void
    (* GtkDrawingAreaDrawFunc) (
      GtkDrawingArea* drawing_area,
      cairo_t* cr,
      int width,
      int height,
      gpointer user_data
    )

#### Description [src]

Whenever `drawing_area` needs to redraw, this function will be called.

This function should exclusively redraw the contents of the drawing area and must not call any widget functions that cause changes.

#### Parameters

`drawing_area`

  Type: `GtkDrawingArea`

  The `GtkDrawingArea` to redraw.

  The data is owned by the caller of the function.

`cr`

  Type: `cairo_t`

  The context to draw to.

  The data is owned by the caller of the function.

`width`

  Type: `int`

  The actual width of the contents. This value will be at least as wide as GtkDrawingArea:width.

`height`

  Type: `int`

  The actual height of the contents. This value will be at least as wide as GtkDrawingArea:height.

`user_data`

  Type: `gpointer`

  User data.

  The argument can be `NULL`.
  The data is owned by the caller of the function.