Add support for drawing a MultiCanvas on another Canvas

Signed-off-by: martinRenou <[email protected]>

Author: martinRenou

ipycanvas/canvas.py

@@ -413,8 +413,8 @@ def set_line_dash(self, segments):
     # Image methods
     def draw_image(self, image, x=0, y=0, width=None, height=None):
         """Draw an ``image`` on the Canvas at the coordinates (``x``, ``y``) and scale it to (``width``, ``height``)."""
-        if (not isinstance(image, (Canvas, Image))):
-            raise TypeError('The image argument should be an Image widget or a Canvas widget')
+        if (not isinstance(image, (Canvas, MultiCanvas, Image))):
+            raise TypeError('The image argument should be an Image, a Canvas or a MultiCanvas widget')
 
         if width is not None and height is None:
             height = width

src/widget.ts

@@ -219,7 +219,7 @@ class CanvasModel extends DOMWidgetModel {
 
     const image = await unpack_models(serializedImage, this.widget_manager);
 
-    if (image instanceof CanvasModel) {
+    if (image instanceof CanvasModel || image instanceof MultiCanvasModel) {
       this._drawImage(image.canvas, x, y, width, height);
       return;
     }