# Canvas Expander , resize canvas based on all paintlayers and active view **URL:** \ **Category:** Plugins Development\ **Created:** [October 15, 2023, 10:33pm UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109 "2023-10-15T22:33:01Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![TLTAA](https://krita-artists.org/user_avatar/krita-artists.org/tltaa/32/92349_2.png) [@TLTAA](https://krita-artists.org/u/TLTAA)\ **Post date:** [October 15, 2023, 10:33pm UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/1 "2023-10-15T22:33:02Z")
# Canvas Expander A krita extension that supplies helpful canvas related operations to help speed up workflow. ## Features - Resize the document to fit all paint layers and viewport bounds, With options for just the layers or just the selected layer. - Scale the document to zoom, dynamically re-scale the document based on current zoom making it now 100% zoom. Its ‘Scale Image To New size…’ without the menus! ## Useage & Shortcuts Tools \> Scripts \> Canvas Expander **ctrl+alt+shift+e** Tools \> Scripts \> Canvas Expander (Current Layer Only) **ctrl+alt+shift+r** Tools \> Scripts \> Canvas Expander (layers Only) **ctrl+alt+shift+t** Tools \> Scripts \> Canvas Expander (Scale to zoom) **ctrl+alt+shift+s** ## Installation ### Krita’s own guide > **[Managing Python plugins](https://docs.krita.org/en/user_manual/python_scripting/install_custom_python_plugin.html)** > > How to install a custom Python plugin. ### Current Release > **[Release v0.1.2-alpha · bmcgruddy/canvas-expander](https://github.com/bmcgruddy/canvas-expander/releases/tag/v0.1.2)** > > Contribute to bmcgruddy/canvas-expander development by creating an account on GitHub. ---
**Author:** ![freyalupen](https://krita-artists.org/user_avatar/krita-artists.org/freyalupen/32/47913_2.png) [@freyalupen](https://krita-artists.org/u/freyalupen)\ **Post date:** [October 16, 2023, 1:11am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/2 "2023-10-16T01:11:49Z")
1. You probably want Document.resizeImage(x,y, w,h). It’s the same thing but all at once. 2. Node.bounds() should match the contents of the layer, as far as I know. 3. You can convert the widget size to zoomed image size like this: ```auto zoom = view.canvas().zoomLevel() scale = window.qwindow().devicePixelRatioF() dpi = documement.resolution() realZoom = zoom*scale / (dpi/72) # width/height of the window, in zoomed image pixels new_width = int(w_width * scale / realZoom) new_height = int(w_height * scale / realZoom) ``` - Also, if you want to use the viewport’s size instead of the window’s: `viewport = window.qwindow().centralWidget()` - One more thing, you can combine QRects like this: `combined_bounds = combined_bounds.united(node.bounds())` ---
**Author:** ![TLTAA](https://krita-artists.org/user_avatar/krita-artists.org/tltaa/32/92349_2.png) [@TLTAA](https://krita-artists.org/u/TLTAA)\ **Post date:** [October 16, 2023, 3:22am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/3 "2023-10-16T03:22:40Z")
thank you , now have working code just need to spend a little time rewriting into a functioning extension. 😀 ---
**Author:** ![AhabGreybeard](https://krita-artists.org/user_avatar/krita-artists.org/ahabgreybeard/32/2969_2.png) [@AhabGreybeard](https://krita-artists.org/u/AhabGreybeard)\ **Post date:** [October 16, 2023, 6:31am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/4 "2023-10-16T06:31:26Z")
Hello @TLTAA and welcome to the forum 🙂 > [@TLTAA](#): > > grow & shrink the canvas to fit all paint layers. Would it be possible to also have a “Resize canvas to currently selected layer content” function? I’d find that very useful if you could. ---
**Author:** ![TLTAA](https://krita-artists.org/user_avatar/krita-artists.org/tltaa/32/92349_2.png) [@TLTAA](https://krita-artists.org/u/TLTAA)\ **Post date:** [October 16, 2023, 6:57am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/5 "2023-10-16T06:57:43Z")
@AhabGreybeard I’ll add it to my notes 😉 just checking does this request differ from “image \> trim to current layer”? It only just occurred to me that said operation “trims” the hidden parts of the other layers (which I’m guessing you’d like to avoid). ---
**Author:** ![AhabGreybeard](https://krita-artists.org/user_avatar/krita-artists.org/ahabgreybeard/32/2969_2.png) [@AhabGreybeard](https://krita-artists.org/u/AhabGreybeard)\ **Post date:** [October 16, 2023, 7:01am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/6 "2023-10-16T07:01:41Z")
Trim resizes the canvas and also removes off-canvas content from around the specified region. It’s a useful function but not what I need in some situations. Hence my desire for ‘Resize to Current Layer’ but with no removal of any content from anywhere. ---
**Author:** ![TLTAA](https://krita-artists.org/user_avatar/krita-artists.org/tltaa/32/92349_2.png) [@TLTAA](https://krita-artists.org/u/TLTAA)\ **Post date:** [October 16, 2023, 7:07am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/7 "2023-10-16T07:07:25Z")
@AhabGreybeard ah thought that may be the case happy to oblige. ---
**Author:** ![AhabGreybeard](https://krita-artists.org/user_avatar/krita-artists.org/ahabgreybeard/32/2969_2.png) [@AhabGreybeard](https://krita-artists.org/u/AhabGreybeard)\ **Post date:** [October 16, 2023, 7:08am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/8 "2023-10-16T07:08:14Z")
I’ve been asking for this for a long time. THANK YOU! 👍🙂 ---
**Author:** ![TLTAA](https://krita-artists.org/user_avatar/krita-artists.org/tltaa/32/92349_2.png) [@TLTAA](https://krita-artists.org/u/TLTAA)\ **Post date:** [October 16, 2023, 9:53am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/9 "2023-10-16T09:53:34Z")
@AhabGreybeard version 0.1.2 made with you’re request. 😇 ---
**Author:** ![AhabGreybeard](https://krita-artists.org/user_avatar/krita-artists.org/ahabgreybeard/32/2969_2.png) [@AhabGreybeard](https://krita-artists.org/u/AhabGreybeard)\ **Post date:** [October 16, 2023, 10:07am UTC](https://krita-artists.org/t/canvas-expander-resize-canvas-based-on-all-paintlayers-and-active-view/76109/10 "2023-10-16T10:07:03Z")
Thank you @TLTAA 👍 I’ll try this later in the day when I have time to concentrate on it and I’ll let you know if I have any difficulties with it.