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How do I cut a shape in two along a line?


metawops
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I‘m quite new to Affinity Designer on iPad and watched the tutorial videos.

I wasn‘t able to find the solution to a rather simple challenge I currently have: I have a simple rectangle (as an example for a closed shape) and want to cut it in two parts along a straight (in the easiest case) line so that two shapes (not necessarily two rectangles) are being created.

I know about the boolean operations but those need at least two closed shapes and don‘t work with one shape and one line (i.e. a closed shape and an open shape). – Or do they?

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36 minutes ago, metawops said:

and don‘t work with one shape and one line (i.e. a closed shape and an open shape). – Or do they?

Just convert layers to Curve Layers and expand strokes, then Subtract to create separate shapes. If you just want the line to be removed from the shape (still a single shape), you just set the lines layer blend mode to Erase.

IPad Pro 10.5/512GB   lpadOS 15.3 Apple Pencil (1st gen), Affinity Photo 1.10.5 Affinity Design 1.10.5

Official Online iPad Help documents (multi-lingual) here: https://affinity.help/

PDF Help files available here:

Affinity Photo 1.9.2-help.pdf 

Affinity Designer Help File 1.9.7.pdf

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Awesome, thanks so much!!

I see that the „line“ you used actually isn‘t a one dimensional line in the mathematical sense but in fact another closed curve with a thickness.

So I tried with a straight line with thickness 0.1 and it worked nicely. However, doing it with a line with zero thickness failed. 🤷‍♂️ So I guess it‘s not possible to create, for example, two triangles that have exactly the same area as the rectangle that was cut along one of its diagonal – mathematically speaken?

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You can just break the nodes and then rejoin them in separate layers.

IPad Pro 10.5/512GB   lpadOS 15.3 Apple Pencil (1st gen), Affinity Photo 1.10.5 Affinity Design 1.10.5

Official Online iPad Help documents (multi-lingual) here: https://affinity.help/

PDF Help files available here:

Affinity Photo 1.9.2-help.pdf 

Affinity Designer Help File 1.9.7.pdf

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43 minutes ago, metawops said:

I see that the „line“ you used actually isn‘t a one dimensional line in the mathematical sense but in fact another closed curve with a thickness.

If you want to use a closed curve with no thickness, you need to extend its ends outside of the shape that you’re cutting.

A2939075-4622-4A0A-96B7-54F99692B222.jpeg.71a5b993c9a6252e3409f61b75db4f9e.jpeg
The ‘Divide’ command will automatically close any selected curves that are open, by joining the ends with a straight line segment.

54156C2D-F9E4-4A6B-A059-AA970927DA30.jpeg.66868acf038c9845281f81ddf147f422.jpeg
To restore the original fill to the cut-off part of the rectangle, copy the filled part and ‘Paste Style’ to the unfilled part.

36B59065-F12F-40DA-A726-EBF30639CFFF.jpeg.af28cffa975ead3d253e8986758cc303.jpeg
 

To finish off, you need to delete the leftover part of the cutting shape. All very tedious!

Alfred spacer.png
Affinity Designer/Photo/Publisher for Windows 1.10 • Windows 10 Home/Pro
Affinity Photo for iPad 1.10 • Designer for iPad 1.10 • iPadOS 15.5 (iPad Air 2)

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20 hours ago, metawops said:

I‘m quite new to Affinity Designer on iPad and watched the tutorial videos.

I wasn‘t able to find the solution to a rather simple challenge I currently have: I have a simple rectangle (as an example for a closed shape) and want to cut it in two parts along a straight (in the easiest case) line so that two shapes (not necessarily two rectangles) are being created.

I know about the boolean operations but those need at least two closed shapes and don‘t work with one shape and one line (i.e. a closed shape and an open shape). – Or do they?

Something like this?

 

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