How To Twirl Lines Effect in Affinity Photo / Designer Tutorial
This twirl line effect needs both Affinity Photo and Designer as it uses features in both, you can move easily back between the apps (as well as Publisher). Of course, you must purchase all of the apps to get the benefits between all parts of this suite.
Straight / Dash stroke
Draw a straight path in Designer by holding the shift key down for the pen tool. Go to the appearance panel and select the stroke (set the color to red say). Set the size of the stroke to something very large such as 800pt. Set the cap in the stroke options to the second option, join and align set to the first options. Go to the dash tab and to the bottom of the panel and enter 0.16 and enter another small value such as 0.2 in the second entry and set the phase to something small also. Right click the stroke entry and select the duplicate command to create a copy of the current stroke. Change the color for the second stroke to something else. Change the value for the dash settings for that stroke such as 0.26 etc.
Change the blending mode for the second to difference. Repeat these steps and change the stroke dash settings along with color and now you will end up with a super rainbow of colors all connected to your basic straight path.
Go to the file and edit in Photo and then you can edit your work in the raster application and as that has a load of additional features such as pattern layers, a whole range of different effects can be added. Go to the layer menu and rasterize and then you will have a pixel layer and as a pixel layer you can also select it so go to the rectangular marquee tool and select the area that you wish to use (don't select the entire design as you will get a white edge around your pattern).
Pattern layer / Effects
Go to the layer menu and new pattern layer from selection (if you don't want the entire design, you can also use the selection tools to select part of the design and use that as the source for the new layer. I would suggest that you also select the move tool and top left and set the mirror to ON. Apply effects such as twirl or distort. Once you have your design, you can always return to the original application and continue to work with the artwork via the edit in command in the file menu. You can also use the work in Publisher and perhaps add features that are only available in that application such as various text features.