John Rostron Posted March 11, 2018 Posted March 11, 2018 This is an extension of my tutorial on Trigonometrical transformations using Filter > Distort > Equations. This one is focused on simulating flags waving in a light wind. Flags have an advantage in that they have a standard shape (width is twice the height). Edit: I have been told that this is not true. I stand corrected. To get the desired waving, I apply a sine transformation to each of the x and y-axes. The equations to apply are: x=(x+20*sin(360*y/h))/c-100*b y=y+a*(h/10)*sin(2*360*x/w)-(x/w)*h/10 I add a sideways sine wave to the x-axis as a function of the y-position. When the flag waves, the visual width is decreased, so I have added a parameter c which scales the width of the flag. The parameter b is an offset, since the left-hand corners of the flag can otherwise move outside the canvas. The y-axis also has a sine wave, depending on the x-position. The parameter a determines the magnitude of this sine wave. The final expression (-(x/w)*h/10) ensures that the fly (RHS in this case) is below the hoist (LHS here). (Definitions: hoist is the part next to the flagpole; fly is the part flying free.) Here is the UK Union Flag, plus a bit of extra space above and below to create room: And waving in the breeze: And here is a macro that implements these transformations: FlagWaving.afmacro And a macro library containing the single macro: FlagWaving.afmacros The parameters should appear when you run the macro. Parameter a controls the vertical wave; parameter b controls the horizontal offset; parameter c controls the overall horizontal scaling. This macro will not simulate a flag in too strong a wind, where the parts overlap! John Alfred, GryphonArt, Patrick Connor and 1 other 4 Quote Windows 11, Affinity Photo 2.4.2 Designer 2.4.2 and Publisher 2.4.2 (mainly Photo). CPU: Intel Core i5 8500 @ 3.00GHz. RAM: 32.0GB DDR4 @ 1063MHz, Graphics: 2047MB NVIDIA GeForce GTX 1050
PaulEC Posted March 11, 2018 Posted March 11, 2018 Quote Flags have an advantage in that they have a standard shape (width is twice the height). Sorry but this is just not correct. Flags come in all sorts of different shapes and sizes. Just Google "flags" and take a look! John Rostron and Alfred 2 Quote Acer XC-895 : Core i5-10400 Hexa-core 2.90 GHz : 32GB RAM : Intel UHD Graphics 630 – Windows 11 Home - Affinity Publisher, Photo & Designer, v2 (As I am a Windows user, any answers/comments I contribute may not apply to Mac or iPad.)
John Rostron Posted March 11, 2018 Author Posted March 11, 2018 54 minutes ago, PaulEC said: Sorry but this is just not correct. Flags come in all sorts of different shapes and sizes. Just Google "flags" and take a look! You are quite right. I was still remembering what I learned as a Scout sixty years ago. It was probably incorrect then! John Quote Windows 11, Affinity Photo 2.4.2 Designer 2.4.2 and Publisher 2.4.2 (mainly Photo). CPU: Intel Core i5 8500 @ 3.00GHz. RAM: 32.0GB DDR4 @ 1063MHz, Graphics: 2047MB NVIDIA GeForce GTX 1050
Richard S. Posted July 15, 2018 Posted July 15, 2018 Any chance someone could convert this macro to a macroS file, so that it can be used on Photo for iPad? Any help appreciated, as I don’t have my Mac available to convert it myself. Thank you. Quote High-End Photographic Prints
Alfred Posted July 15, 2018 Posted July 15, 2018 56 minutes ago, DesignMeister said: Any chance someone could convert this macro to a macroS file, so that it can be used on Photo for iPad? Library (*.macros) file duly attached. Flag-waving.afmacros Richard S. and John Rostron 1 1 Quote Alfred Affinity Designer/Photo/Publisher 2 for Windows • Windows 10 Home/Pro Affinity Designer/Photo/Publisher 2 for iPad • iPadOS 17.5.1 (iPad 7th gen)
Richard S. Posted July 15, 2018 Posted July 15, 2018 Alfred to the rescue once again. Thanks mate. Alfred 1 Quote High-End Photographic Prints
GryphonArt Posted August 16, 2023 Posted August 16, 2023 Thank you John Rostron, took me a while to find where to do this and made mine a little calmer in the wind.TeamTigsisle_Flag3B2_Flying2"B&W.pdfTeamTigsisle_Flag3B2_Flying2"B&W.pdfTeamTigsisle_Flag3B2_Flying2"B&W.pdf Quote
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