# Processing

**URL:** https://discourse.processing.org/c/processing/6.md?no_subcategories=false&page=46

[Latest](https://discourse.processing.org/latest.md) · [Categories](https://discourse.processing.org/categories.md) · [Tags](https://discourse.processing.org/tags.md)

**Page:** 47

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## [Use Vim commands in the Processing Development Environment (PDE)?](https://discourse.processing.org/t/use-vim-commands-in-the-processing-development-environment-pde/41000)

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**Author:** [@DougT](https://discourse.processing.org/u/DougT)\
**Replies:** 1\
**Last updated:** [February 22, 2023, 11:27pm UTC](https://discourse.processing.org/t/use-vim-commands-in-the-processing-development-environment-pde/41000 "2023-02-22T23:27:43Z")

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I would like to use vim commands (and perhaps syntax highlighting) in the PDE editor. I searched the documentation, but didn’t find much. If this is possible, please provide detailed instructions (or a reference). Tha…

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## [Logging strategies](https://discourse.processing.org/t/logging-strategies/39108)

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**Author:** [@renaudfv](https://discourse.processing.org/u/renaudfv)\
**Replies:** 2\
**Last updated:** [February 22, 2023, 3:10pm UTC](https://discourse.processing.org/t/logging-strategies/39108 "2023-02-22T15:10:58Z")

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Hi everyone! I was exploring logging strategies for projects that need to run all the time. It mainly comes out of a need to find if any errors are thrown by Processing/PApplet. Here’s a gist/snippet of what I came up …

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## [Binary Search algorithm](https://discourse.processing.org/t/binary-search-algorithm/40996)

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**Author:** [@neon124](https://discourse.processing.org/u/neon124)\
**Replies:** 1\
**Last updated:** [February 22, 2023, 2:30pm UTC](https://discourse.processing.org/t/binary-search-algorithm/40996 "2023-02-22T14:30:38Z")

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To find a record, I’m using binary search. My question is not about whether or not the data is present. My questions are listed here. if data are in following order 1 2 3 4 4 5 5 5 6 7 8 8 9 10 11 If I look for 5 whe…

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## [Function within mousePressed function doesn't work](https://discourse.processing.org/t/function-within-mousepressed-function-doesnt-work/40981)

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**Author:** [@MaxU89](https://discourse.processing.org/u/MaxU89)\
**Replies:** 3\
**Last updated:** [February 21, 2023, 8:55pm UTC](https://discourse.processing.org/t/function-within-mousepressed-function-doesnt-work/40981 "2023-02-21T20:55:50Z")

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Hello. I am still kind of new to processing. I have been trying to create a game with moving platform(I called it plank), balls which shoot down bricks. I am currently creating the platform and I want it to move on the x…

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## [Navigation links in PDF](https://discourse.processing.org/t/navigation-links-in-pdf/40973)

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**Author:** [@Mattax\_ger](https://discourse.processing.org/u/Mattax_ger)\
**Replies:** 3\
**Last updated:** [February 21, 2023, 5:06pm UTC](https://discourse.processing.org/t/navigation-links-in-pdf/40973 "2023-02-21T17:06:37Z")

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Hello everyone, i am using processing since 2015 and just registered for the forum. i would like to know if you guys can tell me how to put a page/chapter hypertext-link inside a generated pdf file, if this is even pos…

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## [Illegal modifier for the local class player; only abstract or final is permitted](https://discourse.processing.org/t/illegal-modifier-for-the-local-class-player-only-abstract-or-final-is-permitted/40970)

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**Author:** [@shoux2](https://discourse.processing.org/u/shoux2)\
**Replies:** 4\
**Last updated:** [February 21, 2023, 10:22am UTC](https://discourse.processing.org/t/illegal-modifier-for-the-local-class-player-only-abstract-or-final-is-permitted/40970 "2023-02-21T10:22:32Z")

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void player() { public class player { private int dx; private int dy; private int x = 40; private int y = 60; private int w; private int h; private Image image; public player() { …

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## [How do you import a class](https://discourse.processing.org/t/how-do-you-import-a-class/40971)

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**Author:** [@shoux2](https://discourse.processing.org/u/shoux2)\
**Replies:** 3\
**Last updated:** [February 21, 2023, 10:53am UTC](https://discourse.processing.org/t/how-do-you-import-a-class/40971 "2023-02-21T10:53:15Z")

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Main import java.awt.Image; import java.awt.event.KeyEvent; import javax.swing.ImageIcon; PImage gawd; PImage god; PImage lt33; void setup() { size(500, 500); background(50); scene1(); gawd = loadImage("gawd.p…

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## [Character ArrayList (with small Editor for one line of text)](https://discourse.processing.org/t/character-arraylist-with-small-editor-for-one-line-of-text/40967)

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**Author:** [@nanto2016](https://discourse.processing.org/u/nanto2016)\
**Replies:** 2\
**Last updated:** [February 20, 2023, 9:52pm UTC](https://discourse.processing.org/t/character-arraylist-with-small-editor-for-one-line-of-text/40967 "2023-02-20T21:52:07Z")

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I want to create an ArrayList of chars, how would I do this? ArrayList\<char\> a = new ArrayList\<char\>(); doesn’t work. Same for all primitive types, but int and some others have their own list datatypes. so I could use a…

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## [Random Select Images and Fade in / fade out according to variable / Blend](https://discourse.processing.org/t/random-select-images-and-fade-in-fade-out-according-to-variable-blend/40960)

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**Author:** [@JonnieNightTime](https://discourse.processing.org/u/JonnieNightTime)\
**Replies:** 1\
**Last updated:** [February 20, 2023, 9:12am UTC](https://discourse.processing.org/t/random-select-images-and-fade-in-fade-out-according-to-variable-blend/40960 "2023-02-20T09:12:21Z")

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Hi All, can’t see the wood for the trees here!! I"m trying to randomly move through an image directory, and fade in and out according to a variable imgA\_Duration. Eventually I want to blend multiple layers of images fro…

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## [New childs added to PShape after being displayed once won't show](https://discourse.processing.org/t/new-childs-added-to-pshape-after-being-displayed-once-wont-show/40963)

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**Author:** [@sem](https://discourse.processing.org/u/sem)\
**Replies:** 1\
**Last updated:** [February 19, 2023, 7:02pm UTC](https://discourse.processing.org/t/new-childs-added-to-pshape-after-being-displayed-once-wont-show/40963 "2023-02-19T19:02:45Z")

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Hello, in my sketch i continuesly add PShape childs to a group, but once i draw the group the newly added childs wont show up anymore, does anyone have a solution for this, or a workaround. I’d be very much appreciated. …

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## [Simplist way to have a high score server across multiple locations?](https://discourse.processing.org/t/simplist-way-to-have-a-high-score-server-across-multiple-locations/40957)

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**Author:** [@EliTheIceMan](https://discourse.processing.org/u/EliTheIceMan)\
**Replies:** 2\
**Last updated:** [February 19, 2023, 11:52am UTC](https://discourse.processing.org/t/simplist-way-to-have-a-high-score-server-across-multiple-locations/40957 "2023-02-19T11:52:43Z")

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I feel I am pretty competent with Processing (java) but have no experience with servers and the like. What would be the best/easiest way to implement a “server/broker” that could allow multiple instances of a sketch sim…

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## [Video library for Processing not found](https://discourse.processing.org/t/video-library-for-processing-not-found/40956)

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**Author:** [@Kylle](https://discourse.processing.org/u/Kylle)\
**Replies:** 2\
**Last updated:** [February 18, 2023, 1:20pm UTC](https://discourse.processing.org/t/video-library-for-processing-not-found/40956 "2023-02-18T13:20:15Z")

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I just tried the suggestion from Processing to get access to the webcam: However, the program does not recognize: import processing.video.\*; And I can not find the Library anywhere. Error message: The package proces…

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## [Changing Stroke and Fill of a PShape in realtime](https://discourse.processing.org/t/changing-stroke-and-fill-of-a-pshape-in-realtime/40944)

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**Author:** [@animalfrommars](https://discourse.processing.org/u/animalfrommars)\
**Replies:** 5\
**Last updated:** [February 16, 2023, 9:42pm UTC](https://discourse.processing.org/t/changing-stroke-and-fill-of-a-pshape-in-realtime/40944 "2023-02-16T21:42:28Z")

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Hello, Could any one explain me how to change the Stroke and the Fill of a PShape in realtime ? See the code below. Thank you very much for your help. PShape D; void setup() { size(400, 400, P3D); D = createShape…

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## [Create class in Processing (error message)](https://discourse.processing.org/t/create-class-in-processing-error-message/40922)

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**Author:** [@kmll](https://discourse.processing.org/u/kmll)\
**Replies:** 7\
**Last updated:** [February 16, 2023, 11:53am UTC](https://discourse.processing.org/t/create-class-in-processing-error-message/40922 "2023-02-16T11:53:47Z")

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I created a class in a separate TAB but I still get the “The class Test does not exist”. If I move the class code into the main tab it works fine. What do I need to do to import the class? In main tab: Test t1 = new Te…

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## [Why Processing still only supports float precision coordinates?](https://discourse.processing.org/t/why-processing-still-only-supports-float-precision-coordinates/40948)

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**Author:** [@istinn](https://discourse.processing.org/u/istinn)\
**Replies:** 2\
**Last updated:** [February 16, 2023, 12:44am UTC](https://discourse.processing.org/t/why-processing-still-only-supports-float-precision-coordinates/40948 "2023-02-16T00:44:22Z")

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Why processing still only supports float precision coordinates? Is there an obvious reason why not to support double data type alongside with float? If there was a reason back in the early days, this was hardware specs, …

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## [OpenCV facial expressions mapping](https://discourse.processing.org/t/opencv-facial-expressions-mapping/21133)

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**Author:** [@rkk16](https://discourse.processing.org/u/rkk16)\
**Replies:** 2\
**Last updated:** [February 15, 2023, 11:04pm UTC](https://discourse.processing.org/t/opencv-facial-expressions-mapping/21133 "2023-02-15T23:04:00Z")

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What would be the best way to detect facial expressions from a live video on processing and map the different expressions into values?

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## [Transitions for Fading and Zooming](https://discourse.processing.org/t/transitions-for-fading-and-zooming/40927)

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**Author:** [@ajaynischal1](https://discourse.processing.org/u/ajaynischal1)\
**Replies:** 1\
**Last updated:** [February 15, 2023, 5:57pm UTC](https://discourse.processing.org/t/transitions-for-fading-and-zooming/40927 "2023-02-15T17:57:54Z")

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ArrayList\<PImage\> images; int lastImageIndex = -1; int nextImageIndex = 0; float alphaValue = 0; float alphaShift = 0.004; // adjust speed, smaller = slower //Parabolic Zoom void setup() { fullScreen(P2…

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## [Library for Processing](https://discourse.processing.org/t/library-for-processing/40901)

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**Author:** [@OverLord](https://discourse.processing.org/u/OverLord)\
**Replies:** 4\
**Last updated:** [February 15, 2023, 5:08pm UTC](https://discourse.processing.org/t/library-for-processing/40901 "2023-02-15T17:08:44Z")

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Is it possible to create a library for Processing on Processing? If yes: What knowledge do I need to make a library for Processing.

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## [Why the exported to desktop (.exe) Processing app with Java classes can not work run properly?](https://discourse.processing.org/t/why-the-exported-to-desktop-exe-processing-app-with-java-classes-can-not-work-run-properly/40933)

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**Author:** [@MGDSStudio](https://discourse.processing.org/u/MGDSStudio)\
**Replies:** 2\
**Last updated:** [February 15, 2023, 3:22pm UTC](https://discourse.processing.org/t/why-the-exported-to-desktop-exe-processing-app-with-java-classes-can-not-work-run-properly/40933 "2023-02-15T15:22:50Z")

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I try to export my processing app as the “ready to use” application with exe launch file for desktop. My code is pretty simple. Proccessing code: private io.itch.mgdsstudio.airfight.connecteddevices.Controller controlle…

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## [How can I send a .wav file from a Processing client to a Python server?](https://discourse.processing.org/t/how-can-i-send-a-wav-file-from-a-processing-client-to-a-python-server/40913)

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**Author:** [@Alessandro199762](https://discourse.processing.org/u/Alessandro199762)\
**Replies:** 0\
**Last updated:** [February 13, 2023, 2:59pm UTC](https://discourse.processing.org/t/how-can-i-send-a-wav-file-from-a-processing-client-to-a-python-server/40913 "2023-02-13T14:59:45Z")

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Hello. As stated in the header, i need to send a file .wav (but i think any method is suitable for any file) from a processing client to a python server which processes the file and sends it back to the processing clien…

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## [Advice for understanding Processing 'under the hood'](https://discourse.processing.org/t/advice-for-understanding-processing-under-the-hood/40778)

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**Author:** [@MuddyGardener](https://discourse.processing.org/u/MuddyGardener)\
**Replies:** 11\
**Last updated:** [February 15, 2023, 1:33am UTC](https://discourse.processing.org/t/advice-for-understanding-processing-under-the-hood/40778 "2023-02-15T01:33:25Z")

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Sometimes I run into something about Processing that I think is super useful but isn’t obvious from the surface level documentation, such as this answer to a query from the old Processing forum: the PGraphics object us…

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## [Quiz with sounds and navigation bar (loading sounds)](https://discourse.processing.org/t/quiz-with-sounds-and-navigation-bar-loading-sounds/40923)

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**Author:** [@iinnessic](https://discourse.processing.org/u/iinnessic)\
**Replies:** 2\
**Last updated:** [February 14, 2023, 9:01pm UTC](https://discourse.processing.org/t/quiz-with-sounds-and-navigation-bar-loading-sounds/40923 "2023-02-14T21:01:23Z")

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Hi! So I have this Quiz about a solar cell I need to program. I have a few minor problems, but what really stresses me out right now, is that my code does not work when I import too many sounds… What can I do? These are…

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## [Problems downloading and running first time in Windows 11](https://discourse.processing.org/t/problems-downloading-and-running-first-time-in-windows-11/40915)

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**Author:** [@lmtanco](https://discourse.processing.org/u/lmtanco)\
**Replies:** 0\
**Last updated:** [February 13, 2023, 6:21pm UTC](https://discourse.processing.org/t/problems-downloading-and-running-first-time-in-windows-11/40915 "2023-02-13T18:21:02Z")

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Hi there, I upgraded my Windows 10 to Windows 11, then immediately installed Processing 4.3.1 for Windows. Windows 11 did not let me even download it (i had to turn off Antivirus). Once I managed to prevent Windows fr…

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## [Possible to use a variable as literal code? (from variables to ArrayList)](https://discourse.processing.org/t/possible-to-use-a-variable-as-literal-code-from-variables-to-arraylist/40903)

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**Author:** [@Aryszin](https://discourse.processing.org/u/Aryszin)\
**Replies:** 6\
**Last updated:** [February 12, 2023, 9:27pm UTC](https://discourse.processing.org/t/possible-to-use-a-variable-as-literal-code-from-variables-to-arraylist/40903 "2023-02-12T21:27:48Z")

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so this is very complicated. im making an art software and i have many pgraphics, and i need to speak to the pgraphics. im wondering if there is any method, i could make it so it doest always is: if(currentlayer == 1) {…

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## [Where do I get OpenGL filters?](https://discourse.processing.org/t/where-do-i-get-opengl-filters/40907)

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**Author:** [@Aryszin](https://discourse.processing.org/u/Aryszin)\
**Replies:** 1\
**Last updated:** [February 12, 2023, 9:20pm UTC](https://discourse.processing.org/t/where-do-i-get-opengl-filters/40907 "2023-02-12T21:20:01Z")

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Is there a site where i can download .glsl filter? Ty

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## [Saving Sketch to PDF Issues](https://discourse.processing.org/t/saving-sketch-to-pdf-issues/40909)

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**Author:** [@butterfield8](https://discourse.processing.org/u/butterfield8)\
**Replies:** 0\
**Last updated:** [February 12, 2023, 11:55pm UTC](https://discourse.processing.org/t/saving-sketch-to-pdf-issues/40909 "2023-02-12T23:55:41Z")

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Hello- I am trying to save my sketch to a pdf. When I follow the documentation exactly with a simple geometry, it works fine. However, I have a function that grabs a random shape and puts it on the screen in a loop. Whe…

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## [Catching image failure is not working (try/catch)](https://discourse.processing.org/t/catching-image-failure-is-not-working-try-catch/40890)

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**Author:** [@Aryszin](https://discourse.processing.org/u/Aryszin)\
**Replies:** 4\
**Last updated:** [February 11, 2023, 5:37pm UTC](https://discourse.processing.org/t/catching-image-failure-is-not-working-try-catch/40890 "2023-02-11T17:37:10Z")

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This doesnt work! void setup() { try { image = loadImage("image.png"); } catch (Exception e) { image = loadImage("error.png"); } }

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## [Can I change the layout of the IDE?](https://discourse.processing.org/t/can-i-change-the-layout-of-the-ide/40893)

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**Author:** [@eddysims](https://discourse.processing.org/u/eddysims)\
**Replies:** 1\
**Last updated:** [February 11, 2023, 9:04am UTC](https://discourse.processing.org/t/can-i-change-the-layout-of-the-ide/40893 "2023-02-11T09:04:30Z")

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I like the processing IDE, but i hate that my tabs are along the top. Is there any way to change the layout to have the tabs in a sidebar like a normal IDE?

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## [endDraw() error - M2 mac](https://discourse.processing.org/t/enddraw-error-m2-mac/40895)

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**Author:** [@mattleaf](https://discourse.processing.org/u/mattleaf)\
**Replies:** 1\
**Last updated:** [February 11, 2023, 3:33am UTC](https://discourse.processing.org/t/enddraw-error-m2-mac/40895 "2023-02-11T03:33:31Z")

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Howdy folks, it’s been a while since I’ve used Processing and now I’ve upgraded to an M2 Air. I was just testing an old project on an Intel MBP first where everything is fine, now coming across to the M2 Air I seem to h…

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## [How to do an array of IntLists?](https://discourse.processing.org/t/how-to-do-an-array-of-intlists/40894)

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**Author:** [@Rektic](https://discourse.processing.org/u/Rektic)\
**Replies:** 4\
**Last updated:** [February 10, 2023, 11:09pm UTC](https://discourse.processing.org/t/how-to-do-an-array-of-intlists/40894 "2023-02-10T23:09:13Z")

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There seems to be a way to make an array of IntLists (I know it sounds weird but I need it) but it throws an error. \</\> IntList test = new IntList\[5\]; void setup(){ test\[3\].append(8); println(test\[3\].get(0)); } \</\>…

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