# Processing

**URL:** https://discourse.processing.org/c/processing/6.md?no_subcategories=false&page=274

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

**Page:** 275

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## [Circle fractal not showing largest starting circles](https://discourse.processing.org/t/circle-fractal-not-showing-largest-starting-circles/13787)

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**Author:** [@c0d3d](https://discourse.processing.org/u/c0d3d)\
**Replies:** 3\
**Last updated:** [September 4, 2019, 5:29am UTC](https://discourse.processing.org/t/circle-fractal-not-showing-largest-starting-circles/13787 "2019-09-04T05:29:49Z")

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Hello, I am currently trying to make a simple circle fractal. I for some reason am not getting the largest circles/the starting ones. Here is my code: void setup() { size(640,360); } void draw() { background(255); …

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## [Control Brightness Via Artnet and DMX](https://discourse.processing.org/t/control-brightness-via-artnet-and-dmx/13779)

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**Author:** [@makerinchief](https://discourse.processing.org/u/makerinchief)\
**Replies:** 2\
**Last updated:** [September 3, 2019, 10:55pm UTC](https://discourse.processing.org/t/control-brightness-via-artnet-and-dmx/13779 "2019-09-03T22:55:58Z")

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I’m controlling a bunch of RGB led strips using Artnet protocol and some DMX decoders like the one in this link: I’m able to control the colors just fine but I want to control the brightness of certain RGB strips. I …

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## [Left hand side of the argument](https://discourse.processing.org/t/left-hand-side-of-the-argument/13771)

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**Author:** [@paulgoux](https://discourse.processing.org/u/paulgoux)\
**Replies:** 1\
**Last updated:** [September 3, 2019, 2:58am UTC](https://discourse.processing.org/t/left-hand-side-of-the-argument/13771 "2019-09-03T02:58:03Z")

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Converting code from P5.js. In the original code I had an array which can be flexible in p5 which I used to store the location of the Objects I’m working with, and In my function I would call the location in the array an…

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## [Possible at all? Create path on image, generate cutting boxes, separate each box](https://discourse.processing.org/t/possible-at-all-create-path-on-image-generate-cutting-boxes-separate-each-box/13756)

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**Author:** [@damomp](https://discourse.processing.org/u/damomp)\
**Replies:** 10\
**Last updated:** [September 3, 2019, 12:04am UTC](https://discourse.processing.org/t/possible-at-all-create-path-on-image-generate-cutting-boxes-separate-each-box/13756 "2019-09-03T00:04:35Z")

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Dear all, just getting started with processing and wondering if this is possible within processing? I haven’t succeeded doing this in photoshop. I need to dissolve an image into smaller party while each part should be…

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## [can I separate SVG rendering stroke width from shape size? (line fonts for plotting)](https://discourse.processing.org/t/can-i-separate-svg-rendering-stroke-width-from-shape-size-line-fonts-for-plotting/13359)

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**Author:** [@arcadeperfect](https://discourse.processing.org/u/arcadeperfect)\
**Replies:** 7\
**Last updated:** [September 2, 2019, 6:11pm UTC](https://discourse.processing.org/t/can-i-separate-svg-rendering-stroke-width-from-shape-size-line-fonts-for-plotting/13359 "2019-09-02T18:11:02Z")

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Hi, Rendering an SVG. Have disabled the SVG’s style. My problem is that even though I’m setting the stroke weight through processing, it still scales that stroke when I render the SVG at different sizes. What I want is…

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## [Simplex noise octaves](https://discourse.processing.org/t/simplex-noise-octaves/13762)

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**Author:** [@arcadeperfect](https://discourse.processing.org/u/arcadeperfect)\
**Replies:** 1\
**Last updated:** [September 2, 2019, 7:01pm UTC](https://discourse.processing.org/t/simplex-noise-octaves/13762 "2019-09-02T19:01:25Z")

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Hello! Is there a way to adjust the octaves and force the seed with toxi.math.simplexnoise? I found these docs but can’t find it. Alternatively are there any other noise algorithms available? The problem I have with t…

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## [Request for SVG Gradient file](https://discourse.processing.org/t/request-for-svg-gradient-file/12116)

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**Author:** [@clankill3r](https://discourse.processing.org/u/clankill3r)\
**Replies:** 4\
**Last updated:** [September 2, 2019, 6:02pm UTC](https://discourse.processing.org/t/request-for-svg-gradient-file/12116 "2019-09-02T18:02:55Z")

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Could someone provide me a svg with a gradient that works in processing? I wan’t to see if I can make processing support svg gradients from svg’s exported from affinity designer, but it would be really helpfull to have …

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## [Classes initialising other classes](https://discourse.processing.org/t/classes-initialising-other-classes/13768)

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**Author:** [@arcadeperfect](https://discourse.processing.org/u/arcadeperfect)\
**Replies:** 2\
**Last updated:** [September 2, 2019, 4:51pm UTC](https://discourse.processing.org/t/classes-initialising-other-classes/13768 "2019-09-02T16:51:14Z")

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Hello! This is more a Java question than processing but I’m hoping the processing folks will be more merciful that stack overflow :slight\_smile: I am trying to translate this gravity simulator from python to processing. …

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## [Is it possible higher precision than double?](https://discourse.processing.org/t/is-it-possible-higher-precision-than-double/13764)

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**Author:** [@AngelRF](https://discourse.processing.org/u/AngelRF)\
**Replies:** 4\
**Last updated:** [September 2, 2019, 2:40pm UTC](https://discourse.processing.org/t/is-it-possible-higher-precision-than-double/13764 "2019-09-02T14:40:40Z")

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I’m doing a Numeric Differentiation calculating program, and the second and third derivative get waay too noisy, according to wikipedia, this is caused by floating-point arithmetic rounding. https://en.wikipedia.org/wiki…

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## [Wake up Windows and the draw frame dies a horrible death](https://discourse.processing.org/t/wake-up-windows-and-the-draw-frame-dies-a-horrible-death/13753)

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**Author:** [@wakewatcher](https://discourse.processing.org/u/wakewatcher)\
**Replies:** 4\
**Last updated:** [September 2, 2019, 2:30pm UTC](https://discourse.processing.org/t/wake-up-windows-and-the-draw-frame-dies-a-horrible-death/13753 "2019-09-02T14:30:48Z")

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I’ve been having problems with my Processing sketch crashing. The IDE remains if its running via the IDE but draw window(s) disappear. If running as an exe crashes as well. I thought (still might be) some coding problem…

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## [Help on code (drawing circle mathematically)](https://discourse.processing.org/t/help-on-code-drawing-circle-mathematically/13759)

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**Author:** [@sbiju72](https://discourse.processing.org/u/sbiju72)\
**Replies:** 3\
**Last updated:** [September 2, 2019, 2:06pm UTC](https://discourse.processing.org/t/help-on-code-drawing-circle-mathematically/13759 "2019-09-02T14:06:09Z")

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Hi I’m failing to see why the default circle and the circle mathematically drawn doesn’t match. Any help is appreciated. Code below: size(400,400); int cx = 200, cy = 200, cr = 100, xdis, ydis; stroke(255,0,0); circl…

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## [Sending multiple numbers to Arduino via Serial](https://discourse.processing.org/t/sending-multiple-numbers-to-arduino-via-serial/13751)

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**Author:** [@zara2355](https://discourse.processing.org/u/zara2355)\
**Replies:** 3\
**Last updated:** [September 1, 2019, 11:13pm UTC](https://discourse.processing.org/t/sending-multiple-numbers-to-arduino-via-serial/13751 "2019-09-01T23:13:50Z")

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Hello, For the project i am doing, i am trying to grab weather data from multiple cities that i will then use to drive some NeoPixles on an Arduino with. The Processing sketch i have at the moment uses 3 cities, and tak…

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## [Shader as texture for primitive](https://discourse.processing.org/t/shader-as-texture-for-primitive/13680)

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**Author:** [@lnp](https://discourse.processing.org/u/lnp)\
**Replies:** 13\
**Last updated:** [August 29, 2019, 9:18pm UTC](https://discourse.processing.org/t/shader-as-texture-for-primitive/13680 "2019-08-29T21:18:26Z")

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Is it possible to use a shader as a texture on a 3d primitive? When I invoke shader the effect is to render the sphere as a flat 2d object with the shader as a fill rather than a texture. I thought I could call texture(…

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## [Processing 3 keeps throwing an error, when I try to run any Java code!](https://discourse.processing.org/t/processing-3-keeps-throwing-an-error-when-i-try-to-run-any-java-code/13739)

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**Author:** [@BitLlama](https://discourse.processing.org/u/BitLlama)\
**Replies:** 5\
**Last updated:** [September 1, 2019, 10:41am UTC](https://discourse.processing.org/t/processing-3-keeps-throwing-an-error-when-i-try-to-run-any-java-code/13739 "2019-09-01T10:41:01Z")

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Exception in thread “Thread-25” java.lang.RuntimeException: Exception while attempting /usr/lib/jvm/java-8-openjdk/bin/java -agentlib:jdwp=transport=dt\_socket,address=8357,server=y,suspend=y,quiet=y -Djna.nosys=true -Dj…

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## [Size of Pop-Ups on UHD Screen](https://discourse.processing.org/t/size-of-pop-ups-on-uhd-screen/13733)

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**Author:** [@jjo](https://discourse.processing.org/u/jjo)\
**Replies:** 0\
**Last updated:** [August 31, 2019, 10:33pm UTC](https://discourse.processing.org/t/size-of-pop-ups-on-uhd-screen/13733 "2019-08-31T22:33:52Z")

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I have a Dell XPS 15 with a UHD display and Processing 3.5.3. Pop-up windows are very small. Does anyone have a solution to this problem? I am a new user, so I can only supply one picture below. The problem happens a…

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## [PShape texture only applies colour not text?](https://discourse.processing.org/t/pshape-texture-only-applies-colour-not-text/13596)

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**Author:** [@michthom](https://discourse.processing.org/u/michthom)\
**Replies:** 12\
**Last updated:** [August 31, 2019, 7:52pm UTC](https://discourse.processing.org/t/pshape-texture-only-applies-colour-not-text/13596 "2019-08-31T19:52:12Z")

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Hi folks I’m trying to create a PShape - a rounded rectangle, with a texture consisting of a background colour and some text overlaid. There may be simpler ways, but this is for a project where I’ll be displaying hundre…

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## [How do I switch between fullscreen and windowed during the sketch](https://discourse.processing.org/t/how-do-i-switch-between-fullscreen-and-windowed-during-the-sketch/13726)

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**Author:** [@Lachieblue](https://discourse.processing.org/u/Lachieblue)\
**Replies:** 1\
**Last updated:** [August 31, 2019, 6:41pm UTC](https://discourse.processing.org/t/how-do-i-switch-between-fullscreen-and-windowed-during-the-sketch/13726 "2019-08-31T18:41:33Z")

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So as the title says, I want to create a button or something that I can click during a sketch to resize the window from fullscreen to different windowed resolutions like in a game. I’ve experimented with surface.setSize…

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## [Getting really bad lag with a function](https://discourse.processing.org/t/getting-really-bad-lag-with-a-function/13725)

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**Author:** [@lax](https://discourse.processing.org/u/lax)\
**Replies:** 4\
**Last updated:** [August 31, 2019, 6:24pm UTC](https://discourse.processing.org/t/getting-really-bad-lag-with-a-function/13725 "2019-08-31T18:24:33Z")

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Hi, I have this function which i run on every pixel, which causes the fps to drop to around 1 fps: PVector kaleido(PVector uv) { float th = atan2(uv.y, uv.x); float r = uv.magSq(); th = sin(th \* 6.283f / 0.8975979…

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## [Adding an external java Library](https://discourse.processing.org/t/adding-an-external-java-library/1594)

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**Author:** [@DogeMastr](https://discourse.processing.org/u/DogeMastr)\
**Replies:** 4\
**Last updated:** [August 31, 2019, 2:13pm UTC](https://discourse.processing.org/t/adding-an-external-java-library/1594 "2019-08-31T14:13:23Z")

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Im trying to import the library mp3agic and ive gotten to the point where ive used maven to build the .jar file and i have it in the librarys folder like this: Documents/Processing/Librarys/mp3agic/library When I used …

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## [Help me understand this cool/short code on OpenProcessing](https://discourse.processing.org/t/help-me-understand-this-cool-short-code-on-openprocessing/13721)

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**Author:** [@sorenkirk](https://discourse.processing.org/u/sorenkirk)\
**Replies:** 0\
**Last updated:** [August 31, 2019, 1:12pm UTC](https://discourse.processing.org/t/help-me-understand-this-cool-short-code-on-openprocessing/13721 "2019-08-31T13:12:35Z")

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I found the following code on Open Processing. https://www.openprocessing.org/sketch/374455 Would somebody help me understand the Particle class? In particular, what is the math going on in the update function? class …

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## [How to find number of displays](https://discourse.processing.org/t/how-to-find-number-of-displays/13037)

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**Author:** [@jtk](https://discourse.processing.org/u/jtk)\
**Replies:** 3\
**Last updated:** [August 31, 2019, 11:35am UTC](https://discourse.processing.org/t/how-to-find-number-of-displays/13037 "2019-08-31T11:35:28Z")

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Is there a way to find out how many displays are available to my Processing program? I would like my sketch to start in fullScreen on display 2 if it is connected, otherwise display 1. Currently, I’m using fullScreen(2…

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## [Error with OR in MacBook](https://discourse.processing.org/t/error-with-or-in-macbook/13717)

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**Author:** [@Angie](https://discourse.processing.org/u/Angie)\
**Replies:** 2\
**Last updated:** [August 31, 2019, 10:03am UTC](https://discourse.processing.org/t/error-with-or-in-macbook/13717 "2019-08-31T10:03:11Z")

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Good morning, I’m beginning using Processing and I’ve problems writing down the OR simbol. Processing gives my ERROR when I write it in my MacBook. I’m using || (alt + 1) but also I’ve tried to copy+paste directly of a …

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## [Trouble with the bouncing ball example from the NoC book](https://discourse.processing.org/t/trouble-with-the-bouncing-ball-example-from-the-noc-book/13705)

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**Author:** [@cyml](https://discourse.processing.org/u/cyml)\
**Replies:** 8\
**Last updated:** [August 31, 2019, 9:50am UTC](https://discourse.processing.org/t/trouble-with-the-bouncing-ball-example-from-the-noc-book/13705 "2019-08-31T09:50:30Z")

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on my first embark of the first example in The Nature of Code, Processing is telling me Missing right parenthesis “)” and I compared my code to Daniel’s sample code… and I couldn’t figure out why. Can someone help me…

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## [Learning curve in Generative Art](https://discourse.processing.org/t/learning-curve-in-generative-art/13612)

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**Author:** [@Marinus](https://discourse.processing.org/u/Marinus)\
**Replies:** 12\
**Last updated:** [August 31, 2019, 9:10am UTC](https://discourse.processing.org/t/learning-curve-in-generative-art/13612 "2019-08-31T09:10:26Z")

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Hi all, first post here. A little background info: One week ago I started to learn how to code in Processing. I’m not familiar with creating code, only with altering work of others. I’ve worked in python, java, javascri…

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## [Size() cannot be used here issue. Please Help!](https://discourse.processing.org/t/size-cannot-be-used-here-issue-please-help/13696)

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**Author:** [@Kaiskana](https://discourse.processing.org/u/Kaiskana)\
**Replies:** 5\
**Last updated:** [August 31, 2019, 4:53am UTC](https://discourse.processing.org/t/size-cannot-be-used-here-issue-please-help/13696 "2019-08-31T04:53:15Z")

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Hello, I am currently trying to make some artwork for my media class. My professor is having us make the size with a width 1280px, and a height 720px. When starting to write the code that I would be using, I got an error…

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## [Noise edge detection](https://discourse.processing.org/t/noise-edge-detection/13367)

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**Author:** [@TimoL](https://discourse.processing.org/u/TimoL)\
**Replies:** 4\
**Last updated:** [August 30, 2019, 6:09pm UTC](https://discourse.processing.org/t/noise-edge-detection/13367 "2019-08-30T18:09:12Z")

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Hi all! Im struggling to put into words what I need help with. Im not sure how best to use noise to effect a grid of shapes. I’ve included my code which should help clarify… Basically I have a grid of rectangles and …

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## [How to change the canvas size of kinect?](https://discourse.processing.org/t/how-to-change-the-canvas-size-of-kinect/13701)

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**Author:** [@AbleYudada](https://discourse.processing.org/u/AbleYudada)\
**Replies:** 1\
**Last updated:** [August 30, 2019, 10:08am UTC](https://discourse.processing.org/t/how-to-change-the-canvas-size-of-kinect/13701 "2019-08-30T10:08:16Z")

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I am playing with the Kinect and when I enlarge the size of the canvas, the Kinect window stays the same size and does not expand to match the size of the canvas. How can I enlarge it?

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## [\[Solved\] Drawing lots of circles](https://discourse.processing.org/t/solved-drawing-lots-of-circles/13697)

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**Author:** [@nicnut](https://discourse.processing.org/u/nicnut)\
**Replies:** 3\
**Last updated:** [August 30, 2019, 6:56am UTC](https://discourse.processing.org/t/solved-drawing-lots-of-circles/13697 "2019-08-30T06:56:05Z")

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Hi, I am new to Processing and still have lots to learn and there is a ton I don’t understand. I watched the Youtube Coding Train video on For Loops and While Loops. In the video he uses a while loop to draw lot’s of l…

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## [Need help finding whats causing a NullPointerException](https://discourse.processing.org/t/need-help-finding-whats-causing-a-nullpointerexception/13694)

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**Author:** [@Kasdriu](https://discourse.processing.org/u/Kasdriu)\
**Replies:** 1\
**Last updated:** [August 29, 2019, 10:23pm UTC](https://discourse.processing.org/t/need-help-finding-whats-causing-a-nullpointerexception/13694 "2019-08-29T22:23:24Z")

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Hi, Ive been trying to send a string value from Arduino to Processing but I keep getting a NullPointerException when it gets to this line if (val.equals("hola")) { //file.play(); println("Funciona"); } I kn…

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## [Processing-java error](https://discourse.processing.org/t/processing-java-error/1786)

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**Author:** [@cameyo](https://discourse.processing.org/u/cameyo)\
**Replies:** 11\
**Last updated:** [August 29, 2019, 8:05pm UTC](https://discourse.processing.org/t/processing-java-error/1786 "2019-08-29T20:05:24Z")

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I got the following error when running this processing-java command: processing-java --sketch="C://PDE3/max/button" --output="C://PDE3/max/button/output" --force --run Exception in thread “main” java.lang.NoClassDefFo…

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