# Latest **URL:** https://discourse.processing.org/latest.md?no_subcategories=false&page=390 [Latest](https://discourse.processing.org/latest.md) · [Categories](https://discourse.processing.org/categories.md) · [Tags](https://discourse.processing.org/tags.md) **Page:** 391 --- ## [Processing Community Day @ London 2020](https://discourse.processing.org/t/processing-community-day-london-2020/17980)

**Author:** [@limzykenneth](https://discourse.processing.org/u/limzykenneth)\ **Replies:** 0\ **Last updated:** [February 21, 2020, 6:27pm UTC](https://discourse.processing.org/t/processing-community-day-london-2020/17980 "2020-02-21T18:27:54Z")

Hi all, Just wanted to post here that PCD@London 2020 is being held at UAL Creative Computing Institute on 21st March alongside Arduino Day as Creative Computing Community Day (CCCD). You can sign up to attend here: ht… --- ## [How to make spikes](https://discourse.processing.org/t/how-to-make-spikes/17935)

**Author:** [@DMTR](https://discourse.processing.org/u/DMTR)\ **Replies:** 31\ **Last updated:** [February 21, 2020, 2:41pm UTC](https://discourse.processing.org/t/how-to-make-spikes/17935 "2020-02-21T14:41:25Z")

Hey, i am new user in processing and java. Im creating my first game, and i need help of making randomly spawning objects that kills you if you hit it. I want those objects spawn to right and going to left (player is i… --- ## [How to reference an object in another function to its class?](https://discourse.processing.org/t/how-to-reference-an-object-in-another-function-to-its-class/17964)

**Author:** [@anon94203042](https://discourse.processing.org/u/anon94203042)\ **Replies:** 3\ **Last updated:** [February 21, 2020, 1:32pm UTC](https://discourse.processing.org/t/how-to-reference-an-object-in-another-function-to-its-class/17964 "2020-02-21T13:32:51Z")

Let’s say that we have a class and a function (sorry for the peudo-code): class Person { int age; } Person squid; void IncreaseAge(Human object) { } How would I make it so that I could do something like this: v… --- ## [Beginner needs help](https://discourse.processing.org/t/beginner-needs-help/11589)

**Author:** [@d\_vibe](https://discourse.processing.org/u/d_vibe)\ **Replies:** 9\ **Last updated:** [February 21, 2020, 2:23am UTC](https://discourse.processing.org/t/beginner-needs-help/11589 "2020-02-21T02:23:50Z")

Hi! I’m fairly new to programming graphical effects, and I thought, as a starter, it would be a fun thing to try to imitate some of the early demoscene effects that was seen on computers, such as the Commodore Amiga, bac… --- ## [Help to improve sketch framerate, especially LiquidFun/PixelFlow components](https://discourse.processing.org/t/help-to-improve-sketch-framerate-especially-liquidfun-pixelflow-components/17682)

**Author:** [@julianpb.c1](https://discourse.processing.org/u/julianpb.c1)\ **Replies:** 3\ **Last updated:** [February 21, 2020, 12:23am UTC](https://discourse.processing.org/t/help-to-improve-sketch-framerate-especially-liquidfun-pixelflow-components/17682 "2020-02-21T00:23:11Z")

I’m creating a display for a research study that will run on a MS Surface tablet that has an Intel i5-4300U and embedded graphics. When I run my current sketch on the tablet, I max out around 12fps, CPU runs around 20%, … --- ## [Kinect interacting with LED's (processing & Arduino)](https://discourse.processing.org/t/kinect-interacting-with-leds-processing-arduino/10799)

**Author:** [@juriaan](https://discourse.processing.org/u/juriaan)\ **Replies:** 2\ **Last updated:** [February 20, 2020, 10:09pm UTC](https://discourse.processing.org/t/kinect-interacting-with-leds-processing-arduino/10799 "2020-02-20T22:09:27Z")

0 I use a neopixel 6x6 led matrix (ws2812) + Arduino Uno I wrote a small code that uses Kinect to track movement in processing. It displays everything between the depth of 300 & 500 in pixels. I want this to be displa… --- ## [Reversing Random Distribution](https://discourse.processing.org/t/reversing-random-distribution/17427)

**Author:** [@PhilRandom](https://discourse.processing.org/u/PhilRandom)\ **Replies:** 2\ **Last updated:** [February 20, 2020, 7:20pm UTC](https://discourse.processing.org/t/reversing-random-distribution/17427 "2020-02-20T19:20:04Z")

Hello Fellow Coders, Phil Again, It seems that I have run into another coding predicament…oops. I have successfully coded a random distribution descending code that changes color when reaching the bottom of the canvas… --- ## [Lat long to screen coordinates from database](https://discourse.processing.org/t/lat-long-to-screen-coordinates-from-database/17434)

**Author:** [@katniss0809](https://discourse.processing.org/u/katniss0809)\ **Replies:** 1\ **Last updated:** [February 20, 2020, 6:56pm UTC](https://discourse.processing.org/t/lat-long-to-screen-coordinates-from-database/17434 "2020-02-20T18:56:41Z")

I have a set of coordinates (more than 100 points) from a JDBC connection and I want to display them on Processing canvas. However, the coordinates are in latitude and longitude, e.g (42.3541, -72.1675), how can I transf… --- ## [Smartwatch, Compass value does not change](https://discourse.processing.org/t/smartwatch-compass-value-does-not-change/17640)

**Author:** [@anon68884268](https://discourse.processing.org/u/anon68884268)\ **Replies:** 3\ **Last updated:** [February 20, 2020, 6:16pm UTC](https://discourse.processing.org/t/smartwatch-compass-value-does-not-change/17640 "2020-02-20T18:16:14Z")

Hello, I’ve written a little smartwatch watchface (with the Ketai Libary), and the compass value isn’t changing. I tried it with getting the Sensor manually, but then it said me, The field Sensor.TYPE\_ORIENTATION is dep… --- ## [Shape (two parameters)](https://discourse.processing.org/t/shape-two-parameters/17465)

**Author:** [@paulstgeorge](https://discourse.processing.org/u/paulstgeorge)\ **Replies:** 1\ **Last updated:** [February 19, 2020, 4:51am UTC](https://discourse.processing.org/t/shape-two-parameters/17465 "2020-02-19T04:51:50Z")

I am trying to understand shape() and its two parameters. In this simple example below I have used createShape() to make two spheres. Spheres, in my world, are three-dimensional. All is fine until I get to position the s… --- ## ["If doc == null" not is correct](https://discourse.processing.org/t/if-doc-null-not-is-correct/17941)

**Author:** [@NoName](https://discourse.processing.org/u/NoName)\ **Replies:** 9\ **Last updated:** [February 20, 2020, 2:07pm UTC](https://discourse.processing.org/t/if-doc-null-not-is-correct/17941 "2020-02-20T14:07:53Z")

Guys, I tried to solve this problem myself, but I couldn’t. I have the docMain \[0\] line, which I take from the file on the phone, but even if it is null (checked), then the if check considers it not null anyway . how … --- ## [The count of files in the sketch folder?](https://discourse.processing.org/t/the-count-of-files-in-the-sketch-folder/17931)

**Author:** [@iamjustcurious](https://discourse.processing.org/u/iamjustcurious)\ **Replies:** 4\ **Last updated:** [February 20, 2020, 9:30am UTC](https://discourse.processing.org/t/the-count-of-files-in-the-sketch-folder/17931 "2020-02-20T09:30:58Z")

How can I get the number of files in the sketch folder? Second Question Is it possible to get the number of files in the desktop? Thanks. --- ## [Why can't use mouseX in pixels processing](https://discourse.processing.org/t/why-cant-use-mousex-in-pixels-processing/17926)

**Author:** [@fang1](https://discourse.processing.org/u/fang1)\ **Replies:** 2\ **Last updated:** [February 20, 2020, 2:39am UTC](https://discourse.processing.org/t/why-cant-use-mousex-in-pixels-processing/17926 "2020-02-20T02:39:07Z")

hello,guys! I’m sorry to borther you a little time about the problem I meeting in using mouseX,mouseY in loops of pixels location array.I find a code linkin this situation can run,but it doesn’t work on my processing sof… --- ## [Uber KML Icosahedron](https://discourse.processing.org/t/uber-kml-icosahedron/17601)

**Author:** [@HackinHarry](https://discourse.processing.org/u/HackinHarry)\ **Replies:** 2\ **Last updated:** [February 20, 2020, 1:02am UTC](https://discourse.processing.org/t/uber-kml-icosahedron/17601 "2020-02-20T01:02:05Z")

Somehow I ended up reading Uber’s articles on H3, a library they wrote to divide up their markets into hexagons. They have a github page : \[https://github.com/uber/h3/blob/master/KML/icosa.kml#L204\] that uses kml to d… --- ## [What are the advantages of using predefined functions over keywords?](https://discourse.processing.org/t/what-are-the-advantages-of-using-predefined-functions-over-keywords/17897)

**Author:** [@anon94203042](https://discourse.processing.org/u/anon94203042)\ **Replies:** 6\ **Last updated:** [February 19, 2020, 10:56pm UTC](https://discourse.processing.org/t/what-are-the-advantages-of-using-predefined-functions-over-keywords/17897 "2020-02-19T22:56:46Z")

Are there any benefits to using void keyPressed() {} instead of if (keyPressed)? Or void mousePressed() {} instead of if (mousePressed). Or something like that. And in which situations would you use one over the other? --- ## [Web loadStrings](https://discourse.processing.org/t/web-loadstrings/17923)

**Author:** [@juanjoc](https://discourse.processing.org/u/juanjoc)\ **Replies:** 2\ **Last updated:** [February 19, 2020, 11:59am UTC](https://discourse.processing.org/t/web-loadstrings/17923 "2020-02-19T11:59:46Z")

Hi guys Im working with data extraction of the web. I tried to use examples like the following String\[\] rawhtml; String \[\] shows; String html; int j = 0; void setup(){ rawhtml = loadStrings("\ **Author:** [@Alesk1969](https://discourse.processing.org/u/Alesk1969)\ **Replies:** 3\ **Last updated:** [February 19, 2020, 8:21pm UTC](https://discourse.processing.org/t/error-on-startup/17863 "2020-02-19T20:21:11Z") Hi, I just installed Processing on my PI 3B+ by running the instruction : “curl https://processing.org/download/install-arm.sh | sudo sh” in the terminal. The installation went OK, I made a reboot, but when I’m trying t… --- ## [Time synched animation](https://discourse.processing.org/t/time-synched-animation/17685)

**Author:** [@BrokenCode](https://discourse.processing.org/u/BrokenCode)\ **Replies:** 15\ **Last updated:** [February 19, 2020, 6:45pm UTC](https://discourse.processing.org/t/time-synched-animation/17685 "2020-02-19T18:45:53Z")

Hello everyone, here I’m trying to divide the screen with a grid, then fill each tile in a pre-determined amount of time: (this is the most simplified - even silly - example) float timeToConsume = 7, timeToCancelBin; in… --- ## [Variable must change from 3.67 to 3.15](https://discourse.processing.org/t/variable-must-change-from-3-67-to-3-15/17929)

**Author:** [@JochemTD](https://discourse.processing.org/u/JochemTD)\ **Replies:** 3\ **Last updated:** [February 19, 2020, 6:14pm UTC](https://discourse.processing.org/t/variable-must-change-from-3-67-to-3-15/17929 "2020-02-19T18:14:08Z")

Hi there! I need my variable i to go from 3.67 to 3.15 to 3.67 to 3.15 to 3.67 and so on. I’m able to do this just fine from 3.67 to 3.15, however I can’t manage to let it go back to 3.67. This is the code i’m using rig… --- ## [Processing project started in CMD - error handling](https://discourse.processing.org/t/processing-project-started-in-cmd-error-handling/17930)

**Author:** [@GeorgeJava](https://discourse.processing.org/u/GeorgeJava)\ **Replies:** 6\ **Last updated:** [February 19, 2020, 2:55pm UTC](https://discourse.processing.org/t/processing-project-started-in-cmd-error-handling/17930 "2020-02-19T14:55:09Z")

I just start bat file, and want to open some my .pde project, and run it… It works, but… When i have some syntax error in the code, it will only close cmd… I want to get the error, where is it ? What is it ? What is … --- ## [Creating a structure of linked tetrahedra](https://discourse.processing.org/t/creating-a-structure-of-linked-tetrahedra/16955)

**Author:** [@dauwpunt](https://discourse.processing.org/u/dauwpunt)\ **Replies:** 13\ **Last updated:** [February 19, 2020, 1:41pm UTC](https://discourse.processing.org/t/creating-a-structure-of-linked-tetrahedra/16955 "2020-02-19T13:41:12Z")

Hi there. I am trying to generate a 3D landscape of tetrahedra, so to say, and I’m having some trouble with the mathematics and coding of it. I’m also still quite new to Processing! If I am not being clear enough about s… --- ## [The slider of cp5 library is not responsive](https://discourse.processing.org/t/the-slider-of-cp5-library-is-not-responsive/17856)

**Author:** [@Kamel](https://discourse.processing.org/u/Kamel)\ **Replies:** 3\ **Last updated:** [February 19, 2020, 6:53am UTC](https://discourse.processing.org/t/the-slider-of-cp5-library-is-not-responsive/17856 "2020-02-19T06:53:06Z")

hello everyone i am using cp5 library to get and represent json data “sensors values” from arduino and from the processing program i want to send to parameters to arduino “percentage and frequency”, i am using two slide… --- ## [Utilisation manette en processing](https://discourse.processing.org/t/utilisation-manette-en-processing/17481)

**Author:** [@theclimbhacker](https://discourse.processing.org/u/theclimbhacker)\ **Replies:** 4\ **Last updated:** [February 19, 2020, 6:06am UTC](https://discourse.processing.org/t/utilisation-manette-en-processing/17481 "2020-02-19T06:06:30Z")