# Processing

**URL:** https://discourse.processing.org/c/processing/6.md?page=150

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**Page:** 151

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## [Infinite, random, non-repeating 2d terrain generation](https://discourse.processing.org/t/infinite-random-non-repeating-2d-terrain-generation/27716)

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**Author:** [@spaces](https://discourse.processing.org/u/spaces)\
**Replies:** 5\
**Last updated:** [February 13, 2021, 12:50pm UTC](https://discourse.processing.org/t/infinite-random-non-repeating-2d-terrain-generation/27716 "2021-02-13T12:50:46Z")

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Dear programmers, I’m new to the Forum and not new to Processing Java mode. I’ve been searching on the Internet for days to find an algorithm that is able to generate 2d terrain endlessly, and randomly but also natural…

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## [Extracting current date and time](https://discourse.processing.org/t/extracting-current-date-and-time/27754)

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**Author:** [@proc8888](https://discourse.processing.org/u/proc8888)\
**Replies:** 3\
**Last updated:** [February 13, 2021, 12:42pm UTC](https://discourse.processing.org/t/extracting-current-date-and-time/27754 "2021-02-13T12:42:34Z")

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How do I extract current date and current time? The ‘Time & Date’ functions in Processing org reference (online) has individual fields for year, month, day, hour etc. Instead, I would like to extract the whole current …

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## [Need help to solve (skyscraper)](https://discourse.processing.org/t/need-help-to-solve-skyscraper/27685)

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**Author:** [@Sett](https://discourse.processing.org/u/Sett)\
**Replies:** 26\
**Last updated:** [February 13, 2021, 8:00am UTC](https://discourse.processing.org/t/need-help-to-solve-skyscraper/27685 "2021-02-13T08:00:05Z")

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please format code with \</\> button \* homework policy \* asking questions String storey = " “; String tokens=split(storey,”,"); int level ={0,1,2,3,4,5,6,7,8,9,10}; int j = 0; void setup() { size(1000,1000); back…

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## [How can i show only a certain number of members of an Array?](https://discourse.processing.org/t/how-can-i-show-only-a-certain-number-of-members-of-an-array/27727)

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**Author:** [@nicnut](https://discourse.processing.org/u/nicnut)\
**Replies:** 7\
**Last updated:** [February 13, 2021, 2:01am UTC](https://discourse.processing.org/t/how-can-i-show-only-a-certain-number-of-members-of-an-array/27727 "2021-02-13T02:01:04Z")

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Hi, I have always been bad with Arrays, maybe someone can help me out. I am trying to create an interactive Processing sketch, where I send OSC messages into Processing, which I have worked out. I took one of the exam…

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## [Finding problem with A\* algorithm](https://discourse.processing.org/t/finding-problem-with-a-algorithm/27773)

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**Author:** [@jensemand](https://discourse.processing.org/u/jensemand)\
**Replies:** 0\
**Last updated:** [February 12, 2021, 8:50pm UTC](https://discourse.processing.org/t/finding-problem-with-a-algorithm/27773 "2021-02-12T20:50:19Z")

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Hi I am trying to to make a pathfinding system with the A\* algorithm and I have tried to make my own but that didn’t seem to work so I tried to make the one from the coding challenge by The coding train. I am close to ma…

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## [What java libaries are default in processing?](https://discourse.processing.org/t/what-java-libaries-are-default-in-processing/27737)

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**Author:** [@CodeMasterX](https://discourse.processing.org/u/CodeMasterX)\
**Replies:** 3\
**Last updated:** [February 12, 2021, 7:13pm UTC](https://discourse.processing.org/t/what-java-libaries-are-default-in-processing/27737 "2021-02-12T19:13:14Z")

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Hi! I recently started looking into java libraries. I tried a few libraries and saw that the java.event.KeyListener looks and works exactly like void keyPressed() keyReleased() keyTyped() Which other libraries are in …

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## [Scalable chart graphics](https://discourse.processing.org/t/scalable-chart-graphics/27763)

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**Author:** [@xbix](https://discourse.processing.org/u/xbix)\
**Replies:** 4\
**Last updated:** [February 12, 2021, 5:21pm UTC](https://discourse.processing.org/t/scalable-chart-graphics/27763 "2021-02-12T17:21:35Z")

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I want to create good scalable chart graphics, are there any good tutorials about this topic? Or maybe someone would like to share his ideas about this topic? Thanks a lot!

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## [How do I calculate the width of a string in pixels?](https://discourse.processing.org/t/how-do-i-calculate-the-width-of-a-string-in-pixels/27762)

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**Author:** [@xbix](https://discourse.processing.org/u/xbix)\
**Replies:** 1\
**Last updated:** [February 12, 2021, 4:14pm UTC](https://discourse.processing.org/t/how-do-i-calculate-the-width-of-a-string-in-pixels/27762 "2021-02-12T16:14:44Z")

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How to calculate the width of a String in pixels in Processing? For e.g., I have a string that says “Processing”. What is its length in pixels, also considering its font family and size? Thanks in advance!

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## [G4P - Click on panel disables button](https://discourse.processing.org/t/g4p-click-on-panel-disables-button/27730)

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**Author:** [@blerk](https://discourse.processing.org/u/blerk)\
**Replies:** 5\
**Last updated:** [February 12, 2021, 12:12pm UTC](https://discourse.processing.org/t/g4p-click-on-panel-disables-button/27730 "2021-02-12T12:12:30Z")

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Hello! I found that if i click on a not collapsible panel (without dragging) it disables buttons. Is that expected behaviour? If yes, can I change it? Here is some code to exemplify what i mean: main import g4p\_contr…

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## [Chladni patterns & interference patterns code understanding](https://discourse.processing.org/t/chladni-patterns-interference-patterns-code-understanding/17766)

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**Author:** [@Ruchi](https://discourse.processing.org/u/Ruchi)\
**Replies:** 3\
**Last updated:** [February 11, 2021, 4:35am UTC](https://discourse.processing.org/t/chladni-patterns-interference-patterns-code-understanding/17766 "2021-02-11T04:35:42Z")

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Chladni Pattern Interference Pattern I am referring to these patterns code by carlos ponce in open processing. I can’t seem to understand a bit of what is actually causing pattern. Dissecting it bit by bit but intuiti…

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## [Examples of 3D Alluvial Plots?](https://discourse.processing.org/t/examples-of-3d-alluvial-plots/27739)

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**Author:** [@tea\_tree](https://discourse.processing.org/u/tea_tree)\
**Replies:** 3\
**Last updated:** [February 11, 2021, 11:02pm UTC](https://discourse.processing.org/t/examples-of-3d-alluvial-plots/27739 "2021-02-11T23:02:36Z")

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Do you know of any libraries or projects that use some sort of 3-D alluvial plot to plot data with processing (obviously)?

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## [Algorithms for penrose tiling patterns](https://discourse.processing.org/t/algorithms-for-penrose-tiling-patterns/27741)

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**Author:** [@daniel.tran](https://discourse.processing.org/u/daniel.tran)\
**Replies:** 3\
**Last updated:** [February 11, 2021, 9:48pm UTC](https://discourse.processing.org/t/algorithms-for-penrose-tiling-patterns/27741 "2021-02-11T21:48:08Z")

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Hello, I was hoping to restart this thread from the user spinvector: I want to ask if anyone has any experience in this. They appear to be quite tricky to generate, as they don’t have translation symmetries. So I don’…

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## [Short 5 second .PNG animation](https://discourse.processing.org/t/short-5-second-png-animation/27664)

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**Author:** [@Huber542](https://discourse.processing.org/u/Huber542)\
**Replies:** 9\
**Last updated:** [February 11, 2021, 7:42pm UTC](https://discourse.processing.org/t/short-5-second-png-animation/27664 "2021-02-11T19:42:41Z")

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please format code with \</\> button \* homework policy \* asking questions Hey everyone! I’m VERY new, I’ve been assigned a small task of creating a moving animation. So what I decided I’d do is create some frames in p…

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## [Simulate Mouse click and Key (Robot class)](https://discourse.processing.org/t/simulate-mouse-click-and-key-robot-class/27709)

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**Author:** [@amarlo](https://discourse.processing.org/u/amarlo)\
**Replies:** 5\
**Last updated:** [February 11, 2021, 3:55pm UTC](https://discourse.processing.org/t/simulate-mouse-click-and-key-robot-class/27709 "2021-02-11T15:55:24Z")

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Hello, I have found some information about simulate click mouse and simulate a keypressed using Robot library. I am using Processing 3 and I dont find this library. Please, can you tell me where to download and informat…

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## [How can I make multiple objects of the same class to execute the same method at the same time?](https://discourse.processing.org/t/how-can-i-make-multiple-objects-of-the-same-class-to-execute-the-same-method-at-the-same-time/26654)

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**Author:** [@SailorToei](https://discourse.processing.org/u/SailorToei)\
**Replies:** 12\
**Last updated:** [February 11, 2021, 12:22pm UTC](https://discourse.processing.org/t/how-can-i-make-multiple-objects-of-the-same-class-to-execute-the-same-method-at-the-same-time/26654 "2021-02-11T12:22:20Z")

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Hello, I am working on a 3D game and in the world of the game are trees. The character class has a method, where its xPos, yPos and zPos are made equal with the variables ax, by and cz, which count for the whole program.…

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## [2d array expand()](https://discourse.processing.org/t/2d-array-expand/27732)

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**Author:** [@HeyHo](https://discourse.processing.org/u/HeyHo)\
**Replies:** 1\
**Last updated:** [February 11, 2021, 11:20am UTC](https://discourse.processing.org/t/2d-array-expand/27732 "2021-02-11T11:20:39Z")

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Hey! I just coded this little program: int path \[\]\[\] = new int\[1\]\[4\]; //path = {{0,0,0,0}} path \[0\]\[0\] = -1; //path = {{-1,0,0,0}} path = (int\[\]\[\])expand(path, path.length + 1); //path = {{-1,0,0,0}, //…

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## [JSON Objects Attribute sequence issue](https://discourse.processing.org/t/json-objects-attribute-sequence-issue/27700)

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**Author:** [@Ruchi](https://discourse.processing.org/u/Ruchi)\
**Replies:** 5\
**Last updated:** [February 11, 2021, 10:41am UTC](https://discourse.processing.org/t/json-objects-attribute-sequence-issue/27700 "2021-02-11T10:41:23Z")

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JSONObject json; JSONArray array; JSONObject loc; void setup() { size(800, 800); array = new JSONArray(); json = new JSONObject(); } void draw() { } void keyPressed() { if (key =='s') { for (int i=0; i\<…

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## [How to connect points with curveVertices?](https://discourse.processing.org/t/how-to-connect-points-with-curvevertices/27719)

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**Author:** [@tea\_tree](https://discourse.processing.org/u/tea_tree)\
**Replies:** 4\
**Last updated:** [February 11, 2021, 6:52am UTC](https://discourse.processing.org/t/how-to-connect-points-with-curvevertices/27719 "2021-02-11T06:52:15Z")

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I’m working on a project where I’m trying to connect points with curveVertex. I’m struggling to do that because I don’t know how to tell processing how to group values. I’m using the following raw data item class dat…

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## [Missing semicolon](https://discourse.processing.org/t/missing-semicolon/27721)

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**Author:** [@tea\_tree](https://discourse.processing.org/u/tea_tree)\
**Replies:** 3\
**Last updated:** [February 11, 2021, 5:08am UTC](https://discourse.processing.org/t/missing-semicolon/27721 "2021-02-11T05:08:18Z")

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My code throws an error (“missing ;”) and I don’t know why… int i =0; while (i \< books.size()){ for(i\<books.size(); i++){ } }

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## [G4P - Remember Option Selected in New Window](https://discourse.processing.org/t/g4p-remember-option-selected-in-new-window/27697)

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**Author:** [@alenmartel](https://discourse.processing.org/u/alenmartel)\
**Replies:** 3\
**Last updated:** [February 10, 2021, 9:55pm UTC](https://discourse.processing.org/t/g4p-remember-option-selected-in-new-window/27697 "2021-02-10T21:55:55Z")

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Good afternoon all; I’m making a little app and have only gotten as far as setting up the GUI using G4P. I’ve set it up so that there is a floating panel with buttons that open up more windows that let you select certai…

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## [(NOOB) How to keep a shape on screen after I release the mouse click?](https://discourse.processing.org/t/noob-how-to-keep-a-shape-on-screen-after-i-release-the-mouse-click/27712)

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**Author:** [@abo\_shack](https://discourse.processing.org/u/abo_shack)\
**Replies:** 3\
**Last updated:** [February 10, 2021, 8:06pm UTC](https://discourse.processing.org/t/noob-how-to-keep-a-shape-on-screen-after-i-release-the-mouse-click/27712 "2021-02-10T20:06:25Z")

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Hey guys, super noob here. I have a simple code where when I left click it produces a red dot, and when I right click it produces a blue dot. When I release my click the dot disappears. How do I get the dot to stay on th…

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## [Colormap an rgb or grayscale image to spectral - effect like thermal image](https://discourse.processing.org/t/colormap-an-rgb-or-grayscale-image-to-spectral-effect-like-thermal-image/27703)

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**Author:** [@dimpapadop](https://discourse.processing.org/u/dimpapadop)\
**Replies:** 4\
**Last updated:** [February 10, 2021, 4:38pm UTC](https://discourse.processing.org/t/colormap-an-rgb-or-grayscale-image-to-spectral-effect-like-thermal-image/27703 "2021-02-10T16:38:31Z")

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How can i achieve a colormapping effect from a pimage rgb (or even i could first convert to grayscale) to a range near the spectral like below? - based on brightness on grayscale. or based on blue and red brightness on r…

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## [Problems with Arrays](https://discourse.processing.org/t/problems-with-arrays/26933)

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**Author:** [@SailorToei](https://discourse.processing.org/u/SailorToei)\
**Replies:** 3\
**Last updated:** [February 10, 2021, 11:19am UTC](https://discourse.processing.org/t/problems-with-arrays/26933 "2021-02-10T11:19:30Z")

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Hello there, I previously asked how I can make objects of the same class to execute the same function at the same time. I think the solution to this problem is an array. Unfortuneately it does not work as intended. When…

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## [Looking for example BELL code using Wellen library](https://discourse.processing.org/t/looking-for-example-bell-code-using-wellen-library/27635)

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**Author:** [@PurpleSquircle](https://discourse.processing.org/u/PurpleSquircle)\
**Replies:** 3\
**Last updated:** [February 9, 2021, 9:27pm UTC](https://discourse.processing.org/t/looking-for-example-bell-code-using-wellen-library/27635 "2021-02-09T21:27:28Z")

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I’m using the Wellen audio library to create sounds for my second ever Processing project, so apologies if this is an easy question - I’m still a novice programmer. The library was updated in January to include a small b…

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## [Playing around with fluid simulation](https://discourse.processing.org/t/playing-around-with-fluid-simulation/27670)

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**Author:** [@pelinkiliboz](https://discourse.processing.org/u/pelinkiliboz)\
**Replies:** 3\
**Last updated:** [February 9, 2021, 12:27pm UTC](https://discourse.processing.org/t/playing-around-with-fluid-simulation/27670 "2021-02-09T12:27:45Z")

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Hello, I’ve been playing around with Daniel Shiffman’s fluid simulation tutorial and trying to find a way to add a different color every time the mouse is pressed (or when the color is chosen, is where I’m trying to get)…

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## [How to check whether value is in range](https://discourse.processing.org/t/how-to-check-whether-value-is-in-range/27680)

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**Author:** [@tea\_tree](https://discourse.processing.org/u/tea_tree)\
**Replies:** 2\
**Last updated:** [February 9, 2021, 3:42am UTC](https://discourse.processing.org/t/how-to-check-whether-value-is-in-range/27680 "2021-02-09T03:42:56Z")

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I’d like to check whether a value is in a range and then return a color accordingly. This is the first of many if statements: if(range.between(0,100).contains(value)){ c = #1a1334; } else if(Range.between(101,200).co…

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## [Individually targeting shapes?](https://discourse.processing.org/t/individually-targeting-shapes/27678)

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**Author:** [@wgm1](https://discourse.processing.org/u/wgm1)\
**Replies:** 1\
**Last updated:** [February 9, 2021, 12:48am UTC](https://discourse.processing.org/t/individually-targeting-shapes/27678 "2021-02-09T00:48:50Z")

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link to view: https://unruly-wooden-hippopotamus.glitch.me I’m trying to individually target each ellipse and change their speeds after they hit the halfway point so they all reach the end at the same time. Right now I…

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## [Ray Tracing In Processing is Possible!](https://discourse.processing.org/t/ray-tracing-in-processing-is-possible/27483)

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**Author:** [@humayung](https://discourse.processing.org/u/humayung)\
**Replies:** 4\
**Last updated:** [February 8, 2021, 7:34pm UTC](https://discourse.processing.org/t/ray-tracing-in-processing-is-possible/27483 "2021-02-08T19:34:54Z")

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I amazed of someone’s work: Ray Tracing In Console You can check his/her work on youtube The code is made in C++ so i try to port it into under processing environment and made some modifications. Nb: Dont ask me how i…

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## [Unexpected behavior of char\[\] in print / println](https://discourse.processing.org/t/unexpected-behavior-of-char-in-print-println/27609)

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**Author:** [@Thur](https://discourse.processing.org/u/Thur)\
**Replies:** 12\
**Last updated:** [February 8, 2021, 3:27pm UTC](https://discourse.processing.org/t/unexpected-behavior-of-char-in-print-println/27609 "2021-02-08T15:27:52Z")

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Hey. While working with an array of characters I checked the value of the array members by using the print / println function. The code boils down to : void setup() { char\[\] ch = new char\[2\]; ch\[0\] = ‘0’; ch\[1\] = ‘0’; …

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## [Problem sending byte array to Arduino over serial](https://discourse.processing.org/t/problem-sending-byte-array-to-arduino-over-serial/27628)

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**Author:** [@gonadgranny](https://discourse.processing.org/u/gonadgranny)\
**Replies:** 2\
**Last updated:** [February 8, 2021, 11:15am UTC](https://discourse.processing.org/t/problem-sending-byte-array-to-arduino-over-serial/27628 "2021-02-08T11:15:00Z")

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Hi there. I am trying to send a byte array to an arduino via serial. the array represents a jpeg image.i generated it by converting the image to hex values separated by commas.I chose this because this is what the arduin…

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