# Processing

**URL:** https://discourse.processing.org/c/processing/6.md?no_subcategories=false&page=343

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

**Page:** 344

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## [Begin a shape according to time](https://discourse.processing.org/t/begin-a-shape-according-to-time/5970)

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**Author:** [@Chloe65](https://discourse.processing.org/u/Chloe65)\
**Replies:** 2\
**Last updated:** [November 27, 2018, 11:28pm UTC](https://discourse.processing.org/t/begin-a-shape-according-to-time/5970 "2018-11-27T23:28:25Z")

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Hi everyone ! I am making an animation and I would like to start a shape a few seconds after launching my animation, but I don’t know if it is possible. I looked on forums, lessons, examples but I didn’t find anything… …

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## [SaveString() overwrite text in .txt file](https://discourse.processing.org/t/savestring-overwrite-text-in-txt-file/5996)

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**Author:** [@polispace](https://discourse.processing.org/u/polispace)\
**Replies:** 28\
**Last updated:** [November 27, 2018, 10:02pm UTC](https://discourse.processing.org/t/savestring-overwrite-text-in-txt-file/5996 "2018-11-27T22:02:32Z")

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Hi everyone. I receive single words form a microphone input that I will like to save in a text file. I manage to save one word in the text file, but when i say a new word the old one get overwritten. How can I add the…

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## [Collision detection with circle and square test](https://discourse.processing.org/t/collision-detection-with-circle-and-square-test/5859)

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**Author:** [@blankbleak](https://discourse.processing.org/u/blankbleak)\
**Replies:** 5\
**Last updated:** [November 27, 2018, 6:50pm UTC](https://discourse.processing.org/t/collision-detection-with-circle-and-square-test/5859 "2018-11-27T18:50:40Z")

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Hi, I am struggling with learning how to use colission detection in processing, and i would really appreciate some help, I have tried everything in my power to figure it out, but I just can’t do it. For a project in my c…

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## [I can't seem to download processing](https://discourse.processing.org/t/i-cant-seem-to-download-processing/6003)

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**Author:** [@jackshanahan](https://discourse.processing.org/u/jackshanahan)\
**Replies:** 2\
**Last updated:** [November 27, 2018, 6:18pm UTC](https://discourse.processing.org/t/i-cant-seem-to-download-processing/6003 "2018-11-27T18:18:34Z")

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I keep downloading the windows 64-bit version on my laptop and the 34 just in case and when i download them i open it and it comes up in a 7-bit file manager. I thought it would come up as an application on my homescreen…

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## [Edit/Transform rect() together with the video beneath it?](https://discourse.processing.org/t/edit-transform-rect-together-with-the-video-beneath-it/5990)

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**Author:** [@kratskcinnay](https://discourse.processing.org/u/kratskcinnay)\
**Replies:** 1\
**Last updated:** [November 27, 2018, 6:06pm UTC](https://discourse.processing.org/t/edit-transform-rect-together-with-the-video-beneath-it/5990 "2018-11-27T18:06:28Z")

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Hey everyone, I’m pretty sure this should be fairly easy but I couldn’t figure out a way to do it and didn’t find anything online (probably because it’s to obvious :D). I am using using a video that i am cutting and cr…

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## [NoSuchMethodException using reflection](https://discourse.processing.org/t/nosuchmethodexception-using-reflection/5976)

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**Author:** [@clankill3r](https://discourse.processing.org/u/clankill3r)\
**Replies:** 6\
**Last updated:** [November 27, 2018, 2:01pm UTC](https://discourse.processing.org/t/nosuchmethodexception-using-reflection/5976 "2018-11-27T14:01:47Z")

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I wan’t to use the protected method colorCalc in the PGraphics object. I get a NoSuchMethodException and I have no clue why. Can someone help? import java.lang.reflect.\*; void setup() { int c = g\_color(g, 128); } …

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## [How to update a code that display a word-cloud with new words?](https://discourse.processing.org/t/how-to-update-a-code-that-display-a-word-cloud-with-new-words/5992)

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**Author:** [@polispace](https://discourse.processing.org/u/polispace)\
**Replies:** 0\
**Last updated:** [November 27, 2018, 11:37am UTC](https://discourse.processing.org/t/how-to-update-a-code-that-display-a-word-cloud-with-new-words/5992 "2018-11-27T11:37:41Z")

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Hi everyone I’m doing an installation for a project, this is my stand point. What do I want to achieve: A program that display a word-cloud (the more a specific word has been say, the bigger it appears in the word clo…

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## [How to increase freq with a keyPressed func over than mouseMoved](https://discourse.processing.org/t/how-to-increase-freq-with-a-keypressed-func-over-than-mousemoved/5987)

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**Author:** [@admbdr](https://discourse.processing.org/u/admbdr)\
**Replies:** 1\
**Last updated:** [November 27, 2018, 10:15am UTC](https://discourse.processing.org/t/how-to-increase-freq-with-a-keypressed-func-over-than-mousemoved/5987 "2018-11-27T10:15:41Z")

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import ddf.minim.\*; import ddf.minim.ugens.\*; Minim minim; AudioOutput out; Oscil wave; void setup() { size(512, 200, P3D); minim = new Minim(this); // use the getLineOut method of the Minim obj…

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## [How to visualize forces of a particle system?](https://discourse.processing.org/t/how-to-visualize-forces-of-a-particle-system/5751)

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**Author:** [@Lexyth](https://discourse.processing.org/u/Lexyth)\
**Replies:** 20\
**Last updated:** [November 27, 2018, 9:15am UTC](https://discourse.processing.org/t/how-to-visualize-forces-of-a-particle-system/5751 "2018-11-27T09:15:16Z")

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I’ve got a particle system with particles that attract and repel each other based on their distance. What i need now is a way to make the forces of those particles visible. Something like a magnetic field visualization. …

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## [Make a graph plz help](https://discourse.processing.org/t/make-a-graph-plz-help/5300)

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**Author:** [@martijnroks](https://discourse.processing.org/u/martijnroks)\
**Replies:** 20\
**Last updated:** [November 27, 2018, 7:52am UTC](https://discourse.processing.org/t/make-a-graph-plz-help/5300 "2018-11-27T07:52:09Z")

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Hello, I need to make a graph like this: But I need on both axis 0 to 1000. I get from the arduino random digits that I need to implemend in the graph, this needs to be in real time, so the graphs needs to update it…

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## [Adding a stopwatch to a clock](https://discourse.processing.org/t/adding-a-stopwatch-to-a-clock/5973)

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**Author:** [@yamiyugi](https://discourse.processing.org/u/yamiyugi)\
**Replies:** 1\
**Last updated:** [November 27, 2018, 5:31am UTC](https://discourse.processing.org/t/adding-a-stopwatch-to-a-clock/5973 "2018-11-27T05:31:09Z")

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Hi! I’m trying to add a stopwatch to my clock. When I start the program the clock shows the current time and I want to add a stopwatch that starts when the mouse is clicked. The clock itself works but I can’t get my sto…

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## [Best Way of Mixing in UI Elements?](https://discourse.processing.org/t/best-way-of-mixing-in-ui-elements/5979)

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**Author:** [@MauiMana](https://discourse.processing.org/u/MauiMana)\
**Replies:** 2\
**Last updated:** [November 27, 2018, 1:40am UTC](https://discourse.processing.org/t/best-way-of-mixing-in-ui-elements/5979 "2018-11-27T01:40:52Z")

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I’m fairly new to ‘processing’ so please forgive me if I’m missing something obvious. I’m needing to add some user interaction to my processing application. At the very minimum I’m looking to be able to pose various ques…

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## [Question about OOP](https://discourse.processing.org/t/question-about-oop/5960)

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**Author:** [@vjjv](https://discourse.processing.org/u/vjjv)\
**Replies:** 1\
**Last updated:** [November 27, 2018, 12:15am UTC](https://discourse.processing.org/t/question-about-oop/5960 "2018-11-27T00:15:42Z")

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hello! i\`ve a deep question: imagine that you have objects (maybe an ellipse) and differents behaviors (move up, down, left, rigth) what would be the best way to program in a OOP paradigm? using interfaces? i mean, i wou…

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## [How to add a trail particle effect to a moving circle?](https://discourse.processing.org/t/how-to-add-a-trail-particle-effect-to-a-moving-circle/5967)

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**Author:** [@francium401](https://discourse.processing.org/u/francium401)\
**Replies:** 1\
**Last updated:** [November 26, 2018, 9:09pm UTC](https://discourse.processing.org/t/how-to-add-a-trail-particle-effect-to-a-moving-circle/5967 "2018-11-26T21:09:30Z")

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Basically what I have here is a circle orbiting another (very tinier) circle. What I’ve been trying to figure out is how to add a trail particle effect to the orbiting circle, where the end of the trail fades from white…

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## [Debugging Game P5js](https://discourse.processing.org/t/debugging-game-p5js/5966)

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**Author:** [@shoneyjosh](https://discourse.processing.org/u/shoneyjosh)\
**Replies:** 1\
**Last updated:** [November 26, 2018, 8:17pm UTC](https://discourse.processing.org/t/debugging-game-p5js/5966 "2018-11-26T20:17:35Z")

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It is a game where you avoid the incoming enemies. Uncaught TypeError: Cannot read property ‘x’ of undefined (sketch: line 62) whenever the enemy hits the player //loop through all enemies for(var i = 0; i \< enemies…

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## [Collision between two ArrayList elements](https://discourse.processing.org/t/collision-between-two-arraylist-elements/5932)

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**Author:** [@Rangerz132](https://discourse.processing.org/u/Rangerz132)\
**Replies:** 10\
**Last updated:** [November 26, 2018, 7:27pm UTC](https://discourse.processing.org/t/collision-between-two-arraylist-elements/5932 "2018-11-26T19:27:52Z")

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Hi everyone! I’m currently at University in Multimedia and I’m learning Processing (which is pretty cool). For my lastest project, I need to do a game where there is some collisions. The problem is that I know how to d…

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## [How do you display motion/coded art at home?](https://discourse.processing.org/t/how-do-you-display-motion-coded-art-at-home/5852)

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**Author:** [@Vane\_Tempest](https://discourse.processing.org/u/Vane_Tempest)\
**Replies:** 5\
**Last updated:** [November 26, 2018, 3:34pm UTC](https://discourse.processing.org/t/how-do-you-display-motion-coded-art-at-home/5852 "2018-11-26T15:34:21Z")

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Does anyone display generative/coded/motion artwork (yours or other peoples) at home? I always find it such a shame that motion artwork is often printed as a snapshot, instead of being displayed in its native format wit…

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## [Fixed size with scroll](https://discourse.processing.org/t/fixed-size-with-scroll/5947)

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**Author:** [@HelaRua](https://discourse.processing.org/u/HelaRua)\
**Replies:** 1\
**Last updated:** [November 26, 2018, 12:40pm UTC](https://discourse.processing.org/t/fixed-size-with-scroll/5947 "2018-11-26T12:40:15Z")

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Hi :slight\_smile: I’m very new to processing. —noob alert— For my college project I’m trying to create a background with a fixed size at first glance (2560x1600) but is in reality bigger than that (3840x3200), allowing…

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## [Trouble with sampleRate() in Processing](https://discourse.processing.org/t/trouble-with-samplerate-in-processing/5906)

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**Author:** [@nomnom](https://discourse.processing.org/u/nomnom)\
**Replies:** 2\
**Last updated:** [November 26, 2018, 8:32am UTC](https://discourse.processing.org/t/trouble-with-samplerate-in-processing/5906 "2018-11-26T08:32:25Z")

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Hi! I just got started with programming and I’m having some trouble with an assignment. As far as I understand this, I’ve followed the instructions of the documentation correctly, but my code still doesn’t work. I’m tr…

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## [Processing to draw NACA 4 digit airfoils](https://discourse.processing.org/t/processing-to-draw-naca-4-digit-airfoils/5739)

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**Author:** [@HackinHarry](https://discourse.processing.org/u/HackinHarry)\
**Replies:** 5\
**Last updated:** [November 21, 2018, 5:32am UTC](https://discourse.processing.org/t/processing-to-draw-naca-4-digit-airfoils/5739 "2018-11-21T05:32:32Z")

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I want to use processing to draw NACA 4 digit airfoils. Ive been to lots of NASA websites, read a few papers, found some python code, messed with a java applet and still got NADA. I understand basically how they are ge…

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## [Physically based Sound](https://discourse.processing.org/t/physically-based-sound/5937)

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**Author:** [@mmncit](https://discourse.processing.org/u/mmncit)\
**Replies:** 2\
**Last updated:** [November 26, 2018, 2:00am UTC](https://discourse.processing.org/t/physically-based-sound/5937 "2018-11-26T02:00:28Z")

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Is there any way to produce sound in Processing without incorporating sound file? What I mean is generating physically based sound based on interactive simulation and animation. Please check the video FoleyAutomatic

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## [Background of Triangular objects](https://discourse.processing.org/t/background-of-triangular-objects/5857)

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**Author:** [@jbott](https://discourse.processing.org/u/jbott)\
**Replies:** 5\
**Last updated:** [November 26, 2018, 1:25am UTC](https://discourse.processing.org/t/background-of-triangular-objects/5857 "2018-11-26T01:25:58Z")

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Hey guys! I’ve been playing around with processing as of yesterday and am stuck on creating a background of triangular objects for my project. The idea of the project is to have triangles in the background so that I can…

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## ["water powered TV" - worked with Mac but not with Windows 10](https://discourse.processing.org/t/water-powered-tv-worked-with-mac-but-not-with-windows-10/5919)

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**Author:** [@Nancy](https://discourse.processing.org/u/Nancy)\
**Replies:** 0\
**Last updated:** [November 25, 2018, 3:29pm UTC](https://discourse.processing.org/t/water-powered-tv-worked-with-mac-but-not-with-windows-10/5919 "2018-11-25T15:29:51Z")

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Hi, I am a novice of Processing and coding in general. I had a lot of help creating a “water powered” TV with the use of a Mac Mini, Makeymakey and Processing. Through a lot of trial and error we got it to work with the…

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## [PVector.rotate() rounding bug?](https://discourse.processing.org/t/pvector-rotate-rounding-bug/5929)

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**Author:** [@JOW](https://discourse.processing.org/u/JOW)\
**Replies:** 7\
**Last updated:** [November 25, 2018, 6:22pm UTC](https://discourse.processing.org/t/pvector-rotate-rounding-bug/5929 "2018-11-25T18:22:34Z")

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I was rotating some vectors and got some strange behaviour.It seems like the PVector.rotate() implementation has some rounding error bug in it, as it scales the vector as it rotates it. I wrote a simple program/snippet …

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## [I need help is to make an easy game but i have some problem now](https://discourse.processing.org/t/i-need-help-is-to-make-an-easy-game-but-i-have-some-problem-now/5803)

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**Author:** [@nhghi](https://discourse.processing.org/u/nhghi)\
**Replies:** 2\
**Last updated:** [November 25, 2018, 5:23pm UTC](https://discourse.processing.org/t/i-need-help-is-to-make-an-easy-game-but-i-have-some-problem-now/5803 "2018-11-25T17:23:00Z")

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my basic idea is to draw a small planet (ellipse code) and then make it move. But I want to minimize where it can go. like I will make a boolean ( kinda hitbox) wich smaller than my planet, if the hitbox touches the rea…

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## [A simplified version of a Yahtzee game](https://discourse.processing.org/t/a-simplified-version-of-a-yahtzee-game/5922)

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**Author:** [@James](https://discourse.processing.org/u/James)\
**Replies:** 2\
**Last updated:** [November 25, 2018, 5:20pm UTC](https://discourse.processing.org/t/a-simplified-version-of-a-yahtzee-game/5922 "2018-11-25T17:20:13Z")

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Hello y’all I’m trying to make a simplified version of a Yahtzee game I am stuck trying to display the frequencies of each number(1 to 6) and returning the result as an array of the Sides on the Dice in integers. It i…

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## [Splitting up a webcam video into 3 parts and rearranging them](https://discourse.processing.org/t/splitting-up-a-webcam-video-into-3-parts-and-rearranging-them/5856)

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**Author:** [@kratskcinnay](https://discourse.processing.org/u/kratskcinnay)\
**Replies:** 4\
**Last updated:** [November 25, 2018, 3:40pm UTC](https://discourse.processing.org/t/splitting-up-a-webcam-video-into-3-parts-and-rearranging-them/5856 "2018-11-25T15:40:47Z")

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Hello everyone, I am fairly new to processing and to coding in general so I’m having a hard time, figuring this out. I am currently working on a video installation that is supposed to film someone standing on a marked …

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## [\[SOLVED\] P3D ellipse rotation problem](https://discourse.processing.org/t/solved-p3d-ellipse-rotation-problem/5908)

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**Author:** [@megagoose](https://discourse.processing.org/u/megagoose)\
**Replies:** 4\
**Last updated:** [November 25, 2018, 3:09pm UTC](https://discourse.processing.org/t/solved-p3d-ellipse-rotation-problem/5908 "2018-11-25T15:09:25Z")

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Hello there fellow coders! Let’s say I want to rotate an ellipse around it’s axis. I came up with the following code, but it is not doing what I want. float alpha = 0; int r = 200; void setup() { size(500, 500, P3D)…

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## [Questions about BouncyBubbles example](https://discourse.processing.org/t/questions-about-bouncybubbles-example/5883)

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**Author:** [@amundsen](https://discourse.processing.org/u/amundsen)\
**Replies:** 26\
**Last updated:** [November 25, 2018, 12:02pm UTC](https://discourse.processing.org/t/questions-about-bouncybubbles-example/5883 "2018-11-25T12:02:07Z")

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Hello, I am trying to fully understand the Java BouncyBubbles example. Here’s the code: int numBalls = 12; float spring = 0.05; float gravity = 0.03; float friction = -0.9; Ball\[\] balls = new Ball\[numBalls\]; void set…

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## [Detecting when the mouse enters / exits sketch window](https://discourse.processing.org/t/detecting-when-the-mouse-enters-exits-sketch-window/5798)

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**Author:** [@quark](https://discourse.processing.org/u/quark)\
**Replies:** 7\
**Last updated:** [November 25, 2018, 9:34am UTC](https://discourse.processing.org/t/detecting-when-the-mouse-enters-exits-sketch-window/5798 "2018-11-25T09:34:40Z")

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I am interested in creating a new feature for G4P but I need to detect when the mouse enters and exits the client area (drawing area) of the sketch. Since Processing does not generate these events I am trying to do this…

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