# Processing

**URL:** https://discourse.processing.org/c/processing/6.md?page=225

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**Page:** 226

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## [Delay on first collision, but not subsequent ones](https://discourse.processing.org/t/delay-on-first-collision-but-not-subsequent-ones/18989)

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**Author:** [@SheCurvesMobius](https://discourse.processing.org/u/SheCurvesMobius)\
**Replies:** 5\
**Last updated:** [March 28, 2020, 3:12pm UTC](https://discourse.processing.org/t/delay-on-first-collision-but-not-subsequent-ones/18989 "2020-03-28T15:12:42Z")

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Hi all, I’m wondering if anyone can let me know why I get a considerable delay (a few seconds) when one object collides with another for the first time, but then after that there’s no delay. Here’s my code: PImage\[\] pl…

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## [Adjusting window size AND shape size](https://discourse.processing.org/t/adjusting-window-size-and-shape-size/19025)

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**Author:** [@Tina](https://discourse.processing.org/u/Tina)\
**Replies:** 3\
**Last updated:** [March 28, 2020, 12:28pm UTC](https://discourse.processing.org/t/adjusting-window-size-and-shape-size/19025 "2020-03-28T12:28:51Z")

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I want to code my program so that regardless of what the window size is modified to, the shape (rectangle) will also change according to the new size. In other words, the rectangle size and position should adjust if the …

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## [Looping through JSON properties](https://discourse.processing.org/t/looping-through-json-properties/19090)

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**Author:** [@Odermonicon](https://discourse.processing.org/u/Odermonicon)\
**Replies:** 16\
**Last updated:** [March 28, 2020, 11:23am UTC](https://discourse.processing.org/t/looping-through-json-properties/19090 "2020-03-28T11:23:28Z")

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I need to loop through a JSON file that looks like this: JSON"blocks":{ "vJb19r)WPw88AL7K#^ZI":{ "opcode":"control\_incr\_counter", "next":"IV.E7vBXTcdK0jZYX}…

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## [Flow Field (Perlin noise)"Array Index Out Of Bounds Exception" Error](https://discourse.processing.org/t/flow-field-perlin-noise-array-index-out-of-bounds-exception-error/19098)

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**Author:** [@niuuin](https://discourse.processing.org/u/niuuin)\
**Replies:** 2\
**Last updated:** [March 28, 2020, 9:16am UTC](https://discourse.processing.org/t/flow-field-perlin-noise-array-index-out-of-bounds-exception-error/19098 "2020-03-28T09:16:45Z")

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Hi everyone, I try to convert Coding Challenge #24: Perlin Noise Flow Field to processing，But encountered “ArrayIndexOutOfBoundsException” Error,This is my code: float inc = 0.1; int scl = 20; int cols, rows; float …

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## [Verbose code (how to shorten)](https://discourse.processing.org/t/verbose-code-how-to-shorten/19018)

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**Author:** [@paulstgeorge](https://discourse.processing.org/u/paulstgeorge)\
**Replies:** 4\
**Last updated:** [March 28, 2020, 1:37am UTC](https://discourse.processing.org/t/verbose-code-how-to-shorten/19018 "2020-03-28T01:37:43Z")

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I have this sketch (see below). Everything works, the green balls are healthy, the red balls are sick, if a green ball and a red ball collide the red ball infects the green ball and they both end up sick. After a while a…

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## [Rotating images without interfering with translation (new to coding!)](https://discourse.processing.org/t/rotating-images-without-interfering-with-translation-new-to-coding/19003)

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**Author:** [@semi\_cologne](https://discourse.processing.org/u/semi_cologne)\
**Replies:** 4\
**Last updated:** [March 27, 2020, 11:13pm UTC](https://discourse.processing.org/t/rotating-images-without-interfering-with-translation-new-to-coding/19003 "2020-03-27T23:13:14Z")

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Hey coders, I’m working on a clock using a png image. every second the image moves vertically, but every minute I am trying to make the image rotate. That said even with experimenting with push and pop matrixes, I still …

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## [Trying to write a simple snake game with arrays but I run into an error](https://discourse.processing.org/t/trying-to-write-a-simple-snake-game-with-arrays-but-i-run-into-an-error/19065)

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**Author:** [@creedin](https://discourse.processing.org/u/creedin)\
**Replies:** 2\
**Last updated:** [March 27, 2020, 8:25pm UTC](https://discourse.processing.org/t/trying-to-write-a-simple-snake-game-with-arrays-but-i-run-into-an-error/19065 "2020-03-27T20:25:11Z")

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float\[\] xpos; float\[\] ypos; void setup() { size(500,500); } void draw() { background(255); for (int i = 0; i \< xpos.length - 1; i++) { xpos\[i\] = xpos\[i + 1\]; ypos\[i\] = ypos\[i + 1\]; } xpos\[xpos.lengt…

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## [Square with resizeable rectangles inside](https://discourse.processing.org/t/square-with-resizeable-rectangles-inside/14482)

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**Author:** [@BooWseR](https://discourse.processing.org/u/BooWseR)\
**Replies:** 8\
**Last updated:** [March 27, 2020, 8:21pm UTC](https://discourse.processing.org/t/square-with-resizeable-rectangles-inside/14482 "2020-03-27T20:21:27Z")

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Hi Guys, i’m pretty new with processing and have a problem: I need a square with different squares in it. These should be changeable in size, but not smaller than a certain minimum size. I have tried different approach…

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## [How to delete an object in a class?](https://discourse.processing.org/t/how-to-delete-an-object-in-a-class/19067)

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**Author:** [@Cybernet](https://discourse.processing.org/u/Cybernet)\
**Replies:** 7\
**Last updated:** [March 27, 2020, 5:32pm UTC](https://discourse.processing.org/t/how-to-delete-an-object-in-a-class/19067 "2020-03-27T17:32:15Z")

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So I have a class that is a bullet. And if the bullet is out of bound, then it will delete the object. But how do I do this? Here is my code. class Bullet { if (xpos \> 500 || ypos \> 500) delete object // how…

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## [Instantiate variable of outside class](https://discourse.processing.org/t/instantiate-variable-of-outside-class/19088)

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**Author:** [@Dennis](https://discourse.processing.org/u/Dennis)\
**Replies:** 3\
**Last updated:** [March 27, 2020, 5:30pm UTC](https://discourse.processing.org/t/instantiate-variable-of-outside-class/19088 "2020-03-27T17:30:43Z")

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GoodMorning, I have a question about of usage this parameter in contructor class. My minimal code is: import processing.video.\*; class MediaLoad { File file; Movie mov; MediaLoad (File \_file) { \_file = file; …

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## [Switching from keypressed to using an array](https://discourse.processing.org/t/switching-from-keypressed-to-using-an-array/19053)

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**Author:** [@MichelO](https://discourse.processing.org/u/MichelO)\
**Replies:** 1\
**Last updated:** [March 26, 2020, 8:39pm UTC](https://discourse.processing.org/t/switching-from-keypressed-to-using-an-array/19053 "2020-03-26T20:39:54Z")

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I have code that draws a multi-colored spiral pattern with different line lengths and colors depending on which number keys are pressed. I would like to change this to reading the numbers from an array, but I am having s…

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## [My decimal is too small](https://discourse.processing.org/t/my-decimal-is-too-small/19041)

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**Author:** [@Cybernet](https://discourse.processing.org/u/Cybernet)\
**Replies:** 8\
**Last updated:** [March 27, 2020, 9:06am UTC](https://discourse.processing.org/t/my-decimal-is-too-small/19041 "2020-03-27T09:06:12Z")

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Here is my example of my code: value = -1 / (value1 - value2); println(xdirection); It is very simple. I am trying to take the negative reciprocal of a value. But the number is too small, and when I try to print the v…

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## [Processing 3 : two windows at time , one 2d and one 3d](https://discourse.processing.org/t/processing-3-two-windows-at-time-one-2d-and-one-3d/19019)

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**Author:** [@Bob63](https://discourse.processing.org/u/Bob63)\
**Replies:** 2\
**Last updated:** [March 27, 2020, 2:17am UTC](https://discourse.processing.org/t/processing-3-two-windows-at-time-one-2d-and-one-3d/19019 "2020-03-27T02:17:26Z")

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Hi, I’m quite new of Processing 3,and is my first post in the forum. I’m working on a project that require two windows , one 2D and one 3d. The 2D window will be used to display a series of fata coming from a serial por…

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## [Plotting Parametric Equations](https://discourse.processing.org/t/plotting-parametric-equations/18947)

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**Author:** [@rubbs](https://discourse.processing.org/u/rubbs)\
**Replies:** 3\
**Last updated:** [March 26, 2020, 11:04pm UTC](https://discourse.processing.org/t/plotting-parametric-equations/18947 "2020-03-26T23:04:06Z")

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Hello, I believe that I have almost correctly drawn-out a hyperbolic helicoid: (https://mathworld.wolfram.com/HyperbolicHelicoid.html). But there is some odd behavior, I think it’s because I am not calculating torsion…

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## [Game speed after certain score is reached](https://discourse.processing.org/t/game-speed-after-certain-score-is-reached/19043)

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**Author:** [@Banana132](https://discourse.processing.org/u/Banana132)\
**Replies:** 4\
**Last updated:** [March 26, 2020, 10:16pm UTC](https://discourse.processing.org/t/game-speed-after-certain-score-is-reached/19043 "2020-03-26T22:16:28Z")

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Hi there, I am creating a game where the player has to avoid some asteriods, and gain a good score. After going past a certain score, the game speed increases. At the moment i have this playerScore.countUp(); textAl…

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## [ArrayIndexOutOfBoundsException: 168270](https://discourse.processing.org/t/arrayindexoutofboundsexception-168270/19057)

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**Author:** [@jojo1515](https://discourse.processing.org/u/jojo1515)\
**Replies:** 2\
**Last updated:** [March 26, 2020, 10:07pm UTC](https://discourse.processing.org/t/arrayindexoutofboundsexception-168270/19057 "2020-03-26T22:07:06Z")

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Hey guys I have been trying to manipulate pixels on an image, following the youtube tutorial: https://www.youtube.com/watch?v=j-ZLDEnhT3Q by the Coding Train. I can’t seem to get it to work. Error code reads… ArrayInde…

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## [If statements within an array of digits](https://discourse.processing.org/t/if-statements-within-an-array-of-digits/18507)

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**Author:** [@MichelO](https://discourse.processing.org/u/MichelO)\
**Replies:** 6\
**Last updated:** [March 26, 2020, 7:54pm UTC](https://discourse.processing.org/t/if-statements-within-an-array-of-digits/18507 "2020-03-26T19:54:40Z")

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I am trying to have different things happen depending on what digit is called in an array–in this case, different colored lines. I am not sure how to code the if statement to recognize a particular digit. This is what I …

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## [How to draw a continuous line with sensor values from Arduino](https://discourse.processing.org/t/how-to-draw-a-continuous-line-with-sensor-values-from-arduino/19033)

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**Author:** [@Gbouna](https://discourse.processing.org/u/Gbouna)\
**Replies:** 2\
**Last updated:** [March 26, 2020, 2:23pm UTC](https://discourse.processing.org/t/how-to-draw-a-continuous-line-with-sensor-values-from-arduino/19033 "2020-03-26T14:23:46Z")

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Hello; I’m so new to processing and I need help with my code. Basically i have a sensor connected to Arduino that sends out data of an array of data. I’m able to send the data to processing and gets them converted to i…

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## [Circles that will disappear when the mouse hovers](https://discourse.processing.org/t/circles-that-will-disappear-when-the-mouse-hovers/19035)

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**Author:** [@lozozo](https://discourse.processing.org/u/lozozo)\
**Replies:** 1\
**Last updated:** [March 26, 2020, 1:31pm UTC](https://discourse.processing.org/t/circles-that-will-disappear-when-the-mouse-hovers/19035 "2020-03-26T13:31:16Z")

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Hi, I am new to coding, I’ve only just starting being taught it. I need to create a project - I have an idea for it but am unsure how to create it. Essentially I want to create a line of circles going vertically down t…

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## [Fade Effect - What's with the ghost?](https://discourse.processing.org/t/fade-effect-whats-with-the-ghost/18891)

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**Author:** [@Tomfoolery](https://discourse.processing.org/u/Tomfoolery)\
**Replies:** 14\
**Last updated:** [March 26, 2020, 8:57am UTC](https://discourse.processing.org/t/fade-effect-whats-with-the-ghost/18891 "2020-03-26T08:57:21Z")

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My intention is to create a fade effect for thousands of shapes on the canvas (They appear, and then fade into blackness). This is the solution I came up with, and have found other people using. void draw() { fill(…

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## [Is there a way to set an "internal" timer?](https://discourse.processing.org/t/is-there-a-way-to-set-an-internal-timer/19022)

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**Author:** [@Cybernet](https://discourse.processing.org/u/Cybernet)\
**Replies:** 1\
**Last updated:** [March 26, 2020, 1:47am UTC](https://discourse.processing.org/t/is-there-a-way-to-set-an-internal-timer/19022 "2020-03-26T01:47:57Z")

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So I’m making a game where a character shoots. And I need a delay between bullet shots. However, I don’t want to use delay(x) since that will affect the entire game. Can I set a delay inside my void ShootBullet() functi…

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## [Crackling Noise Bug](https://discourse.processing.org/t/crackling-noise-bug/18021)

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**Author:** [@LordCacops](https://discourse.processing.org/u/LordCacops)\
**Replies:** 15\
**Last updated:** [March 25, 2020, 3:58am UTC](https://discourse.processing.org/t/crackling-noise-bug/18021 "2020-03-25T03:58:33Z")

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Hello, I am working on a sketch that activates sound files, but after a while I get a crackling noise that then won’t go away. I believe this happens when too many files are attempted to be played at once. Instead of th…

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## [How do I make mouse controlled paddle stop glitching](https://discourse.processing.org/t/how-do-i-make-mouse-controlled-paddle-stop-glitching/18922)

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**Author:** [@WeeBoEtte](https://discourse.processing.org/u/WeeBoEtte)\
**Replies:** 4\
**Last updated:** [March 25, 2020, 1:12am UTC](https://discourse.processing.org/t/how-do-i-make-mouse-controlled-paddle-stop-glitching/18922 "2020-03-25T01:12:55Z")

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I’m am trying to make a pong game where one player controls with the mouse and the other controls with the keyboard. I got my mouse to move the paddle, but it keeps glitching to different places on the screen. Any ideas? …

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## [PGraphics behaving unexpectedly](https://discourse.processing.org/t/pgraphics-behaving-unexpectedly/18710)

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**Author:** [@hamoid](https://discourse.processing.org/u/hamoid)\
**Replies:** 6\
**Last updated:** [March 25, 2020, 1:02am UTC](https://discourse.processing.org/t/pgraphics-behaving-unexpectedly/18710 "2020-03-25T01:02:14Z")

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Hi there, This is no longer behaving as it used to. If I’m not too sleepy, this program should draw a black screen, but I see it magenta. If inside draw() I remove everything except image(...) then it’s black. PGraphic…

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## [Trigger animation effect after object collision](https://discourse.processing.org/t/trigger-animation-effect-after-object-collision/18811)

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**Author:** [@codingcomplexity](https://discourse.processing.org/u/codingcomplexity)\
**Replies:** 14\
**Last updated:** [March 24, 2020, 11:42pm UTC](https://discourse.processing.org/t/trigger-animation-effect-after-object-collision/18811 "2020-03-24T23:42:36Z")

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I want to create a “pulse” effect after objects collide with each other. The intended effect in this example is that when the particles collide (come within a certain distance from each other) an ellipse appears, grows t…

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## [KeyPressed() for multiple keys pressed at the same time](https://discourse.processing.org/t/keypressed-for-multiple-keys-pressed-at-the-same-time/18892)

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**Author:** [@graysonh](https://discourse.processing.org/u/graysonh)\
**Replies:** 7\
**Last updated:** [March 24, 2020, 9:47pm UTC](https://discourse.processing.org/t/keypressed-for-multiple-keys-pressed-at-the-same-time/18892 "2020-03-24T21:47:35Z")

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Hi everyone, I’m running into a confusing issue with the keyPressed() function when I have multiple keys pressed at the same time. It seems like after two or more keys are pressed the keyPressed() functionality no longe…

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## [Draw shape performance drop when iterating over children](https://discourse.processing.org/t/draw-shape-performance-drop-when-iterating-over-children/18972)

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**Author:** [@LuisFerreira](https://discourse.processing.org/u/LuisFerreira)\
**Replies:** 3\
**Last updated:** [March 24, 2020, 4:59pm UTC](https://discourse.processing.org/t/draw-shape-performance-drop-when-iterating-over-children/18972 "2020-03-24T16:59:34Z")

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Hi, i have a question regarding the way Processing draws 3D shapes. I have a complex 3D model (121521 polygons), where the “top level” shape is a group and all children are triangles. When i draw this model with the bui…

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## [Help with Shapes (Smiley Face)](https://discourse.processing.org/t/help-with-shapes-smiley-face/18978)

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**Author:** [@tengtengloves](https://discourse.processing.org/u/tengtengloves)\
**Replies:** 2\
**Last updated:** [March 24, 2020, 4:12pm UTC](https://discourse.processing.org/t/help-with-shapes-smiley-face/18978 "2020-03-24T16:12:03Z")

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Hi all, I’m lost with my assignment. I would like to create this flower petal with smiley face but I not sure how to process. I need someone to help, thanks!

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## [Processing and Max Msp - Send data from Processing to Max Msp](https://discourse.processing.org/t/processing-and-max-msp-send-data-from-processing-to-max-msp/3364)

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**Author:** [@Davide](https://discourse.processing.org/u/Davide)\
**Replies:** 4\
**Last updated:** [March 24, 2020, 3:16pm UTC](https://discourse.processing.org/t/processing-and-max-msp-send-data-from-processing-to-max-msp/3364 "2020-03-24T15:16:27Z")

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Hello everyone, it’s been a few weeks since I’m trying to send the values of some variables from Processing to Max Msp through the Oscp5 library. Being a newcomer in programming with java and processing, and not being a…

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## [VIDEO IP (NewTek NDI)](https://discourse.processing.org/t/video-ip-newtek-ndi/16037)

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**Author:** [@Romain](https://discourse.processing.org/u/Romain)\
**Replies:** 15\
**Last updated:** [March 24, 2020, 2:27pm UTC](https://discourse.processing.org/t/video-ip-newtek-ndi/16037 "2020-03-24T14:27:07Z")

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Hi ! Is there any new solutions for ip video in Processing 3 ? I know the good library “ip capture” but only for receiving video, is there now the possibility to integrate the very good new tech NDI in processing for ex…

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