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This repository contains the source code for the Processing project for people who want to help improve the code.

If you're interested in using Processing, get started at the download page, or read more about the project at the home page. There are also several tutorials that provide a helpful introduction. They are complemented by hundreds of examples that are included with the software itself.

Processing 4.0

Processing 4 has important updates that prepare the platform for its future. Most significantly, this includes the move to Java 17 as well as major changes to the range of platforms we support (Apple Silicon! Raspberry Pi on 32- and 64-bit ARM!)

With any luck, many changes should be transparent to most users, in spite of how much is updated behind the scenes. More immediately visible changes include major work on the UI, including “themes” and the ability to change how sketches are named by default.

Building the Code

Instructions on how to build the code are found in a README inside the build folder.

We've also moved to a new repository for this release so that we could cull a lot of the accumulated mess of the last 20 years, which makes git clone (and most other git operations) a lot faster.

The work on 4.0 was done by a tiny number of people who continue working on it, unpaid, because they care about it. Please help!

API and Internal Changes

As with all releases, we'll do everything possible to avoid breaking API. However, there will still be tweaks that have to be made. We'll try to keep them minor. Our goal is stability, and keeping everyone's code running.

The full list of changes can be seen in the release notes for each version. The list below only covers changes for developers working on this repository, or that may have an impact on Library, Mode, or Tool development.

Beta 9

  • Major changes to themes and some libraries too. Also changed the default branch. If you have an older checkout, do this:

    git pull
    git checkout main
    ant clean
    ant clean-libs
    ant run

    …or just do a fresh git clone and pull down the latest.

  • Apple Silicon support should be complete, as far as we know. If you find otherwise, file an issue.

  • Check out the long revisions update for this one. Too much to cover here.

  • Now using Java 17.0.4+8 from Adoptium.

Beta 8

  • Renamed the Add Mode, Add Library, and Add Tool menu items to Manage Modes, Manage Libraries, and Manage Tools. This will require translation updates for the new text:
    • toolbar.add_mode = Add Mode... has been replaced with toolbar.manage_modes = Manage Modes…
    • menu.library.add_library = Add = Manage Libraries…
    • = Add = Manage Tools…

Beta 6

  • Major rewrite of handleOpen(), now possible to use something besides the folder name for the main sketch file (see for details).

  • Now using Java 17.0.2+8 from Adoptium.

Beta 3

  • Now using JDK 17.0.1 and JavaFX 17.0.1.

  • Major changes to theme.txt and theme handling in general. Now rendering toolbar icons from SVG images. More documentation later.

  • Made DrawListener public in PSurfaceJOGL.

Beta 2

  • Added a workaround so that color can be part of package names, which gets some older code (i.e. toxiclibs) running again.

Beta 1

  • Now using JDK 11.0.12+7.

Alpha 6

  • Editor.applyPreferences() was protected, now it's public.

  • Removed Editor.repaintErrorBar() and Editor.showConsole(). Does not appear to be in use anywhere, easy to add back if we hear otherwise.

  • Renamed TextAreaPainter.getCompositionTextpainter() to getCompositionTextPainter(). This was an internal function and inconsistent with the rest of the function naming.

Alpha 5

  • Known bug: code completion is currently broken. Any updates will be posted here. Fixed in alpha 6.

  • Moved from the 11.0.2 LTS version of JavaFX to the in-progress version 16. This fixes a garbled text issue that was breaking Tools that used JavaFX.

  • The minimum system version for macOS (for the PDE and exported applications) is now set to 10.14.6 (the last update of Mojave). 10.13 (High Sierra) is no longer supported by Apple as of September or December 2020 (depending on what you read), and for our sanity, we're dropping it as well.

  • JavaFX has been moved out of core and into a separate library. After Java 8, it's no longer part of the JDK, so it requires additional files that were formerly included by default. The Processing version of that library comes in at 180 MB, which seems excessive to include with every project, regardless of whether it's used. (And that's not including the full Webkit implementation, which adds ~80 MB per platform.)

Alpha 4

  • EditorState(List<Editor> editors) changed to EditorState.nextEditor(List<Editor> editors), reflecting its nature as closer to a factory method (that makes use of the Editor list) than a constructor that will also be storing information about the list of Editor objects in the created object.

Alpha 3

  • export.embed_java.for changed to export.include_java which also embeds a string for the platform for better localization support.

Alpha 2

  • The minimum system version for macOS (for the PDE and exported applications) is now set to 10.13.6 (the last update of High Sierra). Apple will likely be dropping support for High Sierra in late 2020, so we may make the minimum 10.14.x by the time 4.x ships.

  • See if you're using surface.setResizable() with this release on macOS and with P2D or P3D renderers.

  • The static versions of selectInput(), selectOutput(), and selectFolder() in PApplet have been removed. These were not documented, hopefully they were not in use anyway.

  • The frame object has been removed from PApplet. We've been warning folks to use surface since 2015, but maybe we can provide an easy way to update code from inside the PDE.

  • PImage.checkAlpha() is now public instead of protected

  • All AWT calls have been moved out of PImage, which may be a problem for anything that was relying on those internals

    • For instance, new PImage(java.awt.Image) is no longer available. It was an undocumented method that was public only because it was required by subclasses. As of alpha 4, this is back, because it wasn't deprecated in 3.x, and is likely to break too many things.
  • Removed MouseEvent.getClickCount() and MouseEvent.getAmount(). These had been deprecated, not clear they were used anywhere.

Alpha 1

  • Base.defaultFileMenu is now protected instead of static public

  • Processing 4 is 64-bit only. This is the overwhelming majority of users, and we don't have the necessary help to maintain and support 32-bit systems.