Site and download links: https://ra4king.github.io/CircuitSim

Basic circuit simulator with many built-in components. Check out src/com/ra4king/circuitsim/simulator/components for examples of how Components are written. Their GUI counterparts are in src/com/ra4king/circuitsim/gui/peers.

Screenshot

The gradle script produces a multi-release jar to resolve incompatibilities between JavaFX 8 and 9, so you need to install both Java 8 and Java 9 to build. For example:

$ export JAVA_8_HOME=/usr/lib/jvm/java-8-openjdk-amd64/
$ export JAVA_9_HOME=/usr/lib/jvm/java-9-openjdk-amd64/
$ ./gradlew jar

It is recommended to run with JVM option -Xmx250M to limit the heap size to 250MB.

• Significant performance and memory usage improvements
• Holding CTRL will keep a component selected after placing it
• Circuit file generation is now deterministic
• Fix subcircuit pin count mismatch errors
• Fix display of Output pin, where it used to be printed as Input pin
• Fix saving ROM contents after being broken in 1.8.0
• (Breaking change) Fix subcircuit pin ordering on the east and west side by sorting by Y instead of X

• Revamp ROM/RAM component look: now showing the current address and value
• Revamp ROM/RAM memory editor: no need to double click to start typing, no need to hit enter to commit, full multi-cell copy/paste support
• Huge improvement and bug-fixes to wire behavior when moving components and with undo/redo
• Add RandomGenerator component
• Add copy/cut/paste to context menu in circuit editor
• Display missing label names in certain components
• Add All Files option in Load File dialog
• Fixed bug with gates where downsizing the number of inputs kept the extra Negate options

• Fix several bugs with wire creation when dragging components
• Give an option to send an error report upon unexpected errors
• Minor bug fixes

• Fix blue wire issues with Tunnels and subcircuits
• Highlight wires when clicking on them
• Ctrl+scroll now zooms in/out
• Right clicking when placing components or dragging wires cancels the action
• Fix bug with intersecting wires being auto-joined on drag
• Improved error handling

• Add Probe component, which lets you observe values on wires without resorting to output pins
• Improve behavior multi-component selection when holding down control by disabling drag-less wire creation when control is held down
• Copy doesn't do anything when nothing is selected instead of emptying the clipboard
• Other minor bugs fixed

• Squashed tunnel bugs: now short-circuits should propagate properly across them and tunnels should work properly
• Added comparison type to Comparator: now you can do both 2's complement and unsigned comparison
• Draw magnifying glass to subcircuit components when hovering over them to indicate ability to view internal state
• Officially making a file format change supporting library paths
• Other minor bugs fixed

• Big thanks to Cem Gokmen for helping with the Mac issues and Austin Adams for gradle-ifying the repo!
• Now supporting both Java 8 and 9 - thanks to Austin Adams for figuring out how to create a multi-release Jar.
• Huge rendering performance improvements, especially for Mac
• Fixed keyboard shortcut issue on Mac
• Use system menu bar on Mac instead of the in-app bar
• Added an update checker that notifies you when there is a new version
• Fixed a bug with subcircuits where it pushed values through output pins, causing seemingly un-explainable short circuits.
• Improved behavior of tab selection when moving them or deleting them, especially with undo/redo
• Many minor bug fixes and improvements

• Fixed exceptions being thrown when using Tunnels
• Now you don't have hit enter to update a text or value property, someone complained that it was annoying. The component is automatically updated when you unfocus from the text input.
• Multi-bit wires with a floating bit (X) now show up as dark blue instead of black
• Button now has directions

• Improved behavior when dragging components to also delete wires whenever they overlap existing ones
• Huge performance increases with subcircuits and tunnels. Bad designs will still be very slow to run the autograder in.
• Now showing Help dialog on first run.

• Added creation of new wires when dragging components. This allows maintaining existing connections when dragging components to new locations.
• Hold CTRL before beginning the drag to disable this.
• Fixed file load issue where an error was thrown if the folder doesn't exist anymore.
• Fixed issues with dragging + keyboard shortcuts
• Fixed an undo bug when updating components