Accumulator (Flowgraph Node)

Overview

• Node Name: Accumulator
• Category: repeat_instant
• File: extensions/flowgraph/nodes/math/accumulator.lua

Adds together values whenever triggered. Maintains a running sum that can be reset back to a default value.

Pin Schema

Input Pins

Output Pins

Internals

How It Works

1. On execution start, currentSum is set to resetValue and output is updated.
2. Each frame, if reset is triggered, the sum resets to resetValue (reset has priority over add).
3. If add is triggered, the input value (or 1 if nil) is added to the sum, and changed fires.
4. On execution stop or deserialization, currentSum resets to resetValue.

The node displays the current sum in its middle area via ImGui.

Lua Example

-- Flowgraph usage: counting laps
-- Connect a trigger zone's "entered" flow → add pin
-- value pin = 1 (default)
-- result pin → UI display showing lap count
-- reset flow → connected to race restart

Key Dependencies

• ui_imgui - for rendering the current value in the node editor
• _flowgraph_createNode() - standard flowgraph node registration

Additional Methods

C:_executionStarted()

Called when graph execution starts. Used for initialization/reset.

C:_executionStopped()

Called when graph execution stops. Used for cleanup.

C:_onDeserialized()

Called after the node is deserialized (loaded from file). Restores runtime state from saved data.

C:drawMiddle(builder, style)

Custom ImGui drawing in the middle section of the node in the editor.

Parameters:

• builder
• style

C:init()

Initializes the node, setting up pins and default properties.

C:work()

Main work function called each frame/tick when the node is active.

See Also

• Ease (Flowgraph Node) - Related reference
• Increaser (Flowgraph Node) - Related reference
• Expression (Flowgraph Node) - Related reference
• FlowGraph Guide - Guide