@Override
	public void optionsChanged(ToolOptions options, String optionName, Object oldValue,
			Object newValue) {
		if (optionName.equals(OptionsGui.BACKGROUND.getColorOptionName())) {
			Color c = (Color) newValue;
			flowArrowPanel.setBackground(c);
		}
		else if (optionName.equals(OptionsGui.FLOW_ARROW_NON_ACTIVE.getColorOptionName())) {
			Color c = (Color) newValue;
			flowArrowPanel.setForeground(c);
		}
		else if (optionName.equals(OptionsGui.FLOW_ARROW_ACTIVE.getColorOptionName())) {
			Color c = (Color) newValue;
			flowArrowPanel.setHighlightColor(c);
		}
	}
Those arrows that start at the current address
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/flowarrow/FlowArrowPlugin.java