private boolean isInDirection() {
		FcgLevel level = vertex.getLevel();
		FcgDirection direction = level.getDirection();
		boolean isIn = direction.isIn() || direction.isSource();
		return isIn;
	}
A vertex shape provider for the {@link FunctionCallGraphPlugin}.
Ghidra/Features/GraphFunctionCalls/src/main/java/functioncalls/graph/FcgVertexShapeProvider.java