public VertexShape getVertexShape(String vertexType) {
		return vertexShapeMap.getOrDefault(vertexType, defaultVertexShape);
	}
Returns the {@link VertexShape} for vertices that have the given vertex type
@param vertexType the vertex type for which to get its asigned shape
@return the {@link VertexShape} for vertices that have the given vertex type
Ghidra/Framework/Graph/src/main/java/ghidra/service/graph/GraphDisplayOptions.java