<｜begin▁of▁sentence｜>### Instruction:
As a game developer, you're tasked with creating immersive worlds and captivating gameplay experiences. Let's say you're working on a new game that involves navigating through intricate networks within the game environment. To enhance player understanding of directionality within these networks, you decide to utilize the DarkToLightEdgeDrawer class from igraph, which allows you to visually represent the direction of edges with a gradient. The graph data for these networks can be read from a file called 'graph19.gml'. Now, the challenge lies in implementing this functionality to create visually appealing and informative network representations for your game.
### Response:
import igraph as ig
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