Master the visual output of a simple digraph. Master to design arrow arcs of the digraph with JavaFX. Import the adjacency matrix of a simple digraph. Output the graph with JavaFX and the graphic user interface. Draw the arrows of the digraph base on the line object of JavaFX. (1) open ECLIPSE IDE （2）build Java project in the workspace （3）import the JavaFX toolkit

Sure, I understand your question. You want to know how to master the visual output of a simple digraph and design arrow arcs with JavaFX. You also want to import the adjacency matrix of the digraph and output the graph with JavaFX and a graphic user interface. Finally, you want to draw the arrows of the digraph based on the line object of JavaFX.

To achieve this, you can follow these steps:

1. Open ECLIPSE IDE and create a new Java project in the workspace.

2. Import the JavaFX toolkit into your project. You can do this by adding the JavaFX SDK to your project's build path.

3. Create a class to represent the digraph. You can use an adjacency matrix to represent the graph.

4. Use JavaFX to create a graphical user interface that displays the digraph. You can create a canvas and draw the graph on it.

5. Use JavaFX's line object to draw the arrows of the digraph. You can calculate the position of each arrow based on the position of the nodes and the direction of the edges.

By following these steps, you should be able to master the visual output of a simple digraph with JavaFX and design arrow arcs based on the line object.