Package com.shyarnis.topsort.utils

Class GraphVisualizer

java.lang.Object

com.shyarnis.topsort.utils.GraphVisualizer

public class GraphVisualizer
extends Object

Utility class for visualizing directed graphs in GraphViz DOT format and rendering them to PNG.

This class provides static methods to:

• Convert a graph to DOT format representing the original edges
• Convert a topologically sorted list of nodes to a chained DOT graph
• Render DOT files to PNG using the external GraphViz tool

Method Summary

Modifier and Type	Method	Description
static void	renderDotToPng(String dotPath, String pngPath)	Renders a GraphViz DOT file to a PNG image using the GraphViz CLI tool.
static <T> void	visualizeOriginalGraph(Graph<T> graph, String dotPath)	Generates a GraphViz DOT representation of the original directed graph.
static <T> void	visualizeSortedGraph(List<T> sortedOrder, String dotPath)	Generates a GraphViz DOT representation of a topologically sorted list of nodes, displaying them as a simple directed chain.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

visualizeOriginalGraph

public static <T> void visualizeOriginalGraph(Graph<T> graph,
 String dotPath)
                                       throws IOException

Generates a GraphViz DOT representation of the original directed graph.

Type Parameters:

T - the type of node in the graph

Parameters:

graph - the directed graph to visualize

dotPath - the output path for the generated DOT file

Throws:

IOException - if the DOT file cannot be written

visualizeSortedGraph

public static <T> void visualizeSortedGraph(List<T> sortedOrder,
 String dotPath)
                                     throws IOException

Generates a GraphViz DOT representation of a topologically sorted list of nodes, displaying them as a simple directed chain.

Type Parameters:

T - the type of node

Parameters:

sortedOrder - the list of nodes in topological order

dotPath - the output path for the generated DOT file

Throws:

IOException - if the DOT file cannot be written

renderDotToPng

public static void renderDotToPng(String dotPath,
 String pngPath)
                           throws IOException,
InterruptedException

Renders a GraphViz DOT file to a PNG image using the GraphViz CLI tool.

Requires the dot command to be installed and available in the system path.

Parameters:

dotPath - the path to the input DOT file

pngPath - the path to the output PNG file

Throws:

IOException - if the external process cannot be started

InterruptedException - if the rendering process is interrupted

RuntimeException - if GraphViz fails to render the image