/// <summary>
/// Initializes the GraphViz renderer
/// </summary>
/// <param name="graphVizInstallPath">GraphViz install path</param>
private void Initialize(string graphVizInstallPath)
{
GraphVizCore.AddEnvironmentPaths(graphVizInstallPath);
GVContext = GraphVizCore.gvContext();
LayoutEngine = GV_DEFAULT_LAYOUT;
}
/// <summary>
/// Free the layout
/// </summary>
protected void FreeLayout()
{
if (GraphVizCore.gvFreeLayout(GVContext, GVGraph) != 0)
{
throw new Exception("Error while freeing the layout");
}
}
/// <summary>
/// Sets the layout that will be used to render the graph
/// </summary>
/// <param name="layout">Layout engine name</param>
protected void SetLayout(string layout)
{
if (GraphVizCore.gvLayout(GVContext, GVGraph, layout) != 0)
{
throw new ArgumentException("Error while setting layout to \"" + layout + "\"");
}
}
/// <summary>
/// Creates a graph from the given code
/// </summary>
/// <param name="dotGraphCode">GraphViz code</param>
public void CreateGraph(String dotGraphCode)
{
// Create the graph from the string
GVGraph = GraphVizCore.agmemread(dotGraphCode);
// Did it succeed
if (GVGraph == IntPtr.Zero)
{
throw new InvalidDataException("Unable to read the given data string");
}
}
/// <summary>
/// Constructs a GraphVizRenderer by trying to automatically find the GraphViz install path
/// </summary>
public GraphVizRenderer()
{
// Get the install path
string graphVizInstallPath = GraphVizCore.GetGraphVizPath();
// If path has been found
if (graphVizInstallPath != "")
{
Initialize(graphVizInstallPath);
}
else
{
throw new DirectoryNotFoundException("Unable to automatically find GraphViz install path. Use Graph constructor with explicit path instead, or check GraphViz is installed on your computer.");
}
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (!disposed)
{
if (disposing)
{
}
// Free the stream
GraphVizCore.gvFreeRenderData(_pointer);
disposed = true;
}
}
protected virtual void Dispose(bool disposing)
{
if (!disposed)
{
if (disposing)
{
// Release managed resources
}
// Release unmanaged resources
GraphVizCore.agclose(GVGraph);
GraphVizCore.gvFreeContext(GVContext);
disposed = true;
}
}
/// <summary>
/// Renders a graph to a data stream
/// </summary>
/// <param name="gvContext">A GraphViz context pointer</param>
/// <param name="gvGraph">A GraphViz graph pointer</param>
/// <param name="format">The GraphViz renderer format string</param>
/// <returns>The stream representing the rendered graph</returns>
protected static GraphVizRenderStream Render(IntPtr gvContext, IntPtr gvGraph, string format)
{
unsafe
{
byte *result;
uint length;
// Render the graph to a byte stream
if (GraphVizCore.gvRenderData(gvContext, gvGraph, format, out result, out length) != 0)
{
throw new InvalidDataException("GraphViz gvRenderData function return empty pointer");
}
// Turn the byte stream to a "managed" stream
return(new GraphVizRenderStream(result, length));
}
}
