dot-gen.hpp File Reference

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Description

Support for generation of Graphviz-DOT code for structure visualisation.

The dot language offers a simple notation to represent structural information as diagrams of abstract graphs and networks. The Graphviz layout programs translate these into automatically arranged diagrams graphs, relying on basic layout schemes like directed and undirected graphs, force-directed placement, radial arrangements, clustered graphs or squarified treemap layout. These visualisations can be rendered as images, vector graphic SVG or PDF and a lot of further formats.

The namespace lib::dot_gen contains a set of integrated builder DSL functions to simplify the task of syntax generation; notable it is possible to set up several sections, which can then be gradually populated with definition clauses while traversing a data structure.

Todo:

11/2023 this is an initial draft, shaped by the immediate need to visualise random generated computation patterns for Scheduler load testing. The abstraction level of this DSL is low and structures closely match some clauses of the DOT language; this approach may not yet be adequate to generate more complex graph structures and was extracted as a starting point for further refinements.

The top-level entrance point is lib::dot_get::digraph(), allowing to combine a series of lib::dot_gen::Section definitions into a DOT script, which can then be retrieved by string conversion (or sent to standard output)

• Section is an accumulator of lines with DOT language specs
• Code is a string with syntax, used as base for some pre-configured terms
• Node defines a variable name, but can be augmented with attributes to build a node-statement
• Scope is meant as a device to group several nodes together, typically to form a cluster or stratum in the generated layout

See also

TestChainLoad_test

SchedulerStress_test

Definition in file dot-gen.hpp.

#include "lib/format-util.hpp"
#include "lib/util.hpp"
#include <utility>
#include <sstream>
#include <string>
#include <vector>

Classes
struct	Code
	markup to generate a piece of code More...
class	DotOut
	Helper to collect DOT-Graphviz code for output. More...
struct	Node
	generate a Node name or a node_statement defining attributes of that node. More...
struct	Scope
	accumulator to collect nodes grouped into a scope More...
struct	Section
	Accumulator to collect lines of DOT code. More...

Functions
Code	connect (size_t src, size_t dest)
	generate a directed node connectivity clause
template<class... COD>
DotOut	digraph (COD ...parts)
	Entrance-point: generate a graph spec in DOT-Language. More...
Node	node (size_t id)
Scope	scope (size_t id)

Namespaces
	lib
	Implementation namespace for support and library code.

Function Documentation

digraph()

DotOut lib::dot_gen::digraph ( COD ...  parts )

inline

Entrance-point: generate a graph spec in DOT-Language.

Parameters

parts

a sequence of Section or Code objects to be combined and rendered

Returns

DotOut object holding the script rendered into a stringstream-buffer

Definition at line 237 of file dot-gen.hpp.

References lib::dot_gen::digraph().

Referenced by lib::dot_gen::digraph().

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