__attribute__((used)) char* vizRenderFromString(const char *string, const char *format, const char *engine) {
Agraph_t *graph;
char *result;
unsigned int length;
if (context == NULL) {
context = gvContext();
gvAddLibrary(context, &gvplugin_core_LTX_library);
gvAddLibrary(context, &gvplugin_dot_layout_LTX_library);
gvAddLibrary(context, &gvplugin_neato_layout_LTX_library);
}
graph = agmemread((char *) string);
gvLayout(context, graph, engine);
gvRenderData(context, graph, format, &result, &length);
gvFreeLayout(context, graph);
agclose(graph);
return result;
}
// render to a malloc'ed data string, to be free'd by caller.
char* renderdata(Agraph_t *g, const char *format)
{
int err;
char *data;
unsigned int length;
if (!g)
return NULL;
err = gvRenderData(gvc, g, format, &data, &length);
if (err)
return NULL;
data = (char*)realloc(data, length + 1);
return data;
}
static bool GenDrawFormatFile(Digraph& dg, VNG_Param& param, const string& fmt, char** result, unsigned int* length)
{
GVC_t* gvc = gvContext();
//创建图
Agraph_t* g = CreateGraph(dg, param);
gvLayout(gvc,g,"dot");
//写入到缓存数组中
gvRenderData(gvc,g,fmt.c_str(), result, length);
//gvFreeRenderData(result);
gvFreeLayout(gvc,g);
agclose(g);
// gvfreecontext函数返回错误个数
// 错误数为0表示没有问题
return (gvFreeContext(gvc) == 0);
}
GraphVizUtils::VerticesCoordinates GraphVizUtils::getVerticesCoordinates(
GraphIF * graph, GraphVizEngine layoutEngine,
GraphDimmention graphMaxWidth, GraphDimmention graphMaxHeight) {
GVC_t *gvc { };
Agraph_t *g { };
std::string dotFormatedGraph { };
char * graphRenderedData { };
unsigned int length { };
VerticesCoordinates verticesCoordinates { };
std::stringstream ss { };
gvc = gvContext();
dotFormatedGraph = OutputUtils::impl::DOT::exportGraph(graph);
g = agmemread(dotFormatedGraph.c_str());
gvLayout(gvc, g, EnumUtils::getGraphVizEngineString(layoutEngine));
gvRenderData(gvc, g, "plain", &graphRenderedData, &length);
ss << graphRenderedData;
switch (layoutEngine) {
case GraphVizEngine::DOT:
break;
case GraphVizEngine::NEATO:
verticesCoordinates =
GraphVizUtils::impl::getVerticesCoordinatesAsNeato(ss,
graph->getNumberOfVertices(), graphMaxWidth,
graphMaxHeight);
break;
default:
break;
}
gvFreeRenderData(graphRenderedData);
gvFreeLayout(gvc, g);
agclose(g);
gvFreeContext(gvc);
return verticesCoordinates;
}
__attribute__((used)) char* vizRenderFromString(char *string, char *format) {
GVC_t *context = gvContext();
gvAddLibrary(context, &gvplugin_core_LTX_library);
gvAddLibrary(context, &gvplugin_dot_layout_LTX_library);
Agraph_t *graph = agmemread(string);
gvLayout(context, graph, "dot");
char *result;
unsigned int length;
gvRenderData(context, graph, format, &result, &length);
gvFreeLayout(context, graph);
agclose(graph);
gvFinalize(context);
gvFreeContext(context);
return result;
}
