更改邊緣的顏色

Question

我有一個由邊和頂點組成的圖。當點擊圖中的一條邊時，邊應該改變顏色。我已經包含了一些代碼示例來演示我的問題。

繪製初始圖形;

#include "StdAfx.h" 
#include <vtkSmartPointer.h> 
#include <vtkCallbackCommand.h> 
#include <vtkAnnotationLink.h> 
#include <vtkRenderedGraphRepresentation.h> 
#include <vtkRenderer.h> 
#include <vtkDoubleArray.h> 
#include <vtkSelectionNode.h> 
#include <vtkIdTypeArray.h> 
#include <vtkSelection.h> 
#include <vtkRenderWindow.h> 
#include <vtkUnsignedCharArray.h> 
#include <vtkObjectFactory.h> 
#include <vtkGraphLayoutStrategy.h> 
#include <vtkGraphLayoutView.h> 
#include <vtkGraphWriter.h> 
#include <vtkMutableUndirectedGraph.h> 
#include <vtkRenderWindowInteractor.h> 

#include <vtkIntArray.h> 
#include <vtkLookupTable.h> 
#include <vtkDataSetAttributes.h> 
#include <vtkViewTheme.h> 

void SelectionCallbackFunction(vtkObject* caller, long unsigned int eventId, void* clientData, void* callData); 
vtkSmartPointer<vtkMutableUndirectedGraph> g; 
int main(int, char *[]) 
{ 
    g = 
     vtkSmartPointer<vtkMutableUndirectedGraph>::New(); 

    vtkIdType v1 = g->AddVertex(); 
    vtkIdType v2 = g->AddVertex(); 

    g->AddEdge(v1, v2); 
    g->AddEdge(v1, v2); 


    vtkSmartPointer<vtkCallbackCommand> selectionCallback = 
     vtkSmartPointer<vtkCallbackCommand>::New(); 
    selectionCallback->SetCallback (SelectionCallbackFunction); 

    // Create the color array 
    vtkSmartPointer<vtkIntArray> edgeColors = 
     vtkSmartPointer<vtkIntArray>::New(); 
    edgeColors->SetNumberOfComponents(1); 
    edgeColors->SetName("Color"); 

    vtkSmartPointer<vtkLookupTable> lookupTable = 
     vtkSmartPointer<vtkLookupTable>::New(); 
    lookupTable->SetNumberOfTableValues(1); 
    lookupTable->SetTableValue(0, 1.0, 0.0, 0.0); // red 
    lookupTable->Build(); 

    edgeColors->InsertNextValue(0); 

    // Add the color array to the graph 
    g->GetEdgeData()->AddArray(edgeColors); 

    vtkSmartPointer<vtkGraphLayoutView> view = 
     vtkSmartPointer<vtkGraphLayoutView>::New(); 

    view->SetEdgeColorArrayName("Color"); 
    view->ColorEdgesOn(); 

    vtkSmartPointer<vtkViewTheme> theme = 
     vtkSmartPointer<vtkViewTheme>::New(); 
    theme->SetCellLookupTable(lookupTable); 

    view->ApplyViewTheme(theme); 

    view->AddRepresentationFromInput(g); 
    view->SetLayoutStrategy("Simple 2D"); 
    view->GetRepresentation()->GetAnnotationLink()->AddObserver("AnnotationChangedEvent", selectionCallback); 

    view->ResetCamera(); 
    view->Render(); 

    view->GetInteractor()->Start(); 

    return EXIT_SUCCESS; 
} 

對於鼠標點擊功能，我使用了下面的代碼;

vtkAnnotationLink* annotationLink = 
     static_cast<vtkAnnotationLink*>(caller); 

    vtkSelection* selection = annotationLink->GetCurrentSelection(); 
    vtkSelectionNode* edges; 

    if(selection->GetNode(0)->GetFieldType() == vtkSelectionNode::EDGE) 
    { 
     edges = selection->GetNode(0); 
    } 

    if(selection->GetNode(1)->GetFieldType() == vtkSelectionNode::EDGE) 
    { 
     edges = selection->GetNode(1); 
    } 

    vtkIdTypeArray* edgeList = vtkIdTypeArray::SafeDownCast(edges->GetSelectionList()); 
    for(vtkIdType i = 0; i < edgeList->GetNumberOfTuples(); i++) 
    { 
     //Change colour of the edge 
    } 

我的問題是，我不能動態地改變邊緣的顏色。我將非常感謝有關此事的任何幫助。

Answer 1

以下代碼適用於我。首先，當我創建圖形我設置的每一個邊緣的顏色，

edgeColors = vtkSmartPointer<vtkIntArray>::New(); 
    edgeColors->SetNumberOfComponents(1); 
    edgeColors->SetName("Color"); 

    vtkSmartPointer<vtkLookupTable> lookupTable = 
     vtkSmartPointer<vtkLookupTable>::New(); 
    lookupTable->SetNumberOfTableValues(2); 
    lookupTable->SetTableValue(0, 0.5, 1.0, 0.5); // green 
    lookupTable->SetTableValue(1, 0.0, 1.0, 0.0); // white 

    lookupTable->Build(); 

    //For each edge id insert colour 
    for(int i = 0;i<=graph->GetNumberOfEdges();i++) 
     edgeColors->InsertValue(i,0); 


    // Add the color array to the graph 
    graph->GetEdgeData()->AddArray(edgeColors); 

然後在我的鼠標點擊功能我得到的點擊邊緣的vtkIdType並設置它的顏色。

vtkIdType edge = edgeList->GetValue(0); 
    edgeColors->InsertValue(edge.Id,1);//set colour of edge 
    graphLayoutView->GetInteractor()->Render();