我有一个由边和顶点组成的图。当点击图表中的边缘时,边缘应该改变颜色。我已经包含了一些代码示例来演示我的问题。
绘制初始图形;
#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;
}
对于鼠标点击功能,我使用了以下代码;
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
}
我的问题是我无法动态改变边缘的颜色。我非常感谢有关此事的任何帮助。
答案 0 :(得分:1)
以下代码对我有用。首先,当我创建图形时,我设置每个边缘的颜色,
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);
然后在我的鼠标点击功能中,我获得了点击边缘的vtkIdType并设置了它的颜色。
vtkIdType edge = edgeList->GetValue(0);
edgeColors->InsertValue(edge.Id,1);//set colour of edge
graphLayoutView->GetInteractor()->Render();