vtk9.2如何设置vtkaxisactor主刻度和次刻度

对于vtkAxisActor，您可以使用vtkScalarBarActor来设置主刻度和次刻度。具体的代码实现可以参考以下示例代码：

#include <vtkScalarBarActor.h>
#include <vtkSmartPointer.h>
#include <vtkAxisActor.h>

int main(int, char*[])
{
  vtkSmartPointer<vtkScalarBarActor> scalarBarActor = vtkSmartPointer<vtkScalarBarActor>::New();
  scalarBarActor->SetMaximumNumberOfColors(256);
  scalarBarActor->SetDrawAnnotations(true);
  
  vtkSmartPointer<vtkAxisActor> axisActor = vtkSmartPointer<vtkAxisActor>::New();
  axisActor->SetPoint1(0,0,0);
  axisActor->SetPoint2(1,0,0);
  axisActor->SetNumberOfLabels(10);
  axisActor->SetLabelFormat("%.1f");
  axisActor->SetTickLength(0.02);
  axisActor->SetTitle("Title");
  axisActor->GetTitleTextProperty()->SetColor(1.0,0.0,0.0);
  axisActor->GetLabelTextProperty()->SetColor(0.0,1.0,0.0);
  axisActor->SetIntersectionLineWidth(3);
  axisActor->SetMainScale(2.0);
  axisActor->GetLabelTextProperty()->SetFontSize(16);
  
  return EXIT_SUCCESS;
}

其中，SetNumberOfLabels可用于设置主刻度的数量，SetLabelFormat可以指定标签的格式，SetTickLength可用于指定刻度线的长度，SetTitle可以设置坐标轴的标题，GetTitleTextProperty和GetLabelTextProperty分别用于获取标题和刻度标签的属性对象，SetMainScale可以用于调整刻度线的主刻度长度。