一.需求

实现一个可移动，可旋转的三位坐标轴。

二，步骤

1.继承 vtkAbstractWidget。将鼠标事件传递给 vtkWidgetRepresentation。

2.继承 vtkWidgetRepresentation 。实现控件长什么样子，三个轴，三个圈。怎么交互，操纵轴，操纵圈该怎么动。

三，实现

1，绘制轴和圈

vtkMovableAxesRepresentation::vtkMovableAxesRepresentation()
{// The initial statethis->InteractionState = vtkMovableAxesRepresentation::Outside;// Handle size is in pixels for this widgetthis->HandleSize = 5.0;// Control orientation of normalsthis->InsideOut = 0;// Set up the initial propertiesthis->CreateDefaultProperties();// Define the point coordinatesdouble bounds[6];bounds[0] = -0.5;bounds[1] = 0.5;bounds[2] = -0.5;bounds[3] = 0.5;bounds[4] = -0.5;bounds[5] = 0.5;// Points 8-14 are down by PositionHandles();this->BoundingBox = vtkBox::New();this->PlaceWidget(bounds);//画 圆this->AxisCircel = new vtkActor* [3];this->AxisPolygonSource = new vtkRegularPolygonSource* [3];this->AxisCircleMapper = new vtkPolyDataMapper*[3];for(auto i=0;i<3;i++){this->AxisCircel[i]=vtkActor::New();this->AxisPolygonSource[i] = vtkRegularPolygonSource::New();this->AxisCircleMapper[i] = vtkPolyDataMapper::New();this->AxisPolygonSource[i]->SetNumberOfSides(100);    //多边形边数this->AxisPolygonSource[i]->SetRadius(g_circleRadius);       //半径this->AxisPolygonSource[i]->SetCenter(0, 0, 0);      //圆心this->AxisCircleMapper[i]->SetInputConnection(this->AxisPolygonSource[i]->GetOutputPort());this->AxisCircel[i]->SetMapper(this->AxisCircleMapper[i]);this->AxisCircel[i]->GetProperty()->SetOpacity(1);    //透明度this->AxisCircel[i]->GetProperty()->SetLineWidth(g_circleLineWidth);this->AxisCircel[i]->GetProperty()->SetRepresentationToWireframe();//图形不填充，只要边框this->AxisCircel[i]->GetProperty()->SetColor(g_normalColor[i][0],g_normalColor[i][1],g_normalColor[i][2]);    //颜色vtkNew<vtkMatrix4x4> initMatrix;this->AxisCircel[i]->SetUserMatrix(initMatrix);}//圆形拾取this->CircelPicker = vtkCellPicker::New();this->CircelPicker->SetTolerance(0.001);for(int i=0;i<3;i++){this->CircelPicker->AddPickList(this->AxisCircel[i]);}this->CircelPicker->PickFromListOn();this->CurrentCircel=nullptr;//轴this->HandleAxis = new vtkAssembly* [3];for (int i=0; i<3; i++){vtkNew<vtkLineSource> lineSource;vtkNew<vtkPolyDataMapper> lineMapper;vtkNew<vtkActor> lineActor;lineMapper->SetInputConnection(lineSource->GetOutputPort());lineActor->SetMapper(lineMapper);double point1[3];double point2[3];if(i==0){//x轴point1[0]=-g_axisLength;point1[1]=0;point1[2]=0;point2[0]=g_axisLength;point2[1]=0;point2[2]=0;}else if(i==1){//y轴point1[0]=0;point1[1]=-g_axisLength;point1[2]=0;point2[0]=0;point2[1]=g_axisLength;point2[2]=0;}else if(i==2){//z轴point1[0]=0;point1[1]=0;point1[2]=-g_axisLength;point2[0]=0;point2[1]=0;point2[2]=g_axisLength;}lineSource->SetPoint1(point1);lineSource->SetPoint2(point2);lineActor->GetProperty()->SetColor(g_normalColor[i][0],g_normalColor[i][1],g_normalColor[i][2]);lineActor->GetProperty()->SetLineWidth(g_axisLineWidth);//箭头vtkNew<vtkConeSource> coneSource1;vtkNew<vtkPolyDataMapper> coneMapper1;vtkNew<vtkActor> coneActor1;coneSource1->SetHeight( 0.2 );coneSource1->SetRadius( 0.04 );coneSource1->SetResolution( 10 );coneMapper1->SetInputConnection(coneSource1->GetOutputPort());coneActor1->SetMapper(coneMapper1);coneActor1->GetProperty()->SetColor(g_normalColor[i][0],g_normalColor[i][1],g_normalColor[i][2]);coneSource1->SetCenter(point2);if(i==0){//x轴}else if(i==1){//y轴coneActor1->SetOrigin(point2);coneActor1->RotateZ(90);}else if(i==2){//z轴coneActor1->SetOrigin(point2);coneActor1->RotateY(-90);}//vtkNew<vtkConeSource> coneSource2;vtkNew<vtkPolyDataMapper> coneMapper2;vtkNew<vtkActor> coneActor2;coneSource2->SetHeight( 0.2 );coneSource2->SetRadius( 0.04 );coneSource2->SetResolution( 30 );coneMapper2->SetInputConnection(coneSource2->GetOutputPort());coneActor2->SetMapper(coneMapper2);coneActor2->GetProperty()->SetColor(g_normalColor[i][0],g_normalColor[i][1],g_normalColor[i][2]);coneSource2->SetCenter(point1);if(i==0){//x轴coneActor2->SetOrigin(point1);coneActor2->RotateY(180);this->AxisPolygonSource[i]->SetNormal(1,0,0);}else if(i==1){//y轴coneActor2->SetOrigin(point1);coneActor2->RotateZ(-90);this->AxisPolygonSource[i]->SetNormal(0,1,0);}else if(i==2){//z轴coneActor2->SetOrigin(point1);coneActor2->RotateY(90);this->AxisPolygonSource[i]->SetNormal(0,0,1);}this->HandleAxis[i] = vtkAssembly::New();this->HandleAxis[i]->AddPart(lineActor);this->HandleAxis[i]->AddPart(coneActor1);this->HandleAxis[i]->AddPart(coneActor2);vtkNew<vtkMatrix4x4> initMatrix;this->HandleAxis[i]->SetUserMatrix(initMatrix);}//坐标轴拾取this->AxisPicker = vtkCellPicker::New();this->AxisPicker->SetTolerance(0.001);for (int i=0; i<3; i++){this->AxisPicker->AddPickList(this->HandleAxis[i]);}this->AxisPicker->PickFromListOn();//// Internal data members for performancethis->Transform = vtkTransform::New();this->PlanePoints = vtkPoints::New(VTK_DOUBLE);this->PlanePoints->SetNumberOfPoints(6);this->PlaneNormals = vtkDoubleArray::New();this->PlaneNormals->SetNumberOfComponents(3);this->PlaneNormals->SetNumberOfTuples(6);this->Matrix = vtkMatrix4x4::New();}

2，实现轴和圈的交互。以旋转为例。（感谢此网友的分享【VTK】可拖动的坐标轴MovableAxesWidget_Beyond欣的博客-CSDN博客）

void vtkMovableAxesRepresentation::Rotate(int X, int Y, double *p1, double *p2, double *vpn, int singleAxis)
{for(int i=0;i<3;i++){vtkMatrix4x4 *origin_matrixCircle = this->AxisCircel[i]->GetUserMatrix();vtkNew<vtkMatrix4x4> result_matrixCircle;RotateByMatrix(origin_matrixCircle,p1,p2,singleAxis,result_matrixCircle);this->AxisCircel[i]->SetUserMatrix(result_matrixCircle);vtkMatrix4x4 *origin_matrixAxis = this->HandleAxis[i]->GetUserMatrix();vtkNew<vtkMatrix4x4> result_matrixAxis;RotateByMatrix(origin_matrixAxis,p1,p2,singleAxis,result_matrixAxis);this->HandleAxis[i]->SetUserMatrix(result_matrixAxis);}this->Modified();this->BuildRepresentation();
}

void vtkMovableAxesRepresentation::RotateByMatrix(vtkMatrix4x4 *origin_matrix, double *p1, double *p2,int direction,vtkMatrix4x4* result_matrix)
{// 将鼠标位置移动到自身坐标系下，求两次鼠标位置向量在投影平面的夹角vtkNew<vtkTransform> trans;trans->SetMatrix(origin_matrix);double pos_t1[4] { p1[0], p1[1], p1[2], 1 };double pos_t2[4] { p2[0], p2[1], p2[2], 1 };vtkNew<vtkMatrix4x4> posture_inv;vtkMatrix4x4::Invert(origin_matrix, posture_inv);auto pos_t = posture_inv->MultiplyDoublePoint(pos_t1);double v1[3] = { pos_t[0], pos_t[1], pos_t[2] };pos_t = posture_inv->MultiplyDoublePoint(pos_t2);double v2[3] = { pos_t[0], pos_t[1], pos_t[2] };double normal[3];if(direction==0){normal[0] = 1;normal[1] = 0;normal[2] = 0;}else if(direction==1){normal[0] = 0;normal[1] = 1;normal[2] = 0;}else if(direction==2){normal[0] = 0;normal[1] = 0;normal[2] = 1;}double projection1[3], projection2[3];GetPlaneProjection(normal, v1, projection1);GetPlaneProjection(normal, v2, projection2);vtkMath::Normalize(projection1);vtkMath::Normalize(projection2);double axis[3];vtkMath::Cross(projection1, projection2, axis);double radians = acos(vtkMath::Dot(projection1, projection2));double degrees = vtkMath::DegreesFromRadians(radians);trans->RotateWXYZ(degrees, axis);result_matrix->DeepCopy(trans->GetMatrix());
}

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VTK可移动三维坐标轴 vtkMovableAxesWidget

一.需求

二，步骤

三，实现

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