全国商务网站大全,景德镇做网站的公司,什么值得买wordpress模板,电商网站设计岗位主要是前一段事件看到VTK的一个例子#xff1a; 该案例是vtk.js写的#xff0c;觉得很有意思#xff0c;个人正好也要用到#xff0c;于是萌生了用C修改VTK源码来实现该功能的想法。原本以为很简单#xff0c;只需要修改一下vtkResliceCursor就可以了#xff0c;加上小球#… 前一段事件看到VTK的一个例子 该案例是vtk.js写的觉得很有意思个人正好也要用到于是萌生了用C修改VTK源码来实现该功能的想法。原本以为很简单只需要修改一下vtkResliceCursor就可以了加上小球加上几个Actor就能实现没想到该功能整花了我差不多一个月的时间。但也学到了不少知识下面就该功能的实现效果和方法做个大致解说
我实现的效果 实现方法
1首先在vtkResliceCursor中定义六个小球的位置。因为是XYZ三个轴每个轴上两个小球所以总共有六个小球。代码
void vtkResliceCursor::BuildCursorGeometryWithoutHole()
{// 其他源码省略.......for (int i 0; i 3; i){//wulc{this-SpherePoints[0][i] this-Center[i] - sphereLength * this-XAxis[i];this-SpherePoints[1][i] this-Center[i] sphereLength * this-XAxis[i];this-SpherePoints[2][i] this-Center[i] - sphereLength * this-YAxis[i];this-SpherePoints[3][i] this-Center[i] sphereLength * this-YAxis[i];this-SpherePoints[4][i] this-Center[i] - sphereLength * this-ZAxis[i];this-SpherePoints[5][i] this-Center[i] sphereLength * this-ZAxis[i];}}// 其他源码省略.......
}sphereLength 是一个自定义的常数也就是中心到小球的距离。可以是 30 40 50 .。。。。 除此之外我们还要定义一个函数通过该函数可以获取这六个小球的坐标。比如 GetPointPosition(double p[6][3]);
2,在vtkResliceCursorPicker中判断鼠标是否靠近小球中心位置靠近小球坐标时将鼠标光标变为手掌形状。判断方法就是鼠标的位置和小球位置的距离其中有现成的代码
/----------------wulc---------------------------------------------------
int vtkResliceCursorPicker::IntersectPointWithPoint(double p1[3], double p2[3], double Points[], double tol)
{double pts[6][3] { {0,0,0} };for (size_t i 0; i 6; i){pts[i][0] Points[3*i];pts[i][1] Points[3*i 1];pts[i][2] Points[3 * i 2];}int j 0;for ( ; j 6; j){double X[4] { pts[j][0], pts[j][1], pts[j][2], 1 };int i;double ray[3], rayFactor, projXYZ[3];for (i 0; i 3; i){ray[i] p2[i] - p1[i];}if ((rayFactor vtkMath::Dot(ray, ray)) 0.0){return 0;}const double t (ray[0] * (X[0] - p1[0]) ray[1] * (X[1] - p1[1]) ray[2] * (X[2] - p1[2])) / rayFactor;if (t 0.0 t 1.0){for (i 0; i 3; i){projXYZ[i] p1[i] t * ray[i];if (fabs(X[i] - projXYZ[i]) tol){break;}}if (i 2) // within tolerance{return 1;}}}return 0;
} 3最后要在vtkResliceCursorActor类中添加小球代码
//wulcif (this-Renderer nullptr) return;if (axisNormal 1)//x-z平面{double* position this-CursorAlgorithm-GetResliceCursor()-GetSpherePostion(2);if (fabs(position[0] - 0.0) 0.001 || fabs(position[1] - 0.0) 0.001 || fabs(position[2] - 0.0) 0.001){this-SphereActor[2]-GetProperty()-SetColor(1, 0, 0);this-SphereActor[3]-GetProperty()-SetColor(1, 0, 0);this-SphereActor[2]-SetPosition(position[0], position[1], position[2]);this-SphereActor[3]-SetPosition(position[3], position[4], position[5]);position this-CursorAlgorithm-GetResliceCursor()-GetSpherePostion(0);this-SphereActor[0]-GetProperty()-SetColor(0, 0, 1);this-SphereActor[1]-GetProperty()-SetColor(0, 0, 1);this-SphereActor[0]-SetPosition(position[0], position[1], position[2]);this-SphereActor[1]-SetPosition(position[3], position[4], position[5]);}}else if (axisNormal 2)//x-y平面{double* position this-CursorAlgorithm-GetResliceCursor()-GetSpherePostion(0);if (fabs(position[0] - 0.0) 0.001 || fabs(position[1] - 0.0) 0.001 || fabs(position[2] - 0.0) 0.001){this-SphereActor[0]-GetProperty()-SetColor(0, 1, 0);this-SphereActor[1]-GetProperty()-SetColor(0, 1, 0);this-SphereActor[0]-SetPosition(position[0], position[1], position[2]);this-SphereActor[1]-SetPosition(position[3], position[4], position[5]);position this-CursorAlgorithm-GetResliceCursor()-GetSpherePostion(1);this-SphereActor[2]-GetProperty()-SetColor(1, 0, 0);this-SphereActor[3]-GetProperty()-SetColor(1, 0, 0);this-SphereActor[2]-SetPosition(position[0], position[1], position[2]);this-SphereActor[3]-SetPosition(position[3], position[4], position[5]);}}else if (axisNormal 0) //y-z平面{double* position this-CursorAlgorithm-GetResliceCursor()-GetSpherePostion(2);if (fabs(position[0] - 0.0) 0.001 || fabs(position[1] - 0.0) 0.001 || fabs(position[2] - 0.0) 0.001){this-SphereActor[0]-GetProperty()-SetColor(0, 1, 0);this-SphereActor[1]-GetProperty()-SetColor(0, 1, 0);this-SphereActor[0]-SetPosition(position[0], position[1], position[2]);this-SphereActor[1]-SetPosition(position[3], position[4], position[5]);position this-CursorAlgorithm-GetResliceCursor()-GetSpherePostion(1);this-SphereActor[2]-GetProperty()-SetColor(0, 0, 1);this-SphereActor[3]-GetProperty()-SetColor(0, 0, 1);this-SphereActor[2]-SetPosition(position[0], position[1], position[2]);this-SphereActor[3]-SetPosition(position[3], position[4], position[5]);}}
这就可以了欢迎小伙伴能够一块讨论。
