83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
#include "CameraMoveCallback.h"
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#include <vtkVertex.h>
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#include <vtkRenderer.h>
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#include <vtkRenderWindowInteractor.h>
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#include <vtkSmartPointer.h>
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#include <vtkCommand.h>
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#include <vtkRenderWindow.h>
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using std::string;
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void CameraMoveCallback::Execute(vtkObject *caller, unsigned long evId,
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void *callData) {
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// Note the use of reinterpret_cast to cast the caller to the expected type.
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auto intr = reinterpret_cast<vtkRenderWindowInteractor *>(caller);
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switch (evId) {
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case vtkCommand::KeyPressEvent:
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if (not strcmp("minus", intr->GetKeySym())) {
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zoom(false);
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} else if (not strcmp("equal", intr->GetKeySym())) {
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zoom(true);
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} else {
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pan(intr->GetKeySym());
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}
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break;
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case vtkCommand::MouseWheelForwardEvent:
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zoom(true);
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break;
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case vtkCommand::MouseWheelBackwardEvent:
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zoom(false);
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break;
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default:
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break;
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}
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// also calls the render function when the camera's position has not actually changed. This is a negligble inefficiency.
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intr->GetRenderWindow()->Render();
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}
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void CameraMoveCallback::zoom(const bool in) {
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double scale = this->cam->GetParallelScale();
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if (in) {
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scale -= 1;
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} else {
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scale += 1;
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}
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this->cam->SetParallelScale(scale);
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}
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void CameraMoveCallback::pan(const string dir) {
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double pos[3];
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this->cam->GetPosition(pos);
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if (dir == "Left" or dir == "h") {
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pos[0] -= 1;
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} else if (dir == "Up" or dir == "j" ) {
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pos[1] += 1;
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} else if (dir == "Right" or dir == "k" ) {
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pos[0] += 1;
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} else if (dir == "Down" or dir == "l" ) {
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pos[1] -= 1;
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}
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this->cam->SetPosition(pos);
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this->cam->SetFocalPoint(pos[0], pos[1], 0);
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}
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CameraMoveCallback::CameraMoveCallback() : cam(nullptr) {}
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CameraMoveCallback *CameraMoveCallback::New(vtkCamera *cam) {
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auto me = new CameraMoveCallback;
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me->setCam(cam);
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return me;
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}
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void CameraMoveCallback::setCam(const vtkSmartPointer<vtkCamera> &cam) {
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this->cam = cam;
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}
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