jfjoch_viewer: Pan with right click + center 000 button

viewer/windows/JFJochViewerReciprocalSpaceWindow.cpp

@@ -11,6 +11,7 @@
 #include <algorithm>
 #include <cmath>
 #include <limits>
+#include <QPushButton>
 
 // ============================================================================
 //  Shaders
@@ -194,6 +195,11 @@ void ReciprocalSpaceGLView::setLines(const std::vector<Vertex> &lines) {
     update();
 }
 
+void ReciprocalSpaceGLView::resetTarget() {
+    target_ = QVector3D(0.0f, 0.0f, 0.0f);
+    update();
+}
+
 // ---------------------------------------------------------------------------
 
 void ReciprocalSpaceGLView::setupVAO(QOpenGLVertexArrayObject &vao,
@@ -269,7 +275,7 @@ void ReciprocalSpaceGLView::mouseMoveEvent(QMouseEvent *e) {
         pitch_ += delta.y() * 0.5f;
         pitch_  = qBound(-89.0f, pitch_, 89.0f);
         update();
-    } else if (e->buttons() & Qt::MiddleButton) {
+    } else if (e->buttons() & Qt::RightButton) {
         const float panScale = zoom_ * 0.0015f;
 
         QMatrix4x4 rot;
@@ -366,10 +372,13 @@ JFJochViewerReciprocalSpaceWindow::JFJochViewerReciprocalSpaceWindow(QWidget *pa
     showPredictedCheck = new QCheckBox("Show predicted nodes", central);
     showPredictedCheck->setChecked(true);
 
+    auto *centerOriginButton = new QPushButton("Center 000", central);
+
     controls->addWidget(crystalFrameCheck);
     controls->addWidget(showCellCheck);
     controls->addWidget(showPredictedCheck);
     controls->addStretch(1);
+    controls->addWidget(centerOriginButton);
 
     layout->addLayout(controls);
     setCentralWidget(central);
@@ -380,6 +389,8 @@ JFJochViewerReciprocalSpaceWindow::JFJochViewerReciprocalSpaceWindow(QWidget *pa
             this, &JFJochViewerReciprocalSpaceWindow::rebuildGL);
     connect(showPredictedCheck, &QCheckBox::toggled,
             this, &JFJochViewerReciprocalSpaceWindow::rebuildGL);
+    connect(centerOriginButton, &QPushButton::clicked,
+            glView_, &ReciprocalSpaceGLView::resetTarget);
 
     // Reuse the existing helper-window zoom signal. The main window should connect
     // this to JFJochDiffractionImage::centerOnSpot, like the spot/reflection lists.

viewer/windows/JFJochViewerReciprocalSpaceWindow.h

@@ -42,6 +42,8 @@ public:
         float pickable = 0.0f;
     };
 
+    void resetTarget();
+
     // Called by the outer window whenever data changes.
     void setSpots(const std::vector<Vertex> &spots);
     void setLines(const std::vector<Vertex> &lines);   // axes + cell vectors