Merge pull request #1739 from zenustech/revert-1734-revert-1729-camer…

…a-move

camera-move

ui/zenoedit/viewport/cameracontrol.cpp

@@ -297,7 +297,24 @@ void CameraControl::fakeMouseMoveEvent(QMouseEvent *event)
         }
     }
 
-    if (!bTransform && (event->buttons() & (rotateButton | moveButton))) {
+    if (!bTransform && ctrl_pressed && (event->buttons() & Qt::MiddleButton)) {
+        float ratio = QApplication::desktop()->devicePixelRatio();
+        float dx = xpos - m_lastMidButtonPos.x(), dy = ypos - m_lastMidButtonPos.y();
+        dx *= ratio / m_res[0];
+        dy *= ratio / m_res[1];
+        float cos_t = cos(getTheta());
+        float sin_t = sin(getTheta());
+        float cos_p = cos(getPhi());
+        float sin_p = sin(getPhi());
+        QVector3D back(cos_t * sin_p, sin_t, -cos_t * cos_p);
+        QVector3D delta = -back * dy;
+        auto c = getCenter();
+        QVector3D center = {c[0], c[1], c[2]};
+        center += delta * getRadius();
+        setCenter({float(center.x()), float(center.y()), float(center.z())});
+        m_lastMidButtonPos = QPointF(xpos, ypos);
+    }
+    else if (!bTransform && (event->buttons() & (rotateButton | moveButton))) {
         float ratio = QApplication::desktop()->devicePixelRatio();
         float dx = xpos - m_lastMidButtonPos.x(), dy = ypos - m_lastMidButtonPos.y();
         dx *= ratio / m_res[0];