QmlDesigner: Add ScaleGizmo to 3D edit view

ScaleGizmo allows scaling in the direction of local or global axes,
as well as uniform scaling. Any scale component cannot be made
negative with ScaleGizmo.

Change-Id: I9b98d9593e07ded340178b07b73fa1b72421ba20
Fixes: QDS-1195
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

1 files changed, 86 insertions, 5 deletions

diff --git a/share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/mousearea3d.cpp b/share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/mousearea3d.cpp
index 4c1fdcc78e..fe84ed13a6 100644
--- a/share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/mousearea3d.cpp
+++ b/share/qtcreator/qml/qmlpuppet/qml2puppet/editor3d/mousearea3d.cpp
@@ -60,6 +60,11 @@ bool MouseArea3D::grabsMouse() const
     return m_grabsMouse;
 }
 
+bool MouseArea3D::active() const
+{
+    return m_active;
+}
+
 qreal MouseArea3D::x() const
 {
     return m_x;
@@ -103,6 +108,15 @@ void MouseArea3D::setGrabsMouse(bool grabsMouse)
     emit grabsMouseChanged(grabsMouse);
 }
 
+void MouseArea3D::setActive(bool active)
+{
+    if (m_active == active)
+        return;
+
+    m_active = active;
+    emit activeChanged(active);
+}
+
 void MouseArea3D::setX(qreal x)
 {
     if (qFuzzyCompare(m_x, x))
@@ -190,6 +204,73 @@ QVector3D MouseArea3D::rayIntersectsPlane(const QVector3D &rayPos0,
     return rayPos0 + distanceFromRayPos0ToPlane * rayDirection;
 }
 
+// Get a new scale based on a relative scene distance along an axis (used to adjust scale via drag)
+// This function never returns a negative scaling
+QVector3D MouseArea3D::getNewScale(QQuick3DNode *node, const QVector3D &startScale,
+                                   const QVector3D &pressPos,
+                                   const QVector3D &sceneRelativeDistance, float scaler)
+{
+    if (node) {
+        // Note: This only returns correct scale when scale is positive
+        auto getScale = [&](const QMatrix4x4 &m) -> QVector3D {
+            return QVector3D(m.column(0).length(), m.column(1).length(), m.column(2).length());
+        };
+        const float constantDragScaler = 0.1f;
+        const float nonZeroValue = 0.0001f;
+
+        if (qFuzzyIsNull(scaler))
+            scaler = nonZeroValue;
+
+        const QVector3D scenePos = node->scenePosition();
+        const QMatrix4x4 parentTransform = node->parentNode()->sceneTransform();
+        QMatrix4x4 newTransform = node->sceneTransform();
+        QVector3D normalRelDist = sceneRelativeDistance.normalized();
+        float direction = QVector3D::dotProduct((pressPos - scenePos).normalized(), normalRelDist);
+        float magnitude = constantDragScaler * sceneRelativeDistance.length() / scaler;
+
+        // Reset everything but rotation to ensure translation and scale do not affect rotate below
+        newTransform(0,3) = 0;
+        newTransform(1,3) = 0;
+        newTransform(2,3) = 0;
+        QVector3D curScale = getScale(newTransform);
+        if (qFuzzyIsNull(curScale.x()))
+            curScale.setX(nonZeroValue);
+        if (qFuzzyIsNull(curScale.y()))
+            curScale.setY(nonZeroValue);
+        if (qFuzzyIsNull(curScale.z()))
+            curScale.setZ(nonZeroValue);
+        newTransform.scale({1.f / curScale.x(), 1.f / curScale.y(), 1.f / curScale.z()});
+
+        // Rotate relative distance according to object rotation
+        normalRelDist = newTransform.inverted().map(normalRelDist).normalized();
+
+        // Ensure scaling is always positive/negative according to direction
+        normalRelDist.setX(qAbs(normalRelDist.x()));
+        normalRelDist.setY(qAbs(normalRelDist.y()));
+        normalRelDist.setZ(qAbs(normalRelDist.z()));
+        QVector3D scaleVec = normalRelDist;
+        scaleVec *= magnitude;
+        if (direction > 0) {
+            scaleVec.setX(scaleVec.x() + 1.f);
+            scaleVec.setY(scaleVec.y() + 1.f);
+            scaleVec.setZ(scaleVec.z() + 1.f);
+        } else {
+            scaleVec.setX(1.f - scaleVec.x());
+            scaleVec.setY(1.f - scaleVec.y());
+            scaleVec.setZ(1.f - scaleVec.z());
+        }
+        scaleVec *= startScale;
+
+        newTransform = parentTransform;
+        newTransform.scale(scaleVec);
+
+        const QMatrix4x4 localTransform = parentTransform.inverted() * newTransform;
+        return getScale(localTransform);
+    }
+
+    return startScale;
+}
+
 QVector3D MouseArea3D::getMousePosInPlane(const QPointF &mousePosInView) const
 {
     const QVector3D mousePos1(float(mousePosInView.x()), float(mousePosInView.y()), 0);
@@ -207,8 +288,8 @@ QVector3D MouseArea3D::getMousePosInPlane(const QPointF &mousePosInView) const
 
 bool MouseArea3D::eventFilter(QObject *, QEvent *event)
 {
-    if (m_grabsMouse && s_mouseGrab && s_mouseGrab != this
-            && (m_priority <= s_mouseGrab->m_priority || s_mouseGrab->m_dragging)) {
+    if (!m_active || (m_grabsMouse && s_mouseGrab && s_mouseGrab != this
+            && (m_priority <= s_mouseGrab->m_priority || s_mouseGrab->m_dragging))) {
         return false;
     }
 
@@ -227,7 +308,7 @@ bool MouseArea3D::eventFilter(QObject *, QEvent *event)
             m_mousePosInPlane = getMousePosInPlane(mouseEvent->pos());
             if (mouseOnTopOfMouseArea(m_mousePosInPlane)) {
                 setDragging(true);
-                emit pressed(m_mousePosInPlane);
+                emit pressed(m_mousePosInPlane, mouseEvent->globalPos());
                 if (m_grabsMouse) {
                     if (s_mouseGrab && s_mouseGrab != this) {
                         s_mouseGrab->setDragging(false);
@@ -250,7 +331,7 @@ bool MouseArea3D::eventFilter(QObject *, QEvent *event)
                 if (qFuzzyCompare(mousePosInPlane.z(), -1))
                     mousePosInPlane = m_mousePosInPlane;
                 setDragging(false);
-                emit released(mousePosInPlane);
+                emit released(mousePosInPlane, mouseEvent->globalPos());
                 if (m_grabsMouse) {
                     if (s_mouseGrab && s_mouseGrab != this) {
                         s_mouseGrab->setDragging(false);
@@ -290,7 +371,7 @@ bool MouseArea3D::eventFilter(QObject *, QEvent *event)
 
         if (m_dragging && !qFuzzyCompare(mousePosInPlane.z(), -1)) {
             m_mousePosInPlane = mousePosInPlane;
-            emit dragged(mousePosInPlane);
+            emit dragged(mousePosInPlane, mouseEvent->globalPos());
         }
 
         break;