QmlDesigner: Tie 3D helper grid to snap interval

Helper grid minimum step now changes to match set snap interval.

Fixes: QDS-10624
Change-Id: I82b8206774b3769bee19be5eb0f38930f3b49c12
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

src/tools/qml2puppet/mockfiles/qt6/HelperGrid.qml

@@ -13,9 +13,8 @@ Node {
     property bool orthoMode: false
     property double distance: 500
 
-    readonly property int minGridStep: 50
-    readonly property int maxGridStep: 32 * minGridStep
-    readonly property int gridArea: minGridStep * 512
+    readonly property int maxGridStep: 32 * _generalHelper.minGridStep
+    readonly property int gridArea: _generalHelper.minGridStep * 512
 
     // Step of the main lines of the grid, between those is always one subdiv line
     property int gridStep: 100
@@ -32,12 +31,13 @@ Node {
         return Math.atan(step / distance)
     }
 
-    onDistanceChanged: {
+    function calcStep()
+    {
         if (distance === 0)
             return
 
         // Calculate new grid step
-        let newStep = gridStep
+        let newStep = _generalHelper.minGridStep
         let gridRad = calcRad(newStep)
         while (gridRad < minGridRad && newStep < maxGridStep) {
             newStep *= 2
@@ -45,16 +45,13 @@ Node {
                 newStep = maxGridStep
             gridRad = calcRad(newStep)
         }
-        while (gridRad > minGridRad * 2 && newStep > minGridStep) {
-            newStep /= 2
-            if (newStep < minGridStep)
-                newStep = minGridStep
-            gridRad = calcRad(newStep)
-        }
         gridStep = newStep
         subGridMaterial.generalAlpha = Math.min(1, 2 * (1 - (minGridRad / gridRad)))
     }
 
+    onMaxGridStepChanged: calcStep()
+    onDistanceChanged: calcStep()
+
     // Note: Only one instance of HelperGrid is supported, as the geometry names are fixed
 
     Model { // Main grid lines

src/tools/qml2puppet/mockfiles/shaders/gridmaterial.frag

@@ -14,6 +14,11 @@ void MAIN()
         float cosAngle = dot(normalize(camDir), normalize(camLevel));
         float angleDepth = density * pow(cosAngle, 8);
         float alpha = generalAlpha * clamp((1.0 - ((angleDepth * depth - alphaStartDepth) / (alphaEndDepth - alphaStartDepth))), 0, 1);
+
+        // Force additional alpha when approaching the far clip of edit camera
+        if (depth > 90000.0)
+            alpha *= clamp((100000.0 - depth) / 10000.0, 0, 1);
+
         if (alpha > 0.01)
             FRAGCOLOR = vec4(color.x * alpha, color.y * alpha, color.z * alpha, alpha);
         else

src/tools/qml2puppet/qml2puppet/editor3d/generalhelper.cpp

@@ -954,6 +954,20 @@ QVector3D GeneralHelper::adjustScaleForSnap(const QVector3D &newScale)
     return adjScale;
 }
 
+void GeneralHelper::setSnapPositionInterval(double interval)
+{
+    if (m_snapPositionInterval != interval) {
+        m_snapPositionInterval = interval;
+        emit minGridStepChanged();
+    }
+}
+
+double GeneralHelper::minGridStep() const
+{
+    // Minimum grid step is a multiple of snap interval, as the last step is divided to subgrid
+    return 2. * m_snapPositionInterval;
+}
+
 void GeneralHelper::setBgColor(const QVariant &colors)
 {
     if (m_bgColor != colors) {

src/tools/qml2puppet/qml2puppet/editor3d/generalhelper.h

@@ -33,6 +33,7 @@ class GeneralHelper : public QObject
     Q_OBJECT
     Q_PROPERTY(bool isMacOS READ isMacOS CONSTANT)
     Q_PROPERTY(QVariant bgColor READ bgColor NOTIFY bgColorChanged FINAL)
+    Q_PROPERTY(double minGridStep READ minGridStep NOTIFY minGridStepChanged FINAL)
 
 public:
     GeneralHelper();
@@ -114,10 +115,12 @@ public:
     void setSnapPosition(bool enable) { m_snapPosition = enable; }
     void setSnapRotation(bool enable) { m_snapRotation = enable; }
     void setSnapScale(bool enable) { m_snapScale = enable; }
-    void setSnapPositionInterval(double interval) { m_snapPositionInterval = interval; }
+    void setSnapPositionInterval(double interval);
     void setSnapRotationInterval(double interval) { m_snapRotationInterval = interval; }
     void setSnapScaleInterval(double interval) { m_snapScaleInterval = interval / 100.; }
 
+    double minGridStep() const;
+
     void setBgColor(const QVariant &colors);
     QVariant bgColor() const { return m_bgColor; }
 
@@ -128,6 +131,8 @@ signals:
     void lockedStateChanged(QQuick3DNode *node);
     void rotationBlocksChanged();
     void bgColorChanged();
+    void minGridStepChanged();
+
 private:
     void handlePendingToolStateUpdate();
     QVector3D pivotScenePosition(QQuick3DNode *node) const;