fix: Correct dynamic grid scaling based on camera distance

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/SketchGrid.cpp

@@ -14,18 +14,18 @@ struct GridParams {
     int gridSize;
 };
 
-GridParams getGridParams(float zoom)
+GridParams getGridParams(float distance)
 {
-    if (zoom > 8.0f) {
-        return { 0.2f, 1.0f, 10 };
-    } else if (zoom > 2.0f) {
-        return { 1.0f, 5.0f, 50 };
-    } else if (zoom > 0.8f) {
-        return { 5.0f, 25.0f, 250 };
-    } else if (zoom > 0.4f) {
-        return { 10.0f, 50.0f, 500 };
-    } else {
+    if (distance > 80.0f) {
         return { 20.0f, 100.0f, 1000 };
+    } else if (distance > 40.0f) {
+        return { 10.0f, 50.0f, 500 };
+    } else if (distance > 20.0f) {
+        return { 5.0f, 25.0f, 250 };
+    } else if (distance > 8.0f) {
+        return { 1.0f, 5.0f, 50 };
+    } else { // zoomed in
+        return { 0.2f, 1.0f, 10 };
     }
 }
 } // namespace
@@ -72,7 +72,7 @@ void SketchGrid::paintGL(SketchPlane plane, QOpenGLShaderProgram* shaderProgram,
 
 void SketchGrid::drawGridLines(SketchPlane plane, QOpenGLShaderProgram* shaderProgram, int colorLoc)
 {
-    auto params = getGridParams(m_viewport->camera()->zoom());
+    auto params = getGridParams(-m_viewport->camera()->zoom());
     const float minorIncrement = params.minorIncrement;
     const int gridSize = params.gridSize;
 
@@ -160,7 +160,7 @@ void SketchGrid::paintAxisLabels(QPainter& painter, SketchGrid::SketchPlane plan
     painter.setPen(Qt::white);
     painter.setFont(QFont("Arial", 10));
 
-    auto params = getGridParams(m_viewport->camera()->zoom());
+    auto params = getGridParams(-m_viewport->camera()->zoom());
     const float majorIncrement = params.majorIncrement;
     const int range = params.gridSize;