Fix zooming

If chart is zoomed only horizontally or vertically then the range for
the other direction should not change. This is now checked by comparing
the minimum and maximum values to the axis span.

Change-Id: Icb5e14fc41afcedd7f75e60ca3ad6f699b053ae7
Task-number: QTRD-3399
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/charts/domain/xydomain.cpp b/src/charts/domain/xydomain.cpp
index e782716d..3e93ef68 100644
--- a/src/charts/domain/xydomain.cpp
+++ b/src/charts/domain/xydomain.cpp
@@ -75,6 +75,15 @@ void XYDomain::zoomIn(const QRectF &rect)
     minY = maxY - dy * rect.bottom();
     maxY = maxY - dy * rect.top();
 
+    if ((maxX - minX) == spanX()) {
+        minX = m_minX;
+        maxX = m_maxX;
+    }
+    if ((maxY - minY) == spanY()) {
+        minY = m_minY;
+        maxY = m_maxY;
+    }
+
     setRange(minX, maxX, minY, maxY);
 }
 
@@ -94,6 +103,15 @@ void XYDomain::zoomOut(const QRectF &rect)
     maxY = minY + dy * rect.bottom();
     minY = maxY - dy * m_size.height();
 
+    if ((maxX - minX) == spanX()) {
+        minX = m_minX;
+        maxX = m_maxX;
+    }
+    if ((maxY - minY) == spanY()) {
+        minY = m_minY;
+        maxY = m_maxY;
+    }
+
     setRange(minX, maxX, minY, maxY);
 }