ModelEditor: Implement zoom of diagrams.

All elements of a zoomed diagram must be dran anti-aliased. This change
removes the extra handling of drawing vertical or horizontal lines
without anti-alias. The complete graphics view is drawn anti-aliased
instead.

Change-Id: I6fc041b6d70da5a7a7bcb8e97d07990517380b90
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/plugins/modeleditor/modeleditor.cpp b/src/plugins/modeleditor/modeleditor.cpp
index db17e50c5a3..72326cebe83 100644
--- a/src/plugins/modeleditor/modeleditor.cpp
+++ b/src/plugins/modeleditor/modeleditor.cpp
@@ -100,6 +100,7 @@ namespace ModelEditor {
 namespace Internal {
 
 static const char PROPERTYNAME_TOOLBARID[] = "ToolbarId";
+static const double ZOOM_FACTOR = 1.05;
 
 class ModelEditor::ModelEditorPrivate
 {
@@ -558,6 +559,25 @@ void ModelEditor::exportDiagram()
     }
 }
 
+void ModelEditor::zoomIn()
+{
+    QTransform transform = d->diagramView->transform();
+    transform.scale(ZOOM_FACTOR, ZOOM_FACTOR);
+    d->diagramView->setTransform(transform);
+}
+
+void ModelEditor::zoomOut()
+{
+    QTransform transform = d->diagramView->transform();
+    transform.scale(1.0 / ZOOM_FACTOR, 1.0 / ZOOM_FACTOR);
+    d->diagramView->setTransform(transform);
+}
+
+void ModelEditor::resetZoom()
+{
+    d->diagramView->setTransform(QTransform());
+}
+
 qmt::MPackage *ModelEditor::guessSelectedPackage() const
 {
     qmt::MPackage *package = 0;