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-rw-r--r--examples/datavisualization/surface/main.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/examples/datavisualization/surface/main.cpp b/examples/datavisualization/surface/main.cpp
index ca5783af..5e7bd50c 100644
--- a/examples/datavisualization/surface/main.cpp
+++ b/examples/datavisualization/surface/main.cpp
@@ -31,6 +31,7 @@
#include <QtWidgets/QGroupBox>
#include <QtWidgets/QComboBox>
#include <QtWidgets/QLabel>
+#include <QtWidgets/QMessageBox>
#include <QtGui/QPainter>
#include <QtGui/QScreen>
@@ -42,6 +43,13 @@ int main(int argc, char **argv)
QWidget *container = QWidget::createWindowContainer(graph);
//! [0]
+ if (!graph->hasContext()) {
+ QMessageBox msgBox;
+ msgBox.setText("Couldn't initialize the OpenGL context.");
+ msgBox.exec();
+ return -1;
+ }
+
QSize screenSize = graph->screen()->size();
container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 1.6));
container->setMaximumSize(screenSize);