彻底改版2.0

third/qwtdemo/examples/animation/main.cpp

@@ -0,0 +1,46 @@
+#include <qapplication.h>
+#include "plot.h"
+
+#ifndef QWT_NO_OPENGL
+#define USE_OPENGL 1
+#endif
+
+#if USE_OPENGL
+#include <qgl.h>
+#include <qwt_plot_glcanvas.h>
+#else
+#include <qwt_plot_canvas.h>
+#endif
+
+int main ( int argc, char **argv )
+{
+#if USE_OPENGL
+#if QT_VERSION >= 0x040600 && QT_VERSION < 0x050000
+    // on my box QPaintEngine::OpenGL2 has serious problems, f.e:
+    // the lines of a simple drawRect are wrong.
+
+    QGL::setPreferredPaintEngine( QPaintEngine::OpenGL );
+#endif
+#endif
+
+    QApplication a( argc, argv );
+
+    Plot plot;
+
+#if USE_OPENGL
+    QwtPlotGLCanvas *canvas = new QwtPlotGLCanvas();
+    canvas->setFrameStyle( QwtPlotGLCanvas::NoFrame );
+#else
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setFrameStyle( QFrame::NoFrame );
+    canvas->setPaintAttribute( QwtPlotCanvas::BackingStore, false );
+#endif
+
+    plot.setCanvas( canvas );
+    plot.setCanvasBackground( QColor( 30, 30, 50 ) );
+
+    plot.resize( 400, 400 );
+    plot.show();
+
+    return a.exec();
+}