Visualize the pulse as a flash seen by the observer

src/pulsaranimationwidget.cpp

@@ -554,6 +554,14 @@ void PulsarAnimationWidget::paintGL()
             renderText(10, 25, -100, QString::fromLocal8Bit("Copyright © 2009-2011"), font);
             renderText(10, 10, -100, QString::fromLocal8Bit("Max-Planck-Insitut für Gravitationsphysik"), font);
 
+            // render pulse "flash"
+            int profileIndex = (int) round(m_pulsarRotationAngle);
+            profileIndex = profileIndex == 360 ? 0 : profileIndex;
+            GLfloat flashAlpha = m_pulseProfile[profileIndex];
+            glColor4f(1.0, 1.0, 0.0, 0.75 * flashAlpha);
+            glTranslatef(0.0, 0.0, -1.0);
+            glRectf(0.0, 0.0, width(), height());
+
             // restore original state
             glMatrixMode(GL_PROJECTION);
         }