Cleanup examples/effects/lighting.

There's no need to re-implement QGraphicsDropShadowEffect anymore.

1 files changed, 19 insertions, 3 deletions

diff --git a/examples/effects/lighting/lighting.cpp b/examples/effects/lighting/lighting.cpp
index 2294b36..e309e2e 100644
--- a/examples/effects/lighting/lighting.cpp
+++ b/examples/effects/lighting/lighting.cpp
@@ -43,8 +43,6 @@
 
 #include <QtGui>
 
-#include "shadoweffect.h"
-
 #ifndef M_PI
 #define M_PI 3.14159265358979323846
 #endif
@@ -98,7 +96,7 @@ void Lighting::setupScene()
 
             item->setPen(QPen(Qt::black));
             item->setBrush(QBrush(Qt::white));
-            item->setGraphicsEffect(new ShadowEffect(item, m_lightSource));
+            item->setGraphicsEffect(new QGraphicsDropShadowEffect);
             item->setZValue(1);
             item->setPos(i * 80, j * 80);
             m_scene.addItem(item);
@@ -114,6 +112,24 @@ void Lighting::animate()
     qreal xs = 200 * sin(angle) - 40 + 25;
     qreal ys = 200 * cos(angle) - 40 + 25;
     m_lightSource->setPos(xs, ys);
+
+    for (int i = 0; i < m_items.size(); ++i) {
+        QGraphicsItem *item = m_items.at(i);
+        Q_ASSERT(item);
+        QGraphicsDropShadowEffect *effect = static_cast<QGraphicsDropShadowEffect *>(item->graphicsEffect());
+        Q_ASSERT(effect);
+
+        QPointF delta(item->x() - xs, item->y() - ys);
+        effect->setOffset(delta.toPoint() / 30);
+
+        qreal dx = delta.x();
+        qreal dy = delta.y();
+        qreal dd = sqrt(dx * dx + dy * dy);
+        QColor color = effect->color();
+        color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
+        effect->setColor(color);
+    }
+
     m_scene.update();
 }