Add (back) properties to QGraphicsItem to change the transformations component

This reapply commit 8ad5020940f10d4ecc5c5e8b3b9656531cb84ef3 and its
dependent change that has been reverted while rebasing the
recursivepaint branch.

With the new properties it is possible to easily animate transformations

Reviewed-by: Andreas

Documentation still need to be reviewed.

1 files changed, 199 insertions, 0 deletions

diff --git a/tests/auto/qgraphicsitem/tst_qgraphicsitem.cpp b/tests/auto/qgraphicsitem/tst_qgraphicsitem.cpp
index 41593b5..82c173b 100644
--- a/tests/auto/qgraphicsitem/tst_qgraphicsitem.cpp
+++ b/tests/auto/qgraphicsitem/tst_qgraphicsitem.cpp
@@ -220,6 +220,8 @@ private slots:
     void deviceTransform_data();
     void deviceTransform();
     void update();
+    void setTransformProperties_data();
+    void setTransformProperties();
 
     // task specific tests below me
     void task141694_textItemEnsureVisible();
@@ -6484,5 +6486,202 @@ void tst_QGraphicsItem::update()
     QCOMPARE(view.paintedRegion, expectedRegion);
 }
 
+void tst_QGraphicsItem::setTransformProperties_data()
+{
+    QTest::addColumn<QPointF>("origin");
+    QTest::addColumn<qreal>("rotationX");
+    QTest::addColumn<qreal>("rotationY");
+    QTest::addColumn<qreal>("rotationZ");
+    QTest::addColumn<qreal>("scaleX");
+    QTest::addColumn<qreal>("scaleY");
+    QTest::addColumn<qreal>("shearX");
+    QTest::addColumn<qreal>("shearY");
+
+    QTest::newRow("nothing") << QPointF() << qreal(0.0) << qreal(0.0) << qreal(0.0)
+                                          << qreal(1.0) << qreal(1.0) << qreal(0.0) << qreal(0.0);
+
+    QTest::newRow("rotationZ") << QPointF() << qreal(0.0) << qreal(0.0) << qreal(42.2)
+                                          << qreal(1.0) << qreal(1.0) << qreal(0.0) << qreal(0.0);
+
+    QTest::newRow("rotationXY") << QPointF() << qreal(12.5) << qreal(53.6) << qreal(0.0)
+                                          << qreal(1.0) << qreal(1.0) << qreal(0.0) << qreal(0.0);
+
+    QTest::newRow("rotationXYZ") << QPointF() << qreal(-25) << qreal(12) << qreal(556)
+                                          << qreal(1.0) << qreal(1.0) << qreal(0.0) << qreal(0.0);
+
+    QTest::newRow("rotationXYZ dicentred") << QPointF(-53, 25.2) 
+                                << qreal(-2578.2) << qreal(4565.2) << qreal(56)
+                                << qreal(1.0) << qreal(1.0) << qreal(0.0) << qreal(0.0);
+
+    QTest::newRow("Scale")    << QPointF() << qreal(0.0) << qreal(0.0) << qreal(0.0)
+                                          << qreal(6) << qreal(0.5) << qreal(0.0) << qreal(0.0);
+
+    QTest::newRow("Shear")    << QPointF() << qreal(0.0) << qreal(0.0) << qreal(0.0)
+                                          << qreal(1.0) << qreal(1.0) << qreal(2.2) << qreal(0.5);
+
+    QTest::newRow("Scale and Shear")    << QPointF() << qreal(0.0) << qreal(0.0) << qreal(0.0)
+                                          << qreal(5.2) << qreal(2.1) << qreal(5.2) << qreal(5.5);
+
+    QTest::newRow("Everything")  << QPointF() << qreal(41) << qreal(-23) << qreal(0.56)
+                                        << qreal(8.2) << qreal(-0.2) << qreal(-12) << qreal(-0.8);
+
+    QTest::newRow("Everything dicentred")  << QPointF(qreal(22.3), qreal(-56.2)) << qreal(-175) << qreal(196) << qreal(-1260)
+                                        << qreal(4) << qreal(2) << qreal(2.56) << qreal(0.8);
+}
+
+/**
+ * the normal QCOMPARE doesn't work because it doesn't use qFuzzyCompare
+ */
+#define QCOMPARE_TRANSFORM(X1, X2)   QVERIFY(((X1)*(X2).inverted()).isIdentity())
+
+void tst_QGraphicsItem::setTransformProperties()
+{
+    QFETCH(QPointF,origin);
+    QFETCH(qreal,rotationX);
+    QFETCH(qreal,rotationY);
+    QFETCH(qreal,rotationZ);
+    QFETCH(qreal,scaleX);
+    QFETCH(qreal,scaleY);
+    QFETCH(qreal,shearX);
+    QFETCH(qreal,shearY);
+
+    QTransform result;
+    result.translate(origin.x(), origin.y());
+    result.rotate(rotationX, Qt::XAxis);
+    result.rotate(rotationY, Qt::YAxis);
+    result.rotate(rotationZ, Qt::ZAxis);
+    result.shear(shearX, shearY);
+    result.scale(scaleX, scaleY);
+    result.translate(-origin.x(), -origin.y());
+
+    QGraphicsScene scene;
+    QGraphicsRectItem *item = new QGraphicsRectItem(QRectF(0, 0, 100, 100));
+    scene.addItem(item);
+
+    item->setRotation(rotationX, rotationY, rotationZ);
+    item->setScale(scaleX, scaleY);
+    item->setShear(shearX, shearY);
+    item->setTransformOrigin(origin);
+
+    QCOMPARE(item->xRotation(), rotationX);
+    QCOMPARE(item->yRotation(), rotationY);
+    QCOMPARE(item->zRotation(), rotationZ);
+    QCOMPARE(item->xScale(), scaleX);
+    QCOMPARE(item->yScale(), scaleY);
+    QCOMPARE(item->horizontalShear(), shearX);
+    QCOMPARE(item->verticalShear(), shearY);
+    QCOMPARE(item->transformOrigin(), origin);
+
+    QCOMPARE(QTransform(), item->transform());
+    QCOMPARE(result, item->sceneTransform());
+
+    //-----------------------------------------------------------------
+    //Change the rotation Z
+    item->setZRotation(45);
+    QTransform result2;
+    result2.translate(origin.x(), origin.y());
+    result2.rotate(rotationX, Qt::XAxis);
+    result2.rotate(rotationY, Qt::YAxis);
+    result2.rotate(45, Qt::ZAxis);
+    result2.shear(shearX, shearY);
+    result2.scale(scaleX, scaleY);
+    result2.translate(-origin.x(), -origin.y());
+
+    QCOMPARE(item->xRotation(), rotationX);
+    QCOMPARE(item->yRotation(), rotationY);
+    QCOMPARE(item->zRotation(), 45.0);
+    QCOMPARE(item->xScale(), scaleX);
+    QCOMPARE(item->yScale(), scaleY);
+    QCOMPARE(item->horizontalShear(), shearX);
+    QCOMPARE(item->verticalShear(), shearY);
+    QCOMPARE(item->transformOrigin(), origin);
+
+    QCOMPARE(QTransform(), item->transform());
+    QCOMPARE(result2, item->sceneTransform());
+
+    //-----------------------------------------------------------------
+    // calling setTransform() and setPos shoukld change the sceneTransform
+    item->setTransform(result);
+    item->setPos(100, -150.5);
+
+    QCOMPARE(item->xRotation(), rotationX);
+    QCOMPARE(item->yRotation(), rotationY);
+    QCOMPARE(item->zRotation(), 45.0);
+    QCOMPARE(item->xScale(), scaleX);
+    QCOMPARE(item->yScale(), scaleY);
+    QCOMPARE(item->horizontalShear(), shearX);
+    QCOMPARE(item->verticalShear(), shearY);
+    QCOMPARE(item->transformOrigin(), origin);
+    QCOMPARE(result, item->transform());
+
+    QTransform result3;
+
+    result3.translate(origin.x(), origin.y());
+    result3 = result * result3;
+    result3.rotate(rotationX, Qt::XAxis);
+    result3.rotate(rotationY, Qt::YAxis);
+    result3.rotate(45, Qt::ZAxis);
+    result3.shear(shearX, shearY);
+    result3.scale(scaleX, scaleY);
+    result3.translate(-origin.x(), -origin.y());
+
+    result3 *= QTransform::fromTranslate(100, -150.5); //the pos;
+
+    QCOMPARE(result3, item->sceneTransform());
+
+    //-----------------------------------------------------
+    // setting the propertiees should be the same as setting a transform
+    {//with center origin on the matrix
+        QGraphicsRectItem *item1 = new QGraphicsRectItem(QRectF(50.2, -150, 230.5, 119));
+        scene.addItem(item1);
+        QGraphicsRectItem *item2 = new QGraphicsRectItem(QRectF(50.2, -150, 230.5, 119));
+        scene.addItem(item2);
+
+        item1->setPos(12.3, -5);
+        item2->setPos(12.3, -5);
+        item1->setRotation(rotationX, rotationY, rotationZ);
+        item1->setScale(scaleX, scaleY);
+        item1->setShear(shearX, shearY);
+        item1->setTransformOrigin(origin);
+
+        item2->setTransform(result);
+
+        QCOMPARE_TRANSFORM(item1->sceneTransform(), item2->sceneTransform());
+
+        QCOMPARE_TRANSFORM(item1->itemTransform(item2), QTransform()); 
+        QCOMPARE_TRANSFORM(item2->itemTransform(item1), QTransform());
+    }
+
+    {//with center origin on the item
+        QGraphicsRectItem *item1 = new QGraphicsRectItem(QRectF(50.2, -150, 230.5, 119));
+        scene.addItem(item1);
+        QGraphicsRectItem *item2 = new QGraphicsRectItem(QRectF(50.2, -150, 230.5, 119));
+        scene.addItem(item2);
+
+        item1->setPos(12.3, -5);
+        item2->setPos(12.3, -5);
+        item1->setTransformOrigin(origin);
+        item2->setTransformOrigin(origin);
+
+        item1->setRotation(rotationX, rotationY, rotationZ);
+        item1->setScale(scaleX, scaleY);
+        item1->setShear(shearX, shearY);
+
+        QTransform tr;
+        tr.rotate(rotationX, Qt::XAxis);
+        tr.rotate(rotationY, Qt::YAxis);
+        tr.rotate(rotationZ, Qt::ZAxis);
+        tr.shear(shearX, shearY);
+        tr.scale(scaleX, scaleY);
+
+        item2->setTransform(tr);
+
+        QCOMPARE_TRANSFORM(item1->sceneTransform(), item2->sceneTransform());
+
+        QCOMPARE_TRANSFORM(item1->itemTransform(item2), QTransform()); 
+        QCOMPARE_TRANSFORM(item2->itemTransform(item1), QTransform());
+    }
+}
+
 QTEST_MAIN(tst_QGraphicsItem)
 #include "tst_qgraphicsitem.moc"