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authorRhys Weatherley <rhys.weatherley@nokia.com>2009-10-26 00:36:45 (GMT)
committerRhys Weatherley <rhys.weatherley@nokia.com>2009-10-26 01:03:23 (GMT)
commit1a299a9631a2d1b4e07cedfece7af5318a766fe6 (patch)
treebde51d4c5acdc7cd975322932bdbea02bcda59bb /tests/auto/qgraphicstransform
parent0d6104d763f4cb32ac6117b3f951afcb73fc50e6 (diff)
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Optimize QGraphicsRotation's use of QMatrix4x4
Previous code was creating a full 3D rotation matrix and then projecting back to 2D. This change combines the two steps into one to avoid calculating matrix components that will be dropped. Reviewed-by: Sarah Smith
Diffstat (limited to 'tests/auto/qgraphicstransform')
-rw-r--r--tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp69
1 files changed, 68 insertions, 1 deletions
diff --git a/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp b/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp
index eb5c099..d8ab06e 100644
--- a/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp
+++ b/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp
@@ -59,6 +59,8 @@ private slots:
void rotation();
void rotation3d_data();
void rotation3d();
+ void rotation3dArbitraryAxis_data();
+ void rotation3dArbitraryAxis();
};
@@ -88,7 +90,7 @@ static QTransform transform2D(const QGraphicsTransform& t)
{
QMatrix4x4 m;
t.applyTo(&m);
- return m.toTransform(0);
+ return m.toTransform();
}
void tst_QGraphicsTransform::scale()
@@ -255,6 +257,19 @@ void tst_QGraphicsTransform::rotation3d()
QVERIFY(fuzzyCompare(transform2D(rotation), expected));
+ // Check that "rotation" produces the 4x4 form of the 3x3 matrix.
+ // i.e. third row and column are 0 0 1 0.
+ t.setIdentity();
+ rotation.applyTo(&t);
+ QMatrix4x4 r(expected);
+ if (sizeof(qreal) == sizeof(float) && angle == 268) {
+ // This test fails, on only this angle, when qreal == float
+ // because the deg2rad value in QTransform is not accurate
+ // enough to match what QMatrix4x4 is doing.
+ } else {
+ QVERIFY(qFuzzyCompare(t, r));
+ }
+
//now let's check that a null vector will not change the transform
rotation.setAxis(QVector3D(0, 0, 0));
rotation.setOrigin(QVector3D(10, 10, 0));
@@ -276,6 +291,58 @@ void tst_QGraphicsTransform::rotation3d()
QVERIFY(transform2D(rotation).isIdentity());
}
+void tst_QGraphicsTransform::rotation3dArbitraryAxis_data()
+{
+ QTest::addColumn<QVector3D>("axis");
+ QTest::addColumn<qreal>("angle");
+
+ QVector3D axis1 = QVector3D(1.0f, 1.0f, 1.0f);
+ QVector3D axis2 = QVector3D(2.0f, -3.0f, 0.5f);
+ QVector3D axis3 = QVector3D(-2.0f, 0.0f, -0.5f);
+ QVector3D axis4 = QVector3D(0.0001f, 0.0001f, 0.0001f);
+ QVector3D axis5 = QVector3D(0.01f, 0.01f, 0.01f);
+
+ for (int angle = 0; angle <= 360; angle++) {
+ QTest::newRow("test rotation on (1, 1, 1)") << axis1 << qreal(angle);
+ QTest::newRow("test rotation on (2, -3, .5)") << axis2 << qreal(angle);
+ QTest::newRow("test rotation on (-2, 0, -.5)") << axis3 << qreal(angle);
+ QTest::newRow("test rotation on (.0001, .0001, .0001)") << axis4 << qreal(angle);
+ QTest::newRow("test rotation on (.01, .01, .01)") << axis5 << qreal(angle);
+ }
+}
+
+void tst_QGraphicsTransform::rotation3dArbitraryAxis()
+{
+ QFETCH(QVector3D, axis);
+ QFETCH(qreal, angle);
+
+ QGraphicsRotation rotation;
+ rotation.setAxis(axis);
+
+ QMatrix4x4 t;
+ rotation.applyTo(&t);
+
+ QVERIFY(t.isIdentity());
+ QVERIFY(transform2D(rotation).isIdentity());
+
+ rotation.setAngle(angle);
+
+ // Compute the expected answer using QMatrix4x4 and a projection.
+ // These two steps are performed in one hit by QGraphicsRotation.
+ QMatrix4x4 exp;
+ exp.rotate(angle, axis);
+ QTransform expected = exp.toTransform(1024.0f);
+
+ QVERIFY(fuzzyCompare(transform2D(rotation), expected));
+
+ // Check that "rotation" produces the 4x4 form of the 3x3 matrix.
+ // i.e. third row and column are 0 0 1 0.
+ t.setIdentity();
+ rotation.applyTo(&t);
+ QMatrix4x4 r(expected);
+ QVERIFY(qFuzzyCompare(t, r));
+}
+
QTEST_MAIN(tst_QGraphicsTransform)
#include "tst_qgraphicstransform.moc"