Method logarithmicNaturalXMapping

tests/backend/Datapicker/DatapickerTest.cpp:494–535

Test if setting curve points on the image result in correct values for lnX mapping

// Test if setting curve points on the image result in correct values for lnX mapping
void DatapickerTest::logarithmicNaturalXMapping() {
	Datapicker datapicker(QStringLiteral("Test"));
	auto* image = datapicker.image();

	// Set reference points
	datapicker.addNewPoint(QPointF(3, 10), image);
	datapicker.addNewPoint(QPointF(3, 0), image);
	datapicker.addNewPoint(QPointF(13, 0), image);

	auto ap = image->axisPoints();
	ap.type = DatapickerImage::GraphType::LnX;
	image->setAxisPoints(ap);

	DatapickerImageWidget w(nullptr);
	w.setImages({image});
	w.ui.sbPositionX1->setValue(0);
	w.ui.sbPositionY1->setValue(100);
	w.ui.sbPositionZ1->setValue(0);
	w.ui.sbPositionX2->setValue(0);
	w.ui.sbPositionY2->setValue(0);
	w.ui.sbPositionZ2->setValue(0);
	w.ui.sbPositionX3->setValue(100);
	w.ui.sbPositionY3->setValue(0);
	w.ui.sbPositionZ3->setValue(0);
	w.logicalPositionChanged();

	auto* curve = new DatapickerCurve(i18n("Curve"));
	curve->addDatasheet(image->axisPoints().type);
	datapicker.addChild(curve);

	datapicker.addNewPoint(QPointF(5, 6), curve); // updates the curve data
	VALUES_EQUAL(curve->posXColumn()->valueAt(0), 0.); // x start is zero, which is not valid therefore the result is 0
	VALUES_EQUAL(curve->posYColumn()->valueAt(0), 0.); // x start is zero, which is not valid therefore the result is 0

	QCOMPARE(w.ui.sbPositionX1->setValue(1), true);
	QCOMPARE(w.ui.sbPositionX2->setValue(1), true);
	w.ui.sbPositionX1->valueChanged(1); // axisPointsChanged will call updatePoint()

	// Value validated manually, not reverse calculated
	VALUES_EQUAL(curve->posXColumn()->valueAt(0), 2.51188635826);
	VALUES_EQUAL(curve->posYColumn()->valueAt(0), 60.);
}

// Test if setting curve points on the image result in correct values for lnY mapping
void DatapickerTest::logarithmicNaturalYMapping() {