Method linearMapping

tests/backend/Datapicker/DatapickerTest.cpp:454–491

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

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

	// Set reference points
	datapicker.addNewPoint(QPointF(0, 1), image);
	datapicker.addNewPoint(QPointF(0, 0), image);
	datapicker.addNewPoint(QPointF(1, 0), image);

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

	DatapickerImageWidget w(nullptr);
	w.setImages({image});
	w.ui.sbPositionX1->setValue(0);
	w.ui.sbPositionY1->setValue(10);
	w.ui.sbPositionZ1->setValue(0);
	w.ui.sbPositionX2->setValue(0);
	w.ui.sbPositionY2->setValue(0);
	w.ui.sbPositionZ2->setValue(0);
	w.ui.sbPositionX3->setValue(10);
	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(0.5, 0.5), curve); // updates the curve data
	VALUES_EQUAL(curve->posXColumn()->valueAt(0), 5.);
	VALUES_EQUAL(curve->posYColumn()->valueAt(0), 5.);

	datapicker.addNewPoint(QPointF(0.7, 0.65), curve); // updates the curve data
	VALUES_EQUAL(curve->posXColumn()->valueAt(1), 7.);
	VALUES_EQUAL(curve->posYColumn()->valueAt(1), 6.5);
}

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