core/easingcurve: add EasingCurve type

src/core/easingcurve.cpp

@@ -0,0 +1,33 @@
+#include "easingcurve.hpp"
+#include <utility>
+
+#include <qeasingcurve.h>
+#include <qpoint.h>
+#include <qrect.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+
+qreal EasingCurve::valueAt(qreal x) const { return this->mCurve.valueForProgress(x); }
+
+qreal EasingCurve::interpolate(qreal x, qreal a, qreal b) const {
+	return a + (b - a) * this->valueAt(x);
+}
+
+QPointF EasingCurve::interpolate(qreal x, const QPointF& a, const QPointF& b) const {
+	return QPointF(this->interpolate(x, a.x(), b.x()), this->interpolate(x, a.y(), b.y()));
+}
+
+QRectF EasingCurve::interpolate(qreal x, const QRectF& a, const QRectF& b) const {
+	return QRectF(
+	    this->interpolate(x, a.topLeft(), b.topLeft()),
+	    this->interpolate(x, a.bottomRight(), b.bottomRight())
+	);
+}
+
+QEasingCurve EasingCurve::curve() const { return this->mCurve; }
+
+void EasingCurve::setCurve(QEasingCurve curve) {
+	if (this->mCurve == curve) return;
+	this->mCurve = std::move(curve);
+	emit this->curveChanged();
+}