fixes eclipse-efx#163

modules/ui/org.eclipse.fx.ui.animation/src/main/java/org/eclipse/fx/ui/animation/DoublePropertyTransition.java

@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * Copyright (c) 2017 BestSolution.at and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Tom Schindl<[email protected]> - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.fx.ui.animation;
+
+import javafx.animation.Transition;
+import javafx.beans.property.DoubleProperty;
+import javafx.util.Duration;
+
+/**
+ * Transition updating a double property
+ */
+public class DoublePropertyTransition extends Transition {
+	private final DoubleProperty p;
+	private double from;
+	private double delta;
+
+	/**
+	 * Create a new transition
+	 * 
+	 * @param p
+	 *            the double property to update
+	 * @param duration
+	 *            the duration
+	 * @param from
+	 *            the start value
+	 * @param to
+	 *            the end value
+	 */
+	public DoublePropertyTransition(DoubleProperty p, Duration duration, double from, double to) {
+		this.p = p;
+		setCycleDuration(duration);
+		this.delta = to - from;
+	}
+
+	@Override
+	protected void interpolate(double frac) {
+		this.p.set(this.from + this.delta * frac);
+	}
+
+}