Kernel: JavaFX editor. Added circle location computation method.

Issue-Ref: 3815
Issue-Url: https://af3-developer.fortiss.org/issues/3815


Signed-off-by: Florian Hoelzl <hoelzl@fortiss.org>

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/utils/.ratings

@@ -5,7 +5,7 @@ DragAndDropBaseUtils.java d375377f9124f6113b2a295e6b0e09ac8966e564 GREEN
 EllipseLayoutUIUtils.java 4dd9dbd96a45e8c455c019caa19e4a50f18336af GREEN
 FontUtils.java a167a05bdaa8da9853705cc5134f30f6d81bc9f2 GREEN
 GCStateManager.java 983973a92376b5c757c1253b32e33d0666ccdf7b GREEN
-LWFXEditorUtils.java af4bb6efdc13e52996f6e23b95217e8b5947b478 YELLOW
+LWFXEditorUtils.java c628e79fa43c1be8a7b87ee90db6e7264904eafc YELLOW
 LayoutDataUIUtils.java c85886ac313a6efb122532218eb134047ffd6631 GREEN
 PropertiesViewUtils.java d345b4501c4092228edf1c98e0189317d53aaf22 GREEN
 RectangleLayoutUIUtils.java ef4b872bb5b4a51174e9a29d9ef05e7cb3bff3a1 GREEN

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/utils/LWFXEditorUtils.java

@@ -15,9 +15,14 @@
 +--------------------------------------------------------------------------*/
 package org.fortiss.tooling.base.ui.utils;
 
+import static java.lang.Math.atan2;
+import static java.lang.Math.cos;
+import static java.lang.Math.sin;
+
 import org.eclipse.systemfocus.kernel.common.ui.javafx.lwfxef.DiagramCoordinate;
 import org.fortiss.tooling.base.model.layout.EOrientation;
 
+import javafx.geometry.Point2D;
 import javafx.geometry.Rectangle2D;
 import javafx.geometry.Side;
 
@@ -79,6 +84,21 @@ public final class LWFXEditorUtils {
 		return null;
 	}
 
+	/**
+	 * Returns the point on a circle centered in the current bounds intersecting with a line between
+	 * the center point and the given point.
+	 */
+	public static DiagramCoordinate computeLinkToCircleLocation(Rectangle2D bounds,
+			Point2D target) {
+		double sx = bounds.getMinX() + bounds.getWidth() / 2;
+		double sy = bounds.getMinY() + bounds.getHeight() / 2;
+
+		double a = atan2(target.getY() - sy, target.getX() - sx);
+		double nx = sx + cos(a) * (bounds.getWidth() / 2 - 1);
+		double ny = sy + sin(a) * (bounds.getHeight() / 2 - 1);
+		return new DiagramCoordinate(nx, ny);
+	}
+
 	/** Constructor. */
 	private LWFXEditorUtils() {
 		// prevent instantiation