Adds Angle calculation and shows the right LinkToolTips

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/view/VisualisationInteractor.java

@@ -7,7 +7,6 @@ import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseMotionListener;
-
 import java.util.LinkedList;
 
 import javax.swing.JMenu;
@@ -31,6 +30,7 @@ import de.tu_darmstadt.tk.SmartHomeNetworkSim.view.popups.ConnectionCreationDial
 import de.tu_darmstadt.tk.SmartHomeNetworkSim.view.popups.LinkCreationDialog;
 import de.tu_darmstadt.tk.SmartHomeNetworkSim.view.popups.SmartDeviceCreationPopUp;
 import de.tu_darmstadt.tk.SmartHomeNetworkSim.view.util.LinkToolTip;
+import de.tu_darmstadt.tk.SmartHomeNetworkSim.view.util.Utility;
 
 /**
  * Listener which detects User Interaction with the {@link VisualisationPanel},
@@ -607,7 +607,7 @@ public class VisualisationInteractor implements MouseInputListener,
 		 * Check Hover on Link
 		 */
 		if(config.isShowLinkToolTips())
-			l = checkHoverOnLink(e.getX(),e.getY());
+			l = getLinkVisualizationAtPosition(e.getX(),e.getY());
 		if(l != null){
 			if(l != toolTip.getLink() || !toolTip.isEnabled()){
 				toolTip.setText("Link "+l.getName());
@@ -626,7 +626,7 @@ public class VisualisationInteractor implements MouseInputListener,
 		}
 	}
 
-	private Link checkHoverOnLink(int x, int y) {
+	private Link getLinkVisualizationAtPosition(int x, int y) {
 		// Check is device is inside visualization radius
 		/**
 		 * Radius of the device
@@ -644,11 +644,37 @@ public class VisualisationInteractor implements MouseInputListener,
 				// On which part of Ring ?
 				//Outside of device ?
 				int realDistance = (int)Math.round(Math.sqrt((d.getX() - x)*(d.getX() - x)+(d.getY() - y)*(d.getY() - y)));
-				if (realDistance > smallRadius && realDistance <= radius) {
-					if(!d.getLinks().isEmpty())
-						return d.getLinks().get(0);
-					//TODO: +Link Detection & Radius
-					
+				if (realDistance > smallRadius && realDistance <= radius && !d.getLinks().isEmpty()) {
+					/**
+					 * Angle of this point. Counterclockwise, starting at 3 o' clock position
+					 */
+					float angle = Utility.getAngle(d.getX(), d.getY(), x, y);
+					/**
+					 * Number of Links in the Model
+					 */
+					int numberOfLinks = controller.getLinks().size();
+					/**
+					 * Angle per Link in "linkSlice degrees"
+					 */
+					double linkSlice = Math.min(360.0 / numberOfLinks,90.0);
+					/**
+					 * calculate the number of the link
+					 */
+					int linkNumber = (int) Math.floor(angle / linkSlice);
+					/**
+					 * Return if, there are not so many link
+					 */
+					if(linkNumber>=numberOfLinks)
+						return null;
+					/**
+					 * Link, which would be at this connection
+					 */
+					Link linkAtPosition = (Link) controller.getLinks().toArray()[linkNumber];
+					/**
+					 * Return link, if smartDevice contains it
+					 */
+					if(d.getLinks().contains(linkAtPosition))
+						return linkAtPosition;
 				}
 			}
 		}

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/view/VisualisationPanel.java

@@ -174,10 +174,6 @@ public class VisualisationPanel extends JPanel implements Observer {
 		 * Map of links to Colors and position of the Color
 		 */
 		HashMap<Link, Pair<Integer,Color>> linkColors = null;
-		/**
-		 * Dimension in pixels of the link ring
-		 */
-		int linkDim = 6;
 		
 		if(config.isShowLinks()){
 			linkColors = new HashMap<Link, Pair<Integer,Color>>();
@@ -246,8 +242,8 @@ public class VisualisationPanel extends JPanel implements Observer {
 					Pair<Integer, Color> linkPos = linkColors.get(l);
 					if(linkPos==null)continue;//Skip Links, which are not in the model
 					g.setColor(linkPos.getRight());
-					g.fillArc(x - config.getDeviceVisualizationRadius() - linkDim, y - config.getDeviceVisualizationRadius() - linkDim,
-							2 * config.getDeviceVisualizationRadius() - 1 + 2 * linkDim, 2 * config.getDeviceVisualizationRadius() - 1 + 2*linkDim,
+					g.fillArc(x - config.getDeviceVisualizationRadius() - config.getLinkRadius(), y - config.getDeviceVisualizationRadius() - config.getLinkRadius(),
+							2 * config.getDeviceVisualizationRadius() - 1 + 2 * config.getLinkRadius(), 2 * config.getDeviceVisualizationRadius() - 1 + 2*config.getLinkRadius(),
 							(int)Math.round(linkPos.getLeft()*linkSlice), (int)Math.ceil(linkSlice));
 				}
 			
@@ -272,7 +268,7 @@ public class VisualisationPanel extends JPanel implements Observer {
 			if(config.isShowSmartDeviceNames())
 				g.drawString(s.getName(),
 					x - g.getFontMetrics().stringWidth(s.getName()) / 2, y
-							+ config.getDeviceVisualizationRadius() + 11 + (config.isShowLinks()?linkDim:0));
+							+ config.getDeviceVisualizationRadius() + 11 + (config.isShowLinks()?config.getLinkRadius():0));
 		}
 	}
 	

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/view/util/Utility.java

@@ -78,4 +78,23 @@ public class Utility {
 			}
 		}
 	}
+	/**
+	 * Returns the anti clockwise angle between a vector pointing right and a vector pointing to the point. 0° starts at 3o'clock.
+	 *
+	 * @param x start position x
+	 * @param y start position y
+	 * @param x_target target x position
+	 * @param y_target target y position
+	 * @return angle in degrees
+	 */
+	public static float getAngle(int x, int y, int x_target, int y_target) {
+	    float angle = (float) Math.toDegrees(Math.atan2(y_target - y, x_target - x));
+
+	    if(angle <= 0){
+	        angle += 360;
+	    }
+	    
+	    // Anti clock wise
+	    return 360-angle;
+	}
 }