Implements events and controls reactivity.

src/main/java/ch/hepia/ui/MainWindowController.java

 package ch.hepia.ui;
 
+import ch.hepia.api.transport.Connection;
 import ch.hepia.api.transport.LinkAPI;
+import ch.hepia.api.transport.Section;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
+import javafx.scene.canvas.Canvas;
 import javafx.scene.control.Alert;
 import javafx.scene.control.ComboBox;
 import javafx.scene.control.Label;
+import javafx.scene.shape.Line;
+import javafx.stage.Stage;
 import org.json.JSONArray;
 
+import java.io.IOException;
+import java.lang.reflect.Array;
 import java.net.URL;
+import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.ResourceBundle;
 
 public class MainWindowController implements Initializable {
@@ -25,35 +35,79 @@ public class MainWindowController implements Initializable {
     @FXML
     private ComboBox<String> destinationComboBox;
 
-    @Override
-    public void initialize(URL url, ResourceBundle resourceBundle) {
-        currentJourneyLabel.setText("Vous n'avez prévu aucun voyage pour le moment.");
-        startStopLabel.setText(""); // No text should be visible when no journey has been selected.
-        LinkAPI transportApi = new LinkAPI();
+    @FXML
+    private Canvas connectionCanvas;
 
-        originComboBox.valueProperty().addListener(
-            (observable, oldValue, newValue) -> {
-                if (!newValue.isEmpty() && newValue.length() > 3){
-                    originComboBox.getItems().clear();
+    /**
+     * Shows a sad message when the API crashes.
+     */
+    private void showSadMessage(){
+        AlertUtils.dialog(Alert.AlertType.ERROR, "Erreur",
+            "Une erreur est survenue.",
+            "Impossible de contacter les services de transport Suisses.");
+    }
+
+    /**
+     * Searches stops that matches the query.
+     * @param newValue The stop name query.
+     * @param transportApi The API to connect to
+     * @param target The combo box where to put the results.
+     */
+    private void searchStops(String newValue, LinkAPI transportApi, ComboBox<String> target){
+        if (!newValue.isEmpty() && newValue.length() > 3 && !target.getItems().contains(newValue)){
             try {
                 JSONArray a = transportApi.getStations(newValue);
+                ArrayList<String> results = new ArrayList<>();
                 for (int i = 0; i < a.length(); i++){
-                            originComboBox.getItems().add(a.getJSONObject(i).getString("name"));
+                    results.add(a.getJSONObject(i).getString("name"));
+                }
+                target.getItems().clear();
+                target.getItems().addAll(results);
+                target.show();
+            } catch (IOException e) {
+                showSadMessage();
             }
-                    } catch (Exception e) {
-                        AlertUtils.dialog(
-                                Alert.AlertType.ERROR, "Erreur",
-                                "Une erreur est survenue.",
-                                "Impossible de contacter les services de transport Suisses.");
         }
     }
-            });
+
+    private void drawConnection(Connection connection, int x, int y){
+        List<Section> sections = connection.getSections();
+        for (int i = 0; i < sections.size(); i++){
+            connectionCanvas.getGraphicsContext2D().strokeLine(
+                    x + (800 / sections.size()) * i, y, 800 / sections.size(), y);
+        }
+    }
+
+    @Override
+    public void initialize(URL url, ResourceBundle resourceBundle) {
+        currentJourneyLabel.setText("Vous n'avez prévu aucun voyage pour le moment.");
+        startStopLabel.setText(""); // No text should be visible when no journey has been selected.
+        LinkAPI transportApi = new LinkAPI();
+
+        originComboBox.valueProperty().addListener(
+            (observable, oldValue, newValue) -> searchStops(newValue, transportApi, originComboBox)
+        );
 
         destinationComboBox.valueProperty().addListener(
             (observable, oldValue, newValue) -> {
-                if (!newValue.isEmpty() && !originComboBox.getValue().isEmpty()){
+                searchStops(newValue, transportApi, destinationComboBox);
+                if (destinationComboBox.getItems().contains(newValue) &&
+                        originComboBox.getItems().contains(originComboBox.getValue())){
+                    // Both are autofilled, plotting route
+                    try {
+                        JSONArray connections = transportApi.getConnections(
+                                originComboBox.getValue(), destinationComboBox.getValue());
+                        startStopLabel.setText(originComboBox.getValue() + " - " + destinationComboBox.getValue());
+                        for (int i = 0; i < connections.length(); i++){
+                            // Now iterating over connections
+                            Connection c = new Connection.ConnectionBuilder(connections.getJSONObject(i)).build();
+                            drawConnection(c, 30, 100 + 30 * i);
 
                         }
+                    } catch (IOException | ParseException e) {
+                        showSadMessage();
+                    }
+                }
             }
         );
     }

src/main/resources/fxml/MainWindow.fxml

 <?xml version="1.0" encoding="UTF-8"?>
 
+<?import javafx.scene.canvas.*?>
 <?import javafx.scene.text.*?>
 <?import javafx.scene.paint.*?>
 <?import javafx.scene.shape.*?>
@@ -50,6 +51,7 @@
                     </font>
                 </Label>
                 <Line endX="100.0" layoutX="115.0" layoutY="49.0" startX="-100.0" stroke="#4c7ba8" />
+            <Canvas id="connectionCanvas" fx:id="connectionCanvas" height="451.0" layoutX="15.0" layoutY="59.0" width="652.0" />
             </children>
         </Pane>
     </center>