Fix issue with observers.

src/main/org/insa/graphics/MainWindow.java

@@ -169,7 +169,6 @@ public class MainWindow extends JFrame {
                 }
 
                 spPanel.setEnabled(false);
-                launchShortestPathThread(spAlgorithm);
 
                 if (evt.isGraphicVisualizationEnabled()) {
                     spAlgorithm.addObserver(new ShortestPathGraphicObserver(drawing));
@@ -177,6 +176,8 @@ public class MainWindow extends JFrame {
                 if (evt.isTextualVisualizationEnabled()) {
                     spAlgorithm.addObserver(new ShortestPathTextObserver(printStream));
                 }
+
+                launchShortestPathThread(spAlgorithm);
             }
         });
         spPanel.setVisible(false);
@@ -285,6 +286,9 @@ public class MainWindow extends JFrame {
         threadTimer.stop();
         threadPanel.setVisible(false);
         currentThread.setThread(null);
+        if (spPanel.isVisible()) {
+            spPanel.setEnabled(true);
+        }
     }
 
     private void displayShortestPathSolution(ShortestPathSolution solution) {

src/main/org/insa/graphics/ShortestPathPanel.java

@@ -194,7 +194,7 @@ public class ShortestPathPanel extends JPanel {
 
             @Override
             public String toString() {
-                return "Non-private roads allowed for motorcars";
+                return "Only non-private roads allowed for motorcars";
             }
         } });
         arcFilterSelect.setBackground(Color.WHITE);

src/main/org/insa/graphics/drawing/components/BasicDrawing.java

@@ -154,6 +154,7 @@ public class BasicDrawing extends JPanel implements Drawing {
             this.points = points;
             this.origin = origin;
             this.destination = destination;
+            this.color = color;
         }
 
         @Override
@@ -217,7 +218,7 @@ public class BasicDrawing extends JPanel implements Drawing {
 
         @Override
         public void setWidth(int width) {
-            this.width = width;
+            this.width = Math.max(2, width);
         }
 
         @Override
@@ -228,7 +229,6 @@ public class BasicDrawing extends JPanel implements Drawing {
 
         @Override
         public void addPoint(Point point) {
-            this.width = 5;
             int x = BasicDrawing.this.projx(point.getLongitude()) - this.width / 2;
             int y = BasicDrawing.this.projy(point.getLatitude()) - this.width / 2;
             this.graphics.fillOval(x, y, this.width, this.width);

src/main/org/insa/graphics/drawing/components/MapZoomControls.java

@@ -1,5 +1,6 @@
 package org.insa.graphics.drawing.components;
 
+import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Cursor;
@@ -173,6 +174,8 @@ public class MapZoomControls {
         g.drawImage(zoomOut, xoffset, yoffset, observer);
         zoomOutRect.setBounds(xoffset, yoffset, DEFAULT_HEIGHT, DEFAULT_HEIGHT);
 
+        g.setStroke(new BasicStroke(1));
+
         // Draw ticks
         xoffset += DEFAULT_HEIGHT + 2;
         g.setColor(ZOOM_TICK_COLOR);