Tentative d'ajout de la combinaison Ctrl + touche de zoom

(handler sur les touches raccourcis de l'interface donc ca ne marche pas encore, pas encore trouve l'astuce pour contourner ca)

src/render/render_opengl.cpp

@@ -665,6 +665,20 @@ void Render_opengl::keyPressEvent(QKeyEvent * event){
          */
         change_translate_y(-1*ctrl_factor);
 	break;
+    case Qt::Key_Plus:
+	/*
+         * Key 'plus' pressed.
+         */
+	if (ctrl_factor != 1)
+	    change_scale(1*ctrl_factor);
+	break;
+    case Qt::Key_Minus:
+	/*
+         * Key 'minus' pressed.
+         */
+	if (ctrl_factor != 1)
+	    change_scale(-1*ctrl_factor);
+	break;
     default:
 	/*
 	 * Unknow key pressed.

src/render/render_opengl.hpp

@@ -154,6 +154,11 @@ class Render_opengl : public QGLWidget, public Render
       * \brief Define the scrolling factor when CTRL key is pressed.
       */
      static const int _ctrl_scroll_factor = 10;
+
+     /*!
+      * \brief Define the scrolling factor when CTRL key is pressed.
+      */
+     static const int _ctrl_zoom_factor = 3;