feat: add zoom and canvas panning
This commit is contained in:
grayTerminal-sh
parent
13a391b449
commit
866a304f2f
2 changed files with 910 additions and 4 deletions
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@ -67,6 +67,17 @@ void investigation_graph_view_clear(
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InvestigationGraphView *graph_view
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);
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/**
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* @brief Réinitialise le zoom et la position du canvas.
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*
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* Le graphe emprunté reste associé à la vue.
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*
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* @param graph_view Vue graphique à recentrer.
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*/
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void investigation_graph_view_reset_view(
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InvestigationGraphView *graph_view
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);
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/**
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* @brief Libère la structure d'encapsulation de la vue.
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*
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@ -23,6 +23,12 @@
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#define INVESTIGATION_GRAPH_VIEW_ARROW_LENGTH 9.0
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#define INVESTIGATION_GRAPH_VIEW_ARROW_HALF_WIDTH 5.0
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#define INVESTIGATION_GRAPH_VIEW_MIN_ZOOM 0.25
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#define INVESTIGATION_GRAPH_VIEW_MAX_ZOOM 3.0
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#define INVESTIGATION_GRAPH_VIEW_SCROLL_ZOOM_SPEED 0.08
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#define INVESTIGATION_GRAPH_VIEW_MIN_SCROLL_FACTOR 0.50
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#define INVESTIGATION_GRAPH_VIEW_MAX_SCROLL_FACTOR 1.50
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/**
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* @brief Position privée d'une entité dans la vue.
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*/
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@ -42,9 +48,577 @@ struct InvestigationGraphView
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{
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GtkWidget *drawing_area;
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GtkGesture *zoom_gesture;
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GtkGesture *drag_gesture;
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GtkEventController *scroll_controller;
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GtkEventController *motion_controller;
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const InvestigationGraphModel *graph_model;
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double zoom;
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double offset_x;
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double offset_y;
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double zoom_gesture_start_zoom;
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double zoom_gesture_start_offset_x;
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double zoom_gesture_start_offset_y;
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double zoom_gesture_anchor_x;
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double zoom_gesture_anchor_y;
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double pointer_x;
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double pointer_y;
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double drag_start_x;
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double drag_start_y;
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double drag_origin_offset_x;
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double drag_origin_offset_y;
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gboolean pointer_position_valid;
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gboolean dragging;
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};
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/**
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* @brief Borne un facteur de zoom aux limites autorisées.
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*/
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static double investigation_graph_view_clamp_zoom(
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double zoom
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)
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{
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if (zoom < INVESTIGATION_GRAPH_VIEW_MIN_ZOOM)
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{
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return INVESTIGATION_GRAPH_VIEW_MIN_ZOOM;
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}
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if (zoom > INVESTIGATION_GRAPH_VIEW_MAX_ZOOM)
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{
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return INVESTIGATION_GRAPH_VIEW_MAX_ZOOM;
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}
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return zoom;
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}
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/**
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* @brief Applique un zoom en conservant un point d'écran immobile.
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*/
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static void investigation_graph_view_zoom_at_point(
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InvestigationGraphView *graph_view,
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double requested_zoom,
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double anchor_x,
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double anchor_y
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)
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{
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double previous_zoom =
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0.0;
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double logical_x =
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0.0;
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double logical_y =
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0.0;
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double new_zoom =
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0.0;
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if (graph_view == NULL ||
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graph_view->drawing_area == NULL)
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{
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return;
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}
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previous_zoom =
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graph_view->zoom;
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if (previous_zoom <= 0.0)
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{
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previous_zoom =
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1.0;
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}
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new_zoom =
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investigation_graph_view_clamp_zoom(
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requested_zoom
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);
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logical_x =
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(
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anchor_x -
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graph_view->offset_x
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) /
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previous_zoom;
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logical_y =
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(
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anchor_y -
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graph_view->offset_y
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) /
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previous_zoom;
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graph_view->zoom =
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new_zoom;
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graph_view->offset_x =
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anchor_x -
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(logical_x * new_zoom);
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graph_view->offset_y =
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anchor_y -
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(logical_y * new_zoom);
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gtk_widget_queue_draw(
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graph_view->drawing_area
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);
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}
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/**
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* @brief Mémorise la dernière position connue du pointeur.
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*/
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static void investigation_graph_view_on_pointer_motion(
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GtkEventControllerMotion *controller,
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double x,
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double y,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
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(void) controller;
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if (graph_view == NULL)
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{
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return;
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}
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graph_view->pointer_x =
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x;
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graph_view->pointer_y =
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y;
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graph_view->pointer_position_valid =
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TRUE;
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}
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/**
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* @brief Oublie la position du pointeur lorsqu'il quitte le canvas.
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*/
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static void investigation_graph_view_on_pointer_leave(
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GtkEventControllerMotion *controller,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
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(void) controller;
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if (graph_view == NULL)
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{
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return;
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}
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graph_view->pointer_position_valid =
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FALSE;
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}
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/**
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* @brief Mémorise l'état initial d'un pincement.
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*/
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static void investigation_graph_view_on_zoom_begin(
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GtkGesture *gesture,
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GdkEventSequence *sequence,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
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double anchor_x =
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0.0;
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double anchor_y =
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0.0;
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gboolean center_available =
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FALSE;
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(void) sequence;
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if (graph_view == NULL ||
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graph_view->drawing_area == NULL)
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{
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return;
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}
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center_available =
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gtk_gesture_get_bounding_box_center(
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gesture,
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&anchor_x,
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&anchor_y
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);
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if (!center_available)
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{
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anchor_x =
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(double) gtk_widget_get_width(
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graph_view->drawing_area
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) /
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2.0;
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anchor_y =
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(double) gtk_widget_get_height(
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graph_view->drawing_area
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) /
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2.0;
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}
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graph_view->zoom_gesture_start_zoom =
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graph_view->zoom;
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graph_view->zoom_gesture_start_offset_x =
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graph_view->offset_x;
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graph_view->zoom_gesture_start_offset_y =
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graph_view->offset_y;
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graph_view->zoom_gesture_anchor_x =
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anchor_x;
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graph_view->zoom_gesture_anchor_y =
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anchor_y;
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}
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/**
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* @brief Applique le facteur cumulé transmis par GtkGestureZoom.
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*/
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static void investigation_graph_view_on_scale_changed(
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GtkGestureZoom *gesture,
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double scale,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
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double start_zoom =
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0.0;
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double new_zoom =
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0.0;
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double logical_x =
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0.0;
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double logical_y =
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0.0;
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(void) gesture;
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if (graph_view == NULL ||
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graph_view->drawing_area == NULL ||
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scale <= 0.0)
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{
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return;
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}
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start_zoom =
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graph_view->zoom_gesture_start_zoom;
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if (start_zoom <= 0.0)
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{
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start_zoom =
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1.0;
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}
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new_zoom =
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investigation_graph_view_clamp_zoom(
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start_zoom * scale
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);
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logical_x =
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(
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graph_view->zoom_gesture_anchor_x -
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graph_view->zoom_gesture_start_offset_x
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) /
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start_zoom;
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logical_y =
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(
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graph_view->zoom_gesture_anchor_y -
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graph_view->zoom_gesture_start_offset_y
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) /
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start_zoom;
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graph_view->zoom =
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new_zoom;
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graph_view->offset_x =
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graph_view->zoom_gesture_anchor_x -
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(logical_x * new_zoom);
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graph_view->offset_y =
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graph_view->zoom_gesture_anchor_y -
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(logical_y * new_zoom);
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gtk_widget_queue_draw(
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graph_view->drawing_area
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);
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}
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/**
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* @brief Gère Ctrl + défilement comme solution de zoom de secours.
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*/
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static gboolean investigation_graph_view_on_scroll(
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GtkEventControllerScroll *controller,
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double delta_x,
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double delta_y,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
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GdkModifierType modifier_state =
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0;
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double anchor_x =
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0.0;
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double anchor_y =
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0.0;
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double zoom_factor =
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1.0;
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(void) delta_x;
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if (graph_view == NULL ||
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graph_view->drawing_area == NULL ||
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delta_y == 0.0)
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{
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return FALSE;
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}
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modifier_state =
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gtk_event_controller_get_current_event_state(
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GTK_EVENT_CONTROLLER(
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controller
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)
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);
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if ((modifier_state & GDK_CONTROL_MASK) == 0)
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{
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return FALSE;
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}
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if (graph_view->pointer_position_valid)
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{
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anchor_x =
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graph_view->pointer_x;
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anchor_y =
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graph_view->pointer_y;
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}
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else
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{
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anchor_x =
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(double) gtk_widget_get_width(
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graph_view->drawing_area
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) /
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2.0;
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anchor_y =
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(double) gtk_widget_get_height(
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graph_view->drawing_area
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) /
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2.0;
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}
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zoom_factor =
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1.0 -
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(
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delta_y *
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INVESTIGATION_GRAPH_VIEW_SCROLL_ZOOM_SPEED
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);
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if (zoom_factor <
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INVESTIGATION_GRAPH_VIEW_MIN_SCROLL_FACTOR)
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{
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zoom_factor =
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INVESTIGATION_GRAPH_VIEW_MIN_SCROLL_FACTOR;
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}
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if (zoom_factor >
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INVESTIGATION_GRAPH_VIEW_MAX_SCROLL_FACTOR)
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{
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zoom_factor =
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INVESTIGATION_GRAPH_VIEW_MAX_SCROLL_FACTOR;
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}
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investigation_graph_view_zoom_at_point(
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graph_view,
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graph_view->zoom * zoom_factor,
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anchor_x,
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anchor_y
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);
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return TRUE;
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}
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/**
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* @brief Commence le déplacement de l'ensemble du canvas.
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*/
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static void investigation_graph_view_on_drag_begin(
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GtkGestureDrag *gesture,
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double start_x,
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double start_y,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
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GdkModifierType modifier_state =
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0;
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if (graph_view == NULL ||
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graph_view->drawing_area == NULL)
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{
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return;
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}
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modifier_state =
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gtk_event_controller_get_current_event_state(
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GTK_EVENT_CONTROLLER(
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gesture
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)
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);
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if ((modifier_state & GDK_SHIFT_MASK) == 0)
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{
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graph_view->dragging =
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FALSE;
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gtk_gesture_set_state(
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GTK_GESTURE(
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gesture
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),
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GTK_EVENT_SEQUENCE_DENIED
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);
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return;
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}
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gtk_gesture_set_state(
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GTK_GESTURE(
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gesture
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),
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GTK_EVENT_SEQUENCE_CLAIMED
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);
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graph_view->drag_start_x =
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start_x;
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graph_view->drag_start_y =
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start_y;
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graph_view->drag_origin_offset_x =
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graph_view->offset_x;
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graph_view->drag_origin_offset_y =
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graph_view->offset_y;
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graph_view->dragging =
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TRUE;
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gtk_widget_set_cursor_from_name(
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graph_view->drawing_area,
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"grabbing"
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);
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}
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/**
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* @brief Déplace le canvas selon le décalage cumulé du geste.
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*/
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static void investigation_graph_view_on_drag_update(
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GtkGestureDrag *gesture,
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double offset_x,
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double offset_y,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
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(void) gesture;
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if (graph_view == NULL ||
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graph_view->drawing_area == NULL ||
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!graph_view->dragging)
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{
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return;
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}
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graph_view->offset_x =
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graph_view->drag_origin_offset_x +
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offset_x;
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graph_view->offset_y =
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graph_view->drag_origin_offset_y +
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offset_y;
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gtk_widget_queue_draw(
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graph_view->drawing_area
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);
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}
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/**
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* @brief Termine le déplacement du canvas.
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*/
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static void investigation_graph_view_on_drag_end(
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GtkGestureDrag *gesture,
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double offset_x,
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double offset_y,
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gpointer user_data
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)
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{
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InvestigationGraphView *graph_view =
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user_data;
|
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(void) gesture;
|
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|
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if (graph_view == NULL ||
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graph_view->drawing_area == NULL)
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{
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return;
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}
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if (graph_view->dragging)
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{
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graph_view->offset_x =
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graph_view->drag_origin_offset_x +
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offset_x;
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graph_view->offset_y =
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graph_view->drag_origin_offset_y +
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offset_y;
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}
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graph_view->dragging =
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FALSE;
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|
||||
gtk_widget_set_cursor_from_name(
|
||||
graph_view->drawing_area,
|
||||
"default"
|
||||
);
|
||||
|
||||
gtk_widget_queue_draw(
|
||||
graph_view->drawing_area
|
||||
);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Retourne le texte principal d'une entité.
|
||||
*
|
||||
|
|
@ -1441,6 +2015,26 @@ static void investigation_graph_view_draw(
|
|||
goto draw_error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Les coordonnées de disposition restent exprimées dans l'espace logique
|
||||
* du graphe. Cairo applique ensuite la navigation de la vue.
|
||||
*/
|
||||
cairo_save(
|
||||
cairo_context
|
||||
);
|
||||
|
||||
cairo_translate(
|
||||
cairo_context,
|
||||
graph_view->offset_x,
|
||||
graph_view->offset_y
|
||||
);
|
||||
|
||||
cairo_scale(
|
||||
cairo_context,
|
||||
graph_view->zoom,
|
||||
graph_view->zoom
|
||||
);
|
||||
|
||||
/*
|
||||
* Les relations sont dessinées en premier afin que les nœuds restent
|
||||
* lisibles au premier plan.
|
||||
|
|
@ -1470,6 +2064,10 @@ static void investigation_graph_view_draw(
|
|||
);
|
||||
}
|
||||
|
||||
cairo_restore(
|
||||
cairo_context
|
||||
);
|
||||
|
||||
goto cleanup;
|
||||
|
||||
draw_error:
|
||||
|
|
@ -1586,6 +2184,173 @@ InvestigationGraphView *investigation_graph_view_new(void)
|
|||
NULL
|
||||
);
|
||||
|
||||
graph_view->zoom_gesture =
|
||||
gtk_gesture_zoom_new();
|
||||
|
||||
graph_view->drag_gesture =
|
||||
gtk_gesture_drag_new();
|
||||
|
||||
graph_view->scroll_controller =
|
||||
gtk_event_controller_scroll_new(
|
||||
GTK_EVENT_CONTROLLER_SCROLL_VERTICAL
|
||||
);
|
||||
|
||||
graph_view->motion_controller =
|
||||
gtk_event_controller_motion_new();
|
||||
|
||||
if (graph_view->zoom_gesture == NULL ||
|
||||
graph_view->drag_gesture == NULL ||
|
||||
graph_view->scroll_controller == NULL ||
|
||||
graph_view->motion_controller == NULL)
|
||||
{
|
||||
investigation_graph_view_free(
|
||||
graph_view
|
||||
);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->zoom_gesture,
|
||||
"begin",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_zoom_begin
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->zoom_gesture,
|
||||
"scale-changed",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_scale_changed
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
gtk_gesture_single_set_button(
|
||||
GTK_GESTURE_SINGLE(
|
||||
graph_view->drag_gesture
|
||||
),
|
||||
GDK_BUTTON_PRIMARY
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->drag_gesture,
|
||||
"drag-begin",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_drag_begin
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->drag_gesture,
|
||||
"drag-update",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_drag_update
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->drag_gesture,
|
||||
"drag-end",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_drag_end
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->scroll_controller,
|
||||
"scroll",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_scroll
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->motion_controller,
|
||||
"enter",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_pointer_motion
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->motion_controller,
|
||||
"motion",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_pointer_motion
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
g_signal_connect(
|
||||
graph_view->motion_controller,
|
||||
"leave",
|
||||
G_CALLBACK(
|
||||
investigation_graph_view_on_pointer_leave
|
||||
),
|
||||
graph_view
|
||||
);
|
||||
|
||||
gtk_widget_add_controller(
|
||||
graph_view->drawing_area,
|
||||
GTK_EVENT_CONTROLLER(
|
||||
graph_view->zoom_gesture
|
||||
)
|
||||
);
|
||||
|
||||
gtk_widget_add_controller(
|
||||
graph_view->drawing_area,
|
||||
GTK_EVENT_CONTROLLER(
|
||||
graph_view->drag_gesture
|
||||
)
|
||||
);
|
||||
|
||||
gtk_widget_add_controller(
|
||||
graph_view->drawing_area,
|
||||
graph_view->scroll_controller
|
||||
);
|
||||
|
||||
gtk_widget_add_controller(
|
||||
graph_view->drawing_area,
|
||||
graph_view->motion_controller
|
||||
);
|
||||
|
||||
graph_view->zoom =
|
||||
1.0;
|
||||
|
||||
graph_view->offset_x =
|
||||
0.0;
|
||||
|
||||
graph_view->offset_y =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_start_x =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_start_y =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_origin_offset_x =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_origin_offset_y =
|
||||
0.0;
|
||||
|
||||
graph_view->dragging =
|
||||
FALSE;
|
||||
|
||||
gtk_widget_set_cursor_from_name(
|
||||
graph_view->drawing_area,
|
||||
"default"
|
||||
);
|
||||
|
||||
return graph_view;
|
||||
}
|
||||
|
||||
|
|
@ -1614,8 +2379,8 @@ void investigation_graph_view_set_graph(
|
|||
graph_view->graph_model =
|
||||
graph_model;
|
||||
|
||||
gtk_widget_queue_draw(
|
||||
graph_view->drawing_area
|
||||
investigation_graph_view_reset_view(
|
||||
graph_view
|
||||
);
|
||||
}
|
||||
|
||||
|
|
@ -1631,11 +2396,72 @@ void investigation_graph_view_clear(
|
|||
graph_view->graph_model =
|
||||
NULL;
|
||||
|
||||
gtk_widget_queue_draw(
|
||||
graph_view->drawing_area
|
||||
investigation_graph_view_reset_view(
|
||||
graph_view
|
||||
);
|
||||
}
|
||||
|
||||
void investigation_graph_view_reset_view(
|
||||
InvestigationGraphView *graph_view
|
||||
)
|
||||
{
|
||||
if (graph_view == NULL)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
graph_view->zoom =
|
||||
1.0;
|
||||
|
||||
graph_view->offset_x =
|
||||
0.0;
|
||||
|
||||
graph_view->offset_y =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_start_x =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_start_y =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_origin_offset_x =
|
||||
0.0;
|
||||
|
||||
graph_view->drag_origin_offset_y =
|
||||
0.0;
|
||||
|
||||
graph_view->zoom_gesture_start_zoom =
|
||||
1.0;
|
||||
|
||||
graph_view->zoom_gesture_start_offset_x =
|
||||
0.0;
|
||||
|
||||
graph_view->zoom_gesture_start_offset_y =
|
||||
0.0;
|
||||
|
||||
graph_view->zoom_gesture_anchor_x =
|
||||
0.0;
|
||||
|
||||
graph_view->zoom_gesture_anchor_y =
|
||||
0.0;
|
||||
|
||||
graph_view->dragging =
|
||||
FALSE;
|
||||
|
||||
if (graph_view->drawing_area != NULL)
|
||||
{
|
||||
gtk_widget_set_cursor_from_name(
|
||||
graph_view->drawing_area,
|
||||
"default"
|
||||
);
|
||||
|
||||
gtk_widget_queue_draw(
|
||||
graph_view->drawing_area
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
void investigation_graph_view_free(
|
||||
InvestigationGraphView *graph_view
|
||||
)
|
||||
|
|
@ -1658,6 +2484,74 @@ void investigation_graph_view_free(
|
|||
NULL,
|
||||
NULL
|
||||
);
|
||||
|
||||
if (graph_view->zoom_gesture != NULL)
|
||||
{
|
||||
g_signal_handlers_disconnect_by_data(
|
||||
graph_view->zoom_gesture,
|
||||
graph_view
|
||||
);
|
||||
|
||||
gtk_widget_remove_controller(
|
||||
graph_view->drawing_area,
|
||||
GTK_EVENT_CONTROLLER(
|
||||
graph_view->zoom_gesture
|
||||
)
|
||||
);
|
||||
|
||||
graph_view->zoom_gesture =
|
||||
NULL;
|
||||
}
|
||||
|
||||
if (graph_view->drag_gesture != NULL)
|
||||
{
|
||||
g_signal_handlers_disconnect_by_data(
|
||||
graph_view->drag_gesture,
|
||||
graph_view
|
||||
);
|
||||
|
||||
gtk_widget_remove_controller(
|
||||
graph_view->drawing_area,
|
||||
GTK_EVENT_CONTROLLER(
|
||||
graph_view->drag_gesture
|
||||
)
|
||||
);
|
||||
|
||||
graph_view->drag_gesture =
|
||||
NULL;
|
||||
}
|
||||
|
||||
if (graph_view->scroll_controller != NULL)
|
||||
{
|
||||
g_signal_handlers_disconnect_by_data(
|
||||
graph_view->scroll_controller,
|
||||
graph_view
|
||||
);
|
||||
|
||||
gtk_widget_remove_controller(
|
||||
graph_view->drawing_area,
|
||||
graph_view->scroll_controller
|
||||
);
|
||||
|
||||
graph_view->scroll_controller =
|
||||
NULL;
|
||||
}
|
||||
|
||||
if (graph_view->motion_controller != NULL)
|
||||
{
|
||||
g_signal_handlers_disconnect_by_data(
|
||||
graph_view->motion_controller,
|
||||
graph_view
|
||||
);
|
||||
|
||||
gtk_widget_remove_controller(
|
||||
graph_view->drawing_area,
|
||||
graph_view->motion_controller
|
||||
);
|
||||
|
||||
graph_view->motion_controller =
|
||||
NULL;
|
||||
}
|
||||
}
|
||||
|
||||
graph_view->drawing_area =
|
||||
|
|
@ -1667,3 +2561,4 @@ void investigation_graph_view_free(
|
|||
graph_view
|
||||
);
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue