p/logdiag
1
1
Fork 0
Code Issues Pull Requests Releases 4 Wiki Activity

Highlight symbol terminals on mouse hover.

Browse Source
This commit is contained in:
Přemysl Eric Janouch 2011-01-09 04:50:58 +01:00
parent f12df021f7
commit 61ae34236a
1 changed files with 114 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

114
src/ld-canvas.c
View File

@ -46,6 +46,11 @@
/* Tolerance on all sides of symbols for strokes. */
#define SYMBOL_CLIP_TOLERANCE 5
/* Size of a highlighted terminal. */
#define TERMINAL_RADIUS 5
/* Tolerance around terminal points. */
#define TERMINAL_HOVER_TOLERANCE 8
/*
* OperationEnd:
*
@ -73,6 +78,7 @@ enum
COLOR_GRID,
COLOR_OBJECT,
COLOR_SELECTION,
COLOR_TERMINAL,
COLOR_COUNT
};
@ -112,6 +118,9 @@ struct _LdCanvasPrivate
gdouble y;
gdouble zoom;
LdPoint terminal;
gboolean terminal_highlighted;
gint operation;
union
{
@ -200,8 +209,10 @@ static gboolean get_object_area (LdCanvas *self, LdDiagramObject *object,
LdRectangle *rect);
static gboolean object_hit_test (LdCanvas *self, LdDiagramObject *object,
gdouble x, gdouble y);
static void check_terminals (LdCanvas *self, gdouble x, gdouble y);
static void queue_draw (LdCanvas *self, LdRectangle *rect);
static void queue_object_draw (LdCanvas *self, LdDiagramObject *object);
static void queue_terminal_draw (LdCanvas *self, LdPoint *terminal);
static void ld_canvas_real_cancel_operation (LdCanvas *self);
static void ld_canvas_add_object_end (LdCanvas *self);
@ -210,6 +221,7 @@ static gboolean on_expose_event (GtkWidget *widget, GdkEventExpose *event,
gpointer user_data);
static void draw_grid (GtkWidget *widget, DrawData *data);
static void draw_diagram (GtkWidget *widget, DrawData *data);
static void draw_terminal (GtkWidget *widget, DrawData *data);
static void draw_object (LdDiagramObject *diagram_object, DrawData *data);
static void draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data);
@ -302,6 +314,7 @@ ld_canvas_init (LdCanvas *self)
ld_canvas_color_set (COLOR_GET (self, COLOR_GRID), 0.5, 0.5, 0.5, 1);
ld_canvas_color_set (COLOR_GET (self, COLOR_OBJECT), 0, 0, 0, 1);
ld_canvas_color_set (COLOR_GET (self, COLOR_SELECTION), 0, 0, 1, 1);
ld_canvas_color_set (COLOR_GET (self, COLOR_TERMINAL), 1, 0.5, 0.5, 1);
g_signal_connect (self, "size-allocate",
G_CALLBACK (on_size_allocate), NULL);
@ -918,6 +931,72 @@ object_hit_test (LdCanvas *self, LdDiagramObject *object, gdouble x, gdouble y)
return ld_rectangle_contains (&rect, x, y);
}
static void
check_terminals (LdCanvas *self, gdouble x, gdouble y)
{
GSList *objects, *iter;
LdDiagramSymbol *closest_symbol = NULL;
gdouble closest_distance = TERMINAL_HOVER_TOLERANCE;
LdPoint closest_terminal;
objects = (GSList *) ld_diagram_get_objects (self->priv->diagram);
for (iter = objects; iter; iter = g_slist_next (iter))
{
LdDiagramObject *diagram_object;
gdouble object_x, object_y;
LdDiagramSymbol *diagram_symbol;
LdSymbol *symbol;
const LdPointArray *terminals;
gint i;
if (!LD_IS_DIAGRAM_SYMBOL (iter->data))
continue;
diagram_symbol = LD_DIAGRAM_SYMBOL (iter->data);
symbol = resolve_diagram_symbol (self, diagram_symbol);
if (!symbol)
continue;
diagram_object = LD_DIAGRAM_OBJECT (iter->data);
object_x = ld_diagram_object_get_x (diagram_object);
object_y = ld_diagram_object_get_y (diagram_object);
terminals = ld_symbol_get_terminals (symbol);
for (i = 0; i < terminals->num_points; i++)
{
LdPoint cur_term;
gdouble distance;
cur_term = terminals->points[i];
cur_term.x += object_x;
cur_term.y += object_y;
ld_canvas_diagram_to_widget_coords (self,
cur_term.x, cur_term.y, &cur_term.x, &cur_term.y);
distance = ld_point_distance (&cur_term, x, y);
if (distance <= closest_distance)
{
closest_symbol = diagram_symbol;
closest_distance = distance;
closest_terminal = cur_term;
}
}
}
if (self->priv->terminal_highlighted)
queue_terminal_draw (self, &self->priv->terminal);
if (closest_symbol)
{
self->priv->terminal_highlighted = TRUE;
self->priv->terminal = closest_terminal;
queue_terminal_draw (self, &closest_terminal);
}
else
self->priv->terminal_highlighted = FALSE;
}
static void
queue_draw (LdCanvas *self, LdRectangle *rect)
{
@ -942,6 +1021,18 @@ queue_object_draw (LdCanvas *self, LdDiagramObject *object)
}
}
static void
queue_terminal_draw (LdCanvas *self, LdPoint *terminal)
{
LdRectangle rect;
rect.x = terminal->x - TERMINAL_RADIUS;
rect.y = terminal->y - TERMINAL_RADIUS;
rect.width = 2 * TERMINAL_RADIUS;
rect.height = 2 * TERMINAL_RADIUS;
queue_draw (self, &rect);
}
static gboolean
on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data)
{
@ -960,6 +1051,9 @@ on_motion_notify (GtkWidget *widget, GdkEventMotion *event, gpointer user_data)
move_object_to_coords (self, data->object, event->x, event->y);
queue_object_draw (self, data->object);
break;
case OPER_0:
check_terminals (self, event->x, event->y);
break;
}
return FALSE;
}
@ -1051,6 +1145,7 @@ on_scroll (GtkWidget *widget, GdkEventScroll *event, gpointer user_data)
}
update_adjustments (self);
check_terminals (self, event->x, event->y);
gtk_widget_queue_draw (widget);
return TRUE;
}
@ -1076,6 +1171,7 @@ on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
draw_grid (widget, &data);
draw_diagram (widget, &data);
draw_terminal (widget, &data);
cairo_destroy (data.cr);
return FALSE;
@ -1116,6 +1212,24 @@ draw_grid (GtkWidget *widget, DrawData *data)
cairo_stroke (data->cr);
}
static void
draw_terminal (GtkWidget *widget, DrawData *data)
{
LdCanvasPrivate *priv;
priv = data->self->priv;
if (!priv->terminal_highlighted)
return;
ld_canvas_color_apply (COLOR_GET (data->self, COLOR_TERMINAL), data->cr);
cairo_set_line_width (data->cr, 1);
cairo_new_path (data->cr);
cairo_arc (data->cr, priv->terminal.x, priv->terminal.y,
TERMINAL_RADIUS, 0, 2 * G_PI);
cairo_stroke (data->cr);
}
static void
draw_diagram (GtkWidget *widget, DrawData *data)
{