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Partial refactoring of LdCanvas.

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draw_symbol() had been doing too much.
This commit is contained in:
Přemysl Eric Janouch
2011-01-04 00:45:44 +01:00
parent 2cb570f894
commit 820239597e
1 changed files with 87 additions and 48 deletions
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135
src/ld-canvas.c
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@@ -34,7 +34,7 @@
#define MM_PER_INCH 25.4
/* Tolerance on all sides of symbols for strokes. */
#define SYMBOL_AREA_TOLERANCE 0.5
#define SYMBOL_AREA_CLIP_TOLERANCE 0.5
/* The default screen resolution in DPI units. */
#define DEFAULT_SCREEN_RESOLUTION 96
@@ -94,21 +94,27 @@ static void ld_canvas_set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec);
static void ld_canvas_finalize (GObject *gobject);
static void on_adjustment_value_changed
(GtkAdjustment *adjustment, LdCanvas *self);
static void ld_canvas_real_set_scroll_adjustments
(LdCanvas *self, GtkAdjustment *horizontal, GtkAdjustment *vertical);
static void on_adjustment_value_changed
(GtkAdjustment *adjustment, LdCanvas *self);
static void on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
gpointer user_data);
static gdouble ld_canvas_get_base_unit_in_px (GtkWidget *self);
static gdouble ld_canvas_get_scale_in_px (LdCanvas *self);
static void on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
gpointer user_data);
static LdSymbol *resolve_diagram_symbol (LdCanvas *self,
LdDiagramSymbol *diagram_symbol);
static gboolean get_symbol_clip_area_on_widget (LdCanvas *self,
LdDiagramSymbol *diagram_symbol, gdouble *x, gdouble *y,
gdouble *width, gdouble *height);
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_diagram_cb (gpointer link_data, DrawData *data);
static void draw_object (LdDiagramObject *diagram_object, DrawData *data);
static void draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data);
@@ -366,6 +372,9 @@ on_size_allocate (GtkWidget *widget, GtkAllocation *allocation,
}
}
/* ===== Generic interface etc. ============================================ */
/**
* ld_canvas_new:
*
@@ -547,6 +556,56 @@ ld_canvas_diagram_to_widget_coords (LdCanvas *self,
*wy = scale * (dy - self->priv->y) + 0.5 * widget->allocation.height;
}
/* ===== Events, rendering ================================================= */
static LdSymbol *
resolve_diagram_symbol (LdCanvas *self, LdDiagramSymbol *diagram_symbol)
{
if (!self->priv->library)
return NULL;
return ld_library_find_symbol (self->priv->library,
ld_diagram_symbol_get_class (diagram_symbol));
}
static gboolean
get_symbol_clip_area_on_widget (LdCanvas *self, LdDiagramSymbol *diagram_symbol,
gdouble *x, gdouble *y, gdouble *width, gdouble *height)
{
LdSymbol *symbol;
LdSymbolArea area;
gdouble x1, x2;
gdouble y1, y2;
gdouble object_x, object_y;
symbol = resolve_diagram_symbol (self, diagram_symbol);
object_x = ld_diagram_object_get_x (LD_DIAGRAM_OBJECT (diagram_symbol));
object_y = ld_diagram_object_get_y (LD_DIAGRAM_OBJECT (diagram_symbol));
if (symbol)
ld_symbol_get_area (symbol, &area);
else
return FALSE;
/* TODO: Rotate the space for other orientations. */
ld_canvas_diagram_to_widget_coords (self,
object_x + area.x - SYMBOL_AREA_CLIP_TOLERANCE,
object_y + area.y - SYMBOL_AREA_CLIP_TOLERANCE,
&x1, &y1);
ld_canvas_diagram_to_widget_coords (self,
object_x + area.x + area.width + SYMBOL_AREA_CLIP_TOLERANCE,
object_y + area.y + area.height + SYMBOL_AREA_CLIP_TOLERANCE,
&x2, &y2);
*x = x1;
*y = y1;
*width = x2 - x1;
*height = y2 - y1;
return TRUE;
}
static gboolean
on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
{
@@ -619,32 +678,28 @@ draw_diagram (GtkWidget *widget, DrawData *data)
/* Draw objects from the diagram. */
objects = ld_diagram_get_objects (data->self->priv->diagram);
g_slist_foreach (objects, (GFunc) draw_diagram_cb, data);
g_slist_foreach (objects, (GFunc) draw_object, data);
cairo_restore (data->cr);
}
static void
draw_diagram_cb (gpointer link_data, DrawData *data)
draw_object (LdDiagramObject *diagram_object, DrawData *data)
{
g_return_if_fail (link_data != NULL);
g_return_if_fail (LD_IS_DIAGRAM_OBJECT (diagram_object));
g_return_if_fail (data != NULL);
if (LD_IS_DIAGRAM_SYMBOL (link_data))
draw_symbol (LD_DIAGRAM_SYMBOL (link_data), data);
if (LD_IS_DIAGRAM_SYMBOL (diagram_object))
draw_symbol (LD_DIAGRAM_SYMBOL (diagram_object), data);
}
static void
draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data)
{
LdSymbol *symbol;
LdSymbolArea area;
gdouble x, y;
gdouble x, y, width, height;
if (!data->self->priv->library)
return;
symbol = ld_library_find_symbol (data->self->priv->library,
ld_diagram_symbol_get_class (diagram_symbol));
symbol = resolve_diagram_symbol (data->self, diagram_symbol);
/* TODO: Resolve this better; draw a cross or whatever. */
if (!symbol)
@@ -654,44 +709,28 @@ draw_symbol (LdDiagramSymbol *diagram_symbol, DrawData *data)
return;
}
if (!get_symbol_clip_area_on_widget (data->self, diagram_symbol,
&x, &y, &width, &height))
return;
if (x > data->exposed_rect.x + data->exposed_rect.width
|| y > data->exposed_rect.y + data->exposed_rect.height
|| x + width < data->exposed_rect.x
|| y + height < data->exposed_rect.y)
return;
cairo_save (data->cr);
cairo_rectangle (data->cr, x, y, width, height);
cairo_clip (data->cr);
/* TODO: Rotate the space for other orientations. */
ld_canvas_diagram_to_widget_coords (data->self,
ld_diagram_object_get_x (LD_DIAGRAM_OBJECT (diagram_symbol)),
ld_diagram_object_get_y (LD_DIAGRAM_OBJECT (diagram_symbol)),
&x, &y);
/* TODO: Rotate the space for other orientations. */
cairo_save (data->cr);
cairo_translate (data->cr, x, y);
cairo_scale (data->cr, data->scale, data->scale);
/* Only draw the symbol if it intersects the exposed area. */
ld_symbol_get_area (symbol, &area);
x = area.x - SYMBOL_AREA_TOLERANCE;
y = area.y - SYMBOL_AREA_TOLERANCE;
cairo_user_to_device (data->cr, &x, &y);
if (x > data->exposed_rect.x + data->exposed_rect.width
|| y > data->exposed_rect.y + data->exposed_rect.height)
goto draw_symbol_end;
x = area.x + area.width + SYMBOL_AREA_TOLERANCE;
y = area.y + area.height + SYMBOL_AREA_TOLERANCE;
cairo_user_to_device (data->cr, &x, &y);
if (x < data->exposed_rect.x
|| y < data->exposed_rect.y)
goto draw_symbol_end;
cairo_rectangle (data->cr,
area.x - SYMBOL_AREA_TOLERANCE,
area.y - SYMBOL_AREA_TOLERANCE,
area.width + 2 * SYMBOL_AREA_TOLERANCE,
area.height + 2 * SYMBOL_AREA_TOLERANCE);
cairo_clip (data->cr);
ld_symbol_draw (symbol, data->cr);
draw_symbol_end:
cairo_restore (data->cr);
}