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Draw symbols from LdDocument in LdCanvas. 

Just the minimal implementation so far.
This commit is contained in:
Přemysl Eric Janouch 2010-12-10 22:44:12 +01:00
parent 3419680f25
commit dea23f1204
1 changed files with 91 additions and 1 deletions
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92
src/ld-canvas.c
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@ -15,6 +15,7 @@
#include "ld-marshal.h"
#include "ld-document-object.h"
#include "ld-document-symbol.h"
#include "ld-document.h"
#include "ld-symbol.h"
#include "ld-library.h"
@ -32,6 +33,9 @@
/* Milimetres per inch. */
#define MM_PER_INCH 25.4
/* Tolerance on all sides of symbols for strokes. */
#define SYMBOL_AREA_TOLERANCE 0.5
/*
* LdCanvasPrivate:
* @document: A document object assigned to this canvas as a model.
@ -101,6 +105,8 @@ static gboolean on_expose_event (GtkWidget *widget, GdkEventExpose *event,
gpointer user_data);
static void draw_grid (GtkWidget *widget, DrawData *data);
static void draw_document (GtkWidget *widget, DrawData *data);
static void draw_document_cb (gpointer link_data, DrawData *data);
static void draw_symbol (LdDocumentSymbol *document_symbol, DrawData *data);
static void
@ -572,6 +578,90 @@ draw_grid (GtkWidget *widget, DrawData *data)
static void
draw_document (GtkWidget *widget, DrawData *data)
{
/* TODO: Draw symbols from the document. */
GSList *objects;
if (!data->self->priv->document)
return;
cairo_save (data->cr);
cairo_set_source_rgb (data->cr, 0, 0, 0);
cairo_set_line_width (data->cr, 1 / data->scale);
/* Draw objects from the document. */
objects = ld_document_get_objects (data->self->priv->document);
g_slist_foreach (objects, (GFunc) draw_document_cb, data);
cairo_restore (data->cr);
}
static void
draw_document_cb (gpointer link_data, DrawData *data)
{
g_return_if_fail (link_data != NULL);
g_return_if_fail (data != NULL);
if (LD_IS_DOCUMENT_SYMBOL (link_data))
draw_symbol (LD_DOCUMENT_SYMBOL (link_data), data);
}
static void
draw_symbol (LdDocumentSymbol *document_symbol, DrawData *data)
{
LdSymbol *symbol;
LdSymbolArea area;
gdouble x, y;
if (!data->self->priv->library)
return;
symbol = ld_library_find_symbol (data->self->priv->library,
ld_document_symbol_get_class (document_symbol));
/* TODO: Resolve this better; draw a cross or whatever. */
if (!symbol)
{
g_warning ("Cannot find symbol %s in the library.",
ld_document_symbol_get_class (document_symbol));
return;
}
x = ld_document_object_get_x (LD_DOCUMENT_OBJECT (document_symbol));
y = ld_document_object_get_y (LD_DOCUMENT_OBJECT (document_symbol));
ld_canvas_translate_document_coordinates (data->self, &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);
}