Draw symbols from LdDocument in LdCanvas.
Just the minimal implementation so far.
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@ -15,6 +15,7 @@
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#include "ld-marshal.h"
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#include "ld-document-object.h"
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#include "ld-document-symbol.h"
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#include "ld-document.h"
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#include "ld-symbol.h"
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#include "ld-library.h"
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@ -32,6 +33,9 @@
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/* Milimetres per inch. */
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#define MM_PER_INCH 25.4
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/* Tolerance on all sides of symbols for strokes. */
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#define SYMBOL_AREA_TOLERANCE 0.5
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/*
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* LdCanvasPrivate:
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* @document: A document object assigned to this canvas as a model.
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@ -101,6 +105,8 @@ static gboolean on_expose_event (GtkWidget *widget, GdkEventExpose *event,
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gpointer user_data);
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static void draw_grid (GtkWidget *widget, DrawData *data);
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static void draw_document (GtkWidget *widget, DrawData *data);
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static void draw_document_cb (gpointer link_data, DrawData *data);
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static void draw_symbol (LdDocumentSymbol *document_symbol, DrawData *data);
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static void
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@ -572,6 +578,90 @@ draw_grid (GtkWidget *widget, DrawData *data)
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static void
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draw_document (GtkWidget *widget, DrawData *data)
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{
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/* TODO: Draw symbols from the document. */
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GSList *objects;
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if (!data->self->priv->document)
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return;
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cairo_save (data->cr);
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cairo_set_source_rgb (data->cr, 0, 0, 0);
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cairo_set_line_width (data->cr, 1 / data->scale);
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/* Draw objects from the document. */
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objects = ld_document_get_objects (data->self->priv->document);
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g_slist_foreach (objects, (GFunc) draw_document_cb, data);
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cairo_restore (data->cr);
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}
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static void
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draw_document_cb (gpointer link_data, DrawData *data)
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{
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g_return_if_fail (link_data != NULL);
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g_return_if_fail (data != NULL);
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if (LD_IS_DOCUMENT_SYMBOL (link_data))
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draw_symbol (LD_DOCUMENT_SYMBOL (link_data), data);
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}
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static void
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draw_symbol (LdDocumentSymbol *document_symbol, DrawData *data)
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{
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LdSymbol *symbol;
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LdSymbolArea area;
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gdouble x, y;
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if (!data->self->priv->library)
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return;
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symbol = ld_library_find_symbol (data->self->priv->library,
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ld_document_symbol_get_class (document_symbol));
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/* TODO: Resolve this better; draw a cross or whatever. */
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if (!symbol)
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{
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g_warning ("Cannot find symbol %s in the library.",
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ld_document_symbol_get_class (document_symbol));
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return;
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}
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x = ld_document_object_get_x (LD_DOCUMENT_OBJECT (document_symbol));
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y = ld_document_object_get_y (LD_DOCUMENT_OBJECT (document_symbol));
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ld_canvas_translate_document_coordinates (data->self, &x, &y);
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/* TODO: Rotate the space for other orientations. */
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cairo_save (data->cr);
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cairo_translate (data->cr, x, y);
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cairo_scale (data->cr, data->scale, data->scale);
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/* Only draw the symbol if it intersects the exposed area. */
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ld_symbol_get_area (symbol, &area);
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x = area.x - SYMBOL_AREA_TOLERANCE;
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y = area.y - SYMBOL_AREA_TOLERANCE;
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cairo_user_to_device (data->cr, &x, &y);
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if (x > data->exposed_rect.x + data->exposed_rect.width
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|| y > data->exposed_rect.y + data->exposed_rect.height)
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goto draw_symbol_end;
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x = area.x + area.width + SYMBOL_AREA_TOLERANCE;
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y = area.y + area.height + SYMBOL_AREA_TOLERANCE;
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cairo_user_to_device (data->cr, &x, &y);
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if (x < data->exposed_rect.x
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|| y < data->exposed_rect.y)
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goto draw_symbol_end;
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cairo_rectangle (data->cr,
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area.x - SYMBOL_AREA_TOLERANCE,
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area.y - SYMBOL_AREA_TOLERANCE,
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area.width + 2 * SYMBOL_AREA_TOLERANCE,
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area.height + 2 * SYMBOL_AREA_TOLERANCE);
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cairo_clip (data->cr);
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ld_symbol_draw (symbol, data->cr);
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draw_symbol_end:
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cairo_restore (data->cr);
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}
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