2010-09-17 18:48:02 +02:00
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/*
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2010-09-17 19:03:03 +02:00
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* ld-canvas.c
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2010-09-17 18:48:02 +02:00
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*
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* This file is a part of logdiag.
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* Copyright Přemysl Janouch 2010. All rights reserved.
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*
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* See the file LICENSE for licensing information.
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*
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*/
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#include <gtk/gtk.h>
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#include "config.h"
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2010-09-17 19:57:20 +02:00
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#include "ld-marshal.h"
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2010-09-17 19:03:03 +02:00
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#include "ld-document.h"
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2010-09-19 09:10:16 +02:00
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#include "ld-canvas.h"
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2010-09-17 18:48:02 +02:00
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/**
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2010-09-17 19:03:03 +02:00
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* SECTION:ld-canvas
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2010-09-17 18:48:02 +02:00
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* @short_description: A canvas.
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2010-09-17 19:16:53 +02:00
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* @see_also: #LdDocument
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2010-09-17 18:48:02 +02:00
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*
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2010-09-17 19:16:53 +02:00
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* #LdCanvas is used for displaying #LdDocument objects.
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2010-09-17 18:48:02 +02:00
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*/
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/*
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2010-09-17 19:16:53 +02:00
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* LdCanvasPrivate:
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2010-09-17 18:48:02 +02:00
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* @document: A document object assigned to this canvas as a model.
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*/
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2010-09-17 19:16:53 +02:00
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struct _LdCanvasPrivate
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2010-09-17 18:48:02 +02:00
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{
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LdDocument *document;
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2010-09-17 18:48:02 +02:00
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};
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2010-09-17 19:16:53 +02:00
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G_DEFINE_TYPE (LdCanvas, ld_canvas, GTK_TYPE_DRAWING_AREA);
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2010-09-17 18:48:02 +02:00
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enum
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{
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PROP_0,
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PROP_DOCUMENT
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};
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static void
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ld_canvas_get_property (GObject *object, guint property_id,
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GValue *value, GParamSpec *pspec);
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static void
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ld_canvas_set_property (GObject *object, guint property_id,
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const GValue *value, GParamSpec *pspec);
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2010-09-17 18:48:02 +02:00
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static void
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ld_canvas_finalize (GObject *gobject);
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2010-09-19 09:10:16 +02:00
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static gboolean
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on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data);
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static void
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draw_grid (GtkWidget *widget, cairo_t *cr);
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static void
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canvas_paint (GtkWidget *widget, cairo_t *cr);
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static void
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ld_canvas_class_init (LdCanvasClass *klass)
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{
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GObjectClass *object_class;
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GtkWidgetClass *widget_class;
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GParamSpec *pspec;
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2010-09-17 18:48:02 +02:00
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object_class = G_OBJECT_CLASS (klass);
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object_class->get_property = ld_canvas_get_property;
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object_class->set_property = ld_canvas_set_property;
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object_class->finalize = ld_canvas_finalize;
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2010-09-17 18:48:02 +02:00
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2010-09-19 09:10:16 +02:00
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/**
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* LdCanvas:document:
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*
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* The underlying #LdDocument object of this canvas.
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*/
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pspec = g_param_spec_object ("document", "Document",
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"The underlying document object of this canvas.",
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LD_TYPE_DOCUMENT, G_PARAM_READWRITE);
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g_object_class_install_property (object_class, PROP_DOCUMENT, pspec);
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2010-09-17 18:48:02 +02:00
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widget_class = GTK_WIDGET_CLASS (klass);
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2010-09-18 08:55:13 +02:00
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/* TODO: Scrolling support; make the comment bellow a gtk-doc comment then. */
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/*
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* LdCanvas::set-scroll-adjustments:
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* @canvas: The canvas object.
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*
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* Contents of the library have changed.
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*/
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/*
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widget_class->set_scroll_adjustments_signal = g_signal_new
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("set-scroll-adjustments", G_TYPE_FROM_CLASS (widget_class),
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G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
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G_STRUCT_OFFSET (LdCanvasClass, set_scroll_adjustments),
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2010-09-17 18:48:02 +02:00
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NULL, NULL,
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g_cclosure_user_marshal_VOID__OBJECT_OBJECT,
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G_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
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*/
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2010-09-17 19:16:53 +02:00
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g_type_class_add_private (klass, sizeof (LdCanvasPrivate));
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2010-09-17 18:48:02 +02:00
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}
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static void
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ld_canvas_init (LdCanvas *self)
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2010-09-17 18:48:02 +02:00
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE
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2010-09-17 19:16:53 +02:00
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(self, LD_TYPE_CANVAS, LdCanvasPrivate);
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2010-09-19 09:10:16 +02:00
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g_signal_connect (self, "expose-event", G_CALLBACK (on_expose_event), NULL);
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2010-09-17 18:48:02 +02:00
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}
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static void
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2010-09-17 19:16:53 +02:00
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ld_canvas_finalize (GObject *gobject)
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2010-09-17 18:48:02 +02:00
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{
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LdCanvas *self;
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2010-09-17 18:48:02 +02:00
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2010-09-17 19:16:53 +02:00
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self = LD_CANVAS (gobject);
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2010-09-17 18:48:02 +02:00
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/* Chain up to the parent class. */
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G_OBJECT_CLASS (ld_canvas_parent_class)->finalize (gobject);
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}
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2010-09-19 09:10:16 +02:00
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static void
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ld_canvas_get_property (GObject *object, guint property_id,
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GValue *value, GParamSpec *pspec)
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{
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LdCanvas *self;
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self = LD_CANVAS (object);
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switch (property_id)
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{
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case PROP_DOCUMENT:
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g_value_set_object (value, ld_canvas_get_document (self));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
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}
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static void
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ld_canvas_set_property (GObject *object, guint property_id,
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const GValue *value, GParamSpec *pspec)
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{
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LdCanvas *self;
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self = LD_CANVAS (object);
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switch (property_id)
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{
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case PROP_DOCUMENT:
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ld_canvas_set_document (self, LD_DOCUMENT (g_value_get_object (value)));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
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}
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2010-09-17 18:48:02 +02:00
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/**
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* ld_canvas_new:
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*
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* Create an instance.
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*/
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LdCanvas *
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ld_canvas_new (void)
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{
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return g_object_new (LD_TYPE_CANVAS, NULL);
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}
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/**
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* ld_canvas_set_document:
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* @self: An #LdCanvas object.
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* @document: The #LdDocument to be assigned to the canvas.
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*
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* Assign an #LdDocument object to the canvas.
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*/
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void
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ld_canvas_set_document (LdCanvas *self, LdDocument *document)
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{
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self->priv->document = document;
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}
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/**
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* ld_canvas_get_document:
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* @self: An #LdCanvas object.
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*
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* Get the #LdDocument object assigned to this canvas.
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* The reference count on the document is not incremented.
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*/
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LdDocument *
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ld_canvas_get_document (LdCanvas *self)
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{
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return self->priv->document;
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}
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static gboolean
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on_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
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{
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cairo_t *cr;
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cr = gdk_cairo_create (widget->window);
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cairo_rectangle (cr, event->area.x, event->area.y,
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event->area.width, event->area.height);
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cairo_clip (cr);
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canvas_paint (widget, cr);
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cairo_destroy (cr);
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return FALSE;
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}
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static void
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draw_grid (GtkWidget *widget, cairo_t *cr)
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{
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int x, y;
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/* Drawing points:
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* http://lists.freedesktop.org/archives/cairo/2009-June/017459.html
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*/
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cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);
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cairo_set_line_width (cr, 1);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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/* FIXME: Invariable grid size; it's slow because it draws whole area. */
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for (x = 0; x < widget->allocation.width; x += 20)
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{
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for (y = 0; y < widget->allocation.height; y += 20)
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{
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/* Drawing sharp lines (also applies to these dots):
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* http://www.cairographics.org/FAQ/#sharp_lines
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*/
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cairo_move_to (cr, x + 0.5, y + 0.5);
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cairo_close_path (cr);
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cairo_stroke (cr);
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}
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}
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}
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static void
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canvas_paint (GtkWidget *widget, cairo_t *cr)
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{
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/* Paint a white background. */
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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draw_grid (widget, cr);
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}
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