src/filters/distantlight.cpp

	distantlight.cpp revision 6c3e745a94ef6b25a4ef9f018d350a7535aa45af
#define __SP_FEDISTANTLIGHT_CPP__

/** \file
 * SVG <fedistantlight> implementation.
 */
/*
 * Authors:
 *   Hugo Rodrigues <haa.rodrigues@gmail.com>
 *   Niko Kiirala <niko@kiirala.com>
 *   Jean-Rene Reinhard <jr@komite.net>
 *
 * Copyright (C) 2006,2007 Authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <glib.h>

#include "attributes.h"
#include "document.h"
#include "distantlight.h"
#include "diffuselighting-fns.h"
#include "specularlighting-fns.h"
#include "xml/repr.h"

#define SP_MACROS_SILENT
#include "macros.h"

/* FeDistantLight class */

static void sp_fedistantlight_class_init(SPFeDistantLightClass *klass);
static void sp_fedistantlight_init(SPFeDistantLight *fedistantlight);

static void sp_fedistantlight_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
static void sp_fedistantlight_release(SPObject *object);
static void sp_fedistantlight_set(SPObject *object, unsigned int key, gchar const *value);
static void sp_fedistantlight_update(SPObject *object, SPCtx *ctx, guint flags);
static Inkscape::XML::Node *sp_fedistantlight_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);

static SPObjectClass *feDistantLight_parent_class;

GType
sp_fedistantlight_get_type()
{
    static GType fedistantlight_type = 0;

    if (!fedistantlight_type) {
        GTypeInfo fedistantlight_info = {
            sizeof(SPFeDistantLightClass),
            NULL, NULL,
            (GClassInitFunc) sp_fedistantlight_class_init,
            NULL, NULL,
            sizeof(SPFeDistantLight),
            16,
            (GInstanceInitFunc) sp_fedistantlight_init,
            NULL,    /* value_table */
        };
        fedistantlight_type = g_type_register_static(SP_TYPE_OBJECT, "SPFeDistantLight", &fedistantlight_info, (GTypeFlags)0);
    }
    return fedistantlight_type;
}

static void
sp_fedistantlight_class_init(SPFeDistantLightClass *klass)
{

    SPObjectClass *sp_object_class = (SPObjectClass *)klass;

    feDistantLight_parent_class = (SPObjectClass*)g_type_class_peek_parent(klass);

    sp_object_class->build = sp_fedistantlight_build;
    sp_object_class->release = sp_fedistantlight_release;
    sp_object_class->write = sp_fedistantlight_write;
    sp_object_class->set = sp_fedistantlight_set;
    sp_object_class->update = sp_fedistantlight_update;
}

static void
sp_fedistantlight_init(SPFeDistantLight *fedistantlight)
{
    fedistantlight->azimuth = 0;
    fedistantlight->elevation = 0;
    fedistantlight->azimuth_set = FALSE;
    fedistantlight->elevation_set = FALSE;
}

/**
 * Reads the Inkscape::XML::Node, and initializes SPDistantLight variables.  For this to get called,
 * our name must be associated with a repr via "sp_object_type_register".  Best done through
 * sp-object-repr.cpp's repr_name_entries array.
 */
static void
sp_fedistantlight_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
{
    if (((SPObjectClass *) feDistantLight_parent_class)->build) {
        ((SPObjectClass *) feDistantLight_parent_class)->build(object, document, repr);
    }

    //Read values of key attributes from XML nodes into object.
    sp_object_read_attr(object, "azimuth");
    sp_object_read_attr(object, "elevation");

//is this necessary?
    sp_document_add_resource(document, "fedistantlight", object);
}

/**
 * Drops any allocated memory.
 */
static void
sp_fedistantlight_release(SPObject *object)
{
    //SPFeDistantLight *fedistantlight = SP_FEDISTANTLIGHT(object);

    if (SP_OBJECT_DOCUMENT(object)) {
        /* Unregister ourselves */
        sp_document_remove_resource(SP_OBJECT_DOCUMENT(object), "fedistantlight", SP_OBJECT(object));
    }

//TODO: release resources here
}

/**
 * Sets a specific value in the SPFeDistantLight.
 */
static void
sp_fedistantlight_set(SPObject *object, unsigned int key, gchar const *value)
{
    SPFeDistantLight *fedistantlight = SP_FEDISTANTLIGHT(object);
    gchar *end_ptr;
    switch (key) {
    case SP_ATTR_AZIMUTH:
        end_ptr =NULL;
        if (value) {
            fedistantlight->azimuth = g_ascii_strtod(value, &end_ptr);
            if (end_ptr) {
                fedistantlight->azimuth_set = TRUE;
            }
        }
        if (!value || !end_ptr) {
                fedistantlight->azimuth_set = FALSE;
                fedistantlight->azimuth = 0;
        }
        if (object->parent &&
                (SP_IS_FEDIFFUSELIGHTING(object->parent) ||
                 SP_IS_FESPECULARLIGHTING(object->parent))) {
            object->parent->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
        }
        break;
    case SP_ATTR_ELEVATION:
        end_ptr =NULL;
        if (value) {
            fedistantlight->elevation = g_ascii_strtod(value, &end_ptr);
            if (end_ptr) {
                fedistantlight->elevation_set = TRUE;
            }
        }
        if (!value || !end_ptr) {
                fedistantlight->elevation_set = FALSE;
                fedistantlight->elevation = 0;
        }
        if (object->parent &&
                (SP_IS_FEDIFFUSELIGHTING(object->parent) ||
                 SP_IS_FESPECULARLIGHTING(object->parent))) {
            object->parent->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
        }
        break;
    default:
        // See if any parents need this value.
        if (((SPObjectClass *) feDistantLight_parent_class)->set) {
            ((SPObjectClass *) feDistantLight_parent_class)->set(object, key, value);
        }
        break;
    }
}

/**
 *  * Receives update notifications.
 *   */
static void
sp_fedistantlight_update(SPObject *object, SPCtx *ctx, guint flags)
{
    SPFeDistantLight *feDistantLight = SP_FEDISTANTLIGHT(object);
    (void)feDistantLight;

    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        /* do something to trigger redisplay, updates? */
        sp_object_read_attr(object, "azimuth");
        sp_object_read_attr(object, "elevation");
    }

    if (((SPObjectClass *) feDistantLight_parent_class)->update) {
        ((SPObjectClass *) feDistantLight_parent_class)->update(object, ctx, flags);
    }
}

/**
 * Writes its settings to an incoming repr object, if any.
 */
static Inkscape::XML::Node *
sp_fedistantlight_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags)
{
    SPFeDistantLight *fedistantlight = SP_FEDISTANTLIGHT(object);

    if (!repr) {
        repr = SP_OBJECT_REPR(object)->duplicate(doc);
    }

    if (fedistantlight->azimuth_set)
        sp_repr_set_css_double(repr, "azimuth", fedistantlight->azimuth);
    if (fedistantlight->elevation_set)
        sp_repr_set_css_double(repr, "elevation", fedistantlight->elevation);

    if (((SPObjectClass *) feDistantLight_parent_class)->write) {
        ((SPObjectClass *) feDistantLight_parent_class)->write(object, doc, repr, flags);
    }

    return repr;
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :