inkscape/src/sp-symbol.cpp

	sp-symbol.cpp revision 06aecef405c4cf6f7551ab622c3040562cb62c78
#define __SP_SYMBOL_C__

/*
 * SVG <symbol> implementation
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *
 * Copyright (C) 1999-2003 Lauris Kaplinski
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

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

#include <cstring>
#include <string>

#include "libnr/nr-matrix-fns.h"
#include "libnr/nr-matrix-ops.h"
#include <2geom/transforms.h>
#include "display/nr-arena-group.h"
#include "xml/repr.h"
#include "attributes.h"
#include "print.h"
#include "sp-symbol.h"
#include "document.h"

static void sp_symbol_class_init (SPSymbolClass *klass);
static void sp_symbol_init (SPSymbol *symbol);

static void sp_symbol_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
static void sp_symbol_release (SPObject *object);
static void sp_symbol_set (SPObject *object, unsigned int key, const gchar *value);
static void sp_symbol_child_added (SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref);
static void sp_symbol_update (SPObject *object, SPCtx *ctx, guint flags);
static void sp_symbol_modified (SPObject *object, guint flags);
static Inkscape::XML::Node *sp_symbol_write (SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);

static NRArenaItem *sp_symbol_show (SPItem *item, NRArena *arena, unsigned int key, unsigned int flags);
static void sp_symbol_hide (SPItem *item, unsigned int key);
static void sp_symbol_bbox(SPItem const *item, NRRect *bbox, Geom::Matrix const &transform, unsigned const flags);
static void sp_symbol_print (SPItem *item, SPPrintContext *ctx);

static SPGroupClass *parent_class;

GType
sp_symbol_get_type (void)
{
    static GType type = 0;
    if (!type) {
        GTypeInfo info = {
            sizeof (SPSymbolClass),
            NULL, NULL,
            (GClassInitFunc) sp_symbol_class_init,
            NULL, NULL,
            sizeof (SPSymbol),
            16,
            (GInstanceInitFunc) sp_symbol_init,
            NULL,   /* value_table */
        };
        type = g_type_register_static (SP_TYPE_GROUP, "SPSymbol", &info, (GTypeFlags)0);
    }
    return type;
}

static void
sp_symbol_class_init (SPSymbolClass *klass)
{
    GObjectClass *object_class;
    SPObjectClass *sp_object_class;
    SPItemClass *sp_item_class;

    object_class = G_OBJECT_CLASS (klass);
    sp_object_class = (SPObjectClass *) klass;
    sp_item_class = (SPItemClass *) klass;

    parent_class = (SPGroupClass *)g_type_class_ref (SP_TYPE_GROUP);

    sp_object_class->build = sp_symbol_build;
    sp_object_class->release = sp_symbol_release;
    sp_object_class->set = sp_symbol_set;
    sp_object_class->child_added = sp_symbol_child_added;
    sp_object_class->update = sp_symbol_update;
    sp_object_class->modified = sp_symbol_modified;
    sp_object_class->write = sp_symbol_write;

    sp_item_class->show = sp_symbol_show;
    sp_item_class->hide = sp_symbol_hide;
    sp_item_class->bbox = sp_symbol_bbox;
    sp_item_class->print = sp_symbol_print;
}

static void
sp_symbol_init (SPSymbol *symbol)
{
    symbol->viewBox_set = FALSE;

    symbol->c2p = Geom::identity();
}

static void
sp_symbol_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
{
    SPGroup *group;
    SPSymbol *symbol;

    group = (SPGroup *) object;
    symbol = (SPSymbol *) object;

    sp_object_read_attr (object, "viewBox");
    sp_object_read_attr (object, "preserveAspectRatio");

    if (((SPObjectClass *) parent_class)->build)
        ((SPObjectClass *) parent_class)->build (object, document, repr);
}

static void
sp_symbol_release (SPObject *object)
{
    SPSymbol * symbol;

    symbol = (SPSymbol *) object;

    if (((SPObjectClass *) parent_class)->release)
        ((SPObjectClass *) parent_class)->release (object);
}

static void
sp_symbol_set (SPObject *object, unsigned int key, const gchar *value)
{
    SPItem *item;
    SPSymbol *symbol;

    item = SP_ITEM (object);
    symbol = SP_SYMBOL (object);

    switch (key) {
    case SP_ATTR_VIEWBOX:
        if (value) {
            double x, y, width, height;
            char *eptr;
            /* fixme: We have to take original item affine into account */
            /* fixme: Think (Lauris) */
            eptr = (gchar *) value;
            x = g_ascii_strtod (eptr, &eptr);
            while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
            y = g_ascii_strtod (eptr, &eptr);
            while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
            width = g_ascii_strtod (eptr, &eptr);
            while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
            height = g_ascii_strtod (eptr, &eptr);
            while (*eptr && ((*eptr == ',') || (*eptr == ' '))) eptr++;
            if ((width > 0) && (height > 0)) {
                /* Set viewbox */
                symbol->viewBox.x0 = x;
                symbol->viewBox.y0 = y;
                symbol->viewBox.x1 = x + width;
                symbol->viewBox.y1 = y + height;
                symbol->viewBox_set = TRUE;
            } else {
                symbol->viewBox_set = FALSE;
            }
        } else {
            symbol->viewBox_set = FALSE;
        }
        object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
        break;
    case SP_ATTR_PRESERVEASPECTRATIO:
        /* Do setup before, so we can use break to escape */
        symbol->aspect_set = FALSE;
        symbol->aspect_align = SP_ASPECT_NONE;
        symbol->aspect_clip = SP_ASPECT_MEET;
        object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG);
        if (value) {
            int len;
            gchar c[256];
            const gchar *p, *e;
            unsigned int align, clip;
            p = value;
            while (*p && *p == 32) p += 1;
            if (!*p) break;
            e = p;
            while (*e && *e != 32) e += 1;
            len = e - p;
            if (len > 8) break;
            memcpy (c, value, len);
            c[len] = 0;
            /* Now the actual part */
            if (!strcmp (c, "none")) {
                align = SP_ASPECT_NONE;
            } else if (!strcmp (c, "xMinYMin")) {
                align = SP_ASPECT_XMIN_YMIN;
            } else if (!strcmp (c, "xMidYMin")) {
                align = SP_ASPECT_XMID_YMIN;
            } else if (!strcmp (c, "xMaxYMin")) {
                align = SP_ASPECT_XMAX_YMIN;
            } else if (!strcmp (c, "xMinYMid")) {
                align = SP_ASPECT_XMIN_YMID;
            } else if (!strcmp (c, "xMidYMid")) {
                align = SP_ASPECT_XMID_YMID;
            } else if (!strcmp (c, "xMaxYMid")) {
                align = SP_ASPECT_XMAX_YMID;
            } else if (!strcmp (c, "xMinYMax")) {
                align = SP_ASPECT_XMIN_YMAX;
            } else if (!strcmp (c, "xMidYMax")) {
                align = SP_ASPECT_XMID_YMAX;
            } else if (!strcmp (c, "xMaxYMax")) {
                align = SP_ASPECT_XMAX_YMAX;
            } else {
                break;
            }
            clip = SP_ASPECT_MEET;
            while (*e && *e == 32) e += 1;
            if (*e) {
                if (!strcmp (e, "meet")) {
                    clip = SP_ASPECT_MEET;
                } else if (!strcmp (e, "slice")) {
                    clip = SP_ASPECT_SLICE;
                } else {
                    break;
                }
            }
            symbol->aspect_set = TRUE;
            symbol->aspect_align = align;
            symbol->aspect_clip = clip;
        }
        break;
    default:
        if (((SPObjectClass *) parent_class)->set)
            ((SPObjectClass *) parent_class)->set (object, key, value);
        break;
    }
}

static void
sp_symbol_child_added (SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref)
{
    SPSymbol *symbol;
    SPGroup *group;

    symbol = (SPSymbol *) object;
    group = (SPGroup *) object;

    if (((SPObjectClass *) (parent_class))->child_added)
        ((SPObjectClass *) (parent_class))->child_added (object, child, ref);
}

static void
sp_symbol_update (SPObject *object, SPCtx *ctx, guint flags)
{
    SPItem *item;
    SPSymbol *symbol;
    SPItemCtx *ictx, rctx;
    SPItemView *v;

    item = SP_ITEM (object);
    symbol = SP_SYMBOL (object);
    ictx = (SPItemCtx *) ctx;

    if (SP_OBJECT_IS_CLONED (object)) {
        /* Cloned <symbol> is actually renderable */

        /* fixme: We have to set up clip here too */

        /* Create copy of item context */
        rctx = *ictx;

        /* Calculate child to parent transformation */
        /* Apply parent <use> translation (set up as vewport) */
        symbol->c2p = Geom::Matrix(Geom::Translate(rctx.vp.x0, rctx.vp.y0));

        if (symbol->viewBox_set) {
            double x, y, width, height;
            /* Determine actual viewbox in viewport coordinates */
            if (symbol->aspect_align == SP_ASPECT_NONE) {
                x = 0.0;
                y = 0.0;
                width = rctx.vp.x1 - rctx.vp.x0;
                height = rctx.vp.y1 - rctx.vp.y0;
            } else {
                double scalex, scaley, scale;
                /* Things are getting interesting */
                scalex = (rctx.vp.x1 - rctx.vp.x0) / (symbol->viewBox.x1 - symbol->viewBox.x0);
                scaley = (rctx.vp.y1 - rctx.vp.y0) / (symbol->viewBox.y1 - symbol->viewBox.y0);
                scale = (symbol->aspect_clip == SP_ASPECT_MEET) ? MIN (scalex, scaley) : MAX (scalex, scaley);
                width = (symbol->viewBox.x1 - symbol->viewBox.x0) * scale;
                height = (symbol->viewBox.y1 - symbol->viewBox.y0) * scale;
                /* Now place viewbox to requested position */
                switch (symbol->aspect_align) {
                case SP_ASPECT_XMIN_YMIN:
                    x = 0.0;
                    y = 0.0;
                    break;
                case SP_ASPECT_XMID_YMIN:
                    x = 0.5 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                    y = 0.0;
                    break;
                case SP_ASPECT_XMAX_YMIN:
                    x = 1.0 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                    y = 0.0;
                    break;
                case SP_ASPECT_XMIN_YMID:
                    x = 0.0;
                    y = 0.5 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                    break;
                case SP_ASPECT_XMID_YMID:
                    x = 0.5 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                    y = 0.5 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                    break;
                case SP_ASPECT_XMAX_YMID:
                    x = 1.0 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                    y = 0.5 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                    break;
                case SP_ASPECT_XMIN_YMAX:
                    x = 0.0;
                    y = 1.0 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                    break;
                case SP_ASPECT_XMID_YMAX:
                    x = 0.5 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                    y = 1.0 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                    break;
                case SP_ASPECT_XMAX_YMAX:
                    x = 1.0 * ((rctx.vp.x1 - rctx.vp.x0) - width);
                    y = 1.0 * ((rctx.vp.y1 - rctx.vp.y0) - height);
                    break;
                default:
                    x = 0.0;
                    y = 0.0;
                    break;
                }
            }
            /* Compose additional transformation from scale and position */
            Geom::Matrix q;
            q[0] = width / (symbol->viewBox.x1 - symbol->viewBox.x0);
            q[1] = 0.0;
            q[2] = 0.0;
            q[3] = height / (symbol->viewBox.y1 - symbol->viewBox.y0);
            q[4] = -symbol->viewBox.x0 * q[0] + x;
            q[5] = -symbol->viewBox.y0 * q[3] + y;
            /* Append viewbox transformation */
            symbol->c2p = q * symbol->c2p;
        }

        rctx.i2doc = symbol->c2p * (Geom::Matrix)rctx.i2doc;

        /* If viewBox is set initialize child viewport */
        /* Otherwise <use> has set it up already */
        if (symbol->viewBox_set) {
            rctx.vp.x0 = symbol->viewBox.x0;
            rctx.vp.y0 = symbol->viewBox.y0;
            rctx.vp.x1 = symbol->viewBox.x1;
            rctx.vp.y1 = symbol->viewBox.y1;
            rctx.i2vp = Geom::identity();
        }

        /* And invoke parent method */
        if (((SPObjectClass *) (parent_class))->update)
            ((SPObjectClass *) (parent_class))->update (object, (SPCtx *) &rctx, flags);

        /* As last step set additional transform of arena group */
        for (v = item->display; v != NULL; v = v->next) {
            nr_arena_group_set_child_transform(NR_ARENA_GROUP(v->arenaitem), symbol->c2p);
        }
    } else {
        /* No-op */
        if (((SPObjectClass *) (parent_class))->update)
            ((SPObjectClass *) (parent_class))->update (object, ctx, flags);
    }
}

static void
sp_symbol_modified (SPObject *object, guint flags)
{
    SPSymbol *symbol;

    symbol = SP_SYMBOL (object);

    if (((SPObjectClass *) (parent_class))->modified)
        (* ((SPObjectClass *) (parent_class))->modified) (object, flags);
}

static Inkscape::XML::Node *
sp_symbol_write (SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)
{
    SPSymbol *symbol;

    symbol = SP_SYMBOL (object);

    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
        repr = xml_doc->createElement("svg:symbol");
    }

    repr->setAttribute("viewBox", object->repr->attribute("viewBox"));
    repr->setAttribute("preserveAspectRatio", object->repr->attribute("preserveAspectRatio"));

    if (((SPObjectClass *) (parent_class))->write)
        ((SPObjectClass *) (parent_class))->write (object, xml_doc, repr, flags);

    return repr;
}

static NRArenaItem *
sp_symbol_show (SPItem *item, NRArena *arena, unsigned int key, unsigned int flags)
{
    SPSymbol *symbol;
    NRArenaItem *ai;

    symbol = SP_SYMBOL (item);

    if (SP_OBJECT_IS_CLONED (symbol)) {
        /* Cloned <symbol> is actually renderable */
        if (((SPItemClass *) (parent_class))->show) {
            ai = ((SPItemClass *) (parent_class))->show (item, arena, key, flags);
            if (ai) {
                nr_arena_group_set_child_transform(NR_ARENA_GROUP(ai), symbol->c2p);
            }
        } else {
            ai = NULL;
        }
    } else {
        ai = NULL;
    }

    return ai;
}

static void
sp_symbol_hide (SPItem *item, unsigned int key)
{
    SPSymbol *symbol;

    symbol = SP_SYMBOL (item);

    if (SP_OBJECT_IS_CLONED (symbol)) {
        /* Cloned <symbol> is actually renderable */
        if (((SPItemClass *) (parent_class))->hide)
            ((SPItemClass *) (parent_class))->hide (item, key);
    }
}

static void
sp_symbol_bbox(SPItem const *item, NRRect *bbox, Geom::Matrix const &transform, unsigned const flags)
{
    SPSymbol const *symbol = SP_SYMBOL(item);

    if (SP_OBJECT_IS_CLONED (symbol)) {
        /* Cloned <symbol> is actually renderable */

        if (((SPItemClass *) (parent_class))->bbox) {
            Geom::Matrix const a( symbol->c2p * transform );
            ((SPItemClass *) (parent_class))->bbox(item, bbox, a, flags);
        }
    }
}

static void
sp_symbol_print (SPItem *item, SPPrintContext *ctx)
{
    SPSymbol *symbol = SP_SYMBOL(item);
    if (SP_OBJECT_IS_CLONED (symbol)) {
        /* Cloned <symbol> is actually renderable */

        sp_print_bind(ctx, &symbol->c2p, 1.0);

        if (((SPItemClass *) (parent_class))->print) {
            ((SPItemClass *) (parent_class))->print (item, ctx);
        }

        sp_print_release (ctx);
    }
}