/*
 * SVG <line> implementation
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   Abhishek Sharma
 *   Jon A. Cruz <jon@joncruz.org>
 *
 * Copyright (C) 1999-2002 Lauris Kaplinski
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "attributes.h"
#include "style.h"
#include "sp-line.h"
#include "sp-guide.h"
#include "display/curve.h"
#include <glibmm/i18n.h>
#include "xml/repr.h"
#include "document.h"
#include "inkscape.h"


G_DEFINE_TYPE(SPLine, sp_line, SP_TYPE_SHAPE);

static void
sp_line_class_init(SPLineClass *klass)
{
}

CLine::CLine(SPLine* line) : CShape(line) {
	this->spline = line;
}

CLine::~CLine() {
}

static void
sp_line_init(SPLine * line)
{
	line->cline = new CLine(line);
	line->typeHierarchy.insert(typeid(SPLine));

	delete line->cshape;
	line->cshape = line->cline;
	line->clpeitem = line->cline;
	line->citem = line->cline;
	line->cobject = line->cline;

    line->x1.unset();
    line->y1.unset();
    line->x2.unset();
    line->y2.unset();
}

void CLine::build(SPDocument * document, Inkscape::XML::Node * repr) {
	SPLine* object = this->spline;

    CShape::build(document, repr);

    object->readAttr( "x1" );
    object->readAttr( "y1" );
    object->readAttr( "x2" );
    object->readAttr( "y2" );
}

void CLine::set(unsigned int key, const gchar* value) {
	SPLine* object = this->spline;
    SPLine * line = object;

    /* fixme: we should really collect updates */

    switch (key) {
        case SP_ATTR_X1:
            line->x1.readOrUnset(value);
            object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
            break;
        case SP_ATTR_Y1:
            line->y1.readOrUnset(value);
            object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
            break;
        case SP_ATTR_X2:
            line->x2.readOrUnset(value);
            object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
            break;
        case SP_ATTR_Y2:
            line->y2.readOrUnset(value);
            object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
            break;
        default:
            CShape::set(key, value);
            break;
    }
}

void CLine::update(SPCtx *ctx, guint flags) {
	SPLine* object = this->spline;

    if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
        SPLine *line = SP_LINE(object);

        SPStyle const *style = object->style;
        SPItemCtx const *ictx = (SPItemCtx const *) ctx;
        double const w = ictx->viewport.width();
        double const h = ictx->viewport.height();
        double const em = style->font_size.computed;
        double const ex = em * 0.5;  // fixme: get from pango or libnrtype.
        line->x1.update(em, ex, w);
        line->x2.update(em, ex, w);
        line->y1.update(em, ex, h);
        line->y2.update(em, ex, h);

        ((SPShape *) object)->setShape();
    }

    CShape::update(ctx, flags);
}

Inkscape::XML::Node* CLine::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
	SPLine* object = this->spline;
    SPLine *line  = object;

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

    if (repr != object->getRepr()) {
        repr->mergeFrom(object->getRepr(), "id");
    }

    sp_repr_set_svg_double(repr, "x1", line->x1.computed);
    sp_repr_set_svg_double(repr, "y1", line->y1.computed);
    sp_repr_set_svg_double(repr, "x2", line->x2.computed);
    sp_repr_set_svg_double(repr, "y2", line->y2.computed);

    CShape::write(xml_doc, repr, flags);

    return repr;
}

gchar* CLine::description() {
	return g_strdup(_("<b>Line</b>"));
}

void CLine::convert_to_guides() {
	SPLine* item = this->spline;
    SPLine *line = item;

    Geom::Point points[2];

    Geom::Affine const i2dt(item->i2dt_affine());

    points[0] = Geom::Point(line->x1.computed, line->y1.computed)*i2dt;
    points[1] = Geom::Point(line->x2.computed, line->y2.computed)*i2dt;

    SPGuide::createSPGuide(item->document, points[0], points[1]);
}


Geom::Affine CLine::set_transform(Geom::Affine const &transform) {
	SPLine* item = this->spline;
    SPLine *line = item;

    Geom::Point points[2];

    points[0] = Geom::Point(line->x1.computed, line->y1.computed);
    points[1] = Geom::Point(line->x2.computed, line->y2.computed);

    points[0] *= transform;
    points[1] *= transform;

    line->x1.computed = points[0][Geom::X];
    line->y1.computed = points[0][Geom::Y];
    line->x2.computed = points[1][Geom::X];
    line->y2.computed = points[1][Geom::Y];

    item->adjust_stroke(transform.descrim());

    SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);

    return Geom::identity();
}

void CLine::set_shape() {
	SPLine* shape = this->spline;
    SPLine *line = shape;

    SPCurve *c = new SPCurve();

    c->moveto(line->x1.computed, line->y1.computed);
    c->lineto(line->x2.computed, line->y2.computed);

    shape->setCurveInsync(c, TRUE); // *_insync does not call update, avoiding infinite recursion when set_shape is called by update
    shape->setCurveBeforeLPE(c);

    // LPE's cannot be applied to lines. (the result can (generally) not be represented as SPLine)

    c->unref();
}

/*
  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:fileencoding=utf-8:textwidth=99 :