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/usr/include/UniIdraw/idarrowhead.h is in ivtools-dev 1.2.11a1-11.

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/*
 * Copyright (c) 1999 Vectaport Inc.
 * Copyright (c) 1990, 1991 Stanford University
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the names of the copyright holders not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.  The copyright holders make
 * no representations about the suitability of this software for any purpose.
 * It is provided "as is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Definition of Arrowhead graphic.
 */

#ifndef idarrowhead_h
#define idarrowhead_h

#include <Unidraw/Graphic/polygons.h>

class Arrowhead : public SF_Polygon {
public:
    Arrowhead(Coord tipx, Coord tipy, Coord w, Coord h, Graphic* gr = nil);

    void CorrectedTip(Coord&, Coord&, PSBrush*, Transformer*);

    virtual Graphic* Copy();
    virtual Graphic& operator = (Graphic&);
    virtual Arrowhead& operator = (Arrowhead&);
protected:
    Arrowhead(Coord*, Coord*, Graphic*);

    virtual void draw(Canvas*, Graphic*);

    Coord CorrectedHeight(float line_thk);
    float UnscaledLength(float length, Transformer* t);
protected:
    Coord* x(Coord, Coord);
    Coord* y(Coord, Coord);
};

#endif