zarc.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 91 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
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****************************************************************************/


#include "gdefn.h"


short _WCI86FAR _CGRAPH _arc_w( double x1, double y1, double x2, double y2,
/*======================*/ double x3, double y3, double x4, double y4 )

/* This function draws an elliptical arc in window coordinates. The virtual
   ellipse is defined by the rectangle whose opposite corners are ( x1, y1 )
   and ( x2, y2 ).  The intersections of the vectors from the center of the
   ellipse to the points ( x3, y3 ) and ( x4, y4 ) define the start and end
   points respectively where the arc is drawn in a counter clockwise
   direction. */

{
    short           success;

    if( _GrProlog() ) {
        success = _L2arc( _WtoPhysX( x1 ), _WtoPhysY( y1 ),
                          _WtoPhysX( x2 ), _WtoPhysY( y2 ),
                          _WtoPhysX( x3 ), _WtoPhysY( y3 ),
                          _WtoPhysX( x4 ), _WtoPhysY( y4 ) );
        _GrEpilog();
    } else {
        success = 0;
    }
    return( success );
}

Entry( _ARC_W, _arc_w ) // alternate entry-point


short _WCI86FAR _CGRAPH _arc_wxy( struct _wxycoord _WCI86FAR * p1,
/*========================*/ struct _wxycoord _WCI86FAR * p2,
                             struct _wxycoord _WCI86FAR * p3,
                             struct _wxycoord _WCI86FAR * p4 )

/* This function draws an elliptical arc in window coordinates. The virtual
   ellipse is defined by the rectangle whose opposite corners are "p1" and
   "p2".  The intersections of the vectors from the center of the ellipse
   to the points "p3" and "p4" define the start and end points
   respectively where the arc is drawn in a counter clockwise direction.*/

{
    return( _arc_w( p1->wx, p1->wy, p2->wx, p2->wy,
                    p3->wx, p3->wy, p4->wx, p4->wy ) );
}

Entry( _ARC_WXY, _arc_wxy ) // alternate entry-point


short _WCI86FAR _CGRAPH _arc_w_87( double x1, double y1, double x2, double y2,
/*=========================*/ double x3, double y3, double x4, double y4 )

{
    return( _arc_w( x1, y1, x2, y2, x3, y3, x4, y4 ) );
}

Entry( _ARC_W_87, _arc_w_87 ) // alternate entry-point