_WCRTLINK short _WCI86FAR _CGRAPH _arc( short x1, short y1, short x2, short y2,
/*====================*/ short x3, short y3, short x4, short y4 )
/* This function draws an elliptical arc. 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( _VtoPhysX( x1 ), _VtoPhysY( y1 ),
_VtoPhysX( x2 ), _VtoPhysY( y2 ),
_VtoPhysX( x3 ), _VtoPhysY( y3 ),
_VtoPhysX( x4 ), _VtoPhysY( y4 ) );
if( success ) {
_moveto( _GetLogX( _ArcInfo.end.xcoord ),
_GetLogY( _ArcInfo.end.ycoord ) );
}
_GrEpilog();
} else {
success = 0;
}
return( success );
}
_WCRTLINK void _WCI86FAR _CGRAPH _getimage( short x1, short y1, short x2, short y2,
/*========================*/ char _WCI86HUGE * image )
/* This routine places the rectangle defined by ( x1, y1 ) and ( x2, y2 ),
in viewport coordinates, into a buffer pointed to by image. */
{
if( _GrProlog() ) {
_L2getimage( _VtoPhysX( x1 ), _VtoPhysY( y1 ),
_VtoPhysX( x2 ), _VtoPhysY( y2 ), image );
_GrEpilog();
}
}
_WCRTLINK struct _wxycoord _WCI86FAR _CGRAPH _getwindowcoord( short x, short y )
/*===============================================================
Map (x,y) from viewport coordinates to window coordinates. */
{
float y1;
struct _wxycoord pt;
if( _GraphMode() ) {
pt.wx = _Window.xleft + ( _Window.xright - _Window.xleft ) *
( _VtoPhysX( x ) - _CurrState->clip.xmin ) /
( _CurrState->clip.xmax - _CurrState->clip.xmin );
y1 = (float) ( _VtoPhysY( y ) - _CurrState->clip.ymin ) /
( _CurrState->clip.ymax - _CurrState->clip.ymin );
if( _Window.invert ) {
pt.wy = _Window.ytop - y1 * ( _Window.ytop - _Window.ybottom );
} else {
pt.wy = y1 * ( _Window.ybottom - _Window.ytop ) + _Window.ytop;
}
} else {
pt.wx = 0;
pt.wy = 0;
}
return( pt );
}
_WCRTLINK short _WCI86FAR _CGRAPH _ellipse( short fill, short x1, short y1, short x2, short y2 )
/*===============================================================================
This function draws or fills an ellipse defined by the rectangle whose
opposite corners are ( x1, y1 ) and ( x2, y2 ) in viewport coordinates. */
{
short success;
if( _GrProlog() ) {
success = _L2ellipse( fill, _VtoPhysX( x1 ), _VtoPhysY( y1 ),
_VtoPhysX( x2 ), _VtoPhysY( y2 ) );
_GrEpilog();
} else {
success = 0;
}
return( success );
}
