"
 COPYRIGHT (c) 1996 by Claus Gittinger
              All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"


GeometricWrapper subclass:#StrokingWrapper
	instanceVariableNames:'lineWidth'
	classVariableNames:''
	poolDictionaries:''
	category:'Graphics-Display Objects'
!

!StrokingWrapper class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 1996 by Claus Gittinger
              All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"

!

documentation
"
    a wrapper for a geometric object, which is to be drawn stroked.
    This allows any geometric thingy to be used as a component in a view.

    (background info: geometrics are mathematical objects - they do not 
     keep any color or lineStyle attributes. Wrappers add this information
     and can also be used as components of a view)

    [see also:]
        FillingWrapper Geometric GraphicsContext

    [author:]
        Claus Gittinger
"
!

examples
"
  wrap an ellipticArc and display it
  (notice, that no automatic redraw is performed):
                                                                        [exBegin]
    |v e component|

    v := (View extent:250@250) openAndWait.

    e := EllipticalArc boundingBox:(10@10 corner:90@90)
                        startAngle:0 
                        sweepAngle:270.
    component := StrokingWrapper on:e.

    component displayOn:v.
                                                                        [exEnd]

  wrap a rectangle and an ellipticArc,
  and add them as components to a View
  (notice, that doing so makes the redraw automatic):
                                                                        [exBegin]
    |v e component|

    v := View new.
    v extent:250@250.

    e := Rectangle origin:10@10 corner:90@90.
    component := FillingWrapper on:e.
    component foregroundColor:Color red.

    v addComponent:component.

    e := EllipticalArc boundingBox:(10@10 corner:90@90)
                     startAngle:0 sweepAngle:360.
    component := StrokingWrapper on:e.
    component lineWidth:5.

    v addComponent:component.

    v addComponent:(Button label:'hello').

    v open
                                                                        [exEnd]
"
! !

!StrokingWrapper methodsFor:'accessing'!

bounds
    "return the boundary rectangle - here, must take care of the lineWidth"

    ^ component bounds + (lineWidth - 1)

    "Created: 8.5.1996 / 23:22:43 / cg"
    "Modified: 9.5.1996 / 00:09:06 / cg"
!

lineWidth
    "return the lineWidth"

    ^ lineWidth

    "Created: 8.5.1996 / 23:22:04 / cg"
    "Modified: 9.5.1996 / 00:09:12 / cg"
!

lineWidth:aNumber
    "set the lineWidth"

    lineWidth := aNumber

    "Created: 8.5.1996 / 23:22:13 / cg"
    "Modified: 9.5.1996 / 00:09:17 / cg"
!

preferredBounds
    "return the components bounds as preferredBounds"

    ^ self bounds

    "Created: 8.5.1996 / 23:23:00 / cg"
    "Modified: 9.5.1996 / 00:09:31 / cg"
! !

!StrokingWrapper methodsFor:'displaying'!

displayOn:aGC
    "display myself - here, display the geometric object asStroked"

    |prevLineWidth prevFg|

    prevLineWidth := aGC lineWidth.
    prevFg := aGC paint.

    aGC lineWidth:lineWidth.
    aGC paint:fgColor.

    component displayStrokedOn:aGC.

    aGC lineWidth:prevLineWidth.
    aGC paint:prevFg.

    "Created: 8.5.1996 / 23:24:04 / cg"
    "Modified: 9.5.1996 / 00:11:17 / cg"
! !

!StrokingWrapper methodsFor:'initialization'!

initialize
    "default my lineWidth to one pixel"

    super initialize.
    lineWidth := 1.

    "Created: 8.5.1996 / 23:49:27 / cg"
    "Modified: 9.5.1996 / 00:11:51 / cg"
! !

!StrokingWrapper class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libview2/StrokingWrapper.st,v 1.5 1996-05-09 08:43:53 cg Exp $'
! !