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"
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COPYRIGHT (c) 1992 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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Object subclass:#GraphicsContext
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instanceVariableNames:'foreground background paint bgPaint
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function font
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lineStyle lineWidth
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joinStyle capStyle
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mask maskOrigin'
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classVariableNames:'White Black'
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poolDictionaries:''
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category:'Graphics-Support'
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!
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GraphicsContext comment:'
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COPYRIGHT (c) 1992 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libview/GraphicsContext.st,v 1.10 1994-08-05 01:14:14 claus Exp $
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'!
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GraphicsContext class instanceVariableNames:'DefaultFont'!
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!GraphicsContext class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1992 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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version
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"
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$Header: /cvs/stx/stx/libview/GraphicsContext.st,v 1.10 1994-08-05 01:14:14 claus Exp $
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"
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!
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documentation
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"
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this is an abstract superclass for all kinds of graphic drawables -
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both windows and printed pages (i.e. printers) are inheriting from
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this class (even drawables not at all associated with any device would do so).
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Drawing is done somewhat silly (due to being both backward compatible
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and supporting ST-80 messages). The paint instance describes the paint
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color, which can be (on monos) a dither pixmap drawn in foreground/background
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colors.
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Foreground and background are the underlying basic-colors, which must be
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real colors (i.e. non dithered). Direct access to fg/bg is discouraged, since
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in the future, foreground / background will be totally replaced by
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paint/bgPaint.
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All drawing is defined upon a few basic drawing methods, which must be
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implemented by subclasses (some subclasses also redefine the others for
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more performance)
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Instance variables:
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paint <Color> the paint used for drawing
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bgPaint <Color> the background used for drawing texts and bitmaps
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foreground <Color> the device foreground color used for drawing
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background <Color> the device background color used for drawing
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function <Symbol> the drawing function (i.e. #copy, #or, #xor ...)
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- not all Drawables support every function
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(i.e. paper only allows #copy)
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font <Font> the font currently used for drawing
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lineStyle <Symbol> the lineStyle (i.e. #solid, #dashed, #doubleDashed)
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lineWidth <SmallInteger> the lineWidth (device dependent, usually pixels)
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joinStyle <Symbol> the style in which lines (in polygons)
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are joined (i.e. #miter, #bevel, #round)
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capStyle <Symbol> the style in which the last point
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of a line is drawn
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(i.e. #notLast, #butt, #round, #projecting)
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mask <Form> a mask used for drawing
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- not all Drawables support it
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maskOrigin <Point> the origin of the mask relative to
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the drawables origin
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Class variables:
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White <Color> cached white color - its needed so often
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Black <Color> cached black color - its needed so often
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Class instance variables:
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DefaultFont <Font> default font to use
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"
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! !
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!GraphicsContext class methodsFor:'initialization'!
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initialize
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"setup some defaults - these are usually redefined
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during startup."
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Color isNil ifTrue:[^ self].
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Color initialize.
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White := Color white on:Display.
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Black := Color black on:Display.
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Font initialize.
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DefaultFont := Font family:'courier' face:'medium' style:'roman' size:12
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! !
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!GraphicsContext class methodsFor:'accessing defaults'!
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defaultFont:aFont
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"set the default font used for drawing"
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DefaultFont := aFont
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!
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defaultFont
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"get the default font used for drawing"
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^ DefaultFont
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! !
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!GraphicsContext class methodsFor:'constants'!
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joinRound
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"return a constant to specify round join"
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^ #round
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!
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joinMiter
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"return a constant to specify miter join"
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^ #miter
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!
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joinBevel
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"return a constant to specify bevel join"
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^ #bevel
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!
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capNotLast
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"return a constant to specify not-last cap"
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^ #notLast
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!
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capProjecting
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"return a constant to specify projecting cap"
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^ #projecting
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!
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capRound
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"return a constant to specify round cap"
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^ #round
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!
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capButt
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"return a constant to specify butt cap"
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^ #butt
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! !
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!GraphicsContext class methodsFor:'instance creation'!
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new
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^ self basicNew initialize
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! !
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!GraphicsContext methodsFor:'initialization'!
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initialize
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"set up some useful default values"
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"default is drawing black-on-white;
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since these two colors are needed very often, cache them here"
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"
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White isNil ifTrue:[White := Color white].
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Black isNil ifTrue:[Black := Color black].
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"
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paint := Black.
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bgPaint := White.
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foreground := Black.
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background := White.
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function := #copy.
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lineWidth := 1.
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lineStyle := #solid.
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joinStyle := #miter.
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capStyle := #butt.
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self initFont
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!
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initFont
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|aFont|
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aFont := self class defaultFont.
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"this is a kludge"
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aFont isNil ifTrue:[
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self class initialize.
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aFont := self class defaultFont.
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].
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aFont notNil ifTrue:[
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font := aFont
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]
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! !
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!GraphicsContext methodsFor:'misc'!
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flush
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"st-80 compatibility"
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^ self
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! !
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!GraphicsContext methodsFor:'accessing'!
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paint
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"return the current paint drawing color"
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^ paint
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!
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paint:aColor
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"set the drawing painting color, aColor can be a dithered one"
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paint := aColor
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!
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paint:fgColor on:bgColor
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"set the paint used for text and bitmaps, both colors may be
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dithered colors"
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2
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paint := fgColor.
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bgPaint := bgColor
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!
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backgroundPaint
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"return the background paint color.
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(used for opaqueForms and opaqueStrings)"
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^ bgPaint
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!
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backgroundPaint:aColor
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"set the background painting color (which is used for
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opaqueForms and opaqueStrings). aColor can be a dithered one."
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^ self subclassResponsibility
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!
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foreground
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"return the current foreground drawing color"
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^ foreground
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!
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foreground:aColor
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"set the drawing foreground color.
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aColor MUST be a real (i.e. device-) color"
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foreground := aColor
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!
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background
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"return the current background drawing color"
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^ background
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!
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288 |
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background:aColor
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"set the drawing background color.
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aColor MUST be a real (i.e. device-) color"
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2
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293 |
background := aColor
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!
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function
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"return the current drawing function"
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^ function
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!
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301 |
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function:aFunctionSymbol
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"set the drawing function"
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304 |
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^ self subclassResponsibility
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!
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307 |
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foreground:fgColor background:bgColor
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"set both foreground and background colors"
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310 |
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self foreground:fgColor.
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self background:bgColor
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313 |
!
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314 |
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315 |
foreground:fgColor background:bgColor function:f
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"set foreground, background colors and function"
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317 |
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self foreground:fgColor.
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self background:bgColor.
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self function:f
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321 |
!
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322 |
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323 |
lineWidth
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324 |
"return the current drawing linewidth"
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325 |
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^ lineWidth
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327 |
!
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328 |
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329 |
lineWidth:aNumber
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|
330 |
"set the line drawing width in pixels"
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331 |
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2
|
332 |
lineWidth := aNumber
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0
|
333 |
!
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334 |
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335 |
lineStyle
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|
336 |
"return the current line-drawing-style"
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337 |
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|
338 |
^ lineStyle
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|
339 |
!
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340 |
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341 |
lineStyle:aStyleSymbol
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|
342 |
"set the line-drawing-style;
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|
343 |
possible styles are: #solid, #dashed, #doubleDashed"
|
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|
344 |
|
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2
|
345 |
lineStyle := aStyleSymbol
|
|
0
|
346 |
!
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347 |
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348 |
capStyle
|
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|
349 |
"return the current cap-style for line-drawing"
|
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350 |
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|
351 |
^ capStyle
|
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|
352 |
!
|
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353 |
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354 |
capStyle:aStyleSymbol
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|
355 |
"set the cap-style for line-drawing;
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|
356 |
possible styles are: #notLast, #butt, #round, #projecting"
|
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|
357 |
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|
358 |
^ self subclassResponsibility
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|
359 |
!
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360 |
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361 |
joinStyle
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|
362 |
"return the current join-style for polygon-drawing"
|
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|
363 |
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|
364 |
^ joinStyle
|
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|
365 |
!
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|
366 |
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367 |
joinStyle:aStyleSymbol
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|
368 |
"set the join-style of lines in polygon-drawing;
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|
369 |
possible styles are: #miter, #bevel, #round"
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370 |
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|
371 |
^ self subclassResponsibility
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372 |
!
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373 |
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374 |
mask
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|
375 |
"return the current drawing mask"
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376 |
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|
377 |
^ mask
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|
378 |
!
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379 |
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380 |
mask:aForm
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|
381 |
"set the drawing mask"
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382 |
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383 |
^ self subclassResponsibility
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|
384 |
!
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385 |
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386 |
font
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|
387 |
"return the current drawing font"
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388 |
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|
389 |
^ font
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390 |
!
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391 |
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392 |
font:aFont
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|
393 |
"set the drawing font"
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394 |
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395 |
^ self subclassResponsibility
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396 |
!
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397 |
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398 |
clipRect:aRectangle
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|
399 |
"set the drawing clip-rectangle"
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400 |
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401 |
^ self subclassResponsibility
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402 |
!
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403 |
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404 |
graphicsContext
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405 |
"for ST-80 compatibility"
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406 |
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|
407 |
^ self
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2
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408 |
!
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409 |
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410 |
viewOrigin
|
|
12
|
411 |
"return the drawables visible origin (for scrolling)"
|
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412 |
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2
|
413 |
^ 0@0
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|
414 |
!
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415 |
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12
|
416 |
setMaskOrigin:aPoint
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|
417 |
^ self
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|
418 |
!
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419 |
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2
|
420 |
setMaskOriginX:x y:y
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|
421 |
^ self
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|
422 |
!
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|
|
423 |
|
|
|
424 |
withPattern:aForm do:aBlock
|
|
46
|
425 |
'pattern drawing not implemented' errorPrintNewline.
|
|
2
|
426 |
aBlock value
|
|
0
|
427 |
! !
|
|
|
428 |
|
|
|
429 |
!GraphicsContext methodsFor:'displaying'!
|
|
|
430 |
|
|
|
431 |
displayRectangularBorder:aRectangle at:aPoint
|
|
|
432 |
"draw a rectangle - ST-80 compatibility"
|
|
|
433 |
|
|
26
|
434 |
self displayRectangle:(aRectangle translateBy:aPoint)
|
|
0
|
435 |
!
|
|
|
436 |
|
|
|
437 |
displayLineFrom:startPoint to:endPoint translateBy:anOffset
|
|
|
438 |
"draw a line - ST-80 compatibility"
|
|
|
439 |
|
|
|
440 |
self displayLineFrom:(startPoint + anOffset)
|
|
|
441 |
to:(endPoint + anOffset)
|
|
|
442 |
!
|
|
|
443 |
|
|
|
444 |
displayPolyline:aPolygon
|
|
|
445 |
"draw a polygon - ST-80 compatibility"
|
|
|
446 |
|
|
35
|
447 |
|poly|
|
|
|
448 |
|
|
|
449 |
poly := aPolygon collect:[:pount | pount rounded].
|
|
|
450 |
self displayPolygon:poly
|
|
|
451 |
!
|
|
|
452 |
|
|
|
453 |
displayArcBoundedBy:boundingBox startAngle:startAngle sweepAngle:sweepAngle at:origin
|
|
|
454 |
"draw an arc/circle/ellipse - ST-80 compatibility"
|
|
0
|
455 |
|
|
35
|
456 |
^ self displayArcX:(boundingBox left + origin x)
|
|
|
457 |
y:(boundingBox top + origin y)
|
|
|
458 |
width:(boundingBox width)
|
|
|
459 |
height:(boundingBox height)
|
|
|
460 |
from:startAngle
|
|
|
461 |
angle:sweepAngle
|
|
|
462 |
!
|
|
|
463 |
|
|
|
464 |
displayWedgeBoundedBy:boundingBox startAngle:startAngle sweepAngle:sweepAngle at:origin
|
|
|
465 |
"fill an arc/circle/ellipse - ST-80 compatibility"
|
|
|
466 |
|
|
|
467 |
^ self fillArcX:(boundingBox left + origin x)
|
|
|
468 |
y:(boundingBox top + origin y)
|
|
|
469 |
width:(boundingBox width)
|
|
|
470 |
height:(boundingBox height)
|
|
|
471 |
from:startAngle
|
|
|
472 |
angle:sweepAngle
|
|
0
|
473 |
! !
|
|
|
474 |
|
|
|
475 |
!GraphicsContext methodsFor:'bit-blitting'!
|
|
|
476 |
|
|
|
477 |
copyFrom:aGraphicContext x:srcX y:srcY toX:dstX y:dstY width:w height:h
|
|
|
478 |
"copy from a drawable - maybe self"
|
|
|
479 |
|
|
|
480 |
^ self subclassResponsibility
|
|
|
481 |
!
|
|
|
482 |
|
|
|
483 |
copyFrom:aGraphicContext x:dstX y:dstY width:w height:h
|
|
|
484 |
"copy from a drawable - maybe self"
|
|
|
485 |
|
|
|
486 |
self copyFrom:aGraphicContext x:0 y:0 toX:dstX y:dstY width:w height:h
|
|
|
487 |
! !
|
|
|
488 |
|
|
|
489 |
!GraphicsContext methodsFor:'basic filling'!
|
|
|
490 |
|
|
|
491 |
fillPolygon:points
|
|
|
492 |
"fill a polygon with current paint color"
|
|
|
493 |
|
|
|
494 |
^ self subclassResponsibility
|
|
|
495 |
!
|
|
|
496 |
|
|
|
497 |
fillRectangleX:x y:y width:w height:h
|
|
|
498 |
"fill a rectangle with current paint color"
|
|
|
499 |
|
|
|
500 |
^ self subclassResponsibility
|
|
|
501 |
!
|
|
|
502 |
|
|
|
503 |
fillArcX:x y:y w:w h:h from:start angle:angle
|
|
|
504 |
"fill an arc with current paint color"
|
|
|
505 |
|
|
|
506 |
^ self subclassResponsibility
|
|
|
507 |
! !
|
|
|
508 |
|
|
|
509 |
!GraphicsContext methodsFor:'filling'!
|
|
|
510 |
|
|
|
511 |
fillRectangle:aRectangle
|
|
|
512 |
"fill a rectangle with current paint color"
|
|
|
513 |
|
|
|
514 |
self fillRectangleX:(aRectangle left)
|
|
|
515 |
y:(aRectangle top)
|
|
|
516 |
width:(aRectangle width)
|
|
|
517 |
height:(aRectangle height)
|
|
|
518 |
!
|
|
|
519 |
|
|
|
520 |
fillCircle:aPoint radius:aNumber
|
|
|
521 |
"draw a filled circle"
|
|
|
522 |
|
|
|
523 |
self fillCircleX:(aPoint x) y:(aPoint y) radius:aNumber
|
|
|
524 |
!
|
|
|
525 |
|
|
|
526 |
fillCircleX:x y:y radius:r
|
|
|
527 |
"draw a filled circle"
|
|
|
528 |
|
|
|
529 |
|d|
|
|
|
530 |
d := 2 * r.
|
|
|
531 |
self fillArcX:(x - r) y:(y - r) w:d h:d from:0 angle:360
|
|
|
532 |
! !
|
|
|
533 |
|
|
|
534 |
!GraphicsContext methodsFor:'basic drawing'!
|
|
|
535 |
|
|
26
|
536 |
displayPolygon:aPolygon
|
|
0
|
537 |
"draw a polygon
|
|
|
538 |
- this could be recoded to draw using displayLine"
|
|
|
539 |
|
|
|
540 |
^ self subclassResponsibility
|
|
|
541 |
!
|
|
|
542 |
|
|
12
|
543 |
displayArcX:x y:y w:width h:height from:startAngle angle:angle
|
|
0
|
544 |
"draw an arc in a box
|
|
|
545 |
- this could be recoded to draw using displayLine"
|
|
|
546 |
|
|
|
547 |
^ self subclassResponsibility
|
|
|
548 |
!
|
|
|
549 |
|
|
26
|
550 |
displayRectangleX:x y:y width:w height:h
|
|
0
|
551 |
"draw a rectangle
|
|
|
552 |
- this could be recoded to draw using displayLine"
|
|
|
553 |
|
|
|
554 |
^ self subclassResponsibility
|
|
|
555 |
!
|
|
|
556 |
|
|
26
|
557 |
displayForm:aForm x:x y:y
|
|
0
|
558 |
"draw a form at x/y; if the form has depth 1, 1's in the form are
|
|
|
559 |
drawn in current fg, 0's are ignored.
|
|
24
|
560 |
If the form has depth ~~ 1, the result is undefined"
|
|
|
561 |
|
|
|
562 |
|fg bg f|
|
|
|
563 |
|
|
|
564 |
fg := foreground.
|
|
|
565 |
bg := background.
|
|
|
566 |
f := function.
|
|
0
|
567 |
|
|
24
|
568 |
self foreground:(Color noColor) background:(Color allColor) function:#and.
|
|
26
|
569 |
self displayOpaqueForm:aForm x:x y:y.
|
|
24
|
570 |
self foreground:fg background:(Color noColor) function:#or.
|
|
26
|
571 |
self displayOpaqueForm:aForm x:x y:y.
|
|
24
|
572 |
self foreground:fg background:fg function:f.
|
|
0
|
573 |
!
|
|
|
574 |
|
|
26
|
575 |
displayOpaqueForm:aForm x:x y:y
|
|
0
|
576 |
"draw a form at x/y; if the form has depth 1, 1's in the form are
|
|
|
577 |
drawn in current fg, 0's in current bg color.
|
|
|
578 |
If the form has depth ~~ 1, it is copied as is onto the receiver"
|
|
|
579 |
|
|
|
580 |
^ self subclassResponsibility
|
|
|
581 |
!
|
|
|
582 |
|
|
|
583 |
displayOpaqueString:aString from:index1 to:index2 x:x y:y
|
|
|
584 |
"draw part of a string with both fg and bg at x/y in current font"
|
|
|
585 |
|
|
|
586 |
^ self subclassResponsibility
|
|
|
587 |
!
|
|
|
588 |
|
|
|
589 |
displayString:aString from:index1 to:index2 x:x y:y
|
|
|
590 |
"draw part of a string with fg at x/y in current font"
|
|
|
591 |
|
|
|
592 |
^ self subclassResponsibility
|
|
|
593 |
! !
|
|
|
594 |
|
|
|
595 |
!GraphicsContext methodsFor:'drawing'!
|
|
|
596 |
|
|
|
597 |
displayOpaqueString:aString x:x y:y
|
|
|
598 |
"draw a string with both fg and bg"
|
|
|
599 |
|
|
|
600 |
self displayOpaqueString:aString from:1 to:(aString size) x:x y:y
|
|
|
601 |
!
|
|
|
602 |
|
|
|
603 |
displayOpaqueString:aString at:aPoint
|
|
|
604 |
"draw a string with both fg and bg"
|
|
|
605 |
|
|
|
606 |
self displayOpaqueString:aString x:(aPoint x) y:(aPoint y)
|
|
|
607 |
!
|
|
|
608 |
|
|
|
609 |
displayString:aString x:x y:y
|
|
|
610 |
"draw a string - drawing fg only"
|
|
|
611 |
|
|
|
612 |
self displayString:aString from:1 to:(aString size) x:x y:y
|
|
|
613 |
!
|
|
|
614 |
|
|
|
615 |
displayString:aString at:aPoint
|
|
|
616 |
"draw a string - drawing fg only"
|
|
|
617 |
|
|
|
618 |
self displayString:aString x:aPoint x y:aPoint y
|
|
|
619 |
!
|
|
|
620 |
|
|
24
|
621 |
displayPointX:x y:y
|
|
0
|
622 |
"draw a point at x/y"
|
|
|
623 |
|
|
|
624 |
self displayLineFromX:x y:y toX:x y:y
|
|
|
625 |
!
|
|
|
626 |
|
|
24
|
627 |
displayPoint:aPoint
|
|
0
|
628 |
"draw a pixel"
|
|
|
629 |
|
|
24
|
630 |
self displayPointX:(aPoint x) y:(aPoint y)
|
|
0
|
631 |
!
|
|
|
632 |
|
|
|
633 |
displayLineFrom:point1 to:point2
|
|
|
634 |
"draw a line"
|
|
|
635 |
|
|
|
636 |
self displayLineFromX:(point1 x) y:(point1 y)
|
|
|
637 |
toX:(point2 x) y:(point2 y)
|
|
|
638 |
!
|
|
|
639 |
|
|
26
|
640 |
displayRectangle:aRectangle
|
|
0
|
641 |
"draw a rectangle"
|
|
|
642 |
|
|
26
|
643 |
self displayRectangleX:(aRectangle left)
|
|
|
644 |
y:(aRectangle top)
|
|
|
645 |
width:(aRectangle width)
|
|
|
646 |
height:(aRectangle height)
|
|
0
|
647 |
!
|
|
|
648 |
|
|
26
|
649 |
displayRectangleOrigin:origin corner:corner
|
|
0
|
650 |
"draw a rectangle"
|
|
|
651 |
|
|
|
652 |
|top left|
|
|
|
653 |
|
|
|
654 |
left := origin x.
|
|
|
655 |
top := origin y.
|
|
26
|
656 |
self displayRectangleX:left y:top
|
|
|
657 |
width:(corner x - left)
|
|
|
658 |
height:(corner y - top)
|
|
0
|
659 |
!
|
|
|
660 |
|
|
26
|
661 |
displayForm:aForm at:aPoint
|
|
0
|
662 |
"draw a form"
|
|
|
663 |
|
|
26
|
664 |
self displayForm:aForm x:(aPoint x) y:(aPoint y)
|
|
0
|
665 |
!
|
|
|
666 |
|
|
12
|
667 |
displayArcIn:aRectangle from:startAngle angle:angle
|
|
|
668 |
"draw an arc in a box"
|
|
0
|
669 |
|
|
12
|
670 |
self displayArcX:(aRectangle left)
|
|
|
671 |
y:(aRectangle top)
|
|
|
672 |
w:(aRectangle width)
|
|
|
673 |
h:(aRectangle height)
|
|
|
674 |
from:startAngle
|
|
|
675 |
angle:angle
|
|
0
|
676 |
!
|
|
|
677 |
|
|
12
|
678 |
displayArcOrigin:origin corner:corner from:startAngle angle:angle
|
|
|
679 |
"draw an arc in a box"
|
|
0
|
680 |
|
|
|
681 |
|left top right bot|
|
|
|
682 |
|
|
|
683 |
left := origin x.
|
|
|
684 |
top := origin y.
|
|
|
685 |
right := corner x.
|
|
|
686 |
bot := corner y.
|
|
12
|
687 |
self displayArcX:left y:top
|
|
|
688 |
w:(right - left + 1) h:(bot - top + 1)
|
|
|
689 |
from:startAngle angle:angle
|
|
0
|
690 |
!
|
|
|
691 |
|
|
12
|
692 |
displayCircleIn:aRectangle
|
|
0
|
693 |
"draw a circle in a box"
|
|
|
694 |
|
|
|
695 |
self
|
|
12
|
696 |
displayArcX:(aRectangle left)
|
|
|
697 |
y:(aRectangle top)
|
|
|
698 |
w:(aRectangle width)
|
|
|
699 |
h:(aRectangle height)
|
|
|
700 |
from:0 angle:360
|
|
0
|
701 |
!
|
|
|
702 |
|
|
12
|
703 |
displayCircle:aPoint radius:r
|
|
|
704 |
"draw a circle around a center point"
|
|
0
|
705 |
|
|
12
|
706 |
self displayCircleX:(aPoint x) y:(aPoint y) radius:r
|
|
0
|
707 |
!
|
|
|
708 |
|
|
12
|
709 |
displayCircleX:x y:y radius:r
|
|
|
710 |
"draw a circle around a center point"
|
|
0
|
711 |
|
|
|
712 |
|d|
|
|
|
713 |
d := 2 * r.
|
|
12
|
714 |
self displayArcX:(x - r) y:(y - r)
|
|
|
715 |
w:d h:d
|
|
|
716 |
from:0 angle:360
|
|
0
|
717 |
! !
|