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COPYRIGHT (c) 1991 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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View subclass:#Ruler
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instanceVariableNames:'fgColor metric paperWidth paperHeight'
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Interactors'
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!
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Ruler comment:'
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COPYRIGHT (c) 1991 by Claus Gittinger
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All Rights Reserved
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a Ruler for page layout.
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$Header: /cvs/stx/stx/libwidg2/Ruler.st,v 1.6 1994-08-05 01:24:05 claus Exp $
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written oct 91 by claus
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'!
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!Ruler methodsFor:'accessing'!
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metric:aSymbol
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"set the metric"
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metric := aSymbol.
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shown ifTrue:[
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self redraw
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]
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! !
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!Ruler methodsFor:'redrawing'!
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redraw
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"redraw scale"
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|x pixelPerMM pixelPerInch mod pos shortLen veryShortLen longLen charY
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top paperWidthMM paperWidthPixel xOrigin labelRight marg|
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self fill:viewBackground.
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xOrigin := viewOrigin x.
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paperWidthPixel := (self inchToPixel:paperWidth) rounded.
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(xOrigin + width > paperWidthPixel) ifTrue:[
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self paint:(Color darkGrey).
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self fillRectangleX:paperWidthPixel - xOrigin y:0
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width:(width - (paperWidthPixel - xOrigin)) height:height.
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self paint:fgColor.
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self displayLineFromX:paperWidthPixel - xOrigin y:0
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toX:paperWidthPixel - xOrigin y:height
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].
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self paint:fgColor.
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top := height - font height - font ascent.
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longLen := font height.
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shortLen := longLen // 2.
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charY := top + (font ascent) + shortLen.
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mod := 1.
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marg := 3. "character shift"
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(metric == #mm) ifTrue:[
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"centimeter - long blibs every centimeter; short ones every half"
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paperWidthMM := self inchToMillimeter:paperWidth.
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pixelPerMM := self millimeterToPixel:1.
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pos := 5.
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labelRight := marg + (font widthOf:'cm').
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x := (pixelPerMM * pos - xOrigin) rounded.
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[(x < width) and:[pos <= paperWidthMM]] whileTrue:[
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(mod == 1) ifTrue:[
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self displayLineFromX:x y:top
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toX:x y:(top + shortLen)
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] ifFalse:[
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x < labelRight ifFalse:[
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self displayLineFromX:x y:top
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toX:x y:(top + longLen).
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self displayString:(pos // 10) printString
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x:(x + marg)
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y:charY
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]
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].
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mod := (mod + 1) \\ 2.
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pos := pos + 5.
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x := (pixelPerMM * pos - xOrigin) rounded
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].
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self displayString:'cm ' x:marg y:charY.
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].
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(metric == #inch) ifTrue:[
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"inches - long blibs every inch; short ones every half; very
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short ones every quarter"
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pixelPerInch := self inchToPixel:1.
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pos := 0.25.
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labelRight := marg + (font widthOf:'inch').
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x := (pixelPerInch * pos - xOrigin) rounded.
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veryShortLen := longLen // 4.
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[(x < width) and:[pos <= paperWidth]] whileTrue:[
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(mod == 0) ifTrue:[
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x < labelRight ifFalse:[
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self displayLineFromX:x y:top
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toX:x y:(top + longLen).
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self displayString:pos asInteger printString
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x:(x + marg)
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y:charY
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]
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] ifFalse:[
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(mod == 2) ifTrue:[
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self displayLineFromX:x y:top
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toX:x y:(top + shortLen)
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] ifFalse:[
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self displayLineFromX:x y:top
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toX:x y:(top + veryShortLen)
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]
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].
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mod := (mod + 1) \\ 4.
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pos := pos + 0.25.
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x := (pixelPerInch * pos - xOrigin) rounded
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].
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self displayString:'inch ' x:marg y:charY.
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].
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self redrawEdges
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! !
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!Ruler methodsFor:'initialization'!
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initialize
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super initialize.
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fgColor := Black.
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self height:(font height + font descent + font descent).
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(Language == #english) ifTrue:[
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metric := #inch
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] ifFalse:[
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metric := #mm
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].
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paperWidth := 8.5.
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paperHeight := 11
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"Ruler new realize"
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! !
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!Ruler methodsFor:'metric conversions'!
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inchToMillimeter:inches
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"convert inches to mm"
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^ inches * 25.4
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!
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inchToPixel:inches
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"convert inches to screen pixels"
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^ inches * self horizontalPixelPerInch
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!
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inchToTwip:inches
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"convert inches to twips"
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^ inches * 1440
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!
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millimeterToPixel:mm
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"convert mms to screen pixels"
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^ mm * self horizontalPixelPerMillimeter
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!
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millimeterToInch:mm
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"convert mm to inches"
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^ mm / 25.4
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!
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pointToTwip:points
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"convert points to twips"
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^ points * 20
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!
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twipToInch:twips
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"convert twips to inches"
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^ twips / 1440.0
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!
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pixelToInch:pixels
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"convert pixels to inches"
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^ pixels / self horizontalPixelPerInch
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!
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twipToPixel:twips
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"convert twips to screen pixels"
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^ (twips / 1440.0) * self horizontalPixelPerInch
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!
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twipToPoint:twips
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"convert twips to points"
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^ twips / 20.0
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! !
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