| What | can2svg.tcl |
| Description | Package from the coccinella application. Provides translation from canvas commands to XML/SVG format. |
| Where | can2svg.tcl |
| Requires | uriencode.tcl |
| Updated | 24.02.2010 |
# can2svg.tcl ---
#
# This file provides translation from canvas commands to XML/SVG format.
#
# Copyright (c) 2002-2007 Mats Bengtsson
#
# This file is distributed under BSD style license.
#
# $Id: can2svg.tcl,v 1.26 2008-01-27 08:19:36 matben Exp $
#
# ########################### USAGE ############################################
#
# NAME
# can2svg - translate canvas command to SVG.
#
# SYNOPSIS
# can2svg canvasCmd ?options?
# canvasCmd is everything except the widget path name.
#
# can2svg::canvas2file widgetPath fileName ?options?
# options: -height
# -width
#
# can2svg::can2svg canvasCmd ?options?
# options: -httpbasedir path
# -imagehandler tclProc
# -ovalasellipse 0|1
# -reusedefs 0|1
# -uritype file|http
# -usestyleattribute 0|1
# -usetags 0|all|first|last
# -windowitemhandler tclProc
#
# can2svg::config ?options?
# options: -allownewlines 0
# -filtertags ""
# -httpaddr localhost
# -ovalasellipse 0
# -reusedefs 1
# -uritype file
# -usetags all
# -usestyleattribute 1
# -windowitemhandler tclProc
#
# ########################### CHANGES ##########################################
#
# 0.1 first release
# 0.2 URI encoded image file path
# 0.3 uses xmllists more, added svgasxmllist
#
# ########################### TODO #############################################
#
# handle units (m->mm etc.)
# better support for stipple patterns
# how to handle tk editing? DOM?
#
# ...
# We need URN encoding for the file path in images. From my whiteboard code.
package require uriencode
package require tinyfileutils
package provide can2svg 0.3
namespace eval can2svg {
namespace export can2svg canvas2file
variable confopts
array set confopts {
-allownewlines 0
-filtertags ""
-httpaddr localhost
-ovalasellipse 0
-reusedefs 1
-uritype file
-usetags all
-usestyleattribute 1
-windowitemhandler ""
}
set confopts(-httpbasedir) [info script]
variable formatArrowMarker
variable formatArrowMarkerLast
# The key into this array is 'arrowMarkerDef_$col_$a_$b_$c', where
# col is color, and a, b, c are the arrow's shape.
variable defsArrowMarkerArr
# Similarly for stipple patterns.
variable defsStipplePatternArr
# This shouldn't be hardcoded!
variable defaultFont {Helvetica 12}
variable pi 3.14159265359
variable anglesToRadians [expr $pi/180.0]
variable grayStipples {gray75 gray50 gray25 gray12}
# Make 4x4 squares. Perhaps could be improved.
variable stippleDataArr
set stippleDataArr(gray75) \
{M 0 0 h3 M 0 1 h1 M 2 1 h2
M 0 2 h3 M 0 3 h1 M 2 3 h1}
set stippleDataArr(gray50) \
{M 0 0 h1 M 2 0 h1 M 1 1 h1 M 3 1 h1
M 0 2 h1 M 2 2 h1 M 1 3 h1 M 3 3 h1}
set stippleDataArr(gray25) \
{M 3 0 h1 M 1 1 h1 M 3 2 h1 M 1 3 h1}
set stippleDataArr(gray12) \
{M 1 1 h1 M 3 3 h1}
}
proc can2svg::config {args} {
variable confopts
set options [lsort [array names confopts -*]]
set usage [join $options ", "]
if {[llength $args] == 0} {
set result {}
foreach name $options {
lappend result $name $confopts($name)
}
return $result
}
regsub -all -- - $options {} options
set pat ^-([join $options |])$
if {[llength $args] == 1} {
set flag [lindex $args 0]
if {[regexp -- $pat $flag]} {
return $confopts($flag)
} else {
return -code error "Unknown option $flag, must be: $usage"
}
} else {
foreach {flag value} $args {
if {[regexp -- $pat $flag]} {
set confopts($flag) $value
} else {
return -code error "Unknown option $flag, must be: $usage"
}
}
}
}
# can2svg::can2svg --
#
# Make xml out of a canvas command, widgetPath removed.
#
# Arguments:
# cmd canvas create commands without prepending widget path.
# args -httpbasedir path
# -imagehandler tclProc
# -ovalasellipse 0|1
# -reusedefs 0|1
# -uritype file|http
# -usestyleattribute 0|1
# -usetags 0|all|first|last
#
# Results:
# xml data
proc can2svg::can2svg {cmd args} {
set xml ""
foreach xmllist [eval {svgasxmllist $cmd} $args] {
append xml [MakeXML $xmllist]
}
return $xml
}
# can2svg::svgasxmllist --
#
# Make a list of xmllists out of a canvas command, widgetPath removed.
#
# Arguments:
# cmd canvas create command without prepending widget path.
# args -httpbasedir path
# -imagehandler tclProc
# -ovalasellipse 0|1
# -reusedefs 0|1
# -uritype file|http
# -usestyleattribute 0|1
# -usetags 0|all|first|last
#
# Results:
# a list of xmllist = {tag attrlist isempty cdata {child1 child2 ...}}
proc can2svg::svgasxmllist {cmd args} {
variable confopts
variable defsArrowMarkerArr
variable defsStipplePatternArr
variable defaultFont
variable grayStipples
set nonum_ {[^0-9]}
set wsp_ {[ ]+}
set xmlLL [list]
array set argsA [array get confopts]
array set argsA $args
set args [array get argsA]
if {![string equal [lindex $cmd 0] "create"]} {
return
}
set type [lindex $cmd 1]
set rest [lrange $cmd 2 end]
# Separate coords from options.
set indopt [lsearch -regexp $rest "-${nonum_}"]
if {$indopt < 0} {
set ind end
set opts [list]
} else {
set ind [expr $indopt - 1]
set opts [lrange $rest $indopt end]
}
# Flatten coordinate list!
set coo [lrange $rest 0 $ind]
if {[llength $coo] == 1} {
set coo [lindex $coo 0]
}
array set optA $opts
# Is the item in normal state? If not, return.
if {[info exists optA(-state)] && $optA(-state) != "normal"} {
return
}
# Figure out if we've got a spline.
set haveSpline 0
if {[info exists optA(-smooth)] && ($optA(-smooth) != "0") && \
[info exists optA(-splinesteps)] && ($optA(-splinesteps) > 2)} {
set haveSpline 1
}
if {[info exists optA(-fill)]} {
set fillValue $optA(-fill)
if {![regexp {#[0-9]+} $fillValue]} {
set fillValue [FormatColorName $fillValue]
}
} else {
set fillValue black
}
if {[string length $argsA(-filtertags)] && [info exists optA(-tags)]} {
set tag [uplevel #0 $argsA(-filtertags) [list $optA(-tags)]]
set idAttr [list id $tag]
} elseif {($argsA(-usetags) != "0") && [info exists optA(-tags)]} {
# Remove any 'current' tag.
set optA(-tags) \
[lsearch -all -not -inline $optA(-tags) current]
switch -- $argsA(-usetags) {
all {
set idAttr [list id $optA(-tags)]
}
first {
set idAttr [list id [lindex $optA(-tags) 0]]
}
last {
set idAttr [list id [lindex $optA(-tags) end]]
}
}
} else {
set idAttr ""
}
# If we need a marker (arrow head) need to make that first.
if {[info exists optA(-arrow)] && ![string equal $optA(-arrow) "none"]} {
if {[info exists optA(-arrowshape)]} {
# Make a key of the arrowshape list into the array.
regsub -all -- $wsp_ $optA(-arrowshape) _ shapeKey
set arrowKey ${fillValue}_${shapeKey}
set arrowShape $optA(-arrowshape)
} else {
set arrowKey ${fillValue}
set arrowShape {8 10 3}
}
if {!$argsA(-reusedefs) || \
![info exists defsArrowMarkerArr($arrowKey)]} {
set defsArrowMarkerArr($arrowKey) \
[eval {MakeArrowMarker} $arrowShape {$fillValue}]
set xmlLL \
[concat $xmlLL $defsArrowMarkerArr($arrowKey)]
}
}
# If we need a stipple bitmap, need to make that first. Limited!!!
# Only: gray12, gray25, gray50, gray75
foreach key {-stipple -outlinestipple} {
if {[info exists optA($key)] && \
([lsearch $grayStipples $optA($key)] >= 0)} {
set stipple $optA($key)
if {![info exists defsStipplePatternArr($stipple)]} {
set defsStipplePatternArr($stipple) \
[MakeGrayStippleDef $stipple]
}
lappend xmlLL $defsStipplePatternArr($stipple)
}
}
puts "can2svg::svgasxmllist cmd=$cmd, args=$args"
switch -- $type {
arc {
# Had to do it the hard way! (?)
# "Wrong" coordinate system :-(
set attr [CoordsToAttr $type $coo $opts elem]
if {[string length $idAttr] > 0} {
set attr [concat $attr $idAttr]
}
set attr [concat $attr [MakeAttrList \
$type $opts $argsA(-usestyleattribute)]]
lappend xmlLL [MakeXMLList $elem -attrlist $attr]
}
bitmap - image {
if {[info exists optA(-image)]} {
set elem "image"
set attr [eval {MakeImageAttr $coo $opts} $args]
if {[string length $idAttr] > 0} {
set attr [concat $attr $idAttr]
}
set subEs [list]
if {[info exists argsA(-imagehandler)]} {
set subE [uplevel #0 $argsA(-imagehandler) [list $cmd] $args]
if {[llength $subE]} {
set subEs [list $subE]
}
}
lappend xmlLL [MakeXMLList $elem -attrlist $attr -subtags $subEs]
}
}
line {
set attr [CoordsToAttr $type $coo $opts elem]
if {[string length $idAttr] > 0} {
set attr [concat $attr $idAttr]
}
set attr [concat $attr [MakeAttrList \
$type $opts $argsA(-usestyleattribute)]]
lappend xmlLL [MakeXMLList $elem -attrlist $attr]
}
oval {
set attr [CoordsToAttr $type $coo $opts elem]
foreach {x y w h} [NormalizeRectCoords $coo] break
if {[expr $w == $h] && !$argsA(-ovalasellipse)} {
# set elem "circle";# circle needs an r: not an rx & ry
set elem "ellipse"
} else {
set elem "ellipse"
}
if {[string length $idAttr] > 0} {
set attr [concat $attr $idAttr]
}
set attr [concat $attr [MakeAttrList \
$type $opts $argsA(-usestyleattribute)]]
lappend xmlLL [MakeXMLList $elem -attrlist $attr]
}
polygon {
set attr [CoordsToAttr $type $coo $opts elem]
if {[string length $idAttr] > 0} {
set attr [concat $attr $idAttr]
}
set attr [concat $attr [MakeAttrList \
$type $opts $argsA(-usestyleattribute)]]
lappend xmlLL [MakeXMLList $elem -attrlist $attr]
}
rectangle {
set attr [CoordsToAttr $type $coo $opts elem]
if {[string length $idAttr] > 0} {
set attr [concat $attr $idAttr]
}
set attr [concat $attr [MakeAttrList \
$type $opts $argsA(-usestyleattribute)]]
lappend xmlLL [MakeXMLList $elem -attrlist $attr]
}
text {
set elem "text"
set chdata ""
set nlines 1
if {[info exists optA(-font)]} {
set theFont $optA(-font)
} else {
set theFont $defaultFont
}
set ascent [font metrics $theFont -ascent]
set lineSpace [font metrics $theFont -linespace]
if {[info exists optA(-text)]} {
set chdata $optA(-text)
if {[info exists optA(-width)]} {
# MICK O'DONNELL: if the text is wrapped in the wgt, we need
# to simulate linebreaks
#
# If the item has got -width != 0 then we must wrap it ourselves
# using newlines since the -text does not have extra newlines
# at these linebreaks.
set lines [split $chdata \n]
set newlines {}
foreach line $lines {
set lines2 [SplitWrappedLines $line $theFont $optA(-width)]
set newlines [concat $newlines $lines2]
}
set chdata [join $newlines \n]
if {!$argsA(-allownewlines) || \
([llength $newlines] > [llength $lines])} {
set nlines [expr [regexp -all "\n" $chdata] + 1]
}
} else {
if {!$argsA(-allownewlines)} {
set nlines [expr [regexp -all "\n" $chdata] + 1]
}
}
}
# Figure out the coords of the first baseline.
set anchor center
if {[info exists optA(-anchor)]} {
set anchor $optA(-anchor)
}
foreach {xbase ybase} \
[GetTextSVGCoords $coo $anchor $chdata $theFont $nlines] {}
set attr [list "x" $xbase "y" $ybase]
# angle is negated in order to fit
# canvas coordinate system
if {[info exists optA(-angle)]} {
set ang [expr {-1.0*$optA(-angle)}]
set val "rotate($ang $xbase,$ybase)"
lappend attr "transform" $val
}
if {[string length $idAttr] > 0} {
set attr [concat $attr $idAttr]
}
set attr [concat $attr [MakeAttrList \
$type $opts $argsA(-usestyleattribute)]]
set dy 0
if {$nlines > 1} {
# Use the 'tspan' trick here.
set subList {}
foreach line [split $chdata "\n"] {
lappend subList [MakeXMLList "tspan" \
-attrlist [list "x" $xbase "dy" $dy] -chdata $line]
set dy $lineSpace
}
lappend xmlLL [MakeXMLList $elem -attrlist $attr \
-subtags $subList]
} else {
lappend xmlLL [MakeXMLList $elem -attrlist $attr \
-chdata $chdata]
}
}
window {
# There is no svg for this; must be handled by application layer.
#puts "window: $cmd"
if {[string length $argsA(-windowitemhandler)]} {
set xmllist \
[uplevel #0 $argsA(-windowitemhandler) [list $cmd] $args]
if {[llength $xmllist]} {
lappend xmlLL $xmllist
}
}
}
}
return $xmlLL
}
# can2svg::CoordsToAttr --
#
# Makes a list of attributes corresponding to type and coords.
#
# Arguments:
#
#
# Results:
# a list of attributes.
proc can2svg::CoordsToAttr {type coo opts svgElementVar} {
upvar $svgElementVar elem
array set optA $opts
# Figure out if we've got a spline.
set haveSpline 0
if {[info exists optA(-smooth)] && ($optA(-smooth) != "0") && \
[info exists optA(-splinesteps)] && ($optA(-splinesteps) > 2)} {
set haveSpline 1
}
set attr {}
switch -- $type {
arc {
set elem "path"
set data [MakeArcPath $coo $opts]
set attr [list "d" $data]
}
bitmap - image {
array set __optA $opts
if {[info exists __optA(-image)]} {
set elem "image"
set attr [ImageCoordsToAttr $coo $opts]
}
}
line {
if {$haveSpline} {
set elem "path"
set data [ParseSplineToPath $type $coo]
set attr [list "d" $data]
} else {
set elem "polyline"
set attr [list "points" $coo]
}
}
oval {
# Assume SVG ellipse.
set elem "ellipse"
foreach {x y w h} [NormalizeRectCoords $coo] break
set attr [list \
"cx" [expr $x + $w/2.0] "cy" [expr $y + $h/2.0] \
"rx" [expr $w/2.0] "ry" [expr $h/2.0]]
}
polygon {
if {$haveSpline} {
set elem "path"
set data [ParseSplineToPath $type $coo]
set attr [list "d" $data]
} else {
set elem "polygon"
set attr [list "points" $coo]
}
}
rectangle {
set elem "rect"
foreach {x y w h} [NormalizeRectCoords $coo] break
set attr [list "x" $x "y" $y "width" $w "height" $h]
}
text {
set elem "text"
# ?
}
}
return $attr
}
# can2svg::MakeArcPath --
#
# Makes a path using A commands from an arc.
# Conversion from center to endpoint parameterization.
# From: http://www.w3.org/TR/2003/REC-SVG11-20030114
proc can2svg::MakeArcPath {coo opts} {
variable anglesToRadians
variable pi
# Canvas defaults.
array set optA {
-extent 90
-start 0
-style pieslice
}
array set optA $opts
# Extract center and radius from bounding box.
foreach {x1 y1 x2 y2} $coo break
set cx [expr ($x1 + $x2)/2.0]
set cy [expr ($y1 + $y2)/2.0]
set rx [expr abs($x1 - $x2)/2.0]
set ry [expr abs($y1 - $y2)/2.0]
set start [expr $anglesToRadians * $optA(-start)]
set extent [expr $anglesToRadians * $optA(-extent)]
# NOTE: direction of angles are opposite for Tk and SVG!
set theta1 [expr -1*$start]
set delta [expr -1*$extent]
set theta2 [expr $theta1 + $delta]
set phi 0.0
# F.6.4 Conversion from center to endpoint parameterization.
set x1 [expr $cx + $rx * cos($theta1) * cos($phi) - \
$ry * sin($theta1) * sin($phi)]
set y1 [expr $cy + $rx * cos($theta1) * sin($phi) + \
$ry * sin($theta1) * cos($phi)]
set x2 [expr $cx + $rx * cos($theta2) * cos($phi) - \
$ry * sin($theta2) * sin($phi)]
set y2 [expr $cy + $rx * cos($theta2) * sin($phi) + \
$ry * sin($theta2) * cos($phi)]
set fa [expr {abs($delta) > $pi} ? 1 : 0]
set fs [expr {$delta > 0.0} ? 1 : 0]
set data [format "M %.1f %.1f A" $x1 $y1]
append data [format " %.1f %.1f %.1f %1d %1d %.1f %.1f" \
$rx $ry $phi $fa $fs $x2 $y2]
switch -- $optA(-style) {
arc {
# empty.
}
chord {
append data " Z"
}
pieslice {
append data [format " L %.1f %.1f Z" $cx $cy]
}
}
return $data
}
# can2svg::MakeArcPathNonA --
#
# Makes a path without any A commands from an arc.
proc can2svg::MakeArcPathNonA {coo opts} {
variable anglesToRadians
array set optA $opts
foreach {x1 y1 x2 y2} $coo break
set cx [expr ($x1 + $x2)/2.0]
set cy [expr ($y1 + $y2)/2.0]
set rx [expr abs($x1 - $x2)/2.0]
set ry [expr abs($y1 - $y2)/2.0]
set rmin [expr $rx > $ry ? $ry : $rx]
# This approximation gives a maximum half pixel error.
set deltaPhi [expr 2.0/sqrt($rmin)]
set extent [expr $anglesToRadians * $optA(-extent)]
set start [expr $anglesToRadians * $optA(-start)]
set nsteps [expr int(abs($extent)/$deltaPhi) + 2]
set delta [expr $extent/$nsteps]
set data [format "M %.1f %.1f L" \
[expr $cx + $rx*cos($start)] [expr $cy - $ry*sin($start)]]
for {set i 0} {$i <= $nsteps} {incr i} {
set phi [expr $start + $i * $delta]
append data [format " %.1f %.1f" \
[expr $cx + $rx*cos($phi)] [expr $cy - $ry*sin($phi)]]
}
if {[info exists optA(-style)]} {
switch -- $optA(-style) {
chord {
append data " Z"
}
pieslice {
append data [format " %.1f %.1f Z" $cx $cy]
}
}
} else {
# Pieslice is the default.
append data [format " %.1f %.1f Z" $cx $cy]
}
return $data
}
# can2svg::MakeAttrList --
#
# Handles the use of style attributes or presenetation attributes.
proc can2svg::MakeAttrList {type opts usestyleattribute} {
if {$usestyleattribute} {
set attrList [list style [MakeStyleAttr $type $opts]]
} else {
set attrList [MakeStyleList $type $opts]
}
return $attrList
}
# can2svg::MakeStyleAttr --
#
# Produce the SVG style attribute from the canvas item options.
#
# Arguments:
# type tk canvas widget item type
# opts
#
# Results:
# The SVG style attribute as a a string.
proc can2svg::MakeStyleAttr {type opts} {
set style ""
foreach {key value} [MakeStyleList $type $opts] {
append style "${key}: ${value}; "
}
return [string trim $style]
}
proc can2svg::MakeStyleList {type opts args} {
array set argsA {
-setdefaults 1
}
array set argsA $args
# Defaults for everything except text.
if {$argsA(-setdefaults) && ![string equal $type "text"]} {
array set styleArr {fill none stroke black}
}
set fillCol black
foreach {key value} $opts {
switch -- $key {
-arrow {
set arrowValue $value
}
-arrowshape {
set arrowShape $value
}
-capstyle {
if {[string equal $value "projecting"]} {
set value "square"
}
if {![string equal $value "butt"]} {
set styleArr(stroke-linecap) $value
}
}
-dash {
set dashValue $value
}
-dashoffset {
if {$value != 0} {
set styleArr(stroke-dashoffset) $value
}
}
-extent {
# empty
}
-fill {
# Need to translate names to hex spec.
if {![regexp {#[0-9]+} $value]} {
set value [FormatColorName $value]
}
set fillCol $value
if {[string equal $type "line"]} {
set styleArr(stroke) [MapEmptyToNone $value]
} else {
set styleArr(fill) [MapEmptyToNone $value]
}
}
-font {
array set styleArr [MakeFontStyleList $value]
}
-joinstyle {
set styleArr(stroke-linejoin) $value
}
-outline {
set styleArr(stroke) [MapEmptyToNone $value]
}
-outlinestipple {
set outlineStippleValue $value
}
-start {
# empty
}
-stipple {
set stippleValue $value
}
-width {
set styleArr(stroke-width) $value
}
}
}
# If any arrow specify its marker def url key.
if {[info exists arrowValue]} {
if {[info exists arrowShape]} {
foreach {a b c} $arrowShape break
set arrowIdKey "arrowMarkerDef_${fillCol}_${a}_${b}_${c}"
set arrowIdKeyLast "arrowMarkerLastDef_${fillCol}_${a}_${b}_${c}"
} else {
set arrowIdKey "arrowMarkerDef_${fillCol}"
set arrowIdKeyLast $arrowIdKey
}
switch -- $arrowValue {
first {
set styleArr(marker-start) "url(#$arrowIdKey)"
}
last {
set styleArr(marker-end) "url(#$arrowIdKeyLast)"
}
both {
set styleArr(marker-start) "url(#$arrowIdKey)"
set styleArr(marker-end) "url(#$arrowIdKeyLast)"
}
}
}
if {[info exists stippleValue]} {
# Overwrite any existing.
set styleArr(fill) "url(#tile[string trimleft $stippleValue @])"
}
if {[info exists outlineStippleValue]} {
# Overwrite any existing.
set styleArr(stroke) "url(#tile[string trimleft $stippleValue @])"
}
# Transform dash value.
if {[info exists dashValue]} {
# Two different syntax here.
if {[regexp {[\.,\-_]} $dashValue]} {
# .=2 ,=4 -=6 space=4 times stroke width.
# A space enlarges the... space.
# Not foolproof!
regsub -all -- {[^ ]} $dashValue "& " dash
regsub -all -- " " $dash "12 " dash
regsub -all -- " " $dash "8 " dash
regsub -all -- " " $dash "4 " dash
regsub -all -- {\.} $dash "2 " dash
regsub -all -- {,} $dash "4 " dash
regsub -all -- {-} $dash "6 " dash
# Multiply with stroke width if > 1.
if {[info exists styleArr(stroke-width)] && \
($styleArr(stroke-width) > 1)} {
set width $styleArr(stroke-width)
set dashOrig $dash
set dash {}
foreach num $dashOrig {
lappend dash [expr int($width * $num)]
}
}
set styleArr(stroke-dasharray) [string trim $dash]
} else {
set dashValue [string trim $dashValue]
if {$dashValue ne ""} {
set styleArr(stroke-dasharray) $dashValue
}
}
}
if {[string equal $type "polygon"]} {
set styleArr(fill-rule) "evenodd"
}
return [array get styleArr]
}
proc can2svg::FormatColorName {value} {
if {[string length $value] == 0} {
return $value
}
switch -- $value {
black - white - red - green - blue {
set col $value
}
default {
# winfo rgb . white -> 65535 65535 65535
foreach rgb [winfo rgb . $value] {
lappend rgbx [expr $rgb >> 8]
}
set col [eval {format "#%02x%02x%02x"} $rgbx]
}
}
return $col
}
# can2svg::MakeFontStyleList --
#
# Takes a tk font description and returns a flat style array.
#
# Arguments:
# fontDesc a tk font description
#
# Results:
# flat style array
proc can2svg::MakeFontStyleList {fontDesc} {
# MICK Modify - break a named font into its component fields
set font [lindex $fontDesc 0]
if {[lsearch -exact [font names] $font] > -1} {
# This is a font name
set styleArr(font-family) [font config $font -family]
set fsize [font config $font -size]
if {$fsize > 0} {
# points
set funit pt
} else {
# pixels (actually user units)
set funit px
}
set styleArr(font-size) "[expr abs($fsize)]$funit"
if {[font config $font -slant] == "italic"} {
set styleArr(font-style) italic
}
if {[font config $font -weight] == "bold"} {
set styleArr(font-weight) bold
}
if {[font config $font -underline]} {
set styleArr(text-decoration) underline
}
if {[font config $font -overstrike]} {
set styleArr(text-decoration) overline
}
} else {
set styleArr(font-family) [lindex $fontDesc 0]
if {[llength $fontDesc] > 1} {
# Mick: added pt at end
set fsize [lindex $fontDesc 1]
if {$fsize > 0} {
# points
set funit pt
} else {
# pixels (actually user units)
set funit px
}
set styleArr(font-size) "[expr abs($fsize)]$funit"
}
if {[llength $fontDesc] > 2} {
set tkstyle [lindex $fontDesc 2]
switch -- $tkstyle {
bold {
set styleArr(font-weight) $tkstyle
}
italic {
set styleArr(font-style) $tkstyle
}
underline {
set styleArr(text-decoration) underline
}
overstrike {
set styleArr(text-decoration) overline
}
}
}
}
return [array get styleArr]
}
# can2svg::SplitWrappedLines --
#
# MICK O'DONNELL: added code to split wrapped lines
# This is actally only needed for text items with -width != 0.
# If -width = 0 then just return it.
proc can2svg::SplitWrappedLines {line font wgtWidth} {
# If the text is shorter than the widget width, no need to wrap
# If the wgtWidth comes out as 0, don't wrap
if {$wgtWidth == 0 || [font measure $font $line] <= $wgtWidth} {
return [list $line]
}
# Wrap the line
set width 0
set endchar 0
while {$width < $wgtWidth} {
set substr [string range $line 0 [incr endchar]]
set width [font measure $font $substr]
}
# Go back till we find a nonwhite char
set char [string index $line $endchar]
set default [expr $endchar -1]
while {[BreakChar $char] == 0} {
if {$endchar == 0} {
# we got to the front without breaking, so break midword
set endchar $default
break
}
set char [string index $line [incr endchar -1]]
}
set first [string range $line 0 $endchar]
set rest [string range $line [expr $endchar+1] end]
return [concat [list $first] [SplitWrappedLines $rest $font $wgtWidth]]
}
proc can2svg::BreakChar {char} {
if [string is space $char] {return 1}
if {$char == "-"} {return 1}
if {$char == ","} {return 1}
return 0
}
# can2svg::MakeImageAttr --
#
# Special code is needed to make the attributes for an image item.
#
# Arguments:
# elem
#
# Results:
#
proc can2svg::MakeImageAttr {coo opts args} {
variable confopts
array set optA {-anchor nw}
array set optA $opts
array set argsA $args
set attrList [ImageCoordsToAttr $coo $opts]
# We should make this an URI.
set image $optA(-image)
set fileName [$image cget -file]
if {$fileName ne ""} {
if {[string equal $argsA(-uritype) "file"]} {
set uri [FileUriFromLocalFile $fileName]
} elseif {[string equal $argsA(-uritype) "http"]} {
set uri [HttpFromLocalFile $fileName]
}
lappend attrList "xlink:href" $uri
} else {
# Unclear if we can use base64 data in svg.
}
return $attrList
}
# Function � �: can2svg::ImageCoordsToAttr
# ------------------------------ ------------------------------ ---------
# Returns � � : list of x y width and height including description
# Parameters �: coo �- coordinates of the image
# � � � � � � � opts - argument list -anchor nw ...
#
# Description :
# fixme (Roger) 01/25/2008 :Why not using the bounding box?
#
# Written � � : 2002-2007, Mats
# Rewritten � : 01/25/2008, Roger
# ------------------------------ ------------------------------ ---------
proc can2svg::ImageCoordsToAttr {coo opts} {
array set optArr {-anchor nw}
array set optArr $opts
if {![info exists optArr(-image)]} {
return -code error "Missing -image option; can't parse that"
}
set theImage $optArr(-image)
lassign $coo x0 y0
set w [image width $theImage]
set h [image height $theImage]
set x [expr {$x0 - $w/2.0}]
set y [expr {$y0 - $h/2.0}]
if { "center" ne $optArr(-anchor) } {
foreach orientation [split $optArr(-anchor) {}] {
switch $orientation {
n { set y $y0 }
s { set y [expr {$y0 - $w}] }
e { set x [expr {$x0 - $h}] }
w { set x $x0 }
default {}
}
}
}
return [list "x" $x "y" $y "width" $w "height" $h]
}
proc can2svg::ImageCoordsToAttrBU {coo opts} {
array set optA {-anchor nw}
array set optA $opts
if {[info exists optA(-image)]} {
set theImage $optA(-image)
set w [image width $theImage]
set h [image height $theImage]
} else {
return -code error "Missing -image option; can't parse that"
}
foreach {x0 y0} $coo break
switch -- $optA(-anchor) {
nw {
set x $x0
set y $y0
}
n {
set x [expr $x0 - $w/2.0]
set y $y0
}
ne {
set x [expr $x0 - $w]
set y $y0
}
e {
set x $x0
set y [expr $y0 - $h/2.0]
}
se {
set x [expr $x0 - $w]
set y [expr $y0 - $h]
}
s {
set x [expr $x0 - $w/2.0]
set y [expr $y0 - $h]
}
sw {
set x $x0
set y [expr $y0 - $h]
}
w {
set x $x0
set y [expr $y0 - $h/2.0]
}
center {
set x [expr $x0 - $w/2.0]
set y [expr $y0 - $h/2.0]
}
}
set attrList [list "x" $x "y" $y "width" $w "height" $h]
return $attrList
}
# can2svg::GetTextSVGCoords --
#
# Figure out the baseline coords of the svg text element from
# the canvas text item.
#
# Arguments:
# coo {x y}
# anchor
# chdata character data, newlines included.
#
# Results:
# raw xml data of the marker def element.
proc can2svg::GetTextSVGCoords {coo anchor chdata theFont nlines} {
foreach {x y} $coo break
set ascent [font metrics $theFont -ascent]
set lineSpace [font metrics $theFont -linespace]
# If not anchored to the west it gets more complicated.
if {![string match $anchor "*w*"]} {
# Need to figure out the extent of the text.
if {$nlines <= 1} {
set textWidth [font measure $theFont $chdata]
} else {
set textWidth 0
foreach line [split $chdata "\n"] {
set lineWidth [font measure $theFont $line]
if {$lineWidth > $textWidth} {
set textWidth $lineWidth
}
}
}
}
switch -- $anchor {
nw {
set xbase $x
set ybase [expr $y + $ascent]
}
w {
set xbase $x
set ybase [expr $y - $nlines*$lineSpace/2.0 + $ascent]
}
sw {
set xbase $x
set ybase [expr $y - $nlines*$lineSpace + $ascent]
}
s {
set xbase [expr $x - $textWidth/2.0]
set ybase [expr $y - $nlines*$lineSpace + $ascent]
}
se {
set xbase [expr $x - $textWidth]
set ybase [expr $y - $nlines*$lineSpace + $ascent]
}
e {
set xbase [expr $x - $textWidth]
set ybase [expr $y - $nlines*$lineSpace/2.0 + $ascent]
}
ne {
set xbase [expr $x - $textWidth]
set ybase [expr $y + $ascent]
}
n {
set xbase [expr $x - $textWidth/2.0]
set ybase [expr $y + $ascent]
}
center {
set xbase [expr $x - $textWidth/2.0]
set ybase [expr $y - $nlines*$lineSpace/2.0 + $ascent]
}
}
return [list $xbase $ybase]
}
# can2svg::ParseSplineToPath --
#
# Make the path data string for a bezier.
#
# Arguments:
# type canvas type: line or polygon
# coo its coordinate list
#
# Results:
# path data string
proc can2svg::ParseSplineToPath {type coo} {
set npts [expr [llength $coo]/2]
# line is open ended while the polygon must be closed.
# Need to construct a closed smooth polygon with path instructions.
switch -- $npts {
1 {
set data "M [lrange $coo 0 1]"
}
2 {
set data "M [lrange $coo 0 1] L [lrange $coo 2 3]"
}
3 {
set data "M [lrange $coo 0 1] Q [lrange $coo 2 5]"
}
default {
if {[string equal $type "polygon"]} {
set x0s [expr ([lindex $coo 0] + [lindex $coo end-1])/2.]
set y0s [expr ([lindex $coo 1] + [lindex $coo end])/2.]
set data "M $x0s $y0s"
# Add Q1 and Q2 points.
append data " Q [lrange $coo 0 1]"
set x0 [expr ([lindex $coo 0] + [lindex $coo 2])/2.]
set y0 [expr ([lindex $coo 1] + [lindex $coo 3])/2.]
append data " $x0 $y0"
set xctrlp [lindex $coo 2]
set yctrlp [lindex $coo 3]
set tind 4
} else {
set data "M [lrange $coo 0 1]"
# Add Q1 and Q2 points.
append data " Q [lrange $coo 2 3]"
set x0 [expr ([lindex $coo 2] + [lindex $coo 4])/2.]
set y0 [expr ([lindex $coo 3] + [lindex $coo 5])/2.]
append data " $x0 $y0"
set xctrlp [lindex $coo 4]
set yctrlp [lindex $coo 5]
set tind 6
}
append data " T"
foreach {x y} [lrange $coo $tind end-2] {
#puts "x=$x, y=$y, xctrlp=$xctrlp, yctrlp=$yctrlp"
# The T point is the midpoint between the
# two control points.
set x0 [expr ($x + $xctrlp)/2.0]
set y0 [expr ($y + $yctrlp)/2.0]
set xctrlp $x
set yctrlp $y
append data " $x0 $y0"
#puts "data=$data"
}
if {[string equal $type "polygon"]} {
set x0 [expr ([lindex $coo end-1] + $xctrlp)/2.0]
set y0 [expr ([lindex $coo end] + $yctrlp)/2.0]
append data " $x0 $y0"
append data " $x0s $y0s"
} else {
append data " [lrange $coo end-1 end]"
}
#puts "data=$data"
}
}
return $data
}
# can2svg::MakeArrowMarker --
#
# Make the xml for an arrow marker def element.
#
# Arguments:
# a arrows length along its symmetry line
# b arrows total length
# c arrows half width
# col its color
#
# Results:
# a list of xmllists of the marker def elements, both start and last.
proc can2svg::MakeArrowMarker {a b c col} {
variable formatArrowMarker
variable formatArrowMarkerLast
unset -nocomplain formatArrowMarker
if {![info exists formatArrowMarker]} {
# "M 0 c, b 0, a c, b 2*c Z" for the start marker.
# "M 0 0, b c, 0 2*c, b-a c Z" for the last marker.
set data "M 0 %s, %s 0, %s %s, %s %s Z"
set style "fill: %s; stroke: %s;"
set attr [list "d" $data "style" $style]
set arrowList [MakeXMLList "path" -attrlist $attr]
set markerAttr [list "id" %s "markerWidth" %s "markerHeight" %s \
"refX" %s "refY" %s "orient" "auto"]
set defElemList [MakeXMLList "defs" -subtags \
[list [MakeXMLList "marker" -attrlist $markerAttr \
-subtags [list $arrowList] ] ] ]
set formatArrowMarker $defElemList
# ...and the last arrow marker.
set dataLast "M 0 0, %s %s, 0 %s, %s %s Z"
set attrLast [list "d" $dataLast "style" $style]
set arrowLastList [MakeXMLList "path" -attrlist $attrLast]
set defElemLastList [MakeXMLList "defs" -subtags \
[list [MakeXMLList "marker" -attrlist $markerAttr \
-subtags [list $arrowLastList] ] ] ]
set formatArrowMarkerLast $defElemLastList
}
set idKey "arrowMarkerDef_${col}_${a}_${b}_${c}"
set idKeyLast "arrowMarkerLastDef_${col}_${a}_${b}_${c}"
# Figure out the order of all %s substitutions.
set markerXML [format $formatArrowMarker $idKey \
$b [expr 2*$c] 0 $c \
$c $b $a $c $b [expr 2*$c] $col $col]
set markerLastXML [format $formatArrowMarkerLast $idKeyLast \
$b [expr 2*$c] $b $c \
$b $c [expr 2*$c] [expr $b-$a] $c $col $col]
return [list $markerXML $markerLastXML]
}
# can2svg::MakeGrayStippleDef --
#
#
proc can2svg::MakeGrayStippleDef {stipple} {
variable stippleDataArr
set pathList [MakeXMLList "path" -attrlist \
[list "d" $stippleDataArr($stipple) "style" "stroke: black; fill: none;"]]
set patterAttr [list "id" "tile$stipple" "x" 0 "y" 0 "width" 4 "height" 4 \
"patternUnits" "userSpaceOnUse"]
set defElemList [MakeXMLList "defs" -subtags \
[list [MakeXMLList "pattern" -attrlist $patterAttr \
-subtags [list $pathList] ] ] ]
return $defElemList
}
# can2svg::MapEmptyToNone --
#
#
# Arguments:
# elem
#
# Results:
#
proc can2svg::MapEmptyToNone {val} {
if {[string length $val] == 0} {
return "none"
} else {
return $val
}
}
# can2svg::NormalizeRectCoords --
#
#
# Arguments:
# elem
#
# Results:
#
proc can2svg::NormalizeRectCoords {coo} {
foreach {x1 y1 x2 y2} $coo {}
return [list [expr $x2 > $x1 ? $x1 : $x2] \
[expr $y2 > $y1 ? $y1 : $y2] \
[expr abs($x1-$x2)] \
[expr abs($y1-$y2)]]
}
# can2svg::makedocument --
#
# Adds the prefix and suffix elements to make a complete XML/SVG
# document.
#
# Arguments:
# elem
#
# Results:
#
proc can2svg::makedocument {width height xml} {
set pre "<?xml version='1.0'?>\n\
<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\
\"Graphics/SVG/1.1/DTD/svg11.dtd\">"
set svgStart "<svg width='$width' height='$height' version='1.1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'>"
set svgEnd "</svg>"
return "${pre}\n${svgStart}\n${xml}${svgEnd}"
}
# can2svg::canvas2file --
#
# Takes everything on a canvas widget, translates it to XML/SVG,
# and puts it on a file.
#
# Arguments:
# wcan the canvas widget path
# path the file path
# args: -height
# -width
#
# Results:
#
proc can2svg::canvas2file {wcan path args} {
variable confopts
variable defsArrowMarkerArr
variable defsStipplePatternArr
array set argsA [array get confopts]
foreach {x y width height} [$wcan cget -scrollregion] break
array set argsA [list -width $width -height $height]
array set argsA $args
set args [array get argsA]
# Need to make a fresh start for marker def's.
unset -nocomplain defsArrowMarkerArr defsStipplePatternArr
set fd [open $path w]
# This could have been done line by line.
set xml ""
foreach id [$wcan find all] {
set type [$wcan type $id]
set opts [$wcan itemconfigure $id]
set opcmd {}
foreach opt $opts {
set op [lindex $opt 0]
set val [lindex $opt 4]
# Empty val's except -fill can be stripped off.
if {![string equal $op "-fill"] && ([string length $val] == 0)} {
continue
}
lappend opcmd $op $val
}
set co [$wcan coords $id]
set cmd [concat "create" $type $co $opcmd]
append xml "\t[eval {can2svg $cmd} $args]\n"
}
puts $fd [makedocument $argsA(-width) $argsA(-height) $xml]
close $fd
}
# can2svg::MakeXML --
#
# Creates raw xml data from a hierarchical list of xml code.
# This proc gets called recursively for each child.
# It makes also internal entity replacements on character data.
# Mixed elements aren't treated correctly generally.
#
# Arguments:
# xmlList a list of xml code in the format described in the header.
#
# Results:
# raw xml data.
proc can2svg::MakeXML {xmlList} {
# Extract the XML data items.
foreach {tag attrlist isempty chdata childlist} $xmlList {}
set rawxml "<$tag"
foreach {attr value} $attrlist {
append rawxml " ${attr}='${value}'"
}
if {$isempty} {
append rawxml "/>"
return $rawxml
} else {
append rawxml ">"
}
# Call ourselves recursively for each child element.
# There is an arbitrary choice here where childs are put before PCDATA.
foreach child $childlist {
append rawxml [MakeXML $child]
}
# Make standard entity replacements.
if {[string length $chdata]} {
append rawxml [XMLCrypt $chdata]
}
append rawxml "</$tag>"
return $rawxml
}
# can2svg::MakeXMLList --
#
# Build an element list given the tag and the args.
#
# Arguments:
# tagname: the name of this element.
# args:
# -empty 0|1 Is this an empty tag? If $chdata
# and $subtags are empty, then whether
# to make the tag empty or not is decided
# here. (default: 1)
# -attrlist {attr1 value1 attr2 value2 ..} Vars is a list
# consisting of attr/value pairs, as shown.
# -chdata $chdata ChData of tag (default: "").
# -subtags {$subchilds $subchilds ...} is a list containing xmldata
# of $tagname's subtags. (default: no sub-tags)
#
# Results:
# a list suitable for can2svg::MakeXML.
proc can2svg::MakeXMLList {tagname args} {
# Fill in the defaults.
array set xmlarr {-isempty 1 -attrlist {} -chdata {} -subtags {}}
# Override the defults with actual values.
if {[llength $args] > 0} {
array set xmlarr $args
}
if {!(($xmlarr(-chdata) eq "") && ($xmlarr(-subtags) eq ""))} {
set xmlarr(-isempty) 0
}
# Build sub elements list.
set sublist [list]
foreach child $xmlarr(-subtags) {
lappend sublist $child
}
set xmlList [list $tagname $xmlarr(-attrlist) $xmlarr(-isempty) \
$xmlarr(-chdata) $sublist]
return $xmlList
}
# can2svg::XMLCrypt --
#
# Makes standard XML entity replacements.
#
# Arguments:
# chdata: character data.
#
# Results:
# chdata with XML standard entities replaced.
proc can2svg::XMLCrypt {chdata} {
foreach from {\& < > {"} {'}} \
to {{\&} {\<} {\>} {\"} {\'}} {
regsub -all $from $chdata $to chdata
}
return $chdata
}
# can2svg::FileUriFromLocalFile --
#
# Not foolproof!
proc can2svg::FileUriFromLocalFile {path} {
# Quote the disallowed characters according to the RFC for URN scheme.
# ref: RFC2141 sec2.2
return file://[uriencode::quotepath $path]
}
# can2svg::HttpFromLocalFile --
#
# Translates an absolute file path to an uri encoded http address.
proc can2svg::HttpFromLocalFile {path} {
variable confopts
set relPath [::tfileutils::relative $confopts(-httpbasedir) $path]
set relPath [uriencode::quotepath $relPath]
return "http://$confopts(-httpaddr)/$relPath"
}
#-------------------------------------------------------------------------------
