Draw2SVG Converter

draw2svg is a RISC OS command to convert RISC OS Draw files to Scalable Vector Graphics (SVGs).

This is a RISC OS program for converting RISC OS Drawfiles to Scalable Vector Graphics (SVG) files. It should be 32-bit ready.

Contact Steven Simpson for discussion of this program. For further updates, see the website.

Installation from RISC OS binary

Copy the supplied !Boot directory over your own !Boot. It adds a file to !Boot.Library so that you can use draw2svg at the command line.

Files

• !Boot
  • Library
    • draw2svg — command-line program
• Draw2SVG
  • Docs
    • LICENSE — GNU GPL
    • HISTORY — Bug fixes and stuff
    • VERSION — Version number
  • Source
    • draw2svg/c — old C source code
    • c.*, h.* — new C source code
  • Extras
    • draw2svg — Configuration for !ComndCTRL
    • Sprites — Dodgy low-res sprites for SVG type
  • Tests — Some tests

Only the !Boot.Library.draw2svg binary is functionally necessary.

File type

You might wish to add these to your boot sequence:

Set File$Type_AAD SVG
DOSMap SVG SVG

Source dependencies

The code is known to compile with GCCSDK. CSWIs is required to provide the symbolic SWI names. lynx and markdown commands are required to build the plain-text version of this documentation.

Installation from source

The source is meant to be cross-compiled from Linux, using GCCSDK, for example. It ultimately builds a ZIP which contains the directory structure for installation on RISC OS.

The makefile attempts to read from config.mk in the same directory, then from draw2svg-env.mk in the search path (which can be set with -I on the command line, or by setting the environment variable MAKEFLAGS). If you have GCCSDK installed in ~/.local/opt/gccsdk, and the dependencies compiled and installed in ~/.local/opt/riscos-devel, you could put this in config.mk:

RISCOS_PREFIX=$(HOME)/.local/opt/riscos-devel
GCCSDK=$(HOME)/.local/opt/gccsdk

CPPFLAGS += -static
APPTYPE=ff8
APPTYPE=e1f

APPCP=$(GCCSDK)/cross/arm-unknown-riscos/bin/elf2aif
ELF2AIF=$(APPCP)
CMHG=$(GCCSDK)/cross/bin/cmunge
CC=$(GCCSDK)/cross/bin/arm-unknown-riscos-gcc
CXX=$(GCCSDK)/cross/bin/arm-unknown-riscos-g++
AR=$(GCCSDK)/cross/bin/arm-unknown-riscos-ar
AS=$(GCCSDK)/cross/bin/arm-unknown-riscos-as
RANLIB=$(GCCSDK)/cross/bin/arm-unknown-riscos-ranlib

ARCHIVE_DIR=$(RISCOS_PREFIX)/export
RISCOS_ZIP=$(GCCSDK)/env/bin/zip -,
UNZIP=$(GCCSDK)/env/bin/unzip

PREFIX=$(RISCOS_PREFIX)
LDFLAGS += -L$(RISCOS_PREFIX)/lib
CPPFLAGS += -I$(RISCOS_PREFIX)/include

Then you can compile with:

make

This builds out/draw2svg-riscos.zip, which can be unpacked on RISC OS for installation.

If you do this:

make install

It will install the files directly in $(PREFIX)/apps. You can use this to make the program directly available to an emulator or physical machine that can access that directory.

Usage

Either use the command line:

draw2svg [options] <infile> <outfile>

or use the !ComndCTRL configuration file Draw2SVG.Extras.draw2svg for a WIMP front-end.

Options include:

• --help of -h – Display options.

• --thin <width><units> – Set width of thin, non-transparent lines. The default is one draw unit.

• --units <units> or -u <units> – Set units for output. in is the default.

• -/+xy – Enable/disable x and y attributes for top-level <svg> element. Disabled by default.

• -/+g – Enable/disable translation of Drawfile groups into <g> elements. Enabled by default.

• -z Set absolute sizing. width and height attributes are included on the root <svg> element using the preferred units (-u).

• +z – Disable sizing. width and height attributes are omitted from the root <svg> element.

• --pcsize – Set percentage sizing. width and height attributes are included on the root <svg> element expressed as percentages. The longer dimension will be 100%, and width:height expresses the aspect ratio. This is the default.

• -/+it – Enable/disable check input for Drawfile type (hex AFF, Drawfile). Enabled by default.

• -/+ot – Enable/disable setting of output type (hex AAD, SVG). Enabled by default.

• -bg #rrggbb or +bg – Set/cancel background colour. Cancelled by default.

• --scale x[,y] or --fit *|width,*|height or --no-fit|--no-scale|--fit *,* – Set scale factors or fit to width/height/both, or reset. 1,1 by default.

• --margin width[,height] or --no-margin – Set/cancel margin.

<units> are pt (points), in (inches), mm (millimetres), or cm (centimetres).

Scaling is performed first, then the margin is added, then the background is added.

Features

Converts:

• path objects to SVG paths (with caps)
• text objects to SVG paths
• sprite objects to SVG rectangles
  • just replace <rect style="fill: #777" with <image xlink:href="your image URI"

To do

• Convert text area objects.

• Use <foreignObject> to represent multiline text areas.

• Apply the kerning property according to settingsm in the Drawfile. Set to auto for 'on' and 0 for 'off'.

• Set textLength attribute to actual length of the text object.

• Extract sprite and JPEG objects, converting sprites to PNGs. Ideas for image handling:

  • For all images, keep track of identical images in the same document that have already been converted. Declare or identify the first, and make evrything else a <use>.

  • For small images, compute the data: URI.

  • Try converting indexed images with few colours, and preferably only two alpha levels, to a path using the edges library.

  • Permit a configurable stack of index databases which map images to URIs. Use a hash table to search quickly.

  • Convert remaining images, and place in a subdirectory.