###############################################################################
#                                                                             #
#  Lout @Pie package for drawing pie charts                                   #
#  Version 1.0 (October 2002)                                                 #
#  Jeffrey H. Kingston                                                        #
#                                                                             #
#  This program is free software; you can redistribute it and/or modify       #
#  it under the terms of the GNU General Public License as published by       #
#  the Free Software Foundation; either Version 3, or (at your option)        #
#  any later version.                                                         #
#                                                                             #
#  This program is distributed in the hope that it will be useful,            #
#  but WITHOUT ANY WARRANTY; without even the implied warranty of             #
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              #
#  GNU General Public License for more details.                               #
#                                                                             #
#  You should have received a copy of the GNU General Public License          #
#  along with this program; if not, write to the Free Software                #
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA     #
#                                                                             #
#  As a special exception, when this file is read by Lout when processing     #
#  a Lout source document, you may use the result without restriction.        #
#                                                                             #
###############################################################################

@SysPrependGraphic { pief.lpg }
@SysInclude { lengths }			# @PSLengths and @LoutLengths
@SysInclude { coltex }			# @ColourCommand and @TextureCommand


###############################################################################
#                                                                             #
#  @PieSetup symbol                                                           #
#                                                                             #
###############################################################################

export @Pie
def @PieSetup
    named save		             	{ no	           	}
    named totalweight			{ 100			}
    named radius			{ 2.5c			}
    import @PSLengths named initialangle{ 0d			}
    named leftextra		       	{ 0i	           	}
    named rightextra		       	{ 0i	           	}
    named aboveextra		       	{ 0i	           	}
    named belowextra		       	{ 0i	           	}
    named leftcaption		       	{ 	           	}
    named rightcaption		       	{ 	           	}
    named abovecaption		       	{ 	           	}
    named belowcaption		       	{ 	           	}
    named leftgap			{ 0.5c	           	}
    named rightgap			{ 0.5c	           	}
    named abovegap			{ 0.5c	           	}
    named belowgap			{ 0.5c	           	}
    named hidecaptions		       	{ yes	           	}
    named weight			{ 1			}
    named paint                 	{ none		       	}
    import @TextureImport named texture	{ solid		       	}
    named outlinestyle
	named solid   { "/lpiesolid"   }
	named dashed  { "/lpiedashed"  }
	named cdashed { "/lpiecdashed" }
	named dotted  { "/lpiedotted"  }
	named noline  { "/lpienoline"  }
					{ solid         	}
    import @PSLengths named outlinedashlength	{ 0.2f		}
    import @PSLengths named outlinewidth
	named thin   { 0.04f }
	named medium { 0.08f }
	named thick  { 0.12f }
					{ thin	         	}
    named detach
	named yes Yes	{ 0.5	}
	named no No	{ 0.0	}
					{ no			}
    named label				{			}
    named labelfont			{ -2p			}
    named labelbreak			{ clines		}
    named labelmargin			{ 0.2f          	}
    named labelformat right @Body    	{ @Body         	}
    named labelradius
	named internal { 0.6 }
        named external { 1.4 }
					{ internal		}
    import @PSLengths named labeladjust	{ 0 0			}
    named finger			{ no			}
    named fingerstyle
	named solid   { "/lpiesolid"   }
	named dashed  { "/lpiedashed"  }
	named cdashed { "/lpiecdashed" }
	named dotted  { "/lpiedotted"  }
	named noline  { "/lpienoline"  }
					{ solid         	}
    import @PSLengths named fingerdashlength { 0.2f		}
    import @PSLengths named fingerwidth
	named thin   { 0.04f }
	named medium { 0.08f }
	named thick  { 0.12f }
					{ thin	         	}
    named fingerradius			{ 0.7			}
    import @PSLengths named fingeradjust{ 0 0			}
    named fingerarrow			{ no			}
    import @PSLengths named fingerarrowlength	{ 0.6f		}
    import @PSLengths named fingerarrowwidth	{ 0.45f		}
{

    ###########################################################################
    #                                                                         #
    #  @Pie symbol                                                            #
    #                                                                         #
    ###########################################################################

    export @Slice
    def @Pie
        named save		             	{ save	           	}
	named totalweight			{ 100			}
        named radius				{ radius		}
        import @PSLengths named initialangle	{ initialangle		}
	named leftextra			       	{ leftextra		}
	named rightextra		       	{ rightextra		}
	named aboveextra		       	{ aboveextra		}
	named belowextra		       	{ belowextra		}
	named leftcaption		       	{ leftcaption		}
	named rightcaption		       	{ rightcaption		}
	named abovecaption		       	{ abovecaption		}
	named belowcaption		       	{ belowcaption		}
	named leftgap				{ leftgap           	}
	named rightgap				{ rightgap           	}
	named abovegap				{ abovegap           	}
	named belowgap				{ belowgap           	}
	named hidecaptions		       	{ hidecaptions		}
        named weight				{ weight		}
        named paint                 		{ paint 	      	}
	import @TextureImport named texture	{ texture	       	}
        named outlinestyle
	    named solid   { "/lpiesolid"   }
	    named dashed  { "/lpiedashed"  }
	    named cdashed { "/lpiecdashed" }
	    named dotted  { "/lpiedotted"  }
	    named noline  { "/lpienoline"  }
						{ outlinestyle         	}
        import @PSLengths named outlinedashlength{ outlinedashlength	}
        import @PSLengths named outlinewidth
	    named thin   { 0.04f }
	    named medium { 0.08f }
	    named thick  { 0.12f }
						{ outlinewidth         	}
        named detach
	    named yes Yes	{ 0.5	}
	    named no No		{ 0.0	}
						{ detach		}
        named label				{ label          	}
        named labelfont				{ labelfont		}
        named labelbreak			{ labelbreak		}
        named labelmargin			{ labelmargin          	}
        named labelformat right @Body  		{ labelformat @Body    	}
        named labelradius
	    named internal { 0.6 }
            named external { 1.4 }
						{ labelradius		}
        import @PSLengths named labeladjust	{ labeladjust		}
        named finger				{ finger		}
        named fingerstyle
	    named solid   { "/lpiesolid"   }
	    named dashed  { "/lpiedashed"  }
	    named cdashed { "/lpiecdashed" }
	    named dotted  { "/lpiedotted"  }
	    named noline  { "/lpienoline"  }
						{ fingerstyle         	}
        import @PSLengths named fingerdashlength{ fingerdashlength	}
        import @PSLengths named fingerwidth
	    named thin   { 0.04f }
	    named medium { 0.08f }
	    named thick  { 0.12f }
						{ fingerwidth         	}
        named fingerradius			{ fingerradius		}
        import @PSLengths named fingeradjust	{ fingeradjust		}
	named fingerarrow			{ fingerarrow		}
	import @PSLengths named fingerarrowlength { fingerarrowlength	}
	import @PSLengths named fingerarrowwidth  { fingerarrowwidth	}

        body @Body
    {


	#######################################################################
	#                                                                     #
	#  Miscellaneous helper definitions                                   #
	#                                                                     #
	#######################################################################

        def @AddPaint left col right texture
	{
	  col @Case {
	    { "no" "none" "nopaint" } @Yield "{}"
	    else                 @Yield { "{" @ColourCommand col texture "fill }" }
	  }
	}

        # Like @Graphic, but affects the graphics state of right parameter
        def @InnerGraphic
            left ps
            right x
        {
            { ps gsave // grestore } @Graphic x
        }

        def @ZeroWidth right x
        {
	    @HContract @VContract {
            ^|0io @HContract @VContract x |0io
	    }
        }

        def @ZeroSize right x
        {
	    @HContract @VContract {
            ^/0io ^|0io @HContract @VContract x |0io /0io
	    }
        }


	#######################################################################
	#                                                                     #
	#  @Slice                                                             #
	#                                                                     #
	#######################################################################

        def @Slice
	    named weight			{ weight		}
	    named paint				{ paint			}
	    import @TextureImport named texture	{ texture	       	}
	    named outlinestyle
		named solid   { "/lpiesolid"   }
		named dashed  { "/lpiedashed"  }
		named cdashed { "/lpiecdashed" }
		named dotted  { "/lpiedotted"  }
		named noline  { "/lpienoline"  }
						{ outlinestyle		}
	    import @PSLengths named outlinedashlength { outlinedashlength }
	    import @PSLengths named outlinewidth
		named thin   { 0.04f }
		named medium { 0.08f }
		named thick  { 0.12f }
						{ outlinewidth		}
            named detach
	        named yes Yes	{ 0.5	}
	        named no No	{ 0.0	}
						{ detach		}
	    named label				{ label			}
            named labelfont			{ labelfont		}
            named labelbreak			{ labelbreak		}
            named labelmargin			{ labelmargin		}
            named labelformat right @Body	{ labelformat @Body	}
            named labelradius
	        named internal { 0.6 }
                named external { 1.4 }
						{ labelradius		}
            import @PSLengths named labeladjust	{ labeladjust		}
	    named finger			{ finger		}
            named fingerstyle
	        named solid   { "/lpiesolid"   }
	        named dashed  { "/lpiedashed"  }
	        named cdashed { "/lpiecdashed" }
	        named dotted  { "/lpiedotted"  }
	        named noline  { "/lpienoline"  }
						{ fingerstyle		}
            import @PSLengths named fingerdashlength { fingerdashlength }
            import @PSLengths named fingerwidth
	        named thin   { 0.04 ft }
	        named medium { 0.08 ft }
	        named thick  { 0.12 ft }
						{ fingerwidth		}
            named fingerradius			{ fingerradius		}
            import @PSLengths named fingeradjust{ fingeradjust		}
	    named fingerarrow			{ fingerarrow		}
	    import @PSLengths named fingerarrowlength { fingerarrowlength }
	    import @PSLengths named fingerarrowwidth { fingerarrowwidth	}
        {

	    def @DrawSlice
	    {
		outlinedashlength "[" outlinestyle "]"
		outlinewidth paint @AddPaint texture
		weight detach
	        "lpiebeginslice"
		//
		"lpieendslice"
	    }

	    def @TranslateLabelAndDrawFinger
	    {   labeladjust labelradius "lpietranslatelabel"
		finger @Case {
		    { no No } @Yield ""
		    { yes Yes } @Yield {
			fingerdashlength "[" fingerstyle "]"
			fingerwidth fingeradjust fingerradius
			"lpiedrawfinger"
			fingerarrow @Case {
			    { no No } @Yield ""
			    { yes Yes } @Yield {
				fingerarrowlength fingerarrowwidth
				"lpiedrawarrowhead"
			    }
			}
		    }
		}
	    }

	    def @AddMargins right x
	    {
		@HContract @VContract {
		    //labelmargin ||labelmargin x ||labelmargin //labelmargin
		}
	    }

	    @Null @ZeroSize @DrawSlice @Graphic
		@TranslateLabelAndDrawFinger @InnerGraphic {
	        @AddMargins labelfont @Font labelbreak @Break labelformat label
	    } @Null

	}

	def @Above
	{
	    abovecaption @Case {
		""   @Yield ""
	        else @Yield @OneCol {
		    ||0.5rt clines @Break abovecaption || //abovegap
	    	}
	    }
	}

	def @Below
	{
	    belowcaption @Case {
		""   @Yield ""
	        else @Yield @OneCol {
	    	    //belowgap ||0.5rt clines @Break belowcaption ||
		}
	    }
	}

	def @Left
	{
	    leftcaption @Case {
		""   @Yield ""
	        else @Yield @OneRow {
		    { //0.5rt clines @Break leftcaption // } ^||leftgap
		}
	    }
	}

	def @Right
	{
	    rightcaption @Case {
	    	"" @Yield ""
		else @Yield @OneRow {
		    ||rightgap { //0.5rt lines @Break rightcaption // }
		}
	    }
	}

	def @HideWidth right x
	{
	    hidecaptions @Case {
		{ No  no  } @Yield x
		{ Yes yes } @Yield @OneCol { ||0io x ||0io }
	    }
	}

	def @AddCaptions right x
	{

	    @HContract @VContract
	    {
	                           | @Above    |
	        / @HideWidth @Left | &0.5rt x  | @HideWidth @Right
	        /                  | @Below    |
	    }
	}

	def @AddExtra right x
	{
	    @HContract @VContract
	    {
		/aboveextra |leftextra x |rightextra /belowextra
	    }
	}

	def @GraphicSetup right x
	{
	    {
	    save @Case {
		{ yes Yes } @Yield {
		    "grestore save gsave" totalweight initialangle "lpiebegin"
		    //
		    "lpieend restore"
		}
		{ no No }   @Yield {
		    totalweight initialangle "lpiebegin"
		    //
		    "lpieend"
		}
	    }
	    } @Graphic x
	}

	def @Base right x
	{
	    def @Square { radius @Wide radius @High {} }

	    @HContract @VContract {
		@Square ^| @Square
		^/
		@Square  | @Square
		/
		x
	    }
	}

	@AddCaptions @AddExtra @GraphicSetup @Base @Body

    }
}