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Technical Tip
Rotate GRAPH x axis
Submitted by Keith Culotta, Computer Dimensions, Inc.

Sometimes the GRAPH command will produce a graph with an overcrowded x axis.  This routine takes the graph and rotates the x axis labels so they will not overlap.

Create the Graph and pass a pointer to it as the first parameter of the method.  The labels will be rotated 22.5 degrees unless another number is passed as the second parameter.

C_PICTURE(MyGraph)
GRAPH ( MyGraph ; graphNumber | graphSettings ; xLabels {; yElements} {; yElements2 ; ... ; yElementsN} )
Graph_Pic_RotateXLabels(->MyGraph {;rotate degree} )


  // ----------------------------------------------------
  // Keith,  8/10/2017, 09:49:29
  // ----------------------------------------------------
  // Method: Graph_Pic_RotateXLabels
  // -
  // INPUT1: Pointer - to SVG Picture from the Graph command
  // {INPUT2}: Real - degrees to rotate (90 is vertical; 22.5 is Default)
  // OUTPUT:  None - INPUT1 is changed
  // ----------------------------------------------------

$Options:=SVG_Get_options
$Options:=$Options ?- 6  //silence the beep on err
SVG_SET_OPTIONS ($Options)


C_POINTER($picPtr;$1)
C_REAL($rotate;$2)
C_LONGINT($x;$y;$maxW;$w;$h)

$picPtr:=$1
If (Count parameters>1)
$rotate:=$2
Else
$rotate:=22.5
End if

$svg:=SVG_Open_picture ($picPtr->)

$ref:=SVG_Find_ID ($svg;"ID_x_values")  // this is the x labels group
If ($ref="")
$ref:=SVG_Find_ID ($svg;"ID_x$value")  // debug inspired by v16R4 - this is where it beeped
End if

If ($ref#"")
ARRAY TEXT($aRef;0)
SVG_ELEMENTS_TO_ARRAYS ($ref;->$aRef)  // get all the x labels
$size:=Size of array($aRef)
For ($i;1;$size)
SVG_SET_ATTRIBUTES ($aRef{$i};"text-anchor";"start")  // they were middle

$tmpS:=SVG_New   // get the size of this label
$refT:=SVG_Add_object ($tmpS;$aRef{$i})
SVG_SET_XY ($refT;0;0)
$tmpP:=SVG_Export_to_picture ($tmpS)
PICTURE PROPERTIES($tmpP;$w;$h)
SVG_CLEAR ($tmpS)

$maxW:=Choose($maxW<$w;$w;$maxW)

DOM GET XML ATTRIBUTE BY NAME($aRef{$i};"x";$x)
DOM GET XML ATTRIBUTE BY NAME($aRef{$i};"y";$y)
$x:=$x-$h  // shift to taste
$y:=$y-$h

SVG_SET_XY ($aRef{$i};$x;$y)
SVG_ROTATION_CENTERED ($aRef{$i};$rotate)

End for

DOM GET XML ATTRIBUTE BY NAME($svg;"viewBox";$refT)
ARRAY TEXT($aCoord;0)
Parse_TextToArray ($refT;->$aCoord;" ")
$x:=Num($aCoord{1})  //  shift labels left
$y:=Num($aCoord{2})
$w:=Num($aCoord{3})
$h:=Num($aCoord{4})+($maxW*2)  // guess
SVG_SET_VIEWBOX ($svg;$x;$y;$w;$h)  // rotated labels make the picture taller

$picPtr->:=SVG_Export_to_picture ($svg)

End if

SVG_CLEAR ($svg)
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