Usando una fórmula para establecer el desplazamiento de un patrón de línea en QGIS 2.18

He estado tratando de llenar los polígonos de los límites de la ciudad con un patrón de rayas de 3 colores (rojo, naranja, verde), cuyo grosor respectivo es proporcional a 3 variables, diferentes para cada ciudad, pero cuya suma es siempre 104 (ver figura, por ejemplo) .

Establecí un patrón de línea con 3 líneas, rojo, naranja y verde. Fijando la distancia a 4 mm y usando una expresión de calculadora de campo, logré variar el ancho de cada color:

Variable_1/104*4    #for red
Variable_2/104*4    #for orange
Variable_3/104*4    #for green

Pero las expresiones para establecer el desplazamiento no producen ningún cambio de desplazamiento:

Variable_1/104*2                                            #for red
Variable_1/104*4 + Variable_2/104*2                         #for orange 
Variable_1/104*4 + Variable_2/104*4 + Variable_3/104*2      #for green

¿Hay algo que no configuré correctamente?

Abordando el problema de manera diferente y predefiniendo el desplazamiento de cada línea (0,1,2,3) y luego cambiando el color de la línea en función de una variable , podemos llegar al resultado final.

Asumiendo como muestra, tenemos 4 líneas de igual tamaño.

Ejemplo probado:

A continuación se muestran las expresiones de color y el estilo general de QGIS que lograrán el resultado.

Esto funciona para mi prueba donde las variables se nombran como v1, v2, v3 y los valores de las variables son 26, 52, 78, 0 (divisiones iguales de 104).

Expresiones de color:

Offset 0 (línea superior):

--offset 0
CASE 
    WHEN "v2" = (104/4)*2 THEN  '#ffe523'
    ELSE  '#277c3e' 
END

Offset 1:

--offset 1
CASE 
    WHEN "v1" = (104/4)*2 THEN  '#ffe523'
    WHEN "v1" = (104/4)*1 THEN  '#277c3e' 
END

Offset 2:

--offset 2
CASE 
    WHEN "v1" = (104/4)*2 THEN  '#f93131'
    WHEN "v3" = (104/4)*3 THEN  '#277c3e' 
    ELSE '#ffe523'
END

Offset 3 (línea inferior):

--Offset 3 always red
'#f93131'

Archivo de estilo completo aquí:

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          <prop k="offset_unit" v="MM"/>
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          <prop k="outline_style" v="solid"/>
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          <prop k="style" v="solid"/>
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  <DiagramLayerSettings yPosColumn="-1" linePlacementFlags="10" placement="0" dist="0" xPosColumn="-1" priority="0" obstacle="0" zIndex="0" showAll="1"/>
  <annotationform></annotationform>
  <excludeAttributesWMS/>
  <excludeAttributesWFS/>
  <attributeactions/>
  <editform></editform>
  <editforminit/>
  <editforminitcodesource>0</editforminitcodesource>
  <editforminitfilepath></editforminitfilepath>
  <editforminitcode><![CDATA[# -*- coding: utf-8 -*-
"""
QGIS forms can have a Python function that is called when the form is
opened.

Use this function to add extra logic to your forms.

Enter the name of the function in the "Python Init function"
field.
An example follows:
"""
from PyQt4.QtGui import QWidget

def my_form_open(dialog, layer, feature):
    geom = feature.geometry()
    control = dialog.findChild(QWidget, "MyLineEdit")
]]></editforminitcode>
  <featformsuppress>0</featformsuppress>
  <editorlayout>generatedlayout</editorlayout>
  <widgets/>
  <conditionalstyles>
    <rowstyles/>
    <fieldstyles/>
  </conditionalstyles>
  <layerGeometryType>2</layerGeometryType>
</qgis>