Usando uma fórmula para definir o deslocamento de um padrão de linha no QGIS 2.18

8

Eu tenho tentado preencher polígonos de limites de cidade com um padrão de listras de 3 cores (vermelho, laranja, verde), cuja espessura respectiva é proporcional a 3 variáveis, diferentes para cada cidade, mas cuja soma é sempre 104 (veja a figura por exemplo) .

Exemplo de listras

Defino um padrão de linha com 3 linhas, vermelho, laranja e verde. Fixando a distância em 4 mm e usando uma expressão de calculadora de campo, consegui fazer a largura de cada cor variar:

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

Mas as expressões para definir o deslocamento não produzem nenhuma alteração de deslocamento:

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

Listras aplicadas

Existe algo que não defini corretamente?

qgis  style  offset 
— Stanislas Rebaudet
fonte
Tentei replicar e estou tendo o mesmo problema (QGIS 2.14). A expressão de deslocamento parece ser ignorada. Uma sugestão é salvar seu estilo como um arquivo de estilo .qml e investigar isso. Outra possibilidade seria encontrar uma maneira de controlar a ordem de desenho das linhas (para que a linha mais grossa seja desenhada primeiro, com outras desenhadas no topo), isso obteria o mesmo resultado final.
— Cushen

Respostas:

1

Abordando o problema de maneira diferente e pré-definindo o deslocamento de cada linha (0,1,2,3) e, em seguida, alterando a cor da linha com base em uma variável , podemos chegar ao resultado final.

Supondo que você mostre, temos 4 linhas de tamanhos iguais.

Exemplo testado:

Exemplo Trabalhado

Abaixo estão as expressões de cores e o estilo geral do QGIS que alcançarão o resultado.

Isso funciona para o meu teste, onde as variáveis ​​são nomeadas como v1, v2, v3 e os valores das variáveis ​​são 26, 52, 78, 0 (divisões iguais de 104).

Expressões de cores:

Deslocamento 0 (linha superior):

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

Deslocamento 1:

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

Deslocamento 2:

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

Deslocamento 3 (linha inferior):

--Offset 3 always red
'#f93131'

Arquivo de estilo completo aqui:

<!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
<qgis version="2.14.1-Essen" minimumScale="-4.65661e-10" maximumScale="1e+08" simplifyDrawingHints="1" minLabelScale="0" maxLabelScale="1e+08" simplifyDrawingTol="1" simplifyMaxScale="1" hasScaleBasedVisibilityFlag="0" simplifyLocal="1" scaleBasedLabelVisibilityFlag="0">
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      <widgetv2config IsMultiline="0" fieldEditable="1" UseHtml="0" labelOnTop="0"/>
    </edittype>
    <edittype widgetv2type="TextEdit" name="v1">
      <widgetv2config IsMultiline="0" fieldEditable="1" UseHtml="0" labelOnTop="0"/>
    </edittype>
    <edittype widgetv2type="TextEdit" name="v2">
      <widgetv2config IsMultiline="0" fieldEditable="1" UseHtml="0" labelOnTop="0"/>
    </edittype>
    <edittype widgetv2type="TextEdit" name="v3">
      <widgetv2config IsMultiline="0" fieldEditable="1" UseHtml="0" labelOnTop="0"/>
    </edittype>
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          <prop k="offset" v="0,0"/>
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          <prop k="offset_unit" v="MM"/>
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          <prop k="outline_style" v="solid"/>
          <prop k="outline_width" v="0.26"/>
          <prop k="outline_width_unit" v="MM"/>
          <prop k="style" v="solid"/>
        </layer>
        <layer pass="0" class="LinePatternFill" locked="0">
          <prop k="angle" v="0"/>
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          <prop k="outline_width_unit" v="MM"/>
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            <layer pass="0" class="SimpleLine" locked="0">
              <prop k="capstyle" v="square"/>
              <prop k="color_dd_active" v="1"/>
              <prop k="color_dd_expression" v="'#f93131'"/>
              <prop k="color_dd_field" v=""/>
              <prop k="color_dd_useexpr" v="1"/>
              <prop k="customdash" v="5;2"/>
              <prop k="customdash_map_unit_scale" v="0,0,0,0,0,0"/>
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              <prop k="joinstyle" v="bevel"/>
              <prop k="line_color" v="176,178,179,255"/>
              <prop k="line_style" v="solid"/>
              <prop k="line_width" v="1"/>
              <prop k="line_width_unit" v="MM"/>
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  </labelattributes>
  <SingleCategoryDiagramRenderer diagramType="Pie">
    <DiagramCategory penColor="#000000" labelPlacementMethod="XHeight" penWidth="0" diagramOrientation="Up" minimumSize="0" barWidth="5" penAlpha="255" maxScaleDenominator="1e+08" backgroundColor="#ffffff" transparency="0" width="15" scaleDependency="Area" backgroundAlpha="255" angleOffset="1440" scaleBasedVisibility="0" enabled="0" height="15" sizeType="MM" minScaleDenominator="-4.65661e-10">
      <fontProperties description="MS Shell Dlg 2,8.25,-1,5,50,0,0,0,0,0" style=""/>
    </DiagramCategory>
  </SingleCategoryDiagramRenderer>
  <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>
— Cushen
fonte
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