Utilisation d'une formule pour définir le décalage d'un motif de ligne sur QGIS 2.18

8

J'ai essayé de remplir les polygones des limites de la ville avec un motif de rayures 3 couleurs (rouge, orange, vert), dont l'épaisseur respective est proportionnelle à 3 variables, différentes pour chaque ville, mais dont la somme est toujours 104 (voir figure par exemple) .

Exemple de rayures

J'ai défini un motif de lignes avec 3 lignes, rouge, orange et vert. Fixant la distance à 4 mm et utilisant une expression de calculatrice de champ, j'ai réussi à faire varier la largeur de chaque couleur:

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

Mais les expressions pour définir le décalage ne produisent aucun changement de décalage:

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

Rayures appliquées

Y a-t-il quelque chose que je n'ai pas réglé correctement?

qgis  style  offset 
— Stanislas Rebaudet
source
J'ai essayé de répliquer et j'ai le même problème (QGIS 2.14). L'expression de décalage semble être ignorée. Une suggestion est d'enregistrer votre style en tant que fichier de style .qml, puis d'étudier cela. Une autre possibilité serait de trouver un moyen de contrôler l'ordre de dessin des lignes (de sorte que la ligne la plus épaisse soit dessinée en premier, avec les autres dessinées en haut), cela permettrait d'obtenir le même résultat final.
— Cushen

Réponses:

1

En abordant le problème différemment et en prédéfinissant le décalage de chaque ligne (0,1,2,3) , puis en changeant la couleur de la ligne en fonction d'une variable, nous pouvons arriver au résultat final.

En supposant que vous le montrez, nous avons 4 lignes de taille égale.

Exemple testé:

Exemple travaillé

Vous trouverez ci-dessous les expressions de couleur et le style QGIS global qui permettront d'obtenir le résultat.

Cela fonctionne pour mon test où les variables sont nommées v1, v2, v3 et les valeurs des variables sont 26, 52, 78, 0 (divisions égales de 104).

Expressions de couleur:

Décalage 0 (ligne supérieure):

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

Décalage 1:

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

Décalage 2:

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

Décalage 3 (ligne du bas):

--Offset 3 always red
'#f93131'

Fichier de style complet ici:

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      <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>
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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
source
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