Verwenden einer Formel zum Festlegen des Versatzes eines Linienmusters in QGIS 2.18

8

Ich habe versucht, Stadtgrenzen-Polygone mit einem 3-Farben-Streifenmuster (rot, orange, grün) zu füllen, dessen jeweilige Dicke proportional zu 3 Variablen ist, die für jede Stadt unterschiedlich sind, deren Summe jedoch immer 104 beträgt (siehe Abbildung zum Beispiel). .

Streifen Beispiel

Ich habe ein Linienmuster mit 3 Linien festgelegt, rot, orange und grün. Durch Festlegen des Abstands auf 4 mm und Verwenden eines Feldrechnerausdrucks gelang es mir, die Breite jeder Farbe zu variieren:

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

Die Ausdrücke zum Festlegen des Versatzes bewirken jedoch keine Änderung des Versatzes:

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

Streifen aufgetragen

Gibt es etwas, das ich nicht richtig eingestellt habe?

qgis style offset Stanislas Rebaudet
quelle
Ich habe versucht zu replizieren und habe das gleiche Problem (QGIS 2.14). Der Offset-Ausdruck scheint ignoriert zu werden. Ein Vorschlag ist, Ihren Stil als XML-Stildatei zu speichern und dies dann zu untersuchen. Eine andere Möglichkeit wäre, einen Weg zu finden, um die Zeichenreihenfolge der Linien zu steuern (so dass die dickste Linie zuerst gezeichnet wird, während andere oben gezeichnet werden). Dies würde das gleiche Endergebnis erzielen.
Cushen

Antworten:

1

Wenn wir das Problem anders angehen und jeden Zeilenversatz (0,1,2,3) vordefinieren und dann die Linienfarbe basierend auf einer Variablen ändern, können wir zum Endergebnis gelangen.

Angenommen, wie Sie zeigen, haben wir 4 gleich große Linien.

Getestetes Beispiel:

Gearbeitetes Beispiel

Nachfolgend finden Sie die Farbausdrücke und den gesamten QGIS-Stil, mit denen das Ergebnis erzielt wird.

Dies funktioniert für meinen Test, bei dem Variablen als v1, v2, v3 bezeichnet werden und die Variablenwerte 26, 52, 78, 0 sind (gleiche Teilungen von 104).

Farbausdrücke:

Offset 0 (oberste Zeile):

--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 (unterste Zeile):

--Offset 3 always red
'#f93131'

Vollständige Datei hier:

<!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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    </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">
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          <prop k="outline_style" v="solid"/>
          <prop k="outline_width" v="0.26"/>
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        <layer pass="0" class="LinePatternFill" locked="0">
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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>
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