Menggunakan rumus untuk mengatur offset pola garis pada QGIS 2.18

8

Saya telah mencoba untuk mengisi poligon batas kota dengan pola garis-garis 3 warna (merah, oranye, hijau), yang ketebalannya masing-masing sebanding dengan 3 variabel, berbeda untuk setiap kota, tetapi yang jumlahnya selalu 104 (lihat gambar misalnya) .

Contoh garis-garis

Saya menetapkan pola garis dengan 3 garis, merah, oranye dan hijau. Memperbaiki jarak ke 4mm dan menggunakan ekspresi kalkulator lapangan, saya berhasil membuat lebar setiap warna berbeda:

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

Tetapi ekspresi untuk mengatur offset tidak menghasilkan perubahan offset:

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

Garis-garis diterapkan

Apakah ada sesuatu yang saya tidak atur dengan benar?

qgis  style  offset 
— Stanislas Rebaudet
sumber
Saya mencoba meniru dan mengalami masalah yang sama (QGIS 2.14). Ekspresi offset tampaknya diabaikan. Satu saran adalah untuk menyimpan gaya Anda sebagai file gaya .qml dan kemudian selidiki ini. Kemungkinan lain adalah menemukan cara untuk mengontrol urutan gambar garis (sehingga garis paling tebal ditarik terlebih dahulu, dengan yang lain digambar di atas), ini akan mencapai hasil akhir yang sama.
— Cushen

Jawaban:

1

Mendekati masalah secara berbeda dan menentukan terlebih dahulu setiap garis diimbangi (0,1,2,3) dan kemudian mengubah warna garis berdasarkan variabel maka kita bisa sampai ke hasil akhir.

Dengan asumsi seperti yang Anda tunjukkan, kami memiliki 4 garis berukuran sama.

Contoh yang Diuji:

Contoh yang berhasil

Di bawah ini adalah ekspresi warna dan gaya QGIS keseluruhan yang akan mencapai hasil.

Ini berfungsi untuk pengujian saya di mana Variabel dinamai sebagai v1, v2, v3 dan nilai variabel adalah 26, 52, 78, 0 (pembagian sama dengan 104).

Ekspresi Warna:

Offset 0 (baris atas):

--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 (garis bawah):

--Offset 3 always red
'#f93131'

File gaya penuh di sini:

<!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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    <buffersize fieldname="" units="pt" value="1"/>
    <bufferenabled fieldname="" on=""/>
    <multilineenabled fieldname="" on=""/>
    <selectedonly on=""/>
  </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
sumber
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