Pertanyaan Anda membuat saya penasaran.
Solusi ini hanya berfungsi untuk QGIS 2.x di Python Console
Seperti disebutkan dalam komentar saya di sini adalah ide saya untuk membuat garis lengkung dengan Python.
Saya memiliki dua lapisan titik:
saya. Satu memegang modal (id, modal)
ii. Satu memegang kota (id, kota, komuter)
Jumlah komuter "dipisahkan menjadi uang kertas" dan ini akan menjadi garis yang membangun busur. Jadi 371 komuter adalah kombinasi 3x100, 1x50, 2x10 dan 1x1 dan total 7 uang kertas. Setelah itu, garis ditata dengan gaya berdasarkan aturan.
Ini kodenya:
from qgis.gui import *
from qgis.utils import *
from qgis.core import *
from PyQt4 import QtGui, uic
from PyQt4.QtGui import *
from PyQt4.QtCore import *
for lyr in QgsMapLayerRegistry.instance().mapLayers().values():
if lyr.name() == "capital":
capital_layer = lyr
for lyr in QgsMapLayerRegistry.instance().mapLayers().values():
if lyr.name() == "town":
town_layer = lyr
# creating the memory layer
d_lyr = QgsVectorLayer('LineString', 'distance', 'memory')
QgsMapLayerRegistry.instance().addMapLayer(d_lyr)
prov = d_lyr.dataProvider()
prov.addAttributes( [ QgsField("id", QVariant.Int), QgsField("banknote",QVariant.Int)])
# function to create the banknotes
def banknoteOutput(number):
number_list = []
number_list.append(number)
banknote_count = []
temp_list = []
banknote_list = []
for n in number_list:
total_sum = 0
total = int(n/100)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 100])
n = n-(total*100)
total = int(n/50)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 50])
n = n-(total*50)
total = int(n/10)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 10])
n = n-(total*10)
total = int(n/5)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 5])
n = n-(total*5)
total = int(n/1)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 1])
for i in banknote_count:
temp_list.append(i*i[0])
banknote_list = [item for sublist in temp_list for item in sublist][1::2]
return banknote_list
# creating lines with the amount of banknotes
for capital in capital_layer.getFeatures():
for town in town_layer.getFeatures():
commuter_splitting = banknoteOutput(town['commuters'])
for i,banknote in enumerate(commuter_splitting):
angle = 2
distance = QgsDistanceArea()
distance.measureLine(capital.geometry().asPoint(), town.geometry().asPoint())
vect = QgsFeature()
vect.setGeometry(QgsGeometry.fromPolyline([capital.geometry().asPoint(), town.geometry().asPoint()]))
vect.geometry().rotate(0+(i*angle), capital.geometry().asPoint())
vect.setAttributes([int(town["id"]), int(banknote)])
prov.addFeatures([vect])
d_lyr.updateExtents()
d_lyr.triggerRepaint()
d_lyr.updateFields()
Hasilnya bisa seperti ini:
UPDATE: perbedaan pria / wanita
Hasil dalam 4 Lapisan Memori.
from qgis.gui import *
from qgis.utils import *
from qgis.core import *
from PyQt4 import QtGui, uic
from PyQt4.QtGui import *
from PyQt4.QtCore import *
for lyr in QgsMapLayerRegistry.instance().mapLayers().values():
if lyr.name() == "capital":
capital_layer = lyr
for lyr in QgsMapLayerRegistry.instance().mapLayers().values():
if lyr.name() == "town":
town_layer = lyr
# function to create the banknotes
def banknoteOutput(number):
number_list = []
number_list.append(number)
banknote_count = []
temp_list = []
banknote_list = []
for n in number_list:
total_sum = 0
total = int(n/100)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 100])
n = n-(total*100)
total = int(n/50)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 50])
n = n-(total*50)
total = int(n/10)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 10])
n = n-(total*10)
total = int(n/5)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 5])
n = n-(total*5)
total = int(n/1)
total_sum = total_sum + total
if total > 0:
banknote_count.append([total, 1])
for i in banknote_count:
temp_list.append(i*i[0])
banknote_list = [item for sublist in temp_list for item in sublist][1::2]
return banknote_list
# creating the male memory layer
cmt_male = QgsVectorLayer('LineString', 'Commuters_Male', 'memory')
QgsMapLayerRegistry.instance().addMapLayer(cmt_male)
prov_male = cmt_male.dataProvider()
prov_male.addAttributes( [ QgsField("id", QVariant.Int), QgsField("banknote",QVariant.Int)])
# creating the male polygon memory layer
cmt_male_polygon = QgsVectorLayer('Polygon', 'Commuters_Male_Poly', 'memory')
QgsMapLayerRegistry.instance().addMapLayer(cmt_male_polygon)
prov_cmt_male_polygon = cmt_male_polygon.dataProvider()
prov_cmt_male_polygon.addAttributes( [ QgsField("id", QVariant.Int), QgsField("banknote",QVariant.Int)])
# creating lines with the amount of banknotes
for capital in capital_layer.getFeatures():
for town in town_layer.getFeatures():
commuter_splitting = banknoteOutput(town['cmt_male'])
points = []
for i,banknote in enumerate(reversed(commuter_splitting)):
angle = 2
distance = QgsDistanceArea()
distance.measureLine(capital.geometry().asPoint(), town.geometry().asPoint())
vect = QgsFeature()
vect.setGeometry(QgsGeometry.fromPolyline([capital.geometry().asPoint(), town.geometry().asPoint()]))
vect.geometry().rotate(0+(i*angle), capital.geometry().asPoint())
vect.setAttributes([int(town["id"]), int(banknote)])
points.append(vect.geometry().asPolyline()[1])
prov_male.addFeatures([vect])
polygon = QgsFeature()
points.insert(0,capital.geometry().asPoint())
points.insert(len(points),capital.geometry().asPoint())
polygon.setGeometry(QgsGeometry.fromPolygon([points]))
polygon.setAttributes([1, 2])
prov_cmt_male_polygon.addFeatures([polygon])
cmt_male.updateExtents()
cmt_male.triggerRepaint()
cmt_male.updateFields()
cmt_male_polygon.updateExtents()
cmt_male_polygon.triggerRepaint()
cmt_male_polygon.updateFields()
# creating the female memory layer
cmt_female = QgsVectorLayer('LineString', 'Commuters_Female', 'memory')
QgsMapLayerRegistry.instance().addMapLayer(cmt_female)
prov_female = cmt_female.dataProvider()
prov_female.addAttributes( [ QgsField("id", QVariant.Int), QgsField("banknote",QVariant.Int)])
# creating the female polygon memory layer
cmt_female_polygon = QgsVectorLayer('Polygon', 'Commuters_Female_Poly', 'memory')
QgsMapLayerRegistry.instance().addMapLayer(cmt_female_polygon)
prov_cmt_female_polygon = cmt_female_polygon.dataProvider()
prov_cmt_female_polygon.addAttributes( [ QgsField("id", QVariant.Int), QgsField("banknote",QVariant.Int)])
# creating lines with the amount of banknotes
for capital in capital_layer.getFeatures():
for town in town_layer.getFeatures():
commuter_splitting = banknoteOutput(town['cmt_female'])
points = []
for i,banknote in enumerate(commuter_splitting):
angle = 2
distance = QgsDistanceArea()
distance.measureLine(capital.geometry().asPoint(), town.geometry().asPoint())
vect = QgsFeature()
vect.setGeometry(QgsGeometry.fromPolyline([capital.geometry().asPoint(), town.geometry().asPoint()]))
vect.geometry().rotate(-angle-(i*angle), capital.geometry().asPoint())
vect.setAttributes([int(town["id"]), int(banknote)])
points.append(vect.geometry().asPolyline()[1])
prov_female.addFeatures([vect])
polygon = QgsFeature()
points.insert(0,capital.geometry().asPoint())
points.insert(len(points),capital.geometry().asPoint())
polygon.setGeometry(QgsGeometry.fromPolygon([points]))
polygon.setAttributes([1, 2])
prov_cmt_female_polygon.addFeatures([polygon])
cmt_female.updateExtents()
cmt_female.triggerRepaint()
cmt_female.updateFields()
cmt_female_polygon.updateExtents()
cmt_female_polygon.triggerRepaint()
cmt_female_polygon.updateFields()
Hasilnya bisa seperti ini:
Satu hal yang tidak ideal dari sudut pandang kartografi:
Ukuran busur garis dapat mengganggu pada pandangan pertama, dalam cara busur yang lebih besar dapat mewakili lebih banyak penumpang. Busur bisa lebih besar dengan lebih sedikit komuter (289 komuter / 11 uang kertas) daripada yang lain dengan lebih banyak komuter (311 komuter / 5 uang kertas).
