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13693261870

2022-11-05 bfe3c6cb6e962de9e82448fea707e9c26de0a6f4

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 QGIS/data/counties.dbf

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 QGIS/data/counties.prj

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GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]

 QGIS/data/counties.shp

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 QGIS/data/counties.shp.mwsymb

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<MapWinGIS OcxVersion="4.8" FileType="LayerFile" FileVersion="0" Description="">
  <Layer LayerType="Shapefile" LayerName="counties" LayerVisible="1" LayerKey="" MinVisibleScale="1.000000" MaxVisibleScale="4901750.000000" Filename="">
    <ShapefileClass>
      <DefaultDrawingOptions FillBgColor="0" FillColor="2928376" FillVisible="0" LineColor="4224439" PointShapeRatio="1.000000" />
      <ShapefileCategoriesClass />
      <LabelsClass FrameBackColor="16777215" FrameOutlineColor="1971946" FrameType="1" FrameVisible="-1" Generated="1" MaxVisibleScale="4901750.000000" MinVisibleScale="1.000000" AutoOffset="0" Positioning="1" Expression="[MWShapeID] " />
      <ChartsClass ValuesFontName="" Visible="-1" />
    </ShapefileClass>
  </Layer>
</MapWinGIS>

 QGIS/data/counties.shx

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 QGIS/main.py

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from qgis.core import *
# from qgis.gui import (QgsLayerTreeMapCanvasBridge)
from qgis.gui import *
from qgis.PyQt.QtGui import (QColor)

# QgsApplication.setPrefixPath("e:/", True)

qgs = QgsApplication([], True)
qgs.initQgis()


# åˆ›å»ºå®žä¾‹
project = QgsProject.instance()
project.read(r'E:/data/1.Natural_Earth/Test.qgz')
print("FileName: " + project.fileName())

# canvas = QgsMapCanvas()
# canvas.show()
# bridge = QgsLayerTreeMapCanvasBridge(QgsProject.instance().layerTreeRoot(), canvas)

layers_list = {}
for layer in project.mapLayers().values():
    layers_list[layer.name()] = layer
print(layers_list)

openStreetMapLayer = project.mapLayersByName("OpenStreetMap")[0]
print(openStreetMapLayer)

root = project.layerTreeRoot()
print(root.findLayerIds()[0])

# ä¿å­˜ï¼Œå¦å­˜ä¸º
# project.write()
# project.write("E:/new_qgis_project.qgz")
qgs.exitQgis()

# qgs.exitQgis()

 QGIS/render.py

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import os
from qgis.core import *
from qgis.gui import *
from qgis.PyQt.QtGui import *
from qgis.PyQt.QtCore import *
from qgis.PyQt.QtWidgets import *
from qgis.PyQt.QtXml import *

def finished():
    img = render.renderedImage()
    # QgsProject.instance().homePath()
    image_location = os.path.join("e:/", "render.png")
    # save the image; e.g. img.save("/Users/myuser/render.png","png")
    img.save(image_location, "png")

QgsApplication.setPrefixPath("C:/Program Files/QGIS 3.16/bin", True)
qgs = QgsApplication([], True)
qgs.initQgis()

# vlayer = iface.activeLayer()
project = QgsProject.instance()
project.read(r'E:/data/1.Natural_Earth/Test.qgz')

layers = project.mapLayers().values()
# root = project.layerTreeRoot()

# layout = QgsPrintLayout(project)
layout = QgsLayout(project)
# layout.initializeDefaults()

with open("E:/data/1.Natural_Earth/Layout.qpt", 'r', encoding='utf-8') as f:
    template_content = f.read()
doc = QDomDocument()
doc.setContent(template_content)
# doc = QDomDocument("E:/data/1.Natural_Earth/Layout.qpt")
#ele = layout.writeXml(doc, QgsReadWriteContext())
#layout.readLayoutXml(ele, doc, QgsReadWriteContext())
layout.loadFromTemplate(doc, QgsReadWriteContext(), False)

map = QgsLayoutItemMap(layout)
# # map.zoomToExtent(layers[0].extent())
layout.addItem(map)

# collection = layout.pageCollection()
# page = QgsLayoutItemPage(layout)
# page.setPageSize('A4')
# collection.addPage(page)

layoutView = QgsLayoutView()
layoutView.setPreviewModeEnabled(True)
layoutView.setContentsMargins(0, 0, 0, 0)
layoutView.setCurrentLayout(layout)

# project.layoutManager().addLayout(layout)
# map = QgsLayoutItemMap(layout)
# map.zoomToExtent(iface.mapCanvas().extent())

exporter = QgsLayoutExporter(layout)
img_path = os.path.join("e:/", "render.png")
exporter.exportToImage(img_path, QgsLayoutExporter.ImageExportSettings())

qgs.exitQgis()

 QGIS/ui.py

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import os
import sys
from qgis.gui import *
from qgis.core import *
from qgis.PyQt.QtCore import *
from qgis.PyQt.QtWidgets import *


class MapViewer(QMainWindow):
    def __init__(self, shapefile):
        QMainWindow.__init__(self)
        self.setWindowTitle("Map Viewer")

        canvas = QgsMapCanvas()
        canvas.setCanvasColor(Qt.white)
        canvas.show()

        project = QgsProject.instance()
        project.read(r'E:/data/1.Natural_Earth/Test.qgz')

        layer = QgsVectorLayer(shapefile, "layer1", "ogr")
        if not layer.isValid():
            raise IOError("Invalid shapefile")

        # project.addMapLayer(layer)
        # canvas.setExtent(layer.extent())
        # canvas.setLayers([layer])
        layers = project.mapLayers().values()
        canvas.setLayers(layers)

        layout = QVBoxLayout()
        layout.addWidget(canvas)

        contents = QWidget()
        contents.setLayout(layout)
        self.setCentralWidget(contents)


if __name__ == "__main__":
    QgsApplication.setPrefixPath("qgis", True)
    qgs = QgsApplication([], True)
    qgs.initQgis()

    viewer = MapViewer("./data/Counties.shp")
    viewer.show()
    exitCode = qgs.exec()

    qgs.exitQgis()

 QGIS/˵Ã÷.txt

@@ -21,6 +21,7 @@
>>> import qgis.core

================================================================================ åº“简介
格式化：ctrl + alt + l
PyQGIS库的五个包：
qgis.core                 è¿™æ ·å¯ä»¥è®¿é—®æ•´ä¸ªQGIS中使用的核心GIS功能。
qgis.gui                  è¿™å®šä¹‰äº†ä¸€ç³»åˆ—GUI小部件，您可以在自己的程序中包含这些小部件。
@@ -28,10 +29,12 @@
qgis.networkanalysis    è¿™æä¾›äº†æž„建和分析拓扑的工具。
qgis.utils                 è¿™å®žçŽ°äº†å„种功能，允许您使用Python使用QGIS应用程序。
================================================================================ æ‰§è¡Œ
exec(open('E:/terrait/TianJin/LFServer/QGIS/main.py', encoding='utf-8').read())
exec(open('E:/terrait/TianJin/LFServer/QGIS/render.py', encoding='utf-8').read())

python E:/terrait/TianJin/LFServer/QGIS/main.py
================================================================================
https://blog.csdn.net/qq_23034515/article/details/107643428
https://vimsky.com/examples/detail/python-ex-qgis.core-QgsPrintLayout-itemByUuid-method.html # ReadWriteXml
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