Question

我想编写一个脚本，提示用户输入X和Y坐标。这些坐标将为现有形状文件添加一个点。另外，我应该使用哪个函数调用来获取这些坐标？

vectorLyr = QgsVectorLayer("D:/Projekty/qgis_projekt/forty922.shp", "Forty", "ogr")
vpr = vectorLyr.dataProvider()
x = QInputDialog.getDouble(None, 'input', 'Insert x: ')
y = QInputDialog.getDouble(None, 'input', 'Insert y: ')
pnt = QgsGeometry.fromPoint(QgsPoint(x,y))
f = QgsFeature()
f.setGeometry(pnt)
vpr.addFeatures([f])
vectorLyr.updateExtents()
QgsMapLayerRegistry.instance().addMapLayers([vectorLyr])

输入窗口工作正常，但Python控制台会抛出此语句

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "c:/users/hubi/appdata/local/temp/tmpxkrjpx.py", line 5, in <module>
    pnt = QgsGeometry.fromPoint(QgsPoint(x,y))
TypeError: arguments did not match any overloaded call:
  QgsPoint(): too many arguments
  QgsPoint(QgsPoint): argument 1 has unexpected type 'tuple'
  QgsPoint(float, float): argument 1 has unexpected type 'tuple'
  QgsPoint(QPointF): argument 1 has unexpected type 'tuple'
  QgsPoint(QPoint): argument 1 has unexpected type 'tuple'

当我在pnt变量中添加常数时，它运行良好。

pnt = QgsGeometry.fromPoint(QgsPoint(361637,501172))

有什么想法吗？

Answer 1

查看堆栈跟踪中的以下行：

QgsPoint(QgsPoint): argument 1 has unexpected type 'tuple'

python是解释器告诉你，当你期望一个整数时，你得到一个元组作为输入。将代码更改为以下内容：

vectorLyr = QgsVectorLayer("D:/Projekty/qgis_projekt/forty922.shp", "Forty", "ogr")
vpr = vectorLyr.dataProvider()
x = QInputDialog.getDouble(None, 'input', 'Insert x: ')
y = QInputDialog.getDouble(None, 'input', 'Insert y: ')
pnt = QgsGeometry.fromPoint(QgsPoint(x[0],y[0]))
f = QgsFeature()
f.setGeometry(pnt)
vpr.addFeatures([f])
vectorLyr.updateExtents()
QgsMapLayerRegistry.instance().addMapLayers([vectorLyr])

希望这有帮助！

如何在PyQGIS中输入点坐标？

1 个答案: