pyqgis二次开发实现鹰眼
时间: 2024-02-16 09:02:41 浏览: 273
可以使用PyQt5和QGIS API来实现鹰眼功能。以下是一个简单的实现步骤:
1. 创建一个QGIS窗口和鹰眼窗口。
```python
from qgis.gui import QgsMapCanvas, QgsMapCanvasLayer
from PyQt5.QtWidgets import QMainWindow, QDockWidget, QWidget, QVBoxLayout
# 创建QGIS窗口和鹰眼窗口
class MainWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.canvas = QgsMapCanvas(self)
self.canvas.setCanvasColor(Qt.white)
self.canvas.enableAntiAliasing(True)
self.canvas.useImageToRender(False)
self.setCentralWidget(self.canvas)
# 创建鹰眼窗口
self.overview = QgsMapCanvas(self)
self.overview.setCanvasColor(Qt.white)
self.overview.enableAntiAliasing(True)
self.overview.useImageToRender(False)
self.overview.setMinimumSize(200, 200)
self.overview.setMaximumHeight(200)
self.overview.setMaximumWidth(200)
self.overview.setExtent(self.canvas.extent())
self.overview.setVisible(True)
# 将鹰眼窗口添加到dockwidget中
dock = QDockWidget("Overview", self)
dock.setWidget(self.overview)
self.addDockWidget(Qt.RightDockWidgetArea, dock)
```
2. 将QGIS图层添加到窗口中。
```python
# 添加图层到QGIS窗口
layer = QgsVectorLayer("path/to/your/layer.shp", "Layer Name", "ogr")
if not layer.isValid():
print("Layer failed to load!")
else:
QgsProject.instance().addMapLayer(layer)
canvas_layer = QgsMapCanvasLayer(layer)
self.canvas.setExtent(layer.extent())
self.canvas.setLayers([canvas_layer])
self.overview.setLayers([canvas_layer])
```
3. 鹰眼窗口显示QGIS窗口中的全局视图。
```python
# 显示QGIS窗口中的全局视图到鹰眼窗口
def on_extent_changed(extent):
self.overview.setExtent(extent)
self.canvas.extentChanged.connect(on_extent_changed)
```
这样就实现了一个简单的鹰眼功能。你可以自己根据实际需要进行修改和扩展。
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