198 lines
8.8 KiB
Python
198 lines
8.8 KiB
Python
import logging # 导入自定义日志工具
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from qgis._core import QgsScaleBarSettings, QgsLayoutExporter, QgsCoordinateTransform, QgsCoordinateReferenceSystem, \
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QgsPointXY, QgsGeometry, QgsRectangle
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class MapUtils:
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"""出图工具类（封装地图缩放、文本更新、比例尺调整、导出等功能）"""
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def __init__(self, config, project, layout):
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self.config = config # 配置参数
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self.project = project # QGIS项目对象
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self.layout = layout # 布局对象（用于地图排版）
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self.imap = layout.itemById("Map") # 获取ID为"Map"的地图项
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# 缩放
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def Zoom(self, rule, data):
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logging.info(data) # 记录缩放参数日志
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zoom = MapZoom(self.project, self.layout, self.imap) # 创建缩放操作对象
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# 2024 Zoom转换（将数字规则映射为方法名）
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# NO("10", "不缩放"),
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# PAN("11", "平移"),
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# LAYER("12", "单图层"),
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# M_LAYER("13", "多图层"),
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# DISTANCE("14", "距离"),
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# M_LAYER2("15", "按图层合并缩放");
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if rule == "11":
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rule = "FlatToCenter" # 平移至中心点
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elif rule == "12":
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rule = "Layer" # 单图层缩放
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elif rule == "13":
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rule = "LayerIntersect" # 多图层相交缩放
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elif rule == "14":
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rule = "CenterDistance" # 中心距离缩放
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elif rule == "15":
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rule = "LayerMerged" # 多图层合并缩放
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else:
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rule = "FlatToCenter" # 默认平移至中心点
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eval("zoom." + rule + "(data)") # 动态调用对应缩放方法
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# 文本更新
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def Update(self, model, key):
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label = self.layout.itemById(key) # 获取布局中ID为key的文本标签
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if (label != None):
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label.setText(model[key]) # 更新标签文本为model中key对应的值
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# 比例尺更新
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def UpdateScale(self):
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ScaleBar = self.layout.itemById("ScaleBar") # 获取ID为"ScaleBar"的比例尺控件
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if ScaleBar == None:
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logging.warning("比例尺不存在或控件标识不等于 ScaleBar") # 日志警告
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return
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# 设置比例尺段大小模式为"适应宽度"
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ScaleBar.setSegmentSizeMode(QgsScaleBarSettings.SegmentSizeMode.SegmentSizeFitWidth)
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ScaleBar.setMaximumBarWidth(70) # 最大宽度
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ScaleBar.setMinimumBarWidth(40) # 最小宽度
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# 布局设置器
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def QgsLayoutSettings(self):
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dpi = self.config["qgis"]["exportDpi"] # 设置dpi
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# 设置多个导出格式
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settings = {
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'PDF': QgsLayoutExporter.PdfExportSettings(),
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'PNG': QgsLayoutExporter.ImageExportSettings(),
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'JPG': QgsLayoutExporter.ImageExportSettings(),
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'SVG': QgsLayoutExporter.SvgExportSettings()
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}
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for img_format in ['PNG', 'JPG']:
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settings[img_format].dpi = dpi
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settings['JPG'].jpegQuality = 85
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return settings['PNG']
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# 导出图片
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def Export(self, path):
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try:
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qle = QgsLayoutExporter(self.layout) # 创建布局导出器
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# 布局设置
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setting = self.QgsLayoutSettings()
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# 导出为图片
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res = qle.exportToImage(path, setting)
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except Exception as e:
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raise Exception(f"导出失败... {str(e)}")
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class MapZoom:
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"""地图缩放操作类（封装多种缩放逻辑）"""
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def __init__(self, project, layout, imap):
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self.project = project # QGIS项目对象
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self.layout = layout # 布局对象
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self.imap = imap # 地图项对象
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# 设置坐标系转换
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def SetSrc(self, crs):
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qct = QgsCoordinateTransform() # 坐标系转换对象
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qct.setDestinationCrs(self.imap.crs()) # 目标坐标系为地图当前坐标系
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if crs == None:
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qct.setSourceCrs(QgsCoordinateReferenceSystem("EPSG:4326")) # 源坐标系默认WGS84（经纬度）
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else:
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qct.setSourceCrs(crs) # 自定义源坐标系
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return qct
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# 平移至中心点
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def FlatToCenter(self, data):
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logging.info("平移至中心点")
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qct = self.SetSrc(None) # 源坐标系为WGS84
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point = QgsPointXY(float(data["X"]), float(data["Y"])) # 解析中心点坐标（经纬度）
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qgm = QgsGeometry.fromWkt(point.asWkt()) # 转换为QGIS几何对象
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# 坐标转换（从源坐标系到地图坐标系）
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qgm.transform(qct, QgsCoordinateTransform.TransformDirection.ForwardTransform)
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cpoint = qgm.asPoint() # 转换后的中心点
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# 保持当前地图宽度和高度，以新中心点创建矩形范围
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qr = QgsRectangle.fromCenterAndSize(cpoint, self.imap.extent().width(), self.imap.extent().height())
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self.imap.zoomToExtent(qr) # 缩放至该范围（实现平移）
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# 中心距离缩放（以中心点为圆心，指定距离为半径缩放）
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def CenterDistance(self, data):
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logging.info("中心距离")
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qct = self.SetSrc(None)
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point = QgsPointXY(float(data["X"]), float(data["Y"])) # 中心点坐标
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qgm = QgsGeometry.fromWkt(point.asWkt())
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qgm.transform(qct, QgsCoordinateTransform.TransformDirection.ForwardTransform)
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# 缓冲距离（单位：公里，转换为米后缓冲），并扩大10%范围
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box = qgm.buffer(float(data["value"]) / 1000, 100).boundingBox() # 平面 4326
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# box = qgm.buffer(float(data["value"])/111,100).boundingBox()#投影坐标系下的缓冲计算
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self.imap.zoomToExtent(box.buffered(box.width() * 0.1))
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# 按单图层缩放（缩放至指定图层范围）
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def Layer(self, data):
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logging.info("按图层缩放")
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layers = self.project.mapLayersByName(data["value"]) # 根据名称获取图层
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if len(layers) == 0:
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logging.warning("图层不存在：" + data["value"]) # 图层不存在时警告
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return
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layer = layers[0]
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if layer.featureCount() == 0.0: # 图层无要素时，默认平移至中心点
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self.FlatToCenter(data)
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return
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qct = self.SetSrc(layer.crs()) # 源坐标系为图层坐标系
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# 将图层范围转换为几何对象
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qgm = QgsGeometry.fromWkt(layer.extent().asWktPolygon())
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qgm.transform(qct, QgsCoordinateTransform.TransformDirection.ForwardTransform) # 转换到地图坐标系
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box = qgm.boundingBox() # 获取范围矩形
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self.imap.zoomToExtent(box.buffered(box.width() * 0.1)) # 扩大10%范围后缩放
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# 多图层合并缩放（缩放至多个图层的合并范围）
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def LayerMerged(self, data):
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logging.info("多图层合并")
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layers = data["value"].split(",") # 图层名称以逗号分隔
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box = None
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for lay in layers:
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temp = self.project.mapLayersByName(lay)
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if len(temp) == 0:
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logging.warning("图层不存在：" + lay)
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else:
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layer = temp[0]
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qct = self.SetSrc(layer.crs())
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qgm = QgsGeometry.fromWkt(layer.extent().asWktPolygon())
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qgm.transform(qct, QgsCoordinateTransform.TransformDirection.ForwardTransform)
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if box == None:
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box = qgm.boundingBox() # 初始化范围
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else:
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box.combineExtentWith(qgm.boundingBox()) # 合并范围
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if box != None:
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self.imap.zoomToExtent(box.buffered(box.width() * 0.1)) # 扩大10%范围后缩放
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# 多图层相交缩放（缩放至多个图层的相交范围）
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def LayerIntersect(self, data):
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logging.info("多图层相交")
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layers = data["value"].split(",") # 图层名称以逗号分隔
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box = None
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for lay in layers:
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temp = self.project.mapLayersByName(lay)
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if len(temp) == 0:
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logging.warning("图层不存在：" + lay)
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else:
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layer = temp[0]
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qct = self.SetSrc(layer.crs())
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layer.selectAll() # 选中图层所有要素
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geom = None
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# 合并选中要素的几何范围
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for feature in layer.selectedFeatureIds():
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if geom == '':
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geom = layer.getGeometry(feature)
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else:
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geom = geom.combine(layer.getGeometry(feature))
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qgm = QgsGeometry.fromWkt(geom.asWkt())
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qgm.transform(qct, QgsCoordinateTransform.TransformDirection.ForwardTransform)
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if box == None:
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box = qgm.boundingBox() # 初始化范围
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else:
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box = box.intersection(qgm) # 计算相交范围
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if box != None:
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box = box.boundingBox()
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self.imap.zoomToExtent(box.buffered(box.width() * 0.1)) # 扩大10%范围后缩放
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