# main_window.py（主窗口逻辑）
import os
import numpy as np
from PySide6.QtWidgets import QMainWindow, QFileDialog, QGraphicsScene, QGraphicsView, QMessageBox, QGraphicsPathItem
from PySide6.QtGui import QPainterPath, QPen, QBrush, QAction, QTransform, QImage, QPixmap, QColor
from PySide6.QtCore import Qt, QRectF, QPointF
from osgeo import ogr, gdal
from PySide6.QtWidgets import QInputDialog # 新增输入对话框
# 新增自定义图形项类（用于存储属性）
class FeatureItem(QGraphicsPathItem):
def __init__(self, path, attributes):
super().__init__(path)
self.attributes = attributes # 存储属性字典
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
self.setWindowTitle("GIS软件")
self.setGeometry(100, 100, 800, 600)
ogr.UseExceptions()
self.init_ui()
self.scene = QGraphicsScene(self)
self.graphicsView.setScene(self.scene)
# 新增：存储所有几何边界
self.total_bounds = QRectF()
def init_ui(self):
self.toolBar = self.addToolBar("工具")
self.actionOpen_Vector_Data = QAction("打开矢量数据", self)
self.toolBar.addAction(self.actionOpen_Vector_Data)
# 新增栅格动作
self.actionOpen_Raster_Data = QAction("打开栅格数据", self)
self.toolBar.addAction(self.actionOpen_Raster_Data) # 添加到工具栏
# 新增缓冲区分析按钮
self.actionBuffer_Analysis = QAction("缓冲区分析", self)
self.toolBar.addAction(self.actionBuffer_Analysis)
self.graphicsView = QGraphicsView()
self.setCentralWidget(self.graphicsView)
# 新增属性查询按钮
self.actionQuery_Attribute = QAction("属性查询", self)
self.toolBar.addAction(self.actionQuery_Attribute)
self.actionOpen_Vector_Data.triggered.connect(self.open_vector_data)
self.actionOpen_Raster_Data.triggered.connect(self.open_raster_data)
# 新增连接
self.actionBuffer_Analysis.triggered.connect(self.buffer_analysis)
self.actionQuery_Attribute.triggered.connect(self.enable_query_mode)
# 新增鼠标点击事件
self.graphicsView.setMouseTracking(True)
self.is_query_mode = False
# 新增波段组合按钮
self.actionBand_Combination = QAction("波段组合", self)
self.toolBar.addAction(self.actionBand_Combination)
self.actionBand_Combination.triggered.connect(self.open_band_combination)
# 新增栅格裁剪按钮（在init_ui方法末尾添加）
self.actionClip_Raster = QAction("栅格裁剪", self)
self.toolBar.addAction(self.actionClip_Raster)
self.actionClip_Raster.triggered.connect(self.clip_raster) # 新增连接
self.actionBand_Calculation = QAction("波段运算", self)
self.toolBar.addAction(self.actionBand_Calculation)
self.actionBand_Calculation.triggered.connect(self.band_calculation)
# 新增质心绘制按钮（放在init_ui方法中）
self.actionDraw_Centroids = QAction("绘制质心", self)
self.toolBar.addAction(self.actionDraw_Centroids)
self.actionDraw_Centroids.triggered.connect(self.draw_centroids)
self.centroid_items = [] # 新增：存储质心图形项
# 新增空间查询按钮（放在init_ui方法中）
self.actionSpatial_Query = QAction("空间查询", self)
self.toolBar.addAction(self.actionSpatial_Query)
self.actionSpatial_Query.triggered.connect(self.enable_spatial_query_mode)
self.is_spatial_query_mode = False
self.spatial_query_results = [] # 存储查询结果
# 新增保存按钮（放在init_ui方法中）
self.actionSave_Vector = QAction("保存矢量数据", self)
self.toolBar.addAction(self.actionSave_Vector)
self.actionSave_Vector.triggered.connect(self.save_vector_data)
# 新增栅格保存按钮（放在init_ui方法中）
self.actionSave_Raster = QAction("保存栅格数据", self)
self.toolBar.addAction(self.actionSave_Raster)
self.actionSave_Raster.triggered.connect(self.save_raster_data)
def open_vector_data(self):
file_path, _ = QFileDialog.getOpenFileName(
self, "打开矢量文件", "",
"Shapefile (*.shp);;GeoJSON (*.geojson);;All Files (*)"
)
if file_path:
self.load_vector_data(file_path)
# 新增：自动缩放视图
self.auto_zoom()
def load_vector_data(self, file_path):
self.scene.clear()
self.total_bounds = QRectF() # 重置边界
try:
data_source = ogr.Open(file_path, 0)
layer = data_source.GetLayer(0)
for feature in layer:
geom = feature.GetGeometryRef()
path = self.geometry_to_qpainterpath(geom)
# 更新总边界
if path.boundingRect().isValid():
self.total_bounds = self.total_bounds.united(path.boundingRect())
pen = QPen(Qt.blue, 1)
brush = QBrush(Qt.cyan)
self.scene.addPath(path, pen, brush)
data_source = None
except Exception as e:
print(f"加载失败: {str(e)}")
self.current_vector_path = file_path # 新增这一行
data_source = None
def geometry_to_qpainterpath(self, geom):
path = QPainterPath()
if geom.GetGeometryType() == ogr.wkbPolygon:
for ring in range(geom.GetGeometryCount()):
linear_ring = geom.GetGeometryRef(ring)
points = linear_ring.GetPoints()
if points:
path.moveTo(points[0][0], points[0][1])
for p in points[1:]:
path.lineTo(p[0], p[1])
path.closeSubpath()
elif geom.GetGeometryType() == ogr.wkbLineString:
points = geom.GetPoints()
if points:
path.moveTo(points[0][0], points[0][1])
for p in points[1:]:
path.lineTo(p[0], p[1])
elif geom.GetGeometryType() == ogr.wkbPoint:
x, y = geom.GetX(), geom.GetY()
path.addEllipse(x - 2, y - 2, 4, 4)
return path
def auto_zoom(self):
"""自动缩放视图到数据范围并放大2倍"""
if not self.total_bounds.isValid():
return
# 设置场景边界
self.scene.setSceneRect(self.total_bounds)
# 获取视图可视区域
view_rect = self.graphicsView.viewport().rect()
# 计算缩放比例（自动适应 + 2倍放大）
transform = QTransform()
transform.scale(2, 2) # 先放大2倍
# 应用缩放并居中
self.graphicsView.setTransform(transform)
self.graphicsView.fitInView(self.total_bounds, Qt.KeepAspectRatio)
# 新增缓冲区分析方法
def buffer_analysis(self):
"""执行缓冲区分析"""
if not hasattr(self, 'current_vector_path'):
QMessageBox.warning(self, "警告", "请先打开矢量数据文件！")
return
# 获取缓冲距离
distance, ok = QInputDialog.getDouble(
self, "缓冲区分析",
"输入缓冲距离（单位与数据坐标系一致）:",
0.0, 0
)
if not ok:
return
try:
# 重新打开数据源获取几何
data_source = ogr.Open(self.current_vector_path, 0)
layer = data_source.GetLayer(0)
# 创建缓冲区路径
buffer_path = QPainterPath()
pen = QPen(Qt.red, 2, Qt.DashLine)
brush = QBrush(QColor(255, 0, 0, 50)) # 半透明红色填充
for feature in layer:
geom = feature.GetGeometryRef()
buffer_geom = geom.Buffer(distance)
path = self.geometry_to_qpainterpath(buffer_geom)
buffer_path.addPath(path)
# 添加到场景
self.scene.addPath(buffer_path, pen, brush)
# 更新视图边界
if buffer_path.boundingRect().isValid():
self.total_bounds = self.total_bounds.united(buffer_path.boundingRect())
self.auto_zoom()
data_source = None
except Exception as e:
QMessageBox.critical(self, "错误", f"缓冲区分析失败: {str(e)}")
def load_vector_data(self, file_path):
self.scene.clear()
self.total_bounds = QRectF()
try:
data_source = ogr.Open(file_path, 0)
layer = data_source.GetLayer(0)
# 获取字段定义
layer_defn = layer.GetLayerDefn()
field_names = [layer_defn.GetFieldDefn(i).GetName() for i in range(layer_defn.GetFieldCount())]
for feature in layer:
geom = feature.GetGeometryRef()
path = self.geometry_to_qpainterpath(geom)
# 创建属性字典
attributes = {
"FID": feature.GetFID(),
**{name: feature.GetField(name) for name in field_names}
}
# 使用自定义图形项
item = FeatureItem(path, attributes)
item.setPen(QPen(Qt.blue, 1))
item.setBrush(QBrush(Qt.cyan))
self.scene.addItem(item)
if path.boundingRect().isValid():
self.total_bounds = self.total_bounds.united(path.boundingRect())
data_source = None
except Exception as e:
print(f"加载失败: {str(e)}")
self.current_vector_path = file_path
data_source = None
# 新增属性查询方法
def enable_query_mode(self):
"""启用属性查询模式"""
self.is_query_mode = not self.is_query_mode
self.actionQuery_Attribute.setText("退出查询" if self.is_query_mode else "属性查询")
self.graphicsView.setCursor(Qt.CrossCursor if self.is_query_mode else Qt.ArrowCursor)
# 新增鼠标事件处理
def mousePressEvent(self, event):
if self.is_query_mode and event.button() == Qt.LeftButton:
scene_pos = self.graphicsView.mapToScene(event.pos())
items = self.scene.items(scene_pos, Qt.IntersectsItemShape, Qt.DescendingOrder)
for item in items:
if isinstance(item, FeatureItem):
# 构建属性信息字符串
info = "\n".join([f"{k}: {v}" for k, v in item.attributes.items()])
QMessageBox.information(self, "要素属性", info)
return
super().mousePressEvent(event)
def draw_centroids(self):
"""独立质心绘制功能"""
if not hasattr(self, 'current_vector_path'):
QMessageBox.warning(self, "警告", "请先打开矢量数据文件！")
return
# 清除已有质心
for item in self.centroid_items:
self.scene.removeItem(item)
self.centroid_items.clear()
try:
data_source = ogr.Open(self.current_vector_path, 0)
layer = data_source.GetLayer(0)
for feature in layer:
geom = feature.GetGeometryRef()
centroid = geom.Centroid()
if centroid:
# 创建质心图形项
path = QPainterPath()
path.addEllipse(
QRectF(
centroid.GetX() - 0.3, # 修改为0.3像素半径
centroid.GetY() - 0.3,
0.6, 0.6 # 直径0.6像素
)
)
item = self.scene.addPath(
path,
QPen(Qt.red, 0.1),
QBrush(Qt.red)
)
self.centroid_items.append(item)
data_source = None
self.auto_zoom()
except Exception as e:
QMessageBox.critical(self, "错误", f"质心绘制失败: {str(e)}")
# 新增空间查询模式切换方法
def enable_spatial_query_mode(self):
"""启用空间查询模式"""
self.is_spatial_query_mode = not self.is_spatial_query_mode
self.actionSpatial_Query.setText("退出空间查询" if self.is_spatial_query_mode else "空间查询")
self.graphicsView.setCursor(Qt.CrossCursor if self.is_spatial_query_mode else Qt.ArrowCursor)
if not self.is_spatial_query_mode:
self.clear_spatial_query_results()
# 新增空间查询处理方法
def mousePressEvent(self, event):
if self.is_spatial_query_mode and event.button() == Qt.LeftButton:
scene_pos = self.graphicsView.mapToScene(event.pos())
items = self.scene.items(scene_pos, Qt.IntersectsItemShape, Qt.DescendingOrder)
for item in items:
if isinstance(item, FeatureItem):
# 获取空间关系选择
relations = ["相交", "包含", "被包含", "接触", "重叠"]
relation, ok = QInputDialog.getItem(
self, "空间关系选择",
"请选择空间关系:",
relations, 0, False
)
if not ok:
return
# 执行空间查询
self.perform_spatial_query(item, relation)
return
super().mousePressEvent(event)
# 新增空间查询核心方法
def perform_spatial_query(self, source_item, relation):
"""执行空间查询并高亮结果"""
self.clear_spatial_query_results()
try:
# 获取源要素几何
source_geom = self.item_to_geometry(source_item)
if not source_geom:
return
# 获取所有要素
all_items = [item for item in self.scene.items() if isinstance(item, FeatureItem)]
# 遍历检查空间关系
for target_item in all_items:
target_geom = self.item_to_geometry(target_item)
if not target_geom:
continue
# 执行空间关系判断
if relation == "相交" and source_geom.Intersects(target_geom):
self.highlight_item(target_item)
elif relation == "包含" and source_geom.Contains(target_geom):
self.highlight_item(target_item)
elif relation == "被包含" and target_geom.Contains(source_geom):
self.highlight_item(target_item)
elif relation == "接触" and source_geom.Touches(target_geom):
self.highlight_item(target_item)
elif relation == "重叠" and source_geom.Overlaps(target_geom):
self.highlight_item(target_item)
except Exception as e:
QMessageBox.critical(self, "错误", f"空间查询失败: {str(e)}")
# 新增辅助方法
def item_to_geometry(self, item):
"""将图形项转换为OGR几何对象"""
path = item.path()
elements = path.toSubpathPolygons(QTransform())
if not elements:
return None
# 创建多边形几何
geom = ogr.Geometry(ogr.wkbPolygon)
ring = ogr.Geometry(ogr.wkbLinearRing)
for point in elements[0]:
ring.AddPoint(point.x(), point.y())
ring.CloseRings()
geom.AddGeometry(ring)
return geom
def highlight_item(self, item):
"""高亮显示查询结果"""
original_pen = item.pen()
highlight_pen = QPen(Qt.yellow, 3)
item.setPen(highlight_pen)
self.spatial_query_results.append((item, original_pen))
def clear_spatial_query_results(self):
"""清除查询结果高亮"""
for item, original_pen in self.spatial_query_results:
item.setPen(original_pen)
self.spatial_query_results.clear()
def open_raster_data(self):
"""打开栅格数据文件"""
file_path, _ = QFileDialog.getOpenFileName(
self, "打开栅格文件", "",
"GeoTIFF (*.tif);;JPEG (*.jpg *.jpeg);;PNG (*.png);;All Files (*)"
)
if file_path:
try:
self.load_raster_data(file_path)
self.auto_zoom()
except Exception as e:
QMessageBox.critical(self, "错误", f"加载栅格失败: {str(e)}")
def load_raster_data(self, file_path):
"""加载栅格数据到视图"""
# 打开栅格文件（需要用户修改路径的部分）
dataset = gdal.Open(file_path) # 相对路径示例："./data/raster.tif"
# 读取第一个波段
band = dataset.GetRasterBand(1)
width = dataset.RasterXSize
height = dataset.RasterYSize
# 转换为numpy数组
data = band.ReadAsArray()
# 创建QImage（注意数据类型转换）
if data.dtype == np.uint8:
format = QImage.Format.Format_Grayscale8
else:
format = QImage.Format.Format_ARGB32
q_img = QImage(data.tobytes(), width, height, format)
# 创建像素图项
pixmap = QPixmap.fromImage(q_img)
raster_item = self.scene.addPixmap(pixmap)
# 处理地理坐标（如果存在）
geotransform = dataset.GetGeoTransform()
if geotransform:
# 计算四个角的坐标
x_origin = geotransform[0]
y_origin = geotransform[3]
pixel_width = geotransform[1]
pixel_height = geotransform[5]
# 更新场景边界
x_min = x_origin
x_max = x_origin + pixel_width * width
y_min = y_origin + pixel_height * height
y_max = y_origin
self.total_bounds = QRectF(
QPointF(x_min, y_min),
QPointF(x_max, y_max)
)
dataset = None # 关闭数据集
def open_band_combination(self):
if not hasattr(self, 'current_raster_path'):
QMessageBox.warning(self, "警告", "请先打开栅格数据文件！")
return
# 复用open_raster_data的逻辑
self.open_raster_data()
def open_raster_data(self):
file_path, _ = QFileDialog.getOpenFileName(
self, "打开栅格文件", "",
"GeoTIFF (*.tif);;JPEG (*.jpg *.jpeg);;PNG (*.png);;All Files (*)"
)
if file_path:
try:
dataset = gdal.Open(file_path)
num_bands = dataset.RasterCount
# 获取用户输入的波段组合
red_band, ok1 = QInputDialog.getInt(
self, "波段选择",
f"红通道波段号 (1-{num_bands}):",
1, 1, num_bands
)
green_band, ok2 = QInputDialog.getInt(
self, "波段选择",
f"绿通道波段号 (1-{num_bands}):",
min(2, num_bands), 1, num_bands
)
blue_band, ok3 = QInputDialog.getInt(
self, "波段选择",
f"蓝通道波段号 (1-{num_bands}):",
min(3, num_bands), 1, num_bands
)
if not (ok1 and ok2 and ok3):
return
self.load_raster_data(file_path, red_band, green_band, blue_band)
self.auto_zoom()
self.current_raster_path = file_path # 新增存储当前路径
except Exception as e:
QMessageBox.critical(self, "错误", f"加载栅格失败: {str(e)}")
def load_raster_data(self, file_path, red_band=1, green_band=2, blue_band=3):
"""加载栅格数据到视图（支持波段组合）"""
dataset = gdal.Open(file_path)
width = dataset.RasterXSize
height = dataset.RasterYSize
# 读取三个波段数据
def read_band(band_num):
band = dataset.GetRasterBand(band_num)
data = band.ReadAsArray()
# 自动拉伸到0-255范围
data_min = data.min()
data_max = data.max()
return np.clip(((data - data_min) / (data_max - data_min) * 255), 0, 255).astype(np.uint8)
# 合并波段
rgb_array = np.dstack([
read_band(red_band),
read_band(green_band),
read_band(blue_band)
])
# 创建QImage
q_img = QImage(
rgb_array.data,
width,
height,
3 * width, # 每像素3字节（RGB）
QImage.Format.Format_RGB888
)
# 创建像素图项
pixmap = QPixmap.fromImage(q_img)
self.scene.addPixmap(pixmap)
# 处理地理坐标（保持原有逻辑）
geotransform = dataset.GetGeoTransform()
if geotransform:
x_origin = geotransform[0]
y_origin = geotransform[3]
pixel_width = geotransform[1]
pixel_height = geotransform[5]
x_min = x_origin
x_max = x_origin + pixel_width * width
y_min = y_origin + pixel_height * height # 计算下边界
y_max = y_origin # 上边界
# 确保坐标顺序正确
if x_min > x_max:
x_min, x_max = x_max, x_min
if y_min > y_max:
y_min, y_max = y_max, y_min
self.total_bounds = QRectF(QPointF(x_min, y_min), QPointF(x_max, y_max))
dataset = None
# 新增栅格裁剪方法（必须缩进在类内部）
def clip_raster(self):
"""执行栅格裁剪功能"""
if not hasattr(self, 'current_raster_path'):
QMessageBox.warning(self, "警告", "请先打开栅格数据文件！")
return
# 选择裁剪矢量文件
vector_path, _ = QFileDialog.getOpenFileName(
self, "选择裁剪区域文件", "",
"Shapefile (*.shp);;GeoJSON (*.geojson);;All Files (*)"
)
if not vector_path:
return
try:
# 获取原始栅格信息
src_ds = gdal.Open(self.current_raster_path)
geotransform = src_ds.GetGeoTransform()
proj = src_ds.GetProjection()
# 获取矢量范围
vector_ds = ogr.Open(vector_path)
layer = vector_ds.GetLayer()
feature = layer.GetNextFeature()
geom = feature.GetGeometryRef()
x_min, x_max, y_min, y_max = geom.GetEnvelope()
# 创建临时裁剪结果文件
import os # 确保导入os模块
output_path = os.path.splitext(self.current_raster_path)[0] + "_clipped.tif"
# 执行裁剪操作
options = gdal.WarpOptions(
format='GTiff',
outputBounds=[x_min, y_min, x_max, y_max],
dstSRS=proj
)
gdal.Warp(output_path, src_ds, options=options)
# 加载裁剪结果
self.load_raster_data(output_path)
self.auto_zoom()
# 清理资源
src_ds = None
vector_ds = None
except Exception as e:
QMessageBox.critical(self, "错误", f"栅格裁剪失败: {str(e)}")
# 新增波段运算方法
def band_calculation(self):
"""执行波段运算（示例为NDVI计算）"""
if not hasattr(self, 'current_raster_path'):
QMessageBox.warning(self, "警告", "请先打开栅格数据文件！")
return
try:
# 获取用户输入参数
red_band, ok1 = QInputDialog.getInt(
self, "波段选择",
"输入红波段编号 (1-based):",
1, 1, 100
)
nir_band, ok2 = QInputDialog.getInt(
self, "波段选择",
"输入近红外波段编号 (1-based):",
4, 1, 100
)
if not (ok1 and ok2):
return
# 读取栅格数据
dataset = gdal.Open(self.current_raster_path)
red = dataset.GetRasterBand(red_band).ReadAsArray()
nir = dataset.GetRasterBand(nir_band).ReadAsArray()
# 执行NDVI计算
ndvi = np.where(
(nir + red) == 0,
0,
(nir - red) / (nir + red)
).astype(np.float32)
# 创建输出文件
output_path, _ = QFileDialog.getSaveFileName(
self, "保存结果", "",
"GeoTIFF (*.tif)"
)
if not output_path:
return
# 写入结果
driver = gdal.GetDriverByName('GTiff')
out_ds = driver.Create(
output_path,
dataset.RasterXSize,
dataset.RasterYSize,
1,
gdal.GDT_Float32
)
out_ds.SetGeoTransform(dataset.GetGeoTransform())
out_ds.SetProjection(dataset.GetProjection())
out_ds.GetRasterBand(1).WriteArray(ndvi)
out_ds.FlushCache()
# 清理资源
dataset = None
out_ds = None
QMessageBox.information(self, "成功", f"NDVI计算结果已保存至：\n{output_path}")
except Exception as e:
QMessageBox.critical(self, "错误", f"波段运算失败: {str(e)}")
# 新增保存方法
def save_vector_data(self):
"""保存当前场景中的矢量数据"""
if not hasattr(self, 'current_vector_path'):
QMessageBox.warning(self, "警告", "没有可保存的矢量数据！")
return
# 获取保存路径
file_path, _ = QFileDialog.getSaveFileName(
self, "保存矢量文件", "",
"Shapefile (*.shp);;GeoJSON (*.geojson);;All Files (*)"
)
if not file_path:
return
try:
# 获取原始数据源信息
src_ds = ogr.Open(self.current_vector_path)
src_layer = src_ds.GetLayer(0)
src_defn = src_layer.GetLayerDefn()
# 创建目标数据源
driver = ogr.GetDriverByName("ESRI Shapefile" if file_path.endswith(".shp") else "GeoJSON")
if os.path.exists(file_path):
driver.DeleteDataSource(file_path)
dst_ds = driver.CreateDataSource(file_path)
# 创建图层（保持与原始数据相同的坐标系）
dst_layer = dst_ds.CreateLayer(
"saved_features",
srs=src_layer.GetSpatialRef(),
geom_type=ogr.wkbPolygon
)
# 复制字段定义
for i in range(src_defn.GetFieldCount()):
field_defn = src_defn.GetFieldDefn(i)
dst_layer.CreateField(field_defn)
# 遍历场景中的所有要素项
for item in self.scene.items():
if isinstance(item, FeatureItem):
# 创建新要素
feature = ogr.Feature(dst_layer.GetLayerDefn())
# 复制属性
for key, value in item.attributes.items():
if key == "FID":
continue # FID通常自动生成
if feature.GetFieldIndex(key) != -1:
feature.SetField(key, str(value))
# 转换几何
geom = self.item_to_geometry(item)
if geom:
feature.SetGeometry(geom)
dst_layer.CreateFeature(feature)
feature = None
# 添加缓冲区要素（如果存在）
self.save_additional_features(dst_layer, "buffer")
# 添加质心要素（如果存在）
self.save_additional_features(dst_layer, "centroid")
dst_ds = None
src_ds = None
QMessageBox.information(self, "成功", f"数据已保存至：\n{file_path}")
except Exception as e:
QMessageBox.critical(self, "错误", f"保存失败: {str(e)}")
# 新增辅助保存方法
def save_additional_features(self, layer, feature_type):
"""保存附加要素（缓冲区/质心）"""
items = []
if feature_type == "buffer":
items = [item for item in self.scene.items()
if item.pen().style() == Qt.DashLine and item.pen().color() == Qt.red]
elif feature_type == "centroid":
items = self.centroid_items
for item in items:
geom = self.item_to_geometry(item)
if geom:
feature = ogr.Feature(layer.GetLayerDefn())
feature.SetGeometry(geom)
# 添加类型标识字段
feature.SetField("FEATURE_TYPE", feature_type.upper())
layer.CreateFeature(feature)
feature = None
# 在item_to_geometry方法中添加点要素支持
def item_to_geometry(self, item):
"""增强版几何转换（支持点要素）"""
path = item.path()
elements = path.toSubpathPolygons(QTransform())
if not elements:
# 处理点要素
if isinstance(item, QGraphicsPathItem):
path = item.path()
if path.elementCount() == 1 and path.elementAt(0).isMoveTo():
pt = path.elementAt(0)
geom = ogr.Geometry(ogr.wkbPoint)
geom.AddPoint(pt.x, pt.y)
return geom
return None
# 原有多边形处理逻辑
geom = ogr.Geometry(ogr.wkbPolygon)
ring = ogr.Geometry(ogr.wkbLinearRing)
for point in elements[0]:
ring.AddPoint(point.x(), point.y())
ring.CloseRings()
geom.AddGeometry(ring)
return geom
# 新增栅格保存方法
def save_raster_data(self):
"""保存当前显示的栅格数据"""
if not hasattr(self, 'current_raster_path'):
QMessageBox.warning(self, "警告", "没有可保存的栅格数据！")
return
# 获取保存路径和格式
file_path, selected_filter = QFileDialog.getSaveFileName(
self, "保存栅格文件", "",
"GeoTIFF (*.tif);;JPEG (*.jpg *.jpeg);;PNG (*.png);;All Files (*)"
)
if not file_path:
return
try:
# 获取当前显示的栅格数据
dataset = gdal.Open(self.current_raster_path)
band_count = dataset.RasterCount
width = dataset.RasterXSize
height = dataset.RasterYSize
# 创建输出数据集
driver = gdal.GetDriverByName(self.get_driver_name(file_path))
out_ds = driver.Create(
file_path,
width,
height,
band_count,
self.get_gdal_datatype(dataset)
)
# 复制地理参考信息
out_ds.SetGeoTransform(dataset.GetGeoTransform())
out_ds.SetProjection(dataset.GetProjection())
# 复制所有波段数据
for band_num in range(1, band_count + 1):
in_band = dataset.GetRasterBand(band_num)
out_band = out_ds.GetRasterBand(band_num)
out_band.WriteArray(in_band.ReadAsArray())
out_band.FlushCache()
# 清理资源
out_ds = None
dataset = None
QMessageBox.information(self, "成功", f"栅格数据已保存至：\n{file_path}")
except Exception as e:
QMessageBox.critical(self, "错误", f"栅格保存失败: {str(e)}")
# 新增辅助方法
def get_driver_name(self, file_path):
"""根据文件扩展名获取GDAL驱动名称"""
ext = os.path.splitext(file_path)[1].lower()
return {
'.tif': 'GTiff',
'.jpg': 'JPEG',
'.jpeg': 'JPEG',
'.png': 'PNG'
}.get(ext, 'GTiff')
def get_gdal_datatype(self, dataset):
"""获取与原始数据集匹配的GDAL数据类型"""
sample_band = dataset.GetRasterBand(1)
return {
gdal.GDT_Byte: gdal.GDT_Byte,
gdal.GDT_UInt16: gdal.GDT_UInt16,
gdal.GDT_Int16: gdal.GDT_Int16,
gdal.GDT_UInt32: gdal.GDT_UInt32,
gdal.GDT_Int32: gdal.GDT_Int32,
gdal.GDT_Float32: gdal.GDT_Float32,
gdal.GDT_Float64: gdal.GDT_Float64
}.get(sample_band.DataType, gdal.GDT_Float32)
你看看我的程序哪里出问题了，为什么属性查询我点了之后什么反应都没有啊，也没有弹窗什么的，之前还有弹窗显示我选中的地方的属性呢
Win32 API：实现文件选择框对话框居中
本文介绍了如何通过设置Win32 API的OPENFILENAME结构体及Hook函数，使得GetSaveFileName弹出的文件选择框在指定窗口居中显示。主要步骤包括设置OFN_ENABLEHOOK和OFN_EXPLORER标志，以及编写Hook回调函数WM_INITDIALOG，计算并调整对话框位置。
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