77 lines
3.1 KiB
Python
77 lines
3.1 KiB
Python
import sys
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from PyQt5.QtWidgets import QApplication, QLabel, QGraphicsView, QGraphicsScene, QGraphicsPixmapItem, QVBoxLayout, \
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QWidget, QMainWindow
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from PyQt5.QtCore import Qt, QPoint, QRectF
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from PyQt5.QtGui import QPixmap, QDrag
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class ImageLabel(QLabel):
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def __init__(self, parent=None):
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super(ImageLabel, self).__init__(parent)
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self.setPixmap(QPixmap("image.jpg")) # 替换为你的图片路径
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self.setScaledContents(True) # 图片将根据label的大小自动缩放
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self.label_moved = False # 用于判断是否移动了标签
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self.drag_start_position = QPoint() # 记录鼠标按下时的位置
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def mousePressEvent(self, event):
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if event.button() == Qt.LeftButton:
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self.drag_start_position = event.pos()
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self.label_moved = False
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def mouseMoveEvent(self, event):
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if not self.label_moved and (event.buttons() & Qt.LeftButton):
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distance = (event.pos() - self.drag_start_position).manhattanLength()
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if distance >= QApplication.startDragDistance():
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self.label_moved = True
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drag = QDrag(self)
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drag.setMimeData(self.mimeData())
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drag.setPixmap(self.grab())
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drag.exec_(Qt.CopyAction | Qt.MoveAction)
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self.drag_start_position = event.pos()
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def mouseReleaseEvent(self, event):
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self.label_moved = False
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class ImageView(QGraphicsView):
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def __init__(self, parent=None):
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super(ImageView, self).__init__(parent)
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self.scene = QGraphicsScene(self)
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self.pixmap_item = QGraphicsPixmapItem()
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self.scene.addItem(self.pixmap_item)
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self.setScene(self.scene)
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self.setInteractive(True)
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self.setDragMode(QGraphicsView.ScrollHandDrag)
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def mousePressEvent(self, event):
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if event.button() == Qt.LeftButton:
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self.drag_start_position = event.pos()
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def mouseMoveEvent(self, event):
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if (event.buttons() & Qt.LeftButton) and (
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event.pos() - self.drag_start_position).manhattanLength() >= QApplication.startDragDistance():
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drag = QDrag(self)
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drag.setMimeData(self.mimeData())
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drag.setPixmap(self.grab())
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drag.exec_(Qt.CopyAction | Qt.MoveAction)
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self.drag_start_position = event.pos()
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def wheelEvent(self, event):
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if event.angleDelta().y() > 0:
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self.scaleView(1.2) # 放大图片
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elif event.angleDelta().y() < 0:
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self.scaleView(1 / 1.2) # 缩小图片
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def scaleView(self, scale):
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factor = self.transform().scale(scale, scale).mapRect(QRectF(0, 0, 100, 100)).size().width()
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if factor < 50: # 设置最小缩放限制，避免过度缩小导致无法看清内容
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return
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self.scale(scale, scale) # 缩小或放大视图中的所有内容，包括图形项和网格/坐标轴
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if __name__ == '__main__':
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app = QApplication(sys.argv)
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window = QMainWindow()
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layout = QVBoxLayout()
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# image_label = ImageLabel() # 显示图片的标签控件
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image_view = ImageView() # 显示图片的视图控件 |