158 lines
5.1 KiB
Python
158 lines
5.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Created on 2018年3月24日
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@author: Irony
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@site: https://pyqt5.com, https://github.com/892768447
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@email: 892768447@qq.com
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@file: SimpleImageView
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@description: 图片视图
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"""
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import struct
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from time import time
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from PIL import Image
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from PIL.Image import fromarray
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from PIL.ImageQt import fromqpixmap
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from PyQt5.QtCore import QStandardPaths, Qt
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from PyQt5.QtGui import QColor, QPainter, QPixmap, QImage, qRgb, qRed, qGreen,\
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qBlue, QCursor
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from PyQt5.QtWidgets import QGraphicsView, QGraphicsScene, QFileDialog, \
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QGraphicsItem
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import numpy
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try:
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from PyQt5.QtOpenGL import QGLFormat # , QGL, QGLWidget
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hasOpenGL = True
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except Exception as e:
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print(e)
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hasOpenGL = False
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__Author__ = """By: Irony
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QQ: 892768447
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Email: 892768447@qq.com"""
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__Copyright__ = 'Copyright (c) 2018 Irony'
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__Version__ = 1.0
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class SimpleImageView(QGraphicsView):
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# 背景区域颜色
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backgroundColor = QColor(28, 31, 34)
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def __init__(self, *args, **kwargs):
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super(SimpleImageView, self).__init__(*args, **kwargs)
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# 设置背景颜色
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self.setBackgroundBrush(self.backgroundColor)
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# 缓存背景
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self.setCacheMode(self.CacheBackground)
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# 设置拖拽样式
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# self.setDragMode(self.ScrollHandDrag)
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self.setRenderHints(
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QPainter.Antialiasing | QPainter.TextAntialiasing | QPainter.SmoothPixmapTransform)
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# opengl
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if hasOpenGL and QGLFormat.hasOpenGL():
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# self.setViewport(QGLWidget(QGLFormat(QGL.SampleBuffers), self))
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self.setRenderHint(QPainter.HighQualityAntialiasing)
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self.setViewportUpdateMode(self.FullViewportUpdate)
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else:
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# 尝试通过分析需要重绘的区域来找到最佳的更新模式
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self.setViewportUpdateMode(self.SmartViewportUpdate)
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self._scene = QGraphicsScene(self)
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self.setScene(self._scene)
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# 图片item
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self._itemImage = None
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self._itemImageNew = None
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def keyReleaseEvent(self, event):
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"""按键处理事件"""
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self._scaleImage(event)
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super(SimpleImageView, self).keyReleaseEvent(event)
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def closeEvent(self, event):
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"""窗口关闭时清空场景中的所有item"""
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self._scene.clear()
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self._itemImage = None
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self._itemImageNew = None
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super(SimpleImageView, self).closeEvent(event)
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def _scaleImage(self, event):
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"""缩放图片操作"""
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item = self._scene.focusItem()
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if not item:
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item = self._scene.items()
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if not item:
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return
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item = item[0]
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# 获取item的缩放度
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scale = item.scale()
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if event.key() == Qt.Key_Plus:
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# 放大
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if scale >= 0.91:
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return
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item.setScale(scale + 0.1)
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elif event.key() == Qt.Key_Minus:
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# 缩小
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if scale <= 0.11:
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return
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item.setScale(scale - 0.1)
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def loadImage(self):
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path, _ = QFileDialog.getOpenFileName(
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self, '请选择图片', QStandardPaths.writableLocation(QStandardPaths.DesktopLocation), '图片文件(*.jpg *.png)')
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if not path:
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return
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if self._itemImageNew:
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self._scene.removeItem(self._itemImageNew)
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del self._itemImageNew
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self._itemImageNew = None
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if self._itemImage:
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# 删除以前的item
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self._scene.removeItem(self._itemImage)
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del self._itemImage
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self._itemImage = None
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self._itemImage = self._scene.addPixmap(QPixmap(path))
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self._itemImage.setFlag(QGraphicsItem.ItemIsMovable)
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self._itemImage.setFlag(QGraphicsItem.ItemIsFocusable)
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self._itemImage.setScale(0.1) # 默认加载比例
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self._scene.setFocusItem(self._itemImage)
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print(self._itemImage.zValue())
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size = self._itemImage.pixmap().size()
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# 调整图片在中间
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self._itemImage.setPos(
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-size.width() * self._itemImage.scale() / 2,
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-size.height() * self._itemImage.scale() / 2
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)
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def _greyScale(self):
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if not self._itemImage:
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return
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if self._itemImageNew:
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self._scene.removeItem(self._itemImageNew)
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del self._itemImageNew
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self._itemImageNew = None
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t = time()
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# QPixmap 转 PIL Image 转 numpy array
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image = numpy.array(fromqpixmap(self._itemImage.pixmap()).convert('L'))
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image = fromarray(image).toqpixmap()
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self._itemImageNew = self._scene.addPixmap(image)
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self._itemImageNew.setFlag(QGraphicsItem.ItemIsFocusable)
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self._itemImageNew.setFlag(QGraphicsItem.ItemIsMovable)
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self._itemImageNew.setScale(self._itemImage.scale()) # 默认加载比例
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self._scene.setFocusItem(self._itemImageNew)
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print(self._itemImageNew.zValue())
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print(time() - t)
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if __name__ == '__main__':
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import sys
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from PyQt5.QtWidgets import QApplication
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app = QApplication(sys.argv)
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w = SimpleImageView()
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w.resize(800, 600)
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w.show()
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sys.exit(app.exec_())
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