2021-11-08 pyqt5学习笔记——QLabel

每天学习一个小例子---------原资源已经上传了来源：https://pyqt.site , https://github.com/PyQt51图片加载显示#!/usr/bin/env python# -*- coding: utf-8 -*-"""Created on 2018年1月20日@author: Irony@site: https://pyqt.site , https://git

无损检测小白白

1156人浏览 · 2021-11-08 18:00:01

无损检测小白白 · 2021-11-08 18:00:01 发布

每天学习一个小例子---------原资源已经上传了

来源：

https://pyqt.site , https://github.com/PyQt5

1 图片加载显示

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Created on 2018年1月20日
@author: Irony
@site: https://pyqt.site , https://github.com/PyQt5
@email: 892768447@qq.com
@file: CircleImage
@description: 圆形图片
"""

try:
    from PyQt5.QtCore import Qt
    from PyQt5.QtGui import QPixmap, QPainter, QPainterPath
    from PyQt5.QtWidgets import QLabel, QWidget, QHBoxLayout, QApplication
except ImportError:
    from PySide2.QtCore import Qt
    from PySide2.QtGui import QPixmap, QPainter, QPainterPath
    from PySide2.QtWidgets import QLabel, QWidget, QHBoxLayout, QApplication


class Label(QLabel):

    def __init__(self, *args, antialiasing=True, **kwargs):
        super(Label, self).__init__(*args, **kwargs)
        self.Antialiasing = antialiasing   # 抗锯齿
        self.setMaximumSize(200, 200)
        self.setMinimumSize(200, 200)
        self.radius = 100  # 半径

        #####################核心实现#########################
        self.target = QPixmap(self.size())  # 大小和控件一样
        self.target.fill(Qt.transparent)  # 填充背景为透明

        p = QPixmap("Data/Images/head.jpg").scaled(  # 加载图片并缩放和控件一样大
            200, 200, Qt.KeepAspectRatioByExpanding, Qt.SmoothTransformation)
        # KeepAspectRatioByExpanding   通过扩展保持纵横比
        # SmoothTransformation  平滑变换

        painter = QPainter(self.target)  # 在target上画图
        if self.Antialiasing:
            # 抗锯齿
            painter.setRenderHint(QPainter.Antialiasing, True)      # 设置渲染   抗锯齿
            painter.setRenderHint(QPainter.HighQualityAntialiasing, True)  # 高质量抗锯齿
            painter.setRenderHint(QPainter.SmoothPixmapTransform, True)   # 平滑像素映射变换

        #         painter.setPen(# 测试圆圈
        #             QPen(Qt.red, 5, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
        path = QPainterPath()
        """
        QPainterPath类为绘制操作提供了一个容器，可以构造和重用图形形状。
        用途：它是由一些图形如曲线、矩形、椭圆组成的对象。主要的用途是，能保存已经绘制好的图形。实现图形元素的构造和复用；
        图形状只需创建一次，然后调用QPainter::drawPath()函数多次绘制。
        painterpath可以加入闭合或不闭合的图形(如：矩形、椭圆和曲线)。QPainterPath 可用于填充，描边，clipping。

        使用方法：QPainterPath一旦创建，直线和曲线都可以被添加入path，
        通过lineTo(),arcTo(),cubicTo()和 quadTo()函数。currentPosition()是最后一次绘制后的“结束点”（或初始点）。
        使用moveTo()移动currentPosition()而不会添加任何元素。moveTo() 隐含的开始一个新subpath，并且闭合前一个。 
        一个path 添加到另一个path 用connectPath()。它默认是从原点（0，0）开始绘图，可以使用moveTo（）改变绘图的开始位置。
        """

        path.addRoundedRect(  # 添加圆角矩形
            0, 0, self.width(), self.height(), self.radius, self.radius)
        # **** 切割为圆形 ****#
        painter.setClipPath(path)
        #         painter.drawPath(path)  # 测试圆圈

        painter.drawPixmap(0, 0, p)
        self.setPixmap(self.target)
        #####################核心实现#########################


class Window(QWidget):

    def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        layout = QHBoxLayout(self)
        layout.addWidget(Label(self))
        layout.addWidget(Label(self, antialiasing=False))
        self.setStyleSheet("background: black;")


if __name__ == "__main__":
    import sys

    app = QApplication(sys.argv)
    w = Window()
    w.show()
    sys.exit(app.exec_())

2 图片旋转

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Created on 2018年11月19日
@author: Irony
@site: https://pyqt.site , https://github.com/PyQt5
@email: 892768447@qq.com
@file: 
@description: 
"""

try:
    from PyQt5.QtCore import Qt
    from PyQt5.QtGui import QPixmap, QPainter, QImage
    from PyQt5.QtWidgets import QWidget, QLabel, QPushButton, \
        QVBoxLayout, QHBoxLayout, QSpacerItem, QSizePolicy, QApplication
except ImportError:
    from PySide2.QtCore import Qt
    from PySide2.QtGui import QPixmap, QPainter, QImage
    from PySide2.QtWidgets import QWidget, QLabel, QPushButton, \
        QVBoxLayout, QHBoxLayout, QSpacerItem, QSizePolicy, QApplication


class Window(QWidget):

    def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        layout = QVBoxLayout(self)
        self.imageLabel = QLabel(self)
        self.imageLabel.setAlignment(Qt.AlignCenter)  #设置对齐---对准中心
        layout.addWidget(self.imageLabel)
        clayout = QHBoxLayout()
        # 采用QBOXLayout类可以在水平和垂直方向上排列控件，QHBoxLayout和QVBoxLayout类继承自QBoxLayout
        # 采用QHBoxLayout类，按照从左到右的顺序来添加控件
        layout.addItem(clayout)  # 添加项
        clayout.addItem(QSpacerItem(  # 弹簧 间隔项
            40, 20, QSizePolicy.Expanding, QSizePolicy.Minimum))

        # 添加按钮
        clayout.addWidget(QPushButton('水平翻转', self, clicked=self.doHorFilp))
        clayout.addWidget(QPushButton('垂直翻转', self, clicked=self.doVerFilp))
        clayout.addWidget(QPushButton(
            '顺时针45度', self, clicked=self.doClockwise))
        clayout.addWidget(QPushButton(
            '逆时针45度', self, clicked=self.doAnticlockwise))
        clayout.addItem(QSpacerItem(
            40, 20, QSizePolicy.Expanding, QSizePolicy.Minimum))

        # 原始图片
        self.srcImage = QImage('Data/fg.png')
        self.imageLabel.setPixmap(QPixmap.fromImage(self.srcImage))

    def doHorFilp(self):
        # 水平翻转
        self.srcImage = self.srcImage.mirrored(True, False)  # 镜像
        self.imageLabel.setPixmap(QPixmap.fromImage(self.srcImage))

    def doVerFilp(self):
        # 垂直翻转
        self.srcImage = self.srcImage.mirrored(False, True)
        self.imageLabel.setPixmap(QPixmap.fromImage(self.srcImage))

    def doClockwise(self):
        # 顺时针45度
        image = QImage(self.srcImage.size(),
                       QImage.Format_ARGB32_Premultiplied)
        painter = QPainter()  # 创建绘图容器
        painter.begin(image)
        # 以图片中心为原点
        hw = self.srcImage.width() / 2
        hh = self.srcImage.height() / 2
        painter.translate(hw, hh)
        painter.rotate(45)  # 旋转45度
        painter.drawImage(-hw, -hh, self.srcImage)  # 把图片绘制上去
        painter.end()
        self.srcImage = image  # 替换
        self.imageLabel.setPixmap(QPixmap.fromImage(self.srcImage))

    #         # 下面这个旋转方法针对90度的倍数,否则图片会变大
    #         trans = QTransform()
    #         trans.rotate(90)
    #         self.srcImage = self.srcImage.transformed(
    #             trans, Qt.SmoothTransformation)
    #         self.imageLabel.setPixmap(QPixmap.fromImage(self.srcImage))

    def doAnticlockwise(self):
        # 逆时针45度
        image = QImage(self.srcImage.size(),
                       QImage.Format_ARGB32_Premultiplied)
        painter = QPainter()
        painter.begin(image)
        # 以图片中心为原点
        hw = self.srcImage.width() / 2
        hh = self.srcImage.height() / 2
        painter.translate(hw, hh)
        painter.rotate(-45)  # 旋转-45度
        painter.drawImage(-hw, -hh, self.srcImage)  # 把图片绘制上去
        painter.end()
        self.srcImage = image  # 替换
        self.imageLabel.setPixmap(QPixmap.fromImage(self.srcImage))


#         # 下面这个旋转方法针对90度的倍数,否则图片会变大
#         trans = QTransform()
#         trans.rotate(90)
#         self.srcImage = self.srcImage.transformed(
#             trans, Qt.SmoothTransformation)
#         self.imageLabel.setPixmap(QPixmap.fromImage(self.srcImage))


if __name__ == '__main__':
    import sys

    app = QApplication(sys.argv)
    w = Window()
    w.show()
    sys.exit(app.exec_())

3 仿网页图片错位显示

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Created on 2018年10月18日
@author: Irony
@site: https://pyqt.site , https://github.com/PyQt5
@email: 892768447@qq.com
@file: ImageSlipped
@description: 
"""

try:
    from PyQt5.QtGui import QPixmap, QPainter
    from PyQt5.QtWidgets import QWidget, QApplication
except ImportError:
    from PySide2.QtGui import QPixmap, QPainter
    from PySide2.QtWidgets import QWidget, QApplication


class SlippedImgWidget(QWidget):

    def __init__(self, bg, fg, *args, **kwargs):
        super(SlippedImgWidget, self).__init__(*args, **kwargs)
        # 开启鼠标跟踪
        self.setMouseTracking(True)
        # 背景
        self.bgPixmap = QPixmap(bg)
        # 前景
        self.pePixmap = QPixmap(fg)
        # 最小尺寸(背景右边和下方隐藏10个像素)
        size = self.bgPixmap.size()
        self.setMinimumSize(size.width() - 10, size.height() - 10)
        self.setMaximumSize(size.width() - 10, size.height() - 10)
        # 分成10份用于鼠标移动判断
        self.stepX = size.width() / 10
        self.stepY = size.height() / 10
        # 偏移量
        self._offsets = [-4, -4, -4, -4]  # 背景(-4,-4),前景(-4,-4)

    def mouseMoveEvent(self, event):
        super(SlippedImgWidget, self).mouseMoveEvent(event)
        pos = event.pos()

        # 偏移量
        offsetX = 5 - int(pos.x() / self.stepX)
        offsetY = 5 - int(pos.y() / self.stepY)
        self._offsets[0] = offsetX
        self._offsets[1] = offsetY
        self._offsets[2] = offsetX
        self._offsets[3] = offsetY
        # 刷新
        self.update()

    def paintEvent(self, event):
        super(SlippedImgWidget, self).paintEvent(event)
        # 绘制图形
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        # 左上角偏移5个像素画背景图片
        painter.drawPixmap(
            -5 + self._offsets[0],
            -5 + self._offsets[1], self.bgPixmap)
        # 右下角偏移5个像素画前景图片
        painter.drawPixmap(
            self.width() - self.pePixmap.width() + 5 - self._offsets[2],
            self.height() - self.pePixmap.height() + 5 - self._offsets[3],
            self.pePixmap
        )


if __name__ == '__main__':
    import sys

    app = QApplication(sys.argv)
    w = SlippedImgWidget('Data/bg1.jpg', 'Data/fg1.png')
    w.show()
    sys.exit(app.exec_())

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Created on 2018年10月25日
@author: Irony
@site: https://pyqt.site , https://github.com/PyQt5
@email: 892768447@qq.com
@file: NinePatch
@description: 
"""

import sys

try:
    from PyQt5.QtGui import QPainter
    from PyQt5.QtWidgets import QApplication, QWidget
except ImportError:
    from PySide2.QtGui import QPainter
    from PySide2.QtWidgets import QApplication, QWidget

from Lib.NinePatch import NinePatch


class Label(QWidget):

    def __init__(self, *args, **kwargs):
        super(Label, self).__init__(*args, **kwargs)
        # .9 格式的图片
        self.image = NinePatch('Data/skin_aio_friend_bubble_pressed.9.png')

    def paintEvent(self, event):
        super(Label, self).paintEvent(event)
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setRenderHint(QPainter.SmoothPixmapTransform)
        try:
            self.image.SetImageSize(self.width(), self.height())
            self.image.Draw(painter, 0, 0)
        except Exception as e:
            print(e)


app = QApplication(sys.argv)
w = Label()
w.resize(400, 200)
w.show()

sys.exit(app.exec_())

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Created on 2017年12月23日
@author: Irony
@site: https://pyqt.site , https://github.com/PyQt5
@email: 892768447@qq.com
@file: ShowImage
@description: 
"""
import sys

try:
    from PyQt5.QtCore import QResource
    from PyQt5.QtGui import QPixmap, QMovie
    from PyQt5.QtWidgets import QWidget, QApplication, QHBoxLayout, QLabel
except ImportError:
    from PySide2.QtCore import QResource
    from PySide2.QtGui import QPixmap, QMovie
    from PySide2.QtWidgets import QWidget, QApplication, QHBoxLayout, QLabel

from Lib.xpmres import image_head  # @UnresolvedImport


class ImageView(QWidget):

    def __init__(self, *args, **kwargs):
        super(ImageView, self).__init__(*args, **kwargs)
        self.resize(800, 600)
        layout = QHBoxLayout(self)

        # 从文件加载图片
        layout.addWidget(QLabel(self, pixmap=QPixmap("Data/head.jpg")))

        # QResource 参考 http://doc.qt.io/qt-5/resources.html

        # 从资源文件中加载1  from py file
        # 转换命令pyrcc5 res.qrc -o res_rc.py
        # 这种方式是从通过pyrcc5转换res.qrc为res_rc.py文件，可以直接import加载
        # 此时可以通过路径:/images/head.jpg来访问
        layout.addWidget(QLabel(self, pixmap=QPixmap(":/images/head.jpg")))

        # 从二进制资源文件res.rcc中加载
        # 转换命令tools/rcc.exe -binary res2.qrc -o res.rcc
        # 这里把资源前缀修改下(/myfile),见res2.qrc文件
        # 此时需要注册
        QResource.registerResource("Data/res.rcc")
        # 注意前缀
        layout.addWidget(
            QLabel(self, pixmap=QPixmap(":/myfile/images/head.jpg")))

        # 从xpm数组中加载
        # 通过工具tools/Image2XPM.exe来转换
        # 这里把转换的xpm数组直接放到py文件中当做一个变量
        # 见xpmres.py中的image_head
        layout.addWidget(QLabel(self, pixmap=QPixmap(image_head)))

        # 加载gif图片
        movie = QMovie("Data/loading.gif")
        label = QLabel(self)
        label.setMovie(movie)
        layout.addWidget(label)
        movie.start()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = ImageView()
    w.show()
    sys.exit(app.exec_())