This article is categorized as "Garbage" . It should NEVER be appeared in your search engine's results.使用chatgpt 4
chatgpt 3.5一直没能成功get到我想要表达的重点在于 Retina，模糊 ，我试了好几个对话都没能拿到好用的代码。
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严重的遗留问题
2023年6月，在准备发表这篇笔记前我又跑了一遍程序，突然发现一个很严重的问题：
相比于tkinter展示图片的程序，pyqt部分场景更清晰，部分场景更模糊，懒得分析具体原因了。不想搞了。
并且，目前我试过的所有图片里，pyqt的清晰度永远被preview.app压一头。
为什么会有这篇笔记
最初的原因
因为macOS的Retina屏幕，我发现tkinter展示某些图片莫名其妙的不清晰。
突然就出问题了
到了即将发这篇笔记的时候，我手痒了，找了2张chrome截图试了下程序，结果发现我的pyqt6不知怎么回事，比tkinter还要糊（当然，tkinter还是比不过preview.app）：
代码1：展示1张图片
使用pyqt6，在macOS Retina屏幕下仍然表现良好的代码（这里缩放了图片，让图片显示在左半部分）
懒得让chatgpt帮我写获取屏幕大小的代码了，这里写死了 screen_width = 2560 .
只测试了“高度>宽度“的长图（从pdf里面搞出来的图），没有测试其他尺寸类型的图。
如果需要修改图片位置，则可以修改 view.setAlignment(Qt.AlignmentFlag.AlignLeft)
如果需要修改屏幕为fullscreen，则可以修改 self.showMaximized()
chatgpt给出的代码里zoom_percentage还是大了一倍，所以zoom_percentage被我多除了一个2
import sys
from PyQt6 import QtGui
from PyQt6.QtCore import Qt, QSize
from PyQt6.QtGui import QImageReader, QPixmap, QIcon
from PyQt6.QtWidgets import QApplication, QGraphicsScene, QGraphicsView, QMainWindow, QVBoxLayout, QWidget
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
# Set window title and icon
self.setWindowTitle('png Viewer')
# self.setWindowIcon(QIcon(':/path/to/your/icon.png'))
# Load PBM image
image_file = './path/1.png'
image_reader = QImageReader(image_file)
image = image_reader.read()
# Get image size
image_size = image.size()
print(f'Image size: {image_size.width()}x{image_size.height()}')
# Calculate zoom percentage
screen_width = 2560
zoom_percentage = (screen_width / 2) / image_size.width() / 2
# chatgpt给出的代码里zoom_percentage还是大了一倍，所以zoom_percentage被我多除了一个2
print(f'Zoom percentage: {zoom_percentage * 100}%')
# Display image
scene = QGraphicsScene()
pixmap = QPixmap.fromImage(image)
pixmap = pixmap.scaled(image_size * zoom_percentage, Qt.AspectRatioMode.KeepAspectRatio,
Qt.TransformationMode.SmoothTransformation)
scene.addPixmap(pixmap)
view = QGraphicsView(scene)
view.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing)
view.setViewportUpdateMode(QGraphicsView.ViewportUpdateMode.FullViewportUpdate)
view.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
view.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
view.setAlignment(Qt.AlignmentFlag.AlignLeft)
central_widget = QWidget()
layout = QVBoxLayout()
layout.addWidget(view)
central_widget.setLayout(layout)
self.setCentralWidget(central_widget)
# Set the main window to full screen
self.showMaximized()
if __name__ == '__main__':
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec())
代码2：展示2张图片
一段能够接受2个参数，分别左右显示图片的pyqt6程序，左边的图尽可能占用左半边屏幕，右边的图尽可能占用右半边屏幕，基于上面的程序略微修改而来：
代码里有个0.95是我加的，因为self.showMaximized()会留出顶部的title框
暂时写死了2张图片的路径
import sys
from PyQt6 import QtGui
from PyQt6.QtCore import Qt, QSize
from PyQt6.QtGui import QImageReader, QPixmap, QIcon
from PyQt6.QtWidgets import QApplication, QGraphicsScene, QGraphicsView, QMainWindow, QHBoxLayout, QWidget
class MainWindow(QMainWindow):
def __init__(self, image1_path, image2_path):
super().__init__()
# Set window title and icon
self.setWindowTitle('PBM Viewer')
# self.setWindowIcon(QIcon(':/path/to/your/icon.png'))
# Load images
image1 = QImageReader(image1_path).read()
image2 = QImageReader(image2_path).read()
# Calculate zoom percentage
screen_width = 2560
zoom_percentage1 = (screen_width / 2) / image1.width() / 2 * 0.95
zoom_percentage2 = (screen_width / 2) / image2.width() / 2 * 0.95
# 这个0.95是我加的，因为self.showMaximized()会留出顶部的title框
# Create scenes
scene1 = QGraphicsScene()
pixmap1 = QPixmap.fromImage(image1).scaled(image1.size() * zoom_percentage1, Qt.AspectRatioMode.KeepAspectRatio,
Qt.TransformationMode.SmoothTransformation)
scene1.addPixmap(pixmap1)
scene2 = QGraphicsScene()
pixmap2 = QPixmap.fromImage(image2).scaled(image2.size() * zoom_percentage2, Qt.AspectRatioMode.KeepAspectRatio,
Qt.TransformationMode.SmoothTransformation)
scene2.addPixmap(pixmap2)
# Create views
view1 = QGraphicsView(scene1)
view2 = QGraphicsView(scene2)
for view in (view1, view2):
view.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing)
view.setViewportUpdateMode(QGraphicsView.ViewportUpdateMode.FullViewportUpdate)
view.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
view.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
view.setAlignment(Qt.AlignmentFlag.AlignLeft)
# Set up layout
central_widget = QWidget()
layout = QHBoxLayout()
layout.addWidget(view1)
layout.addWidget(view2)
central_widget.setLayout(layout)
self.setCentralWidget(central_widget)
# Set the main window to full screen
self.showMaximized()
if __name__ == '__main__':
app = QApplication(sys.argv)
# if len(sys.argv) < 3:
# print('Usage: python <script_name> <image1_path> <image2_path>')
# sys.exit(1)
image1_path = "./1.png"
image2_path = "./2.png"
window = MainWindow(image1_path, image2_path)
window.show()
sys.exit(app.exec())
代码3：动态更新展示的2张图片
假定我们正在运行上面的代码展示图片，但我们另一个进程（可能是python进程，也可能是其他语言写的进程）需要动态更新pyqt程序展示的2张图片。
注意：下面的代码懒得优化了，因为我目前就只会用监控文件的方法来更新图片，所以就暂时这么将就用了
注意：下面的代码是从项目里搬出来的，有些 参数/变量 是写死的，注意！
注意：需要准备这些文件和文件夹：
python运行文件：2个， test_pyqt.py 和 pyqt_controller.py
图片文件夹： ./images/ ，写死在代码里了
蓝色过渡图片：浅蓝色的过渡图片 ./images/blue.png
其他展示图片：初始化的2张图片为 ./images/1.png 和 ./images/2.png
监控文件： ./monitor_images.txt
文件1： test_pyqt.py
# Save this as test_pyqt.py
import sys
from PyQt6 import QtGui
from PyQt6.QtCore import Qt, QSize
from PyQt6.QtGui import QImageReader, QPixmap, QIcon
from PyQt6.QtWidgets import QApplication, QGraphicsScene, QGraphicsView, QMainWindow, QHBoxLayout, QWidget
class MainWindow(QMainWindow):
def __init__(self, image1_path, image2_path):
super().__init__()
# Set window title and icon
self.setWindowTitle('PBM Viewer')
# self.setWindowIcon(QIcon(':/path/to/your/icon.png'))
# Load images
image1 = QImageReader(image1_path).read()
image2 = QImageReader(image2_path).read()
# Calculate zoom percentage
screen_width = 2560
self.zoom_percentage1 = (screen_width / 2) / image1.width() / 2 * 0.95
self.zoom_percentage2 = (screen_width / 2) / image2.width() / 2 * 0.95
# Create scenes
scene1 = QGraphicsScene()
pixmap1 = QPixmap.fromImage(image1).scaled(image1.size() * self.zoom_percentage1, Qt.AspectRatioMode.KeepAspectRatio,
Qt.TransformationMode.SmoothTransformation)
scene1.addPixmap(pixmap1)
scene2 = QGraphicsScene()
pixmap2 = QPixmap.fromImage(image2).scaled(image2.size() * self.zoom_percentage2, Qt.AspectRatioMode.KeepAspectRatio,
Qt.TransformationMode.SmoothTransformation)
scene2.addPixmap(pixmap2)
# Create views
self.view1 = QGraphicsView(scene1)
self.view2 = QGraphicsView(scene2)
for view in (self.view1, self.view2):
view.setRenderHint(QtGui.QPainter.RenderHint.Antialiasing)
view.setViewportUpdateMode(QGraphicsView.ViewportUpdateMode.FullViewportUpdate)
view.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
view.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
view.setAlignment(Qt.AlignmentFlag.AlignLeft)
# Set up layout
central_widget = QWidget()
layout = QHBoxLayout()
layout.addWidget(self.view1)
layout.addWidget(self.view2)
central_widget.setLayout(layout)
self.setCentralWidget(central_widget)
# Set the main window to full screen
self.showMaximized()
def update_images(self, image1_path, image2_path):
# Load images
image1 = QImageReader(image1_path).read()
image2 = QImageReader(image2_path).read()
# Update views
pixmap1 = QPixmap.fromImage(image1).scaled(image1.size() * self.zoom_percentage1,
Qt.AspectRatioMode.KeepAspectRatio,
Qt.TransformationMode.SmoothTransformation)
pixmap2 = QPixmap.fromImage(image2).scaled(image2.size() * self.zoom_percentage2,
Qt.AspectRatioMode.KeepAspectRatio,
Qt.TransformationMode.SmoothTransformation)
self.view1.scene().clear()
self.view1.scene().addPixmap(pixmap1)
self.view2.scene().clear()
self.view2.scene().addPixmap(pixmap2)
def run(image1_path, image2_path):
app = QApplication(sys.argv)
window = MainWindow(image1_path, image2_path)
window.show()
return app, window
def start_app(app):
sys.exit(app.exec())
文件2： pyqt_controller.py
# Save this as pyqt_controller.py
import test_pyqt
from PyQt6.QtCore import QTimer
import sys
def read_image_paths_from_file(file_path):
try:
with open(file_path, 'r') as file:
image1_path = file.readline().strip()
image2_path = file.readline().strip()
return image1_path, image2_path
except Exception as e:
print(f'Error reading image paths: {e}')
return None, None
def update_images_periodically():
global last_image1_path, last_image2_path, blue
image1_path, image2_path = read_image_paths_from_file('monitor_images.txt')
if blue:
if image1_path and image2_path and (image1_path != last_image1_path) and (image2_path != last_image2_path):
# print('更新两边blue')
window.update_images('./images/blue.png', './images/blue.png')
blue = False
elif image1_path and image2_path and (image1_path != last_image1_path):
# print('更新左边blue')
window.update_images('./images/blue.png', image2_path)
blue = False
elif image1_path and image2_path and (image2_path != last_image2_path):
# print('更新右边blue')
window.update_images(image1_path, './images/blue.png')
blue = False
else:
if image1_path and image2_path and (image1_path != last_image1_path or image2_path != last_image2_path):
window.update_images(image1_path, image2_path)
last_image1_path = image1_path
last_image2_path = image2_path
blue = True
if __name__ == "__main__":
initial_image1_path = './images/image1.png'
initial_image2_path = './images/image2.png'
blue = True
import os
os.system("echo ''> ./monitor_images.txt")
app, window = test_pyqt.run(initial_image1_path, initial_image2_path)
last_image1_path, last_image2_path = initial_image1_path, initial_image2_path
timer = QTimer()
timer.timeout.connect(update_images_periodically)
timer.start(1000) # Check for updates every 1 second
test_pyqt.start_app(app)
运行方法：
$ python3 pyqt_controller.py此时会展示2张初始图片image1.png和image2.png
需要更新图片的时候，另一个进程对 monitor_images.txt 文件进行修改，修改第1行为 新图片a的路径 ，修改第2行为 新图片b的路径 ，比如：
./images/image3.png
./images/image4.png代码里的pyqt监控函数QTimer()就会监控到文件变化（每隔1秒扫描文件 monitor_images.txt ），如果有更新就会更新。
更新的时候会根据具体情况选择短暂的蓝色幕布（过渡），比如：
从 image1-image2 切换到 image3-image4 ：左右都有蓝色幕布过渡
从 image1-image2 切换到 image3-image2 ：只有左边有蓝色幕布过渡
从 image1-image2 切换到 image1-image3 ：只有右边有蓝色幕布过渡
另一个补充：由于上面的代码是从现有项目里抠出来的，这段代码是新增加的：
