Pyqt5 实时图像滚动

实时图像

写了一个关于实时图像滚动显示的例子，做个记录。

滚动算法：

难点：

将内存数据绘制到界面，需要用到QImage和QPixmap，使用QImage转换一下，具体参见代码。这个费了好大劲才弄出来（网上的资料大都很简单，处理个QImage打开保存啊等等操作，项目实用性不强。）

from PIL import Image

import numpy as np

import threading

import time

class GraphicWidget(QWidget):

def __init__(self):

super(GraphicWidget,self).__init__()

self.threadStop = False

self.drawWidth = 1080

self.drawHeight = 800

self.imgWholeData = None

self.imgScreenData = np.zeros([self.drawHeight,self.drawWidth],np.uint8)

self.imgTotalLines = 0

self.imgWidth = 0

self.threadStop = True

pass

def doscroll(self):

if self.threadStop:

img = Image.open("d:/test2.png")

self.imgWholeData = np.array(img)

self.imgTotalLines, self.imgWidth = self.imgWholeData.shape

scrollThread = threading.Thread(target = self.scroll)

scrollThread.start()

def stop(self):

self.threadStop = True

def scroll(self):

step = 5

srcStartLine = 0

srcEndLine = step

destEndLine = step

self.threadStop = False

while not self.threadStop:

if destEndLine > self.drawHeight:

destEndLine = self.drawHeight

if srcEndLine > self.drawHeight:

srcStartLine = srcEndLine - self.drawHeight

if srcEndLine > self.imgTotalLines:

print("scroll end")

self.threadStop = True

break

if srcStartLine < self.drawHeight:

self.imgScreenData = np.zeros([self.drawHeight,self.drawWidth],np.uint8)

self.imgScreenData[0:destEndLine] = self.imgWholeData[srcStartLine:srcEndLine]

self.update()

destEndLine = destEndLine + step

srcEndLine = srcEndLine + step

time.sleep(0.005)

pass

def paintEvent(self,event):

try:

painter = QPainter()

destRect = QRect(0,0,self.drawWidth,self.drawHeight)

srcRect = QRect(0,0,self.drawWidth,self.drawHeight)

img = QImage(self.imgScreenData.data, self.drawWidth, self.drawHeight, QImage.Format_Indexed8)

pix = QPixmap.fromImage(img)

painter.begin(self)

painter.drawPixmap(destRect, pix, srcRect)

painter.end()

except Exception as e:

print(e)

raise

Pass

经验证，图像“拖尾”比较严重，图像滚动平滑效果比不上用DirectX做的效果，但是刷新效率很高，QT这块做的比C#好很多。

下次，实用Opengl做一个，看看效果咋样。