PyQT6 (4)QGraphicsView 显示图片

GraphicsView使用

from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtWidgets import QGraphicsPixmapItem, QGraphicsScene
 
def showImage(self):
 
    frame = QImage("img/entrance1.png")
    pix = QPixmap.fromImage(frame)
    item = QGraphicsPixmapItem(pix)
    scene = QGraphicsScene()
    scene.addItem(item)
    self.graphicsView.setScene(scene)

QGraphicsScene使用

class SeisPro(QtWidgets.QMainWindow, Ui_SeismicProgramme):
    def __init__(self, parent=None):
        super(SeisPro, self).__init__(parent)
        # 设置窗体
        self.setupUi(self)

        # 输入框默认值设置
        self.time_txt.setPlainText("0")
        self.velocity_txt.setPlainText("0")
        self.distance_txt.setPlainText("0")
        # 0. 绘图控件，创建一个QGraphicsScene
        self.velocity_view.setScene(QGraphicsScene())
        # 按钮
        self.oky_btn.clicked.connect(self.oky_btn_func)
        self.cancel_btn.clicked.connect(self.cancel_btn_fnc)

# 查询数据

    def oky_btn_func(self):
        self.distance_txt.setPlainText("1")
        self.add_velocitypic()
        # self.add_distancepic()
        self.plt_distancepic()

def plt_distancepic(self):
        # 1. 创建场景
        scene = QGraphicsScene() 
        # 2. 绘制内容 
        # Draw a rectangle item, setting the dimensions.
        rect = QGraphicsRectItem(0, 0, 200, 50)
        # Set the origin (position) of the rectangle in the scene.
        rect.setPos(50, 20)
        # Define the brush (fill).
        brush = QBrush(Qt.GlobalColor.red)
        rect.setBrush(brush)
        # Define the pen (line)
        pen = QPen(Qt.GlobalColor.cyan)
        pen.setWidth(10)
        rect.setPen(pen)
        # 3. 加载内容到场景中
        scene.addItem(rect)
        # 4. 将场景添加至视图
        self.distance_view.setScene(scene)

QGraphics框架简介 - 使用QGraphics视图框架创建矢量界面 - 掘金

Qt图形视图框架允许你开发_快速_ _有效的_2D矢量图形场景。场景可以包含_数百万个_项目，每个项目都有自己的特征和行为。通过PyQt使用图形视图，你可以在Python中访问这个高性能的图形层。无论

https://juejin.cn/post/7086754603429003277

示例

class SeisPro(QtWidgets.QMainWindow, Ui_SeismicProgramme):
    def __init__(self, parent=None):
        super(SeisPro, self).__init__(parent)
        # 设置窗体
        self.setupUi(self)

        # 输入框默认值设置
        self.timeLineEdit.setText('0')
        # self.timeLineEdit.setPlainText("0")
        self.velocityLineEdit.setText("0")
        self.distanceLineEdit.setText("0")
        # 绘图控件，创建一个QGraphicsScene
        self.velocity_view.setScene(QGraphicsScene())
        # 按钮
        self.oky_btn.clicked.connect(self.oky_btn_func)
        self.cancel_btn.clicked.connect(self.cancel_btn_fnc)

def add_velocitypic(self):
        frame = QImage("person.jpg")
        pix = QPixmap.fromImage(frame)
        pix = pix.scaled(200, 260)   # 调整图片大小為 200x260
        item = QGraphicsPixmapItem(pix)
        scene = QGraphicsScene()
        # QGraphicsScene 相對位置 (20, 20) 和大小 200x260
        scene.setSceneRect(0, 0, 200, 260)

        scene.addItem(item)
        self.velocity_view.setScene(scene)

图片自适应窗口的大小

• 这样存在窗口最大化时，图片不变化

class SeisPro(QtWidgets.QMainWindow, Ui_SeismicProgramme):
    def __init__(self, parent=None):
        super(SeisPro, self).__init__(parent)
        # 设置窗体
        self.setupUi(self)

        # 输入框默认值设置
        self.timeLineEdit.setText('0')
        # self.timeLineEdit.setPlainText("0")
        self.velocityLineEdit.setText("0")
        self.distanceLineEdit.setText("0")
        # 绘图控件，创建一个QGraphicsScene
        self.velocity_view.setScene(QGraphicsScene())
        self.distance_view.setScene(QGraphicsScene())
        # 按钮
        self.oky_btn.clicked.connect(self.oky_btn_func)
        self.cancel_btn.clicked.connect(self.cancel_btn_fnc)

    def oky_btn_func(self):  # 查询数据
        self.distanceLineEdit.setText("1")
        self.add_velocitypic()
        self.add_distancepic()

    def contour_fnc(self, x, y): # 绘制等值线函数
        return (1 - y**5 + x**5) * np.exp(-x**2 - y**2)

    def add_velocitypic(self):  # 加载速度图形
        frame = QImage("person.jpg")
        pix = QPixmap.fromImage(frame)
        width = self.velocity_view.width()
        height = self.velocity_view.height()
        # print(width,height)
        pix = pix.scaled(width, height)   # 调整图片大小為 200x260
        item = QGraphicsPixmapItem(pix)
        scene = QGraphicsScene()
        # QGraphicsScene 相對位置 (20, 20) 和大小 200x260
        scene.setSceneRect(0, 0, width, height) #设置原点和scene大小

        scene.addItem(item)
        self.velocity_view.setScene(scene)

def main():
    app = QApplication(sys.argv)
    pr = SeisPro()
    pr.show()
    app.exec()


if __name__ == '__main__':
    main()

'''
Description: henggao_note
version: v1.0.0
Date: 2023-06-19 20:34:33
LastEditors: henggao
LastEditTime: 2023-06-26 08:49:25
'''
import sys

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt,QRectF
from PyQt5.QtGui import (QBrush, QColor, QImage, QPainter, QPainterPath, QPen,
                         QPixmap)
from PyQt5.QtWidgets import (QApplication, QDialog, QGraphicsPixmapItem,
                             QGraphicsRectItem, QGraphicsScene, QGraphicsView)

from Ui_SeismicPro import Ui_SeismicProgramme


class SeisPro(QtWidgets.QMainWindow, Ui_SeismicProgramme):
    def __init__(self, parent=None):
        super(SeisPro, self).__init__(parent)
        # 设置窗体
        self.setupUi(self)

        # 输入框默认值设置
        self.timeLineEdit.setText('0')
        # self.timeLineEdit.setPlainText("0")
        self.velocityLineEdit.setText("0")
        self.distanceLineEdit.setText("0")
        # 绘图控件，创建一个QGraphicsScene
        self.velocity_view.setScene(QGraphicsScene())
        self.distance_view.setScene(QGraphicsScene())
        # 按钮
        self.oky_btn.clicked.connect(self.oky_btn_func)
        self.cancel_btn.clicked.connect(self.cancel_btn_fnc)

    def oky_btn_func(self):  # 查询数据
        self.distanceLineEdit.setText("1")
        self.add_velocitypic()
        self.add_distancepic()

    def contour_fnc(self, x, y): # 绘制等值线函数
        return (1 - y**5 + x**5) * np.exp(-x**2 - y**2)

    def add_velocitypic(self):  # 加载速度图形
        frame = QImage("person.jpg")
        pix = QPixmap.fromImage(frame)
        width = self.velocity_view.width()
        height = self.velocity_view.height()
        # print(width,height)
        pix = pix.scaled(width, height)   # 调整图片大小為 200x260
        item = QGraphicsPixmapItem(pix)
        scene = QGraphicsScene()
        # QGraphicsScene 相對位置 (20, 20) 和大小 200x260
        scene.setSceneRect(0, 0, width, height) #设置原点和scene大小

        scene.addItem(item)
        self.velocity_view.setScene(scene)

    def add_distancepic(self):  # 加载DIstance图形
        frame = QImage("ttt2022831.jpg")
        # pix = QPixmap.fromImage(frame)
        # pix = pix.scaled(200, 260)   # 调整图片大小為 200x260
        # item = QGraphicsPixmapItem(pix)
        # scene = QGraphicsScene()
        # # QGraphicsScene 相對位置 (20, 20) 和大小 200x260
        # scene.setSceneRect(0, 0, 200, 260) #设置原点和scene大小
        pix = QPixmap.fromImage(frame)
        width = self.velocity_view.width()
        height = self.velocity_view.height()
        # print(width,height)
        pix = pix.scaled(width, height)   # 调整图片大小為 200x260
        item = QGraphicsPixmapItem(pix)
        scene = QGraphicsScene()
        # QGraphicsScene 相對位置 (20, 20) 和大小 200x260
        scene.setSceneRect(0, 0, width, height) #设置原点和scene大小

        scene.addItem(item)
        self.distance_view.setScene(scene)

    def resizeEvent(self, event): # 最大化窗口进行变化
        super().resizeEvent(event)
        self.add_velocitypic()
        self.add_distancepic()
       

    def cancel_btn_fnc(self):    # 退出按钮
        print("退出程序")
        sys.exit()

    

def main():
    app = QApplication(sys.argv)
    pr = SeisPro()
    pr.show()
    app.exec()


if __name__ == '__main__':
    main()