Question

我有一个“工作”的例子，但我似乎无法弄清楚一些问题。我计算了橡皮筋内的topLeft和bottomRight坐标，并将它们转换为小部件坐标。但是pixmap.copy（）不会复制那些坐标。移动的全局和小部件坐标系统令人困惑，所以我假设我没有正确理解坐标系。

import sys
from PyQt5.QtCore import Qt, QRect
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QRubberBand
from PyQt5.QtWidgets import QHBoxLayout, QSizeGrip
from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(526, 478)
        self.centralWidget = QtWidgets.QWidget(MainWindow)
        self.centralWidget.setObjectName("centralWidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralWidget)
        self.gridLayout.setContentsMargins(11, 11, 11, 11)
        self.gridLayout.setSpacing(6)
        self.gridLayout.setObjectName("gridLayout")
        self.label = QtWidgets.QLabel(self.centralWidget)
        self.label.setText("")
        self.label.setPixmap(QtGui.QPixmap("ava.jpg"))
        self.label.setScaledContents(True)
        self.label.setObjectName("label")
        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
        self.pushButton = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton.setObjectName("pushButton")
        self.gridLayout.addWidget(self.pushButton, 1, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralWidget)
        self.menuBar = QtWidgets.QMenuBar(MainWindow)
        self.menuBar.setGeometry(QtCore.QRect(0, 0, 526, 25))
        self.menuBar.setObjectName("menuBar")
        MainWindow.setMenuBar(self.menuBar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Resizeable QLabel Example"))
        self.pushButton.setText(_translate("MainWindow", "Crop"))


class Test_Resize(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super(Test_Resize, self).__init__()
        self.setupUi(self)
        self.show()

    def run(self):
        self.pushButton.clicked.connect(self.cropImage)
        self.band = Resizable_rubber_band(self.label)
        self.band.move(50, 50)
        self.band.resize(200, 266)
        self.band.setMinimumSize(30, 30)

    def cropImage(self):
        rect = self.band.getCoverage()
        # copy(QRect( x, y, width, height))
        self.label.setPixmap(self.label.pixmap().copy(rect))
        self.label.repaint()


class Resizable_rubber_band(QWidget):
    def __init__(self, parent=None):
        super(Resizable_rubber_band, self).__init__(parent)
        # tell QSizeGrip to resize this widget instead of top-level window
        self.setWindowFlags(Qt.SubWindow)
        self.layout = QHBoxLayout(self)
        self.layout.setContentsMargins(0, 0, 0, 0)
        self.grip1 = QSizeGrip(self)
        self.grip2 = QSizeGrip(self)
        self.layout.addWidget(self.grip1, 0, Qt.AlignLeft | Qt.AlignTop)
        self.layout.addWidget(self.grip2, 0, Qt.AlignRight | Qt.AlignBottom)
        self.rubberband = QRubberBand(QRubberBand.Rectangle, self)
        self.rubberband.move(0, 0)
        self.rubberband.show()
        self.show()

    def resizeEvent(self, event):
        # force 4h x 3w aspect ratio using QSize
        # if width < height: height = 1.333 * width
        # if width > height: width = height / 1.333
        # width = self.width()
        # height = self.height()
        # if(width < height):
        #     height = int(width * 1.333)
        # else:
        #     width = int(height / 1.333)
        # self.rubberband.resize(QSize(width, height))
        self.rubberband.resize(self.size())

    def getCoverage(self):
        localCoords = self.contentsRect()
        print("localCoords: ", localCoords)
        TL = self.mapToGlobal(localCoords.topLeft())
        BR = localCoords.bottomRight()
        # TL+BR to get width & height
        widgetCoords = QRect(TL, TL+BR)
        print("widgetCoords: ", widgetCoords)
        return widgetCoords


app = QApplication(sys.argv)
program = Test_Resize()
program.run()
sys.exit(app.exec_())

Answer 1

启用scaledContents属性时：

<?php
$url = "https://api.binance.com/api/v1/ticker/allPrices";
$content = file_get_contents($url);
$json_data = json_decode($content, true);

for ($i=0; $i < count($json_data); $i++) {
    echo $json_data[$i]['symbol'] . "\n";
}
?>

self.label.setScaledContents(True)的坐标与QPixmap的像素不对应，例如，让我们说QLabel是20乘20和{{1}然后它必须在像素图的高度从20变换到10。

要做的第一件事是将全局坐标转换为QPixmap坐标QLabel，然后通过缩放与初始更改成比例的宽度和高度来变换矩形。

QLabel

QPixmap＆amp; QRubberBand缩放麻烦

1 个答案: