如何使用 pixmap 将图像添加到 QGraphicsScene 类中

Question

在这里，我在 Q 图形场景类中创建了一个网格，我想在网格中的每个单元格中添加一个图像，所以请你帮帮我。如何在网格的每个单元格中添加图像

class QS(QtGui.QGraphicsScene):
        def __init__(self, *args, **kwargs):
        super(QS, self).__init__(*args, **kwargs)

        # self.grview = QtGui.QGraphicsView()
        self.scene = QtGui.QGraphicsScene()
        self.scene.addPixmap(QtGui.QPixmap('pradeep.jpg'))
        self.grview.setScene(self.scene)



        print "Inserted in QS col = {}, row = {}".format(X,Y)

        width = X * Setting.WIDTH
        height = Y * Setting.HEIGHT
        self.setSceneRect(0, 0, width, height)

        self.setItemIndexMethod(QtGui.QGraphicsScene.NoIndex)

        for x in range(0,X+1):
            xc = x * Setting.WIDTH
            self.addLine(xc,0,xc,height)
            self.scene.addPixmap(QtGui.QPixmap('pradeep.jpg'))
            # self.addPixmap(self.pixmap)


        for y in range(0,Y+1):
            yc = y * Setting.HEIGHT
            self.addLine(0,yc,width,yc)
            self.scene.addPixmap(QtGui.QPixmap('pradeep.jpg'))
            # self.addPixmap(self.pixmap)

        # for x in range(0,X+1):
        #     for y in range(0,Y+1):
        #         self.addPixmap(0,y,imag)

class QV(QtGui.QGraphicsView, QtGui.QMainWindow):

    def __init__(self, *args, **kwargs):
        super(QV, self).__init__(*args, **kwargs)

我的网格图像如下所示

Answer 1

您的问题可以有多种解释，所以我将展示几个选项：

1. 如果您不打算与项目进行交互，例如您不想移动、选择、旋转等，则不需要使用项目，在这种情况下最好使用drawBackground()，因为一个项目比一个简单的绘制消耗更多的资源。

import sys
from PyQt4 import QtCore, QtGui


class Setting:
    WIDTH = 80
    HEIGHT = 80

X, Y = 7, 5


class QS(QtGui.QGraphicsScene):
    def __init__(self, parent=None):
        super(QS, self).__init__(QtCore.QRectF(0, 0, X * Setting.WIDTH, Y * Setting.HEIGHT), parent)

    def drawBackground(self, painter, rect):
        width = X * Setting.WIDTH
        height = Y * Setting.HEIGHT

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(width, 0))
        for _ in range(Y+1):
            painter.drawLine(l)
            l.translate(0, Setting.HEIGHT)

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(0, height))
        for _ in range(X+1):
            painter.drawLine(l)
            l.translate(Setting.WIDTH, 0)

        pixmap = QtGui.QPixmap("pradeep.png").scaled(Setting.WIDTH, 
            Setting.HEIGHT, 
            QtCore.Qt.IgnoreAspectRatio,
            QtCore.Qt.SmoothTransformation)

        p = QtCore.QPointF()
        for i in range(X):
            p = QtCore.QPointF(Setting.WIDTH*i, 0)
            for j in range(Y):
                painter.drawPixmap(p, pixmap)
                p += QtCore.QPointF(0, Setting.HEIGHT)


class QV(QtGui.QGraphicsView):
    pass


class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        scene = QS(self)
        view = QV(scene)
        self.setCentralWidget(view)


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

2.如果您想与图像进行交互，您可以使用QGraphicsPixmapItem，或两者的组合：

import sys
from PyQt4 import QtCore, QtGui


class Setting:
    WIDTH = 80
    HEIGHT = 80

X, Y = 7, 5


class QS(QtGui.QGraphicsScene):
    def __init__(self, parent=None):
        super(QS, self).__init__(QtCore.QRectF(0, 0, X * Setting.WIDTH, Y * Setting.HEIGHT), parent)

        pixmap = QtGui.QPixmap("pradeep.png").scaled(Setting.WIDTH, 
            Setting.HEIGHT, 
            QtCore.Qt.IgnoreAspectRatio,
            QtCore.Qt.SmoothTransformation)

        p = QtCore.QPointF()
        for i in range(X):
            p = QtCore.QPointF(Setting.WIDTH*i, 0)
            for j in range(Y):
                it = self.addPixmap(pixmap)
                it.setPos(p)
                p += QtCore.QPointF(0, Setting.HEIGHT)

    def drawBackground(self, painter, rect):
        width = X * Setting.WIDTH
        height = Y * Setting.HEIGHT

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(width, 0))
        for _ in range(Y+1):
            painter.drawLine(l)
            l.translate(0, Setting.HEIGHT)

        l = QtCore.QLineF(QtCore.QPointF(0, 0), QtCore.QPointF(0, height))
        for _ in range(X+1):
            painter.drawLine(l)
            l.translate(Setting.WIDTH, 0)


class QV(QtGui.QGraphicsView):
    pass


class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        scene = QS(self)
        view = QV(scene)
        self.setCentralWidget(view)


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