先上代碼，主要看鼠標(biāo)移動事件里面代碼

import sys
from PyQt5 import QtCore
from PyQt5.QtCore import Qt, QPoint
from PyQt5.QtGui import QPainter, QPen, QPixmap, QPainterPath, QFont, QColor, QBrush
from PyQt5.QtWidgets import QApplication, QWidget
import numpy as np


class DemoMouseEvent(QWidget):
    def __init__(self, parent=None):
        super(DemoMouseEvent, self).__init__(parent)
        # 設(shè)置窗口標(biāo)題
        self.setWindowTitle('鼠標(biāo)事件演示')
        # 設(shè)置窗口大小
        self.setFixedSize(480, 320)

        self.beginPoint = QPoint()  # 起始點(diǎn)
        self.endPoint = QPoint()  # 結(jié)束點(diǎn)

        self.pixmap = QPixmap('d:\\67.jpg')
        #self.pixmap.fill(Qt.lightGray)
        self.copt_pixmap =self.pixmap.copy()
        self.setMouseTracking(True)
        self.cur_x = 0
        self.cur_y = 0


    def draw(self, painter):
        path = QPainterPath()
        f = QFont('黑體', 10)
        point = QPoint(20, 20)
        path.addText(point, f, "世界您好")
        point1 = QPoint(250, 250)
        point2 = QPoint(self.cur_x, self.cur_y)
        path.moveTo(point)
        path.lineTo(point1)
        path.lineTo(point2)
        path.lineTo(point)
        #path.addEllipse(point, 5, 5)
        painter.fillPath(path, QColor(0, 255, 0, 128))
        painter.drawPath(path)

    # 重繪窗口事件
    def paintEvent(self, event):
        self.pixmap=self.copt_pixmap.copy()
        pp = QPainter(self.pixmap)
        pp.setPen(QPen(Qt.blue, 2))  # 設(shè)置畫筆
        self.draw(pp)
        # 繪制直線
        pp.drawLine(self.beginPoint, self.endPoint)
        # 上一直線的終點(diǎn)就是下一直線的起點(diǎn)
        self.beginPoint = self.endPoint

        # 在畫布上畫出
        painter = QPainter(self)
        painter.drawPixmap(0, 0, self.pixmap)


    def wheelEvent(self, ev):
        mods = ev.modifiers()
        # print('mods=', mods)
        delta = ev.angleDelta()
        # print('delta=', delta)
        if QtCore.Qt.ControlModifier == int(mods):
            if int(delta.y()) > 0:
                print("ctrl 向上滾輪")
            else:
                print("ctrl 向下滾輪")

    def mousePressEvent(self, event):
        # 鼠標(biāo)左鍵按下
        if event.button() == Qt.LeftButton:
            self.startPoint = event.pos()

    def mouseReleaseEvent(self, event):
        # 鼠標(biāo)左鍵釋放
        if event.button() == Qt.LeftButton:
            self.endPoint = event.pos()
            # 重新繪制
            self.update()

    def mouseMoveEvent(self, event):
        tmp1 = event.y()
        tmp2 = event.localPos().y()
        tmp3 = event.pos().y()
        tmp4 = event.windowPos().y()

        tmp5 = event.y() + self.y()
        
        tmp6 = event.screenPos().y()
        tmp7 = event.globalPos().y()
        print("所有點(diǎn)的位置:")
        print(tmp1)
        print(tmp2)
        print(tmp3)
        print(tmp4)
        print(tmp5)
        print(tmp6)
        print(tmp7)
        # 鼠標(biāo)左鍵按下的同時移動鼠標(biāo)
        if event.buttons() and Qt.LeftButton:
            self.endPoint = event.pos()
            # 重新繪制
            self.update()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = DemoMouseEvent()
    window.show()
    sys.exit(app.exec())

通過運(yùn)行代碼可以發(fā)現(xiàn)：

tmp1 = event.y()
tmp2 = event.localPos().y()
tmp3 = event.pos().y()
tmp4 = event.windowPos().y()
上面四個是相對于父控件的坐標(biāo)，搞編程都知道圖像坐標(biāo)是x軸是圖像上面，y軸是圖像左側(cè)


tmp5 = event.y() + self.y()
上面這個是相對于窗口坐標(biāo)
tmp6 = event.screenPos().y()
tmp7 = event.globalPos().y()?

上面這2行就是相當(dāng)于屏幕左上角坐標(biāo)了文章來源地址http://www.zghlxwxcb.cn/news/detail-551004.html

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