本文介紹了如何在 PyQt5 中通過拖放來繪制矩形并調整其形狀的處理方法,對大家解決問題具有一定的參考價值,需要的朋友們下面隨著小編來一起學習吧!
問題描述
我正在嘗試通過拖放在 PyQt5 創建的 GUI 上繪制一個矩形.我設法做到了,但是釋放鼠標左鍵時會繪制矩形.
I'm trying to draw a rectangle on GUI created by PyQt5 by drag and drop. I managed to do that, but the rectangle is drawn when the mouse left key is released.
我想做的就是這樣link:
- 按下鼠標左鍵時,開始繪制矩形.
- 拖動時,通過鼠標移動調整矩形形狀.
- 松開鼠標左鍵后,確定矩形形狀.
我該如何實現呢?提前致謝.
How can I implement this? Thanks in advance.
這是我的代碼.
# -*- coding: utf-8 -*-
import sys
from PyQt5 import QtWidgets, QtCore
from PyQt5.QtGui import QPainter
class MyWidget(QtWidgets.QWidget):
def __init__(self):
super().__init__()
self.setGeometry(30,30,600,400)
self.pos1 = [0,0]
self.pos2 = [0,0]
self.show()
def paintEvent(self, event):
width = self.pos2[0]-self.pos1[0]
height = self.pos2[1] - self.pos1[1]
qp = QPainter()
qp.begin(self)
qp.drawRect(self.pos1[0], self.pos1[1], width, height)
qp.end()
def mousePressEvent(self, event):
self.pos1[0], self.pos1[1] = event.pos().x(), event.pos().y()
print("clicked")
def mouseReleaseEvent(self, event):
self.pos2[0], self.pos2[1] = event.pos().x(), event.pos().y()
print("released")
self.update()
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
window = MyWidget()
window.show()
app.aboutToQuit.connect(app.deleteLater)
sys.exit(app.exec_())
推薦答案
你不必使用mouseReleaseEvent
函數,而是每次調用的mouseMoveEvent
函數鼠標移動了,我修改了代碼讓它更簡單.
You do not have to use the mouseReleaseEvent
function, but the mouseMoveEvent
function that is called each time the mouse is moved, and I have modified the code to make it simpler.
class MyWidget(QtWidgets.QWidget):
def __init__(self):
super().__init__()
self.setGeometry(30,30,600,400)
self.begin = QtCore.QPoint()
self.end = QtCore.QPoint()
self.show()
def paintEvent(self, event):
qp = QtGui.QPainter(self)
br = QtGui.QBrush(QtGui.QColor(100, 10, 10, 40))
qp.setBrush(br)
qp.drawRect(QtCore.QRect(self.begin, self.end))
def mousePressEvent(self, event):
self.begin = event.pos()
self.end = event.pos()
self.update()
def mouseMoveEvent(self, event):
self.end = event.pos()
self.update()
def mouseReleaseEvent(self, event):
self.begin = event.pos()
self.end = event.pos()
self.update()
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