1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
import sys
import time
from PyQt5.QtWidgets import QWidget, QApplication, QLabel, QGraphicsView, QGraphicsScene,QPushButton, QVBoxLayout, QGraphicsLineItem
from PyQt5.QtGui import QPainter, QColor, QFont, QPen
from PyQt5.QtCore import Qt, QRectF, QPointF, QLineF
class Window(QWidget):
def __init__(self):
super().__init__()
self.View = ViewDT(self)
self.button = QPushButton('Clear', self)
self.button.clicked.connect(self.handleClearView)
layout = QVBoxLayout(self)
layout.addWidget(self.View)
layout.addWidget(self.button)
def handleClearView(self):
self.View.scene().clear()
class ViewDT(QGraphicsView):
def __init__(self,parent):
QGraphicsView.__init__(self,parent)
self.setScene(QGraphicsScene(self))
self.setSceneRect(QRectF(self.viewport().rect()))
self.test = False
self.start = 0
self.end = 0
def mousePressEvent(self,event):
self.test = True
self.__start = event.pos()
self.start = QPointF(self.mapToScene(event.pos()))
def mouseMoveEvent(self,event):
self.end = QPointF(self.mapToScene(event.pos()))
if self.start != self.end and self.test is True:
self.scene().addItem(QGraphicsLineItem(QLineF(self.start,self.end)))
self.start = self.end
def mouseReleaseEvent(self, event):
self.test = False
if __name__ == '__main__':
app = QApplication(sys.argv)
window = Window()
window.resize(640, 480)
window.show()
sys.exit(app.exec_())