# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'Demo.ui'
#
# Created by: PyQt5 UI code generator 5.15.4
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again. Do not edit this file unless you know what you are doing.
import math
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt, QPoint, QPointF
from PyQt5.QtGui import QPainter, QPen, QPainterPath, QPolygonF, QColor, QPixmap
from PyQt5.QtWidgets import QApplication, QWidget, QFrame, QSizePolicy, QColorDialog, QHBoxLayout, QPushButton, \
QComboBox, QSpinBox, QFormLayout, QLabel
class MyLabel(QLabel):
def __init__(self, parent=None):
super(MyLabel, self).__init__(parent)
self.flag = None
self.setLineWidth(1)
self.setMidLineWidth(0)
self.setSizePolicy(QSizePolicy.Preferred, QSizePolicy.Preferred)
self.x0 = 0
self.y0 = 0
self.x1 = 0
self.y1 = 0
self.penColor = (QColor(255, 0, 0, 40))
self.lastpenColor = (QColor(255, 0, 0, 40))
self.penWidth = 30
self.penStyle = Qt.SolidLine
self.capStyle = Qt.RoundCap
def setPenColor(self, color):
self.lastpenColor = color
self.penColor = color
def setDrawStatus(self, status):
if status == True:
self.penColor = self.lastpenColor
elif status == False:
self.penColor = (QColor(0, 0, 0, 0))
def widthChange(self, value):
self.penWidth = value
def paintEvent(self, event):
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing, True)
# 绘制边框线
painter.drawRect(self.rect())
painter.setPen(QPen(self.penColor, self.penWidth, self.penStyle, self.capStyle))
painter.drawLine(self.x0, self.y0, self.x1, self.y1)
def mousePressEvent(self, event):
self.x1 = event.x()
self.y1 = event.y()
self.flag = True
def mouseMoveEvent(self, event):
if self.flag:
self.x0 = self.x1
self.y0 = self.y1
self.x1 = event.x()
self.y1 = event.y()
self.update()
def mouseReleaseEvent(self, event):
self.flag = False
class Widget(QWidget):
def __init__(self,parent=None):
super(Widget,self).__init__(parent)
self.resize(1000, 400)
self.initUi()
def initUi(self):
self.canvas = MyLabel()
layout = QHBoxLayout()
btnPen = QPushButton('画笔')
btnPen.clicked.connect(self.DrawOn)
penColor = QComboBox()
penColor.addItems(['红色 肿瘤','绿色 间质', '紫色 坏死', '蓝色 淋巴'])
penColor.currentTextChanged.connect(self.ColorChange)
btnEraser = QPushButton('橡皮擦')
btnEraser.clicked.connect(self.DrawOff)
penWidth = QSpinBox()
penWidth.resize(20,30)
penWidth.setRange(20,60)
penWidth.setValue(30)
penWidth.valueChanged.connect(self.canvas.widthChange)
fLayout = QFormLayout()
fLayout.setContentsMargins(0, 0, 0, 0)
fLayout.addRow(btnPen)
fLayout.addRow(penColor)
fLayout.addRow(btnEraser)
fLayout.addRow(penWidth)
wid_left = QWidget()
wid_left.setMaximumWidth(200)
wid_left.setLayout(fLayout)
layout.addWidget(wid_left)
layout.addWidget(self.canvas)
self.setLayout(layout)
def DrawOn(self):
self.canvas.setDrawStatus(True)
def ColorChange(self, color):
if color == '红色 肿瘤':
self.canvas.setPenColor(QColor(255, 0, 0, 40))
elif color == '绿色 间质':
self.canvas.setPenColor(QColor(0, 255, 0, 40))
elif color == '紫色 坏死':
self.canvas.setPenColor(QColor(153, 0, 255, 40))
elif color == '蓝色 淋巴':
self.canvas.setPenColor(QColor(0, 0, 255, 40))
def DrawOff(self):
self.canvas.setDrawStatus(False)
if __name__ == '__main__':
app = QApplication(sys.argv)
window = Widget()
window.show()
sys.exit(app.exec())
只能出现一个点，想要画出自由的线。
