PyQt5-用像素点绘制正弦曲线

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Python生成正弦波信号 import numpy as np import matplotlib.pyplot as plt def sin_wave(A, f, fs, phi, t): ''' :params A: 振幅 :params f: 信号频率 :params fs: 采样频率 :params phi: 相位 :params t: 时间... 阅读详情

PyQt5-用像素点绘制正弦曲线

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/6/16 18:57
# @Author : kevin
# @Site : 
# @File : 用像素点绘制正弦曲线.py
# @Software: PyCharm
"""
用像素点绘制正弦曲线

drawPoint(x, y)


"""
import sys,math
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import Qt


class DrawPoints(QWidget):
    def __init__(self):
        super(DrawPoints, self).__init__()
        self.resize(300, 300)   # 设置主窗口大小
        self.setWindowTitle('在窗口上用像素点绘制2个周期的正弦曲线')  # 设置主窗口标题

    def paintEvent(self, event):
        painter = QPainter()  # 创建painter对象
        painter.begin(self)  # 设置开始
        painter.setPen(Qt.red)  # 设置画笔的颜色
        size = self.size()  # 获得窗口的尺寸

        for i in range(10000):  # 增大range值同时增加x中i/range的最大值可以增加绘制点的密度
            x = 100 * (-1 + 2.0 * i/10000) + size.width()/2.0
            y = -50 * math.sin((x - size.width()/2.0) * math.pi/50) + size.height()/2.0  #
            painter.drawPoint(x, y)  # 绘制点x,y

        painter.end()  # 绘制结束



if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = DrawPoints()
    main.show()
    sys.exit(app.exec_())