44 lines
942 B
Python
44 lines
942 B
Python
# -*- coding: utf-8 -*-
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"""
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【簡介】
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在視窗中畫點的範例
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"""
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import sys, math
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from PyQt5.QtWidgets import *
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from PyQt5.QtGui import *
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from PyQt5.QtCore import Qt
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class Drawing(QWidget):
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def __init__(self, parent=None):
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super(Drawing, self).__init__(parent)
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self.resize(300, 200)
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self.setWindowTitle("在視窗中畫點")
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def paintEvent(self, event):
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# 初始化繪圖工具
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qp = QPainter()
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qp.begin(self)
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# 自訂畫點方法
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self.drawPoints(qp)
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qp.end()
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def drawPoints(self, qp):
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qp.setPen( Qt.red)
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size = self.size()
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for i in range(1000):
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# 繪製正弦函數圖形，它的週期是[-100, 100]
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x = 100 *(-1+2.0*i/1000)+ size.width()/2.0
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y = -50 * math.sin((x - size.width()/2.0)*math.pi/50) + size.height()/2.0
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qp.drawPoint(x, y)
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if __name__ == '__main__':
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app = QApplication(sys.argv)
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demo = Drawing()
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demo.show()
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sys.exit(app.exec_())
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