标签:ctf bsp else tco second 原因 cal translate line
参考程序链接:https://yq.aliyun.com/articles/119927,感谢作者。
该图为pyqt5实现的效果图:
下附源码:
from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import * from math import * import sys class clockForm(QWidget): def __init__(self): super().__init__() self.setWindowTitle("Clock") self.timer=QTimer() #设置窗口计时器 self.timer.timeout.connect(self.update) self.timer.start(1000) def paintEvent(self,event): #时钟指针坐标点 hourPoint = [QPoint(7,8), QPoint(-7,8), QPoint(0, -30)] minPoint = [QPoint(7,8), QPoint(-7,8), QPoint(0, -65)] secPoint = [QPoint(7,8), QPoint(-7,8), QPoint(0, -80)] #时钟指针颜色 hourColor = QColor(200, 100, 0, 200) minColor = QColor(0, 127, 127, 150) secColor = QColor(0, 160, 230, 150) side = min(self.width(), self.height()) painter = QPainter(self) painter.setRenderHint(QPainter.Antialiasing) painter.translate(self.width()/2, self.height()/2) #painter坐标系原点移至widget中央 painter.scale(side / 200, side / 200) #缩放painterwidget坐标系,使绘制的时钟位于widge中央,即钟表支持缩放 #绘制小时和分钟刻度线 painter.save() for i in range(0, 60): if (i % 5) != 0: painter.setPen(minColor) painter.drawLine(92, 0, 96, 0)#绘制分钟刻度线 else: painter.setPen(hourColor) painter.drawLine(88, 0, 96, 0)#绘制小时刻度线 painter.rotate(360/60) painter.restore() #绘制小时数字 painter.save() font = painter.font() font.setBold(True) painter.setFont(font) pointSize = font.pointSize() painter.setPen(hourColor) nhour = 0 radius = 100 for i in range(0, 12): nhour = i + 3 #按QT-Qpainter的坐标系换算,3小时的刻度线对应坐标轴0度 if nhour > 12: nhour = nhour - 12 x = radius*0.8*cos(i*30*pi/180.0) - pointSize y = radius*0.8*sin(i*30*pi/180.0) - pointSize/2.0 width = pointSize*2 height = pointSize painter.drawText(QRectF(x,y,width,height), Qt.AlignCenter, str(nhour)) painter.restore() time = QTime.currentTime() #绘制小时指针 painter.save() painter.setPen(Qt.NoPen) #无轮廓线 painter.setBrush(hourColor) #填充色 painter.rotate(30*(time.hour() + time.minute() / 60))#每圈360° = 12h 即:旋转角度 = 小时数 * 30° print(time.hour()) painter.drawConvexPolygon(QPolygonF(hourPoint)) painter.restore() #绘制分钟指针 painter.save() painter.setPen(Qt.NoPen) #无轮廓线 painter.setBrush(minColor) #填充色 painter.rotate(6*(time.minute() + time.second() / 60))#每圈360° = 60m 即:旋转角度 = 分钟数 * 6° painter.drawConvexPolygon(QPolygonF(minPoint)) painter.restore() #绘制秒钟指针 painter.save() painter.setPen(Qt.NoPen) #无轮廓线 painter.setBrush(secColor) #填充色 painter.rotate(6*time.second()) painter.drawConvexPolygon(QPolygonF(secPoint)) #每圈360° = 60s 即:旋转角度 = 秒数 * 6° painter.restore() if __name__=="__main__": app=QApplication(sys.argv) form=clockForm() form.show() app.exec_()
手动画了个简单的坐标系草图帮助理解,也方便自己以后查阅
如何实现钟表跟随窗口缩放?
painter.scale(side / 200, side / 200) painter的坐标原点一开始就移到widget的中央,然后以该点为原点开始绘制周围一圈的刻度线、时钟数字等。其中刻度线距离painter的原点最远painter.drawLine(92, 0, 96, 0),由于painter坐标系缩放的原因,刻度线顶点距离原点真实的长度为 96*side/200,基本接近0.5side,而side = min(self.width(), self.height()),所以时钟可以跟随窗口自由缩放
标签:ctf bsp else tco second 原因 cal translate line
原文地址:https://www.cnblogs.com/wangmantou/p/11350409.html