python画圆函数方法 python里怎么画圆

python turtle画4个同心圆方法

import turtle

#draw first circle

turtle.penup()

turtle.goto(0,-200)

turtle.pendown()

turtle.circle(200)

#draw second circle

turtle.penup()

turtle.goto(0,-150)

turtle.pendown()

turtle.circle(150)

#draw third circle

turtle.penup()

turtle.goto(0,-100)

turtle.pendown()

turtle.circle(100)

#draw fourth circle

turtle.penup()

turtle.goto(0,-50)

turtle.pendown()

turtle.circle(50)

画笔的坐标默认在0,0，就以它为圆心。

因为turtle画圆的时候是从圆的底部开始画的，所以需要找到四个圆底部的坐标

比如:

第一个半径为200的圆，底部为（0,-200)

第二个半径为150的圆，底部为（0,-150)

第三个半径为100的圆，底部为（0,-100)

第四个半径为  50的圆，底部为（0,  -50)

画的时候按下面的步骤：

抬起画笔：turtle.penup()

移动到相应坐标：turtle.goto(坐标)

放下画笔：turtle.pendown()

画圆：turtle.circle(半径)

效果如下图所示:

python pyqt怎么画圆

这个例子我做了好几天：

1）官网C++的源码，改写成PyQt5版本的代码，好多细节不会转化

2）网上的PyQt的例子根本运行不了

填了无数个坑，结合二者，终于能完成了一个关于绘图的东西。这个过程也掌握了很多新的知识点

【知识点】

1、关于多个点的使用

poitns = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)]

请看：

1      # 定义多个点 2      points = [QPoint(10, 80), QPoint(20, 10), QPoint(80, 30), QPoint(90, 70)] 3  4      # ===直接使用 points 会报错！========= 5      # ... 6      elif self.shape == self.Points: 7            painter.drawPoints(points) 8  9      elif self.shape == self.Polyline:10            painter.drawPolyline(points)11 12      elif self.shape == self.Polygon:13            painter.drawPolygon(points, 4)14 15      # ...16 17      # ===把 points 用 QPolygon()包裹起来才正确！=========18      # ...19      elif self.shape == self.Points:20            painter.drawPoints(QPolygon(points))21 22      elif self.shape == self.Polyline:23            painter.drawPolyline(QPolygon(points))24 25      elif self.shape == self.Polygon:26            painter.drawPolygon(QPolygon(points), 4)27 28      # ...

2、在QDialog窗体中显示QWidget部件

【效果图】

【资源】

【代码】

import sysfrom PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *class StockDialog(QWidget):    def __init__(self, parent=None):

super(StockDialog, self).__init__(parent)

self.setWindowTitle("利用QPainter绘制各种图形")

mainSplitter = QSplitter(Qt.Horizontal)

mainSplitter.setOpaqueResize(True)

frame = QFrame(mainSplitter)

mainLayout = QGridLayout(frame)        #mainLayout.setMargin(10)

mainLayout.setSpacing(6)

label1=QLabel("形状：")

label2=QLabel("画笔线宽：")

label3=QLabel("画笔颜色：")

label4=QLabel("画笔风格：")

label5=QLabel("画笔顶端：")

label6=QLabel("画笔连接点：")

label7=QLabel("画刷风格：")

label8=QLabel("画刷颜色：")

self.shapeComboBox = QComboBox()

self.shapeComboBox.addItem("Line", "Line")

self.shapeComboBox.addItem("Rectangle", "Rectangle")

self.shapeComboBox.addItem('Rounded Rectangle','Rounded Rectangle')

self.shapeComboBox.addItem('Ellipse','Ellipse')

self.shapeComboBox.addItem('Pie','Pie')

self.shapeComboBox.addItem('Chord','Chord')

self.shapeComboBox.addItem('Path','Path')

self.shapeComboBox.addItem('Polygon','Polygon')

self.shapeComboBox.addItem('Polyline','Polyline')

self.shapeComboBox.addItem('Arc','Arc')

self.shapeComboBox.addItem('Points','Points')

self.shapeComboBox.addItem('Text','Text')

self.shapeComboBox.addItem('Pixmap','Pixmap')

self.widthSpinBox = QSpinBox()

self.widthSpinBox.setRange(0,20)

self.penColorFrame = QFrame()

self.penColorFrame.setAutoFillBackground(True)

self.penColorFrame.setPalette(QPalette(Qt.blue))

self.penColorPushButton = QPushButton("更改")

self.penStyleComboBox = QComboBox()

self.penStyleComboBox.addItem("Solid",Qt.SolidLine)

self.penStyleComboBox.addItem('Dash',  Qt.DashLine)

self.penStyleComboBox.addItem('Dot',  Qt.DotLine)

self.penStyleComboBox.addItem('Dash Dot',  Qt.DashDotLine)

self.penStyleComboBox.addItem('Dash Dot Dot',  Qt.DashDotDotLine)

self.penStyleComboBox.addItem('None',  Qt.NoPen)

self.penCapComboBox = QComboBox()

self.penCapComboBox.addItem("Flat",Qt.FlatCap)

self.penCapComboBox.addItem('Square', Qt.SquareCap)

self.penCapComboBox.addItem('Round', Qt.RoundCap)

self.penJoinComboBox = QComboBox()

self.penJoinComboBox.addItem("Miter",Qt.MiterJoin)

self.penJoinComboBox.addItem('Bebel', Qt.BevelJoin)

self.penJoinComboBox.addItem('Round', Qt.RoundJoin)

self.brushStyleComboBox = QComboBox()

self.brushStyleComboBox.addItem("Linear Gradient",Qt.LinearGradientPattern)

self.brushStyleComboBox.addItem('Radial Gradient', Qt.RadialGradientPattern)

self.brushStyleComboBox.addItem('Conical Gradient', Qt.ConicalGradientPattern)

self.brushStyleComboBox.addItem('Texture', Qt.TexturePattern)

self.brushStyleComboBox.addItem('Solid', Qt.SolidPattern)

self.brushStyleComboBox.addItem('Horizontal', Qt.HorPattern)

self.brushStyleComboBox.addItem('Vertical', Qt.VerPattern)

self.brushStyleComboBox.addItem('Cross', Qt.CrossPattern)

self.brushStyleComboBox.addItem('Backward Diagonal', Qt.BDiagPattern)

self.brushStyleComboBox.addItem('Forward Diagonal', Qt.FDiagPattern)

self.brushStyleComboBox.addItem('Diagonal Cross', Qt.DiagCrossPattern)

self.brushStyleComboBox.addItem('Dense 1', Qt.Dense1Pattern)

self.brushStyleComboBox.addItem('Dense 2', Qt.Dense2Pattern)

self.brushStyleComboBox.addItem('Dense 3', Qt.Dense3Pattern)

self.brushStyleComboBox.addItem('Dense 4', Qt.Dense4Pattern)

self.brushStyleComboBox.addItem('Dense 5', Qt.Dense5Pattern)

self.brushStyleComboBox.addItem('Dense 6', Qt.Dense6Pattern)

self.brushStyleComboBox.addItem('Dense 7', Qt.Dense7Pattern)

self.brushStyleComboBox.addItem('None', Qt.NoBrush)

self.brushColorFrame = QFrame()

self.brushColorFrame.setAutoFillBackground(True)

self.brushColorFrame.setPalette(QPalette(Qt.green))

self.brushColorPushButton = QPushButton("更改")

labelCol=0

contentCol=1

#建立布局

mainLayout.addWidget(label1,1,labelCol)

mainLayout.addWidget(self.shapeComboBox,1,contentCol)

mainLayout.addWidget(label2,2,labelCol)

mainLayout.addWidget(self.widthSpinBox,2,contentCol)

mainLayout.addWidget(label3,4,labelCol)

mainLayout.addWidget(self.penColorFrame,4,contentCol)

mainLayout.addWidget(self.penColorPushButton,4,3)

mainLayout.addWidget(label4,6,labelCol)

mainLayout.addWidget(self.penStyleComboBox,6,contentCol)

mainLayout.addWidget(label5,8,labelCol)

mainLayout.addWidget(self.penCapComboBox,8,contentCol)

mainLayout.addWidget(label6,10,labelCol)

mainLayout.addWidget(self.penJoinComboBox,10,contentCol)

mainLayout.addWidget(label7,12,labelCol)

mainLayout.addWidget(self.brushStyleComboBox,12,contentCol)

mainLayout.addWidget(label8,14,labelCol)

mainLayout.addWidget(self.brushColorFrame,14,contentCol)

mainLayout.addWidget(self.brushColorPushButton,14,3)

mainSplitter1 = QSplitter(Qt.Horizontal)

mainSplitter1.setOpaqueResize(True)

stack1 = QStackedWidget()

stack1.setFrameStyle(QFrame.Panel|QFrame.Raised)

self.area = PaintArea()

stack1.addWidget(self.area)

frame1 = QFrame(mainSplitter1)

mainLayout1 = QVBoxLayout(frame1)        #mainLayout1.setMargin(10)

mainLayout1.setSpacing(6)

mainLayout1.addWidget(stack1)

layout = QGridLayout(self)

layout.addWidget(mainSplitter1,0,0)

layout.addWidget(mainSplitter,0,1)

self.setLayout(layout)

#信号和槽函数        self.shapeComboBox.activated.connect(self.slotShape)

self.widthSpinBox.valueChanged.connect(self.slotPenWidth)

self.penColorPushButton.clicked.connect(self.slotPenColor)

self.penStyleComboBox.activated.connect(self.slotPenStyle)

self.penCapComboBox.activated.connect(self.slotPenCap)

self.penJoinComboBox.activated.connect(self.slotPenJoin)

self.brushStyleComboBox.activated.connect(self.slotBrush)

self.brushColorPushButton.clicked.connect(self.slotBrushColor)

self.slotShape(self.shapeComboBox.currentIndex())

self.slotPenWidth(self.widthSpinBox.value())

self.slotBrush(self.brushStyleComboBox.currentIndex())

def slotShape(self,value):

shape =  self.area.Shape[value]

self.area.setShape(shape)

def slotPenWidth(self,value):

color = self.penColorFrame.palette().color(QPalette.Window)

style = Qt.PenStyle(self.penStyleComboBox.itemData(self.penStyleComboBox.currentIndex(),Qt.UserRole))

cap = Qt.PenCapStyle(self.penCapComboBox.itemData(self.penCapComboBox.currentIndex(),Qt.UserRole))

join = Qt.PenJoinStyle(self.penJoinComboBox.itemData(self.penJoinComboBox.currentIndex(),Qt.UserRole))

self.area.setPen(QPen(color,value,style,cap,join))

def slotPenStyle(self,value):

self.slotPenWidth(value)

def slotPenCap(self,value):

self.slotPenWidth(value)

def slotPenJoin(self,value):

self.slotPenWidth(value)

def slotPenColor(self):

color = QColorDialog.getColor(Qt.blue)

self.penColorFrame.setPalette(QPalette(color))

self.area.setPen(QPen(color))

def slotBrushColor(self):

color = QColorDialog.getColor(Qt.blue)

self.brushColorFrame.setPalette(QPalette(color))

self.slotBrush(self.brushStyleComboBox.currentIndex())

def slotBrush(self,value):

color = self.brushColorFrame.palette().color(QPalette.Window)

style = Qt.BrushStyle(self.brushStyleComboBox.itemData(value,Qt.UserRole))

if(style == Qt.Lin

python怎么用turtle画圆

turtle.circle ()

Turtle库是Python语言中一个很流行的绘制图像的函数库，想象一个小乌龟，在一个横轴为x、纵轴为y的坐标系原点，(0,0)位置开始，它根据一组函数指令的控制，在这个平面坐标系中移动，从而在它爬行的路径上绘制了图形。

python中radius的用法

python中radius的用法可以画圆。其方法有：

1、radius半径，可为正，也可为负。

2、半径为正时，圆心会在画笔开始方向的左侧。

3、半径为负时，圆心会在画笔开始方向的右侧。

加载中程序怎么编写画同心圆

加载中程序编写画同心圆。

1、打开在线python编辑器。这里用Python中的turtle函数画同心圆。

2、定义画圆的初始代码。

3、循环执行画5个同心圆。turtle.circle是从下方开始画圆的，画同心圆，则每一次都要将画笔移动到下一个圆的底部位置。

4、点击程序左上角的”运行“，查看画出的同心圆的效果。

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