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【作品展示】

 

【作品介绍】

画心脏线的代码

 

【作品源代码】

from turtle import setup, Pen, done, tracer, bgcolor, title
from math import sin, cos

class Heart():
    def __init__(self, width, height):
        self.heart = Pen()

        self.H1 = -(width - 11) // 2 - 4
        self.V1 = -(height - 11) // 2 + 4
        self.H2, self.V2 = -self.H1, -self.V1
        if width % 2 == 0:
            self.H1 += 1
            self.H2 += 1

        self.h1, self.h2 = -3.5, 3.5
        self.v1, self.v2 = -3.5, 3.5

        self.a1 = (self.H1 - self.H2) / (self.h1 - self.h2)
        self.b1 = (self.h1 * self.H2 - self.h2 * self.H1) / (self.h1 - self.h2)
        self.a2 = (self.V1 - self.V2) / (self.v1 - self.v2)
        self.b2 = (self.v1 * self.V2 - self.v2 * self.V1) / (self.v1 - self.v2)

        self.heart.speed(3)
        self.heart.pencolor('#00FFFF')

        self.heart.color('#0000FF', 'sky blue')
        self.heart.pensize(1)
        self.drawFn(self.myFunc, 0.5 * 3.1415926, 2.5 * 3.1415926, 0.05)
        self.heart.goto(30, 180)
        self.heart.write('心脏线与ρ=1-sin(θ)的图像', font=('宋体', 18, 'bold'))

        self.heart.ht()
        done()

    def myFunc(self, θ):
        ρ = 1 - sin(θ)
        x = ρ * cos(θ)
        y = ρ * sin(θ)
        return x, y

    def drawFn(self, fn, lower, upper, step):
        θ = lower
        x, y = fn(θ)
        self.heart.goto(self.tran(x, y))
        self.heart.pd()
        self.heart.begin_fill()
        while θ < upper:
            θ += step
            x, y = fn(θ)
            self.heart.goto(self.tran(x, y))
        self.heart.pu()
        self.heart.end_fill()

    def tran(self, x, y):
        return self.a1 * x + self.b1, self.a2 * y + self.b2

class TurtleCoordinate():
    def __init__(self, width, height, step, color, speed):
        self.width = width
        self.height = height
        self.coordinate = Pen()
        self.coordinate.color(color)
        self.coordinate.ht()
        setup(self.width, self.height)

        self.step = step
        self.speed = speed

        self.w = self.width // 2
        self.h = self.height // 2
        self.show()

    def drawLine(self, x1, y1, x2, y2):
        self.coordinate.pu()
        self.coordinate.goto(x1, y1)
        self.coordinate.pd()
        self.coordinate.goto(x2, y2)
        self.coordinate.pu()

    def labelPoint(self, x1, y1, label):
        self.coordinate.pu()
        self.coordinate.goto(x1, y1)
        self.coordinate.pd()
        self.coordinate.write(label)
        self.coordinate.pu()

    def labelGridPoint(self, x, y, isVertical, text):
        if isVertical:
            self.drawLine(x, 2, x, 0)
            self.labelPoint(x-5, y-15, text)
        else:
            self.drawLine(2, y, 0, y)
            self.labelPoint(x-22, y-8, text)

    def show(self):
        self.coordinate.speed(self.speed)

        self.drawLine(-self.w, 0, self.w, 0)
        self.drawLine(0, -self.h, 0, self.h)

        for x in range(-self.w, self.w, self.step):
            self.labelGridPoint(x, 0, True, x)
        self.drawLine(self.w-10, 10, self.w, 0)
        self.drawLine(self.w-10, -10, self.w, 0)
        self.labelPoint(self.w, 10, "x")

        for y in range(-self.h, self.h, self.step):
            if y != 0:
                self.labelGridPoint(0, y, False, y)
        self.drawLine(-10, self.h-10, 0, self.h)
        self.drawLine(10, self.h-10, 0, self.h)
        self.labelPoint(-10, self.h, "y")

        self.coordinate.speed(1)

    def hide(self):
        self.coordinate.clear()

def keep():
    while True:
        pass

title('心脏线')
bgcolor("#000000")
tc = TurtleCoordinate(1200, 800, 100, '#0000FF', 5)
hp = Heart(1200, 800)

keep()

 

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