在Python中使用Turtle绘制图形网格
Turtle是Python中的一个内置模块。它提供了使用屏幕(纸板)和turtle(笔)的绘画。为了在屏幕上画东西,我们需要移动turtle(笔)。为了移动turtle,有一些函数,如forward()、backward()等。
步骤:
以下是使用的步骤。
- Import turtle
- Set screen
- Make turtle
- 绘制Y轴线
- 绘制X轴线
- 画出X轴和Y轴,并标明标签。
以下是实现情况。
# import package and making objects
import turtle
sc=turtle.Screen()
trtl=turtle.Turtle()
# method to draw y-axis lines
def drawy(val):
# line
trtl.forward(300)
# set position
trtl.up()
trtl.setpos(val,300)
trtl.down()
# another line
trtl.backward(300)
# set position again
trtl.up()
trtl.setpos(val+10,0)
trtl.down()
# method to draw y-axis lines
def drawx(val):
# line
trtl.forward(300)
# set position
trtl.up()
trtl.setpos(300,val)
trtl.down()
# another line
trtl.backward(300)
# set position again
trtl.up()
trtl.setpos(0,val+10)
trtl.down()
# method to label the graph grid
def lab():
# set position
trtl.penup()
trtl.setpos(155,155)
trtl.pendown()
# write 0
trtl.write(0,font=("Verdana", 12, "bold"))
# set position again
trtl.penup()
trtl.setpos(290,155)
trtl.pendown()
# write x
trtl.write("x",font=("Verdana", 12, "bold"))
# set position again
trtl.penup()
trtl.setpos(155,290)
trtl.pendown()
# write y
trtl.write("y",font=("Verdana", 12, "bold"))
# Main Section
# set screen
sc.setup(800,800)
# set turtle features
trtl.speed(100)
trtl.left(90)
trtl.color('lightgreen')
# y lines
for i in range(30):
drawy(10*(i+1))
# set position for x lines
trtl.right(90)
trtl.up()
trtl.setpos(0,0)
trtl.down()
# x lines
for i in range(30):
drawx(10*(i+1))
# axis
trtl.color('green')
# set position for x axis
trtl.up()
trtl.setpos(0,150)
trtl.down()
# x-axis
trtl.forward(300)
# set position for y axis
trtl.left(90)
trtl.up()
trtl.setpos(150,0)
trtl.down()
# y-axis
trtl.forward(300)
# labeling
lab()
# hide the turtle
trtl.hideturtle()
输出 :