Python Turtle Opacity? | 易学教程

问题

Just wondering, is it possible to make a turtle draw/fill with semi-transparent ink?

Something like:

turtle.setfillopacity(50) # Would set it to 50% transparency

Running python 2.7

回答1:

It's not possible to do that, but you could define your colors, and then a light equivalent, and use those.

Red = (255,0,0,0)
LRed = (100,0,0)

I think that would achieve similar effects. You could then just use a lighter color when you want it semi-transparent.

回答2:

This python turtle example fades out the text while keeping the original turtle stamps unmodified:

import turtle
import time

alex = turtle.Turtle()
alex_text = turtle.Turtle()
alex_text.goto(alex.position()[0], alex.position()[1])

alex_text.pencolor((0, 0, 0))       #black
alex_text.write("hello")
time.sleep(1)
alex_text.clear()

alex_text.pencolor((.1, .1, .1))       #dark grey
alex_text.write("hello")
time.sleep(1)

alex_text.pencolor((.5, .5, .5))       #Grey
alex_text.write("hello")
time.sleep(1)

alex_text.pencolor((.8, .8, .8))       #Light grey
alex_text.write("hello")
time.sleep(1)

alex_text.pencolor((1, 1, 1))          #white
alex_text.write("hello")
time.sleep(1)

alex_text.clear()                      #gone
time.sleep(1)

The text simulates an opacity increase to maximum. Alex's stamps are unmodified.

回答3:

You can by doing

import turtle
turtle = turtle.Turtle()
r = 100
g = 100
b = 100
a = 0.5
turtle.color(r,g,b,a)

(well, maybe it only works for repl.it)

回答4:

Well, you can use RGBA.
First, put in the normal statements:

import turtle
t = turtle.Turtle()

Then, use t.color(), but use RGBA.
The first portion of RGBA is the same as RGB, and the last value is the percentage of opacity (where 0 is transparent, 1 is opaque.)

t.color(0,0,0,.5)

will get you black with 50% opacity.

回答5:

you can do this by using turtle.hideturtle() if you want full opacity.

Like used here in the last line:

import turtle

t = turtle.Turtle()

t.speed(1)

t.color("blue")

t.begin_fill()
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.end_fill()

t.color("red")

t.begin_fill()
t.forward(101)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.end_fill()

t.color("green")

t.begin_fill()
t.forward(101)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.end_fill()

t.color("yellow")

t.begin_fill()
t.forward(101)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.end_fill()

t.hideturtle()

来源：https://stackoverflow.com/questions/20322465/python-turtle-opacity

标签

python

turtle-graphics