绘画 - 在屏幕上绘制线条和形状。单击标记形状的起点,再次单击标记形状的终点。可使用键盘选择不同的形状和颜色。
"""Paint, for drawing shapes.
Exercises
1. Add a color.
2. Complete circle.
3. Complete rectangle.
4. Complete triangle.
5. Add width parameter.
"""
from turtle import *
from freegames import vector
def line(start, end):
"""Draw line from start to end."""
up()
goto(start.x, start.y)
down()
goto(end.x, end.y)
def square(start, end):
"""Draw square from start to end."""
up()
goto(start.x, start.y)
down()
begin_fill()
for count in range(4):
forward(end.x - start.x)
left(90)
end_fill()
def circle(start, end):
"""Draw circle from start to end."""
pass # TODO
def rectangle(start, end):
"""Draw rectangle from start to end."""
pass # TODO
def triangle(start, end):
"""Draw triangle from start to end."""
pass # TODO
def tap(x, y):
"""Store starting point or draw shape."""
start = state['start']
if start is None:
state['start'] = vector(x, y)
else:
shape = state['shape']
end = vector(x, y)
shape(start, end)
state['start'] = None
def store(key, value):
"""Store value in state at key."""
state[key] = value
state = {'start': None, 'shape': line}
setup(420, 420, 370, 0)
onscreenclick(tap)
listen()
onkey(undo, 'u')
onkey(lambda: color('black'), 'K')
onkey(lambda: color('white'), 'W')
onkey(lambda: color('green'), 'G')
onkey(lambda: color('blue'), 'B')
onkey(lambda: color('red'), 'R')
onkey(lambda: store('shape', line), 'l')
onkey(lambda: store('shape', square), 's')
onkey(lambda: store('shape', circle), 'c')
onkey(lambda: store('shape', rectangle), 'r')
onkey(lambda: store('shape', triangle), 't')
done()