[英]Kivy: how to change widget size using numericproperty?
Trying to make a brick widget change size each time it respawns. 尝试使砖小部件每次重生时都更改其大小。
The py file has py文件有
class Game(FloatLayout):
player = ObjectProperty(None)
playbutton = ObjectProperty(None)
ratebutton = ObjectProperty(None)
brickg = ObjectProperty(None)
ballsin = NumericProperty(0)
bricklist = ListProperty([])
score = NumericProperty(0)
switch = NumericProperty(0)
level = NumericProperty(0)
def __init__(self, *args, **kwargs):
super(Game, self).__init__(*args, **kwargs)
Clock.schedule_interval(self.update, 1./60)
def spawn_brick(self, *args):
b2 = BrickGreen(x=randint(50, self.width - 50), \
y=randint(self.height - self.height / 4, self.height - (self.height/13)))
self.bricklist.append(b2)
self.add_widget(b2)
def check_brick_spawn(self, *args):
if len(self.bricklist) == 0:
if self.level == 0:
BrickGreen.brickwidth = 100
self.spawn_brick()
elif self.level == 1:
BrickGreen.brickwidth = 75
self.spawn_brick()
else:
BrickGreen.brickwidth = 50
self.spawn_brick()
class BrickGreen(Widget):
def __init__(self, **kwargs):
super(BrickGreen, self).__init__(**kwargs)
brickwidth = NumericProperty(0)
and the kv file has 并且kv文件具有
<BrickGreen>:
size_hint: None, None
size: self.brickwidth, 25
canvas:
Color:
rgba: 0, 1, 0, 1
Rectangle:
pos: self.pos
size: self.size
Essentially, level 0 should have bricks with length of 100, once it breaks it goes to level 1 and should spawn bricks with lenght of 75, but it's staying at 100 从本质上讲,级别0应该具有长度为100的砖块,一旦断开,它就会到达级别1,并且应该生成长度为75的砖块,但是它保持在100
BrickGreen.brickwidth = 100
BrickGreen.brickwidth = 100
This replaces the NumericProperty at class level with the number 100. You need to set the value of brickwidth for instances of your objects, not the classes themselves. 这将用数字100替换类级别的NumericProperty。您需要为对象的实例而不是类本身的实例设置brickwidth的值。 In this case, you could (for instance) pass the width you want to your
spawn_brick
method, and use it when instantiating the BrickGreen. 在这种情况下,您可以(例如)将所需的宽度传递给
spawn_brick
方法,并在实例化BrickGreen时使用它。
You also need to declare the NumericProperty at class level, not inside __init__
. 您还需要在类级别而不是
__init__
内声明NumericProperty。
I suggest reading the kivy documentation on properties and going through the examples to see how these should be used. 我建议阅读有关属性的kivy文档,并仔细阅读示例以了解应如何使用这些属性。
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