python - 每次移动操纵杆时更改矩形的图像源

Question

我在 Kivy 中构建了自己的操纵杆，每当我移动它时，角色也会随之移动。我想要它，以便矩形（角色）的源图像在我移动时发生变化，使其看起来像在行走，但在这段代码中，只有当我将操纵杆放在某个方向时它才会发生变化。有可能做到吗？

还有1个问题，只要操纵杆在边缘，我想让角色仍然移动，在这段代码中，只要我停止移动操纵杆，它就会停止。

这是main.py

class Controller(Widget):
    control = ObjectProperty(None)
    def __init__(self, **kwargs):
        super(Controller, self).__init__(**kwargs)

        with self.canvas:
             self.rect = Rectangle(pos=(300, 300), size=(50, 50))

    def on_touch_move(self, touch):
        addx = int(touch.x)-50
        addy = int(touch.y)-50
        print(str(addx) + " " + str(addy))
        self.control.size = 95, 95
        if addx >= 90:
            addx = 90
        if addy >= 90:
            addy = 90
        if addx <= 10:
            addx = 10
        if addy <= 10:
            addy = 10

        if addx > 50:
            self.rect.pos = self.rect.pos[0] + 2, self.rect.pos[1]
            self.rect.source = "assets/faceleft_rightfootinfront.png"
        if addy > 50:
            self.rect.pos = self.rect.pos[0], self.rect.pos[1] + 2
            self.rect.source = "assets/faceleft_leftfootinfront.png"
        if addx < 50:
            self.rect.pos = self.rect.pos[0] - 2, self.rect.pos[1]
            self.rect.source = "assets/faceright_leftfootinfront.png"
        if addy < 50:
            self.rect.pos = self.rect.pos[0], self.rect.pos[1] - 2
            self.rect.source = "assets/faceright_rightfootinfront.png"

        self.control.pos = addx, addy

    def on_touch_down(self, touch):
        pass     # Overriding so it doesnt turn blue

    def on_touch_up(self, touch):
        self.control.pos = (50, 50)    # Return to original position
        self.control.size = 100, 100

继承人main.kv

<Controller>
control: control
Button:
    id: control
    background_normal: "assets/controller.png"
    pos: 50, 50
<Character>
character: character
Rectangle:
    id: character
    size: 25, 25
    pos: 400, 400

标签： pythonkivy

Answer 1

每次self.rect.source鼠标移动都会更改两次，因此只有最后一次更改才会生效。在您的系列if addx和if addy条件中，True每次都会有两个。也许确定self.rect.source更改的不同代码块会更好。

为了让运动继续，您只需要使用Clock.schedule_interval()来安排连续运动。这是您的Controller课程的修改版本：

class Controller(Widget):
    control = ObjectProperty(None)
    def __init__(self, **kwargs):
        super(Controller, self).__init__(**kwargs)
        self.sched = None

        with self.canvas:
            Color(1,0,0,1)
            self.rect = Rectangle(pos=(300, 300), size=(50, 50))

    def on_touch_move(self, touch):
        if self.sched is not None:   # cancel motion
            self.sched.cancel()
            self.sched = None
        addx = int(touch.x)-50
        addy = int(touch.y)-50
        print(str(addx) + " " + str(addy))
        self.control.size = 95, 95
        if addx >= 90:
            addx = 90
        if addy >= 90:
            addy = 90
        if addx <= 10:
            addx = 10
        if addy <= 10:
            addy = 10

        self.move_it(addx, addy, 0)  # without this the image will only move when mouse motion stops

        self.sched = Clock.schedule_interval(partial(self.move_it, addx, addy), 0.05)

        self.control.pos = addx, addy

    def move_it(self, addx, addy, dt):
        if addx > 50:
            self.rect.pos = self.rect.pos[0] + 2, self.rect.pos[1]
            self.rect.source = "back.png"
        if addy > 50:
            self.rect.pos = self.rect.pos[0], self.rect.pos[1] + 2
            self.rect.source = "forward.png"
        if addx < 50:
            self.rect.pos = self.rect.pos[0] - 2, self.rect.pos[1]
            self.rect.source = "back.png"
        if addy < 50:
            self.rect.pos = self.rect.pos[0], self.rect.pos[1] - 2
            self.rect.source = "forward.png"

    def on_touch_down(self, touch):
        pass     # Overriding so it doesnt turn blue

    def on_touch_up(self, touch):
        if self.sched is not None:   # cancel motion
            self.sched.cancel()
            self.sched = None
        self.control.pos = (50, 50)    # Return to original position
        self.control.size = 100, 100