Question

我正在尝试使用raspberry pi制作一个使用心率日期作为触发器的动画。我使用了github代码https://github.com/tutRPi/Raspberry-Pi-Heartbeat-Pulse-Sensor并使用example.py作为我工作的基础。

我还使用了一个很棒的教程，可以使用tkinter在屏幕上移动。

我对python完全不熟悉，并且无法在if语句中播放动画。理想情况下，我希望球能够以bmp数据生成的速度移动，这样更快的心率将使它们更快地移动。此刻我似乎离这个很远。如果有人能帮助我实现这一目标，我将永远感激不尽。就目前而言，球出现但不动。我认为与运动和bpm更新存在冲突......

以下是代码：

from pulsesensor import Pulsesensor
import time
from tkinter import *
import random

tk = Tk()
WIDTH=1500
HEIGHT=800
canvas = Canvas(tk, bg="brown4", height=HEIGHT, width= WIDTH)
tk.title("drawing")
canvas.pack()

##below is the class to create multiple balls that are coloured
##and move and detect the edge and bounce

class Ball:
    def __init__(self, color, size):
        self.shape  = canvas.create_oval (10, 10, size,  size, fill=color, 
                                          outline=color, stipple="gray25")
        self.xspeed = random.randrange(-1,5)
        self.yspeed = random.randrange(-1,5)

    def move(self):
        canvas.move(self.shape, self.xspeed, self.yspeed)
        pos = canvas.coords(self.shape)
        if pos[3]>=HEIGHT or pos[1]<=0:
            self.yspeed=-self.yspeed
        if pos[2] >=WIDTH or pos[0] <=0:
            self.xspeed=-self.xspeed


colors=["red4", "red3", "OrangeRed2","OrangeRed4","firebrick3"]
##this is make 100 balls
balls=[]
##this is to set the colour and size of the balls which is randomised:
for i in range (100):
    balls.append(Ball(random.choice(colors), random.randrange(150, 200)))

##this is to call the balls
##while True:

p = Pulsesensor()
p.startAsyncBPM()

try:
    while True:
        bpm = p.BPM
        if bpm > 0:
            print("BPM: %d" % bpm)
            for ball in balls:
                    ball.move()
            tk.update()
            time.sleep(0.02)
            tk.mainloop()
        else:
            print("No Heartbeat found")
        time.sleep(1)
except:
    p.stopAsyncBPM()

Answer 1

我没有Raspberry-Pi或脉冲传感器，所以以下只能在一定程度上进行测试 - 但希望它能为您提供更好的基础代码。我减少了球的数量，以便更容易看到发生了什么。我真的不明白他们的动作应该与脉搏率有什么关系，所以你需要自己充实...

使用tkinter时，了解所发生的一切必须通过mainloop()这一点非常重要，Canvas通常不会返回，直到应用程序脚本退出（因此它本质上是一个无尽的循环）。这意味着您通常无法随时调用它。在这种情况下，＆＃34;轮询＆＃34;函数被使用，并以设定的间隔调用它来更新mainloop()对象 - 当<{em} from pulsesensor import Pulsesensor import random from tkinter import * WIDTH=1500 HEIGHT=800 COLORS = ["red4", "red3", "OrangeRed2", "OrangeRed4", "firebrick3"] DELAY = 200 # In millisecs NUMBALLS = 5 class Ball: def __init__(self, color, size): self.shape = canvas.create_oval(10, 10, size, size, fill=color, outline=color, stipple="gray25") self.xspeed = random.randrange(-1, 5) self.yspeed = random.randrange(-1, 5) def move(self): canvas.move(self.shape, self.xspeed, self.yspeed) pos = canvas.coords(self.shape) if pos[3] >= HEIGHT or pos[1] <= 0: self.yspeed = -self.yspeed if pos[2] >= WIDTH or pos[0] <= 0: self.xspeed = -self.xspeed def poll(p): try: # bpm = p.BPM bpm = random.randint(0, 200) # Random value for testing. if bpm < 1: # print("No Heartbeat found") pass else: # print("BPM: %d" % bpm) for ball in balls: ball.move() except Exception as exc: print('Exception raised: {}'.format(exc)) p.stopAsyncBPM() root.quit() root.after(DELAY, poll, p) # Call this function again after delay. if __name__ == '__main__': root = Tk() root.title("Beating Heart") canvas = Canvas(root, bg="brown4", height=HEIGHT, width=WIDTH) canvas.pack() balls = [Ball(random.choice(COLORS), random.randrange(150, 200)) for _ in range(NUMBALLS)] p = Pulsesensor() p.startAsyncBPM() poll(p) # Start polling. root.mainloop()正在运行时，它将全部发生。

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tkinter python心率和动画

1 个答案: