请问这个示例代码的这个格式根据什么算出来的?或者怎末理解他?
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# 绘制箭头 # # 这个例子展示了如何使用OpenMV内置的画箭头功能。 import sensor, image, time, pyb sensor.reset() sensor.set_pixformat(sensor.RGB565) # or GRAYSCALE... sensor.set_framesize(sensor.QVGA) # or QQVGA... sensor.skip_frames(time = 2000) clock = time.clock() while(True): clock.tick() img = sensor.snapshot() for i in range(10): x0 = (pyb.rng() % (2*img.width())) - (img.width()//2) y0 = (pyb.rng() % (2*img.height())) - (img.height()//2) x1 = (pyb.rng() % (2*img.width())) - (img.width()//2) y1 = (pyb.rng() % (2*img.height())) - (img.height()//2) r = (pyb.rng() % 127) + 128 g = (pyb.rng() % 127) + 128 b = (pyb.rng() % 127) + 128
这里的 x0 = (pyb.rng() % (2*img.width())) - (img.width()//2)和r = (pyb.rng() % 127) + 128
为什么是这样计算呢?
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rng()是产生一个随机数。
draw_arrow:https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.image.html#image.draw_arrow
效果:
https://book.openmv.cc/example/03-Drawing/arrow-drawing.html