The top left-hand corner of the rectangle follows the path, since that is where the rectangle's width and height are drawn from.

矩形的左上角始终沿着路径移动，这是因为矩形的长边和短边是从左上角开始绘制的。

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As the cone spreads across the landscape along the flight path, they create a continuous sonic boom along the full width of the cone's base.

这个圆锥体沿着飞行路线在地面上扫过，底部与地面接触部分产生连续的轰隆声。

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In other words, the area that's drawn extends to half the line width on either side of the path.

换句话说就是在路径的两边各绘制线宽的一半。

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