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本程序供增建第二线的直线上改变线间距、直线上换侧及改建既有线的直线上侧移等情况下计算线间距之用。本程序采用直接计算线间距的方法,从而避免了过去采用角图法计算引起的误差,同时也避免了过去先算法线距然后再与缓和曲线内移量叠加引起的误差。因此,改变了的算法较为简便,适合于电算的特点,且提高了精度。
This program for the construction of the second line of the line to change the line spacing, straight line on the side and rebuild the existing line of the straight line on the side shift and other circumstances used to calculate the line spacing. This program uses the method of calculating the line spacing directly, thus avoiding the error caused by using the histogram calculation method in the past, and also avoiding the error caused by the superimposition of the shift of the past algorithm line spacing and then the easing curve. Therefore, the changed algorithm is simple, suitable for computing characteristics, and improve the accuracy.