问题描述
我知道一个线段与垂直端盖我想创建的距离/尺寸的终点，但我需要calcuate垂直线的终点。我一直在敲打我的头靠在墙上使用任何45-45-90三角形和圆点的产品，但我似乎无法让它走到一起。
I know the end points of a line segment and the distance/size of the perpendicular end caps I'd like to create but I need to calcuate the end points of the perpendicular line. I've been banging my head against the wall using either 45-45-90 triangles and dot products but I just can't seem to make it come together.
我知道蓝色和红色点之间的距离的点，我需要找到的点为红色。
I know the points in blue and the distance to the points in red, I need to find the points in red.
在标记为重复，我想张贴在this问题但它导致端盖它总是垂直。
Before marking as duplicate, I tried the answer posted in this question but it resulted in end caps which were always vertical.
推荐答案
如果B1是2红点之间的蓝点，B2是其他蓝色点，则做到这一点的方法是：
If B1 is the blue point between the 2 red points, and B2 is the other blue point then the way to do this is:
- 找到B1 - B2
- 正常化这一载体
- 然后按一半的红点之间的距离扩大这个载体了
- 在旋转90度
- 将此向量B1（这是R1）
- 在减去此向量从B1（这是R2）
以上全部是相当简单 - ！最棘手位将被搞清楚怎么写出来文本
All of the above is fairly straightforward - the trickiest bit would be figuring out how to write it out in text!
这可能是有益的，但 - 矩阵旋转90度：
This might be helpful though - matrix to rotate by 90 degrees:
[ 0 -1 ]
[ 1 0 ]
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