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wenlng avatar wenlng commented on May 20, 2024

正常情况下

  • 前端的坐标是以左上角来计算的，这毫无问题

和服务器储存的坐标信息对比，你会发现：

  • X轴的坐标信息是对的（Dx <= fontendX <= Dx+Width），这毫无问题
  • Y轴的坐标信息是错的，前端的Y轴坐标小于了后端的Y轴开始坐标，也就是（fontendY <= Dy <= Dy_Height）,你肯定会很紧张，以为自己算错了

把心放肚子里

  • 这是因为文字的坐标是以文字的左下角为原点的，也就是说服务端储存的Dy值已经是加上了Height之后的值了
  • 前端不需要任何处理，后端会在比对的时候自动减去Height值再进行比对，也就是（Dy - Height）≈ fontendY
  • 所以放心大胆的把这个看起来错误的Y值传给服务器，它会自己处理的

嘿，v2 版本即将更新，坐标会有所变化哟 _

from go-captcha.

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