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jquery - 如何围绕一个圆圈放置元素

转载 作者:太空狗 更新时间:2023-10-29 12:35:45 26 4
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A lot of the math that goes into basic shape-based positioning is relatively straight-forward. Chances are you probably already covered it in highschool, so much of this will seem familiar. Consider that a circle has a center (j,k) and a radius r. The x and y positions for any point that occurs on the circle’s path is then

x(t) = r cos (t) + j, y(t) = r sin(t) + k. A more generic way of writing this which can be used for our first attempt at coordinate-based positioning is: ? 1 2

x = centerX + Math.cos(radians) * radius; y = centerY + Math.sin(radians) * radius;

where radians = (angle_of_the_circle/180) * Math.PI. centerX is the X center of the circle on our page and centerY is the Y center of the circle.

任何人都可以让我清楚地了解上述技术是如何工作的吗?

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