根据2个点和半径绘制圆弧 [英] Draw an arc based on 2 Points and radius

问题描述

我正在尝试在面板内绘制一个Arc2D对象.但是我不确定如何计算. 我给的是起点Point2D和终点Point2D和半径. 问题在于，当半径更改时，startAngle和AngleExtent参数每次都不同. 另一个问题是，由于半径发生变化，因此每次包含圆弧的拟"圆的中心都在一个不同的点，另一个参数根据输入而变化，所以我无法使用(或不知道如何)使用setCenter()方法.

I'm trying to draw an Arc2D object inside a panel. however I'm not sure how to calculate it. What I have given is starting Point2D and an end Point2D and a radius. The problem is that when the radius changes, the startAngle and AngleExtent parameters are different every time. another problem is that since the radius changes, the center of the 'to-be' circle containing the arc is in a different point every time, another parameter which changes based on input, so I can't use (or don't know how) to use setCenter() method.

感谢您的帮助！

推荐答案

两个点和一个半径定义了两个弧(二维).您可以通过计算以两个点为中心的半径r的两个Circle的交点(java.awt.geom.Area.intersects)来找到它们的中心点.圆弧的圆心将是该区域的周长上位于您的两个初始点中间的点.

Two points and a radius define two arcs (in 2D). You can find their center points by calculating the intersection (java.awt.geom.Area.intersects) of the two Circles of radius r centered at your two points. The center point of the arcs' circles will be the points on the perimeter of that area halfway between your two initial points.

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