Java-点对点 [英] Java - Point on line

问题描述

我如何确定一个点(x，y)是否在其他两个点之间创建的直线上? 我尝试了此操作，但似乎有些问题，因为我没有得到应有的结果.

How can i find out if a Point(x,y) is on a the Line created between two other Points? I tried this but something seems to be wrong, as i don't get the results i should.

public boolean intersects(Point k, Point z, Point p) {

        Line2D line = new Line2D.Float(k.x, k.y, z.x, z.y);

        if (line.ptLineDist(p) == 0) {
            return true;
        } else {
            return false;
        }

    }

推荐答案

尝试此操作，要考虑到Hovercraft关于浮点数不精确度的注意事项.

Try this, taking Hovercraft's note about floating point numbers' imprecision into account.

public boolean intersects(Point k, Point z, Point p) {
       return new Line2D.Float(k, z).ptLineDist(p) <= 0.01;
}

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