java源代码实例
<div class="msgfont">点到线段的最短距离 Java code <!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->private double pointToLine(int x1, int y1, int x2, int y2, int x0, int y0) { double space = 0; double a, b, c; a = lineSpace(x1, y1, x2, y2);// 线段的长度 b = lineSpace(x1, y1, x0, y0);// (x1,y1)到点的距离 c = lineSpace(x2, y2, x0, y0);// (x2,y2)到点的距离 if (c <= 0.000001 || b <= 0.000001) { space = 0; return space; } if (a <= 0.000001) { space = b; return space; } if (c * c >= a * a + b * b) { space = b; return space; } if (b * b >= a * a + c * c) { space = c; return space; } double p = (a + b + c) / 2;// 半周长 double s = Math.sqrt(p * (p - a) * (p - b) * (p - c));// 海伦公式求面积 space = 2 * s / a;// 返回点到线的距离（利用三角形面积公式求高） return space; } // 计算两点之间的距离 private double lineSpace(int x1, int y1, int x2, int y2) { double lineLength = 0; lineLength = Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); return lineLength; }
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