java 程式碼 點到線段的最短距離
轉自:http://hi.baidu.com/javalovers/item/74b6e60f9debaae6f45ba657
// 點到直線的最短距離的判斷 點(x0,y0) 到由兩點組成的線段(x1,y1) ,( x2,y2 )
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);// 線段的長度
b = lineSpace(x1, y1, x0, y0);// (x1,y1)到點的距離
c = lineSpace(x2, y2, x0, y0);// (x2,y2)到點的距離
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;// 半周長
double
space = 2 * s / a;// 返回點到線的距離(利用三角形面積公式求高)
return space;
}
// 計算兩點之間的距離
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;
}