java - Complex Polygon Area -


clonelist = point[] (series of points put constructor) have tried many different times fix formula, coming wanting. formula found on http://en.wikipedia.org/wiki/shoelace_formula index(i) point has both x , y values.

public double getarea() {     double area = 0;       (int = 0; < clonelist.length-1; i++){        area += clonelist[i].getx()*clonelist[i+1].gety() - clonelist[i+1].getx()+clonelist[i].gety();  }       area = area/2;     //system.out.println(math.abs(area)); return math.abs(area); }

i'm not familiar formula ill give shot... me looks though not following formula correctly, implementation(based on gleaned wiki page xd)

public double getarea(){     double area = 0;     int n = clonelist.length;     double firstsum = 0;     double secondsum = 0;     for(int = 0;i< clonelist.length - 1;i++){         firstsum+= clonelist[i].getx()*clonelist[i+1].gety();         secondsum+= clonelist[i+1].getx()*clonelist[i].gety();     }     firstsum+=clonelist[clonelist.length-1].getx()*clonelist[0].gety();     secondsum-=clonelist[0].getx()*clonelist[clonelist.length-1].gety();      double finalsum = firstsum-secondsum;     area = math.abs(finalsum)/2;     return area;    }

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