//計算向量
public Tuple <Data.VecInfo> XYVector(DataTable data)
{
double[] vec = new double[num]; //創建一個陣列存放向量
int clockwise = 0; //順時針
int counterclockwise = 0; //逆時針
for (int i = 0; i < num - 1; i++)
{
var X1 = Convert.ToInt32(data.Rows[i + 1]["X"]) - Convert.ToInt32(data.Rows[i]["X"]);
var X2 = Convert.ToInt32(data.Rows[i + 2]["X"]) - Convert.ToInt32(data.Rows[i + 1]["X"]);
var Y1 = Convert.ToInt32(data.Rows[i + 1]["Y"]) - Convert.ToInt32(data.Rows[i]["Y"]);
var Y2 = Convert.ToInt32(data.Rows[i + 2]["Y"]) - Convert.ToInt32(data.Rows[i + 1]["Y"]);
vec[i] = X1 * Y2 - Y1 * X2;
if (vec[i] > 0)
{
counterclockwise++;
}
else if (vec[i] < 0)
{
clockwise++;
}
}
Data.VecInfo vecInfo = new Data.VecInfo
{
clockwise = clockwise,
counterclockwise = counterclockwise,
};
return(new Tuple <Data.VecInfo>(vecInfo));
}
//計算向量
public Tuple <Data.VecInfo> XYVector(List <Data.Coordinates> data, int userSelectID, int show_num, int start_num)
{
double[] vec = new double[count]; //創建一個陣列存放向量
int clockwise = 0; //順時針
int counterclockwise = 0; //逆時針
SelectXAxis(data, userSelectID);
SelectYAxis(data, userSelectID);
if (show_num == count && start_num == 0) //只做到篩選ID，顯示全部資料，初始值為第一筆開始
{
for (int i = 0; i < count - 3; i++)
{
var X1 = x[i + 1] - x[i];
var X2 = x[i + 2] - x[i];
var Y1 = y[i + 1] - y[i];
var Y2 = y[i + 2] - y[i];
vec[i] = X1 * Y2 - Y1 * X2;
if (vec[i] > 0)
{
counterclockwise++;
}
else if (vec[i] < 0)
{
clockwise++;
}
}
}
else if (show_num != 0 && start_num == 0) //顯示筆數不為0，起始值為初始
{
for (int i = 0; i < show_num - 3; i++)
{
var X1 = x[i + 1] - x[i];
var X2 = x[i + 2] - x[i];
var Y1 = y[i + 1] - y[i];
var Y2 = y[i + 2] - y[i];
vec[i] = X1 * Y2 - Y1 * X2;
if (vec[i] > 0)
{
counterclockwise++;
}
else if (vec[i] < 0)
{
clockwise++;
}
}
}
else if (show_num == 0) //無限制顯示筆數
{
for (int i = 0; i < count - 3; i++)
{
var X1 = x[i + 1] - x[i];
var X2 = x[i + 2] - x[i];
var Y1 = y[i + 1] - y[i];
var Y2 = y[i + 2] - y[i];
vec[i] = X1 * Y2 - Y1 * X2;
if (vec[i] > 0)
{
counterclockwise++;
}
else if (vec[i] < 0)
{
clockwise++;
}
}
}
else if (show_num != 0 && start_num != 0) //顯示筆數不為0，起始不為初始值
{
if (start_num + show_num - 1 <= count) //在資料筆數內
{
for (int i = start_num - 1; i < start_num + show_num - 3; i++)
{
var X1 = x[i + 1] - x[i];
var X2 = x[i + 2] - x[i];
var Y1 = y[i + 1] - y[i];
var Y2 = y[i + 2] - y[i];
vec[i] = X1 * Y2 - Y1 * X2;
if (vec[i] > 0)
{
counterclockwise++;
}
else if (vec[i] < 0)
{
clockwise++;
}
}
}
else //在資料筆數外
{
for (int i = start_num - 1; i < count - 3; i++)
{
var X1 = x[i + 1] - x[i];
var X2 = x[i + 2] - x[i];
var Y1 = y[i + 1] - y[i];
var Y2 = y[i + 2] - y[i];
vec[i] = X1 * Y2 - Y1 * X2;
if (vec[i] > 0)
{
counterclockwise++;
}
else if (vec[i] < 0)
{
clockwise++;
}
}
}
}
else if (show_num == 0 && start_num != 0) //無限制筆數，限制起始值
{
for (int i = start_num - 1; i < count - 3; i++)
{
var X1 = x[i + 1] - x[i];
var X2 = x[i + 2] - x[i];
var Y1 = y[i + 1] - y[i];
var Y2 = y[i + 2] - y[i];
vec[i] = X1 * Y2 - Y1 * X2;
if (vec[i] > 0)
{
counterclockwise++;
}
else if (vec[i] < 0)
{
clockwise++;
}
}
}
Data.VecInfo vecInfo = new Data.VecInfo
{
clockwise = clockwise,
counterclockwise = counterclockwise,
};
return(new Tuple <Data.VecInfo>(vecInfo));
}