円の接線の方程式の算出

Namespace: fvalgcli
Assembly: fvalgcli (in fvalgcli.dll) Version: 3.1.0.0 (3.1.0.11)

Syntax

C#
public static int fnFIE_cg_calc_tangent_line(
	DPNT_T pnt,
	DPNT_T center,
	double radius,
	ref DLINE_T line
)
Visual Basic
Public Shared Function fnFIE_cg_calc_tangent_line ( 
	pnt As DPNT_T,
	center As DPNT_T,
	radius As Double,
	ByRef line As DLINE_T
) As Integer

Parameters

pnt
Type: fvalgcli..::..DPNT_T
円上にある点P1
center
Type: fvalgcli..::..DPNT_T
円の中心座標C1
radius
Type: System..::..Double
円の半径r
line
Type: fvalgcli..::..DLINE_T%
接線L

Return Value

Type: Int32
以下のエラーコードを返します。

エラーコード：
f_err内容
F_ERR_NONE正常終了
F_ERR_INVALID_PARAM 不正なパラメータが渡された
F_ERR_CALC_IMPOSSIBLE 計算不能エラー
F_ERR_NO_LICENCEライセンスエラー、または未初期化エラー

Remarks

Examples

C# Copy imageCopy
//    $Revision: 1.1 $

using System;
using System.Collections.Generic;
using System.Text;
using fvalgcli;

namespace TC
{
    public partial class FIE
    {
        [FvPluginExecute]
        public void fnFIE_cg_calc_tangent_line()
        {
            int status = (int)f_err.F_ERR_NONE;

            DPNT_T pnt = new DPNT_T();
            DPNT_T center = new DPNT_T();
            double radius = 50.0;
            DLINE_T line = new DLINE_T();

            DLINE_T ans_line = DLINE_T.init(0.75, 1, -287.5);

            pnt.x = 170;
            pnt.y = 160;
            center.x = 200;
            center.y = 200;

            status = api.fnFIE_cg_calc_tangent_line(pnt, center, radius, ref line);

            Assert.IsTrue(status == (int)f_err.F_ERR_NONE, "エラーが発生しました。({0})", (f_err)status);

            // 結果を出力する.
            ConsoleOut.WriteFunctionName(":\n");
            Console.WriteLine("line.a = {0}", line.a);
            Console.WriteLine("line.b = {0}", line.b);
            Console.WriteLine("line.c = {0}", line.c);
            Console.Write(" ...");
            ConsoleOut.IsTrue(line.a == ans_line.a);
        }
    }
}

Visual Basic Copy imageCopy
'    $Revision: 1.1 $

Imports System.Collections.Generic
Imports System.Text
Imports fvalgcli

Public Partial Class FIE
    <FvPluginExecute> _
    Public Sub fnFIE_cg_calc_tangent_line()
        Dim status As Integer = CInt(f_err.F_ERR_NONE)

        Dim pnt As New DPNT_T()
        Dim center As New DPNT_T()
        Dim radius As Double = 50.0
        Dim line As New DLINE_T()

        Dim ans_line As DLINE_T = DLINE_T.init(0.75, 1, -287.5)

        pnt.x = 170
        pnt.y = 160
        center.x = 200
        center.y = 200

        status = api.fnFIE_cg_calc_tangent_line(pnt, center, radius, line)

        Assert.IsTrue(status = CInt(f_err.F_ERR_NONE), "エラーが発生しました。({0})", CType(status, f_err))

        ' 結果を出力する.
        ConsoleOut.WriteFunctionName(":" & vbLf)
        Console.WriteLine("line.a = {0}", line.a)
        Console.WriteLine("line.b = {0}", line.b)
        Console.WriteLine("line.c = {0}", line.c)
        Console.Write(" ...")
        ConsoleOut.IsTrue(line.a = ans_line.a)
    End Sub
End Class

See Also