unit1.pas

输入平面上直线上采样的两个点坐标

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    Label1: TLabel;
    X1: TEdit;
    Button1: TButton;
    Label2: TLabel;
    Edit5: TEdit;
    GroupBox2: TGroupBox;
    Label3: TLabel;
    x: TEdit;
    Label4: TLabel;
    a1: TEdit;
    Label5: TLabel;
    b1: TEdit;
    Label6: TLabel;
    Label7: TLabel;
    y: TLabel;
    Button2: TButton;
    Label9: TLabel;
    X2: TEdit;
    Y1: TEdit;
    Y2: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
   a,b:double;
begin
   a:= (strtofloat(y2.Text)-strtofloat(y1.Text))/(strtofloat(x2.Text)-strtofloat(x1.Text));
   b:= strtofloat(y1.Text)-a*strtofloat(x1.Text);
   edit5.Text := 'y='+floattostr(a)+'x+'+floattostr(b);
   a1.Text :=floattostr(a);
   b1.Text :=floattostr(b);
end;

procedure TForm1.Button2Click(Sender: TObject);


begin
  y.caption :=floattostr(strtofloat(a1.text)*strtofloat(x.Text)+strtofloat(b1.text));

end;

end.