unit1.~pas

TColor到RGB色的渐变

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Edit6: TEdit;
    Button1: TButton;
    edit1: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  i,j,ColorR,ColorG,ColorB:integer;
  Colorarea:Trect;
begin
  j:=form1.Height;
  ColorR:=STRTOINT(edit1.text);
  ColorG:=strtoint(edit2.Text);
  ColorB:=strtoint(edit3.Text);
  for i:=strtoint(edit5.Text) to strtoint(edit6.Text) do
   begin
    if edit4.Text='R' then
    ColorR:=i
    else if edit4.Text='G' then
    ColorG:=i
    else if edit4.Text='B'  then
    ColorB:=i;
    Canvas.Brush.Color:=RGB(ColorR,ColorG,ColorB);
    Colorarea:=rect(i*2,0,(i+1)*2,j);
    canvas.FillRect(Colorarea);
   end;

end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  showmessage('欢迎使用本程序 作者：LLK');
end;

end.