{*****************************************}
{以下是逐点比较发生成直线的算法, }
{如有建议或意见,请与我联系.QQ:287179523 }
{Email:[email protected] }
{Copy Right (c) 2003-2004 Reserved. }
{*****************************************}
unit uniteline;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;
type
Tlinefrm = class(TForm)
StaticText1: TStaticText;
StaticText2: TStaticText;
input1: TEdit;
input2: TEdit;
input3: TEdit;
input4: TEdit;
Button1: TButton;
GroupBox1: TGroupBox;
Image1: TImage;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure input1KeyPress(Sender: TObject; var Key: Char);
procedure input2KeyPress(Sender: TObject; var Key: Char);
procedure input3KeyPress(Sender: TObject; var Key: Char);
procedure input4KeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations }
public
{ Public declarations }
end;
var
linefrm: Tlinefrm;
implementation
{$R *.dfm}
procedure Tlinefrm.Button1Click(Sender: TObject);
//说明,我的第一点取(x0+1,y0);并且在第一象限内
var
i,j,x0,y0,xe,ye,x,y,n,n1,n2:integer;
f:array[1..1024] of integer;
begin
linefrm.GroupBox1.Visible:=true;
linefrm.GroupBox1.Align:=alclient;
j:=1;
x0:=strtoint(input1.Text);
y0:=strtoint(input2.Text);
xe:=strtoint(input3.Text);
ye:=strtoint(input4.Text);
x:=x0+1;
y:=y0;
n1:=xe-x0;
n2:=ye-y0;
//fm:=ym*xa-ya*xm=>f1:=-y1 point(1,0)
f[1]:=0-ye;
n:=n1+n2;
for i:=0 to n-1 do
begin
linefrm.Image1.Canvas.Pixels[x,y]:=clred;
if f[j]<0 then
begin
y:=y+1;j:=j+1;
f[j+1]:=f[j]+xe;
end
else if f[j]>=0 then
begin
j:=j+1;
f[j+1]:=f[j]-ye;
x:=x+1;
end;
end;
end;
procedure Tlinefrm.FormCreate(Sender: TObject);
begin
linefrm.Left:=0;
linefrm.Top:=0;
linefrm.Width:=600;
linefrm.Height:=450
end;
procedure Tlinefrm.input1KeyPress(Sender: TObject; var Key: Char);
begin
if ord(key)=13 then
input2.SetFocus;
end;
procedure Tlinefrm.input2KeyPress(Sender: TObject; var Key: Char);
begin
if key=#13 then
input3.SetFocus;
end;
procedure Tlinefrm.input3KeyPress(Sender: TObject; var Key: Char);
begin
if key=#13 then
input4.SetFocus;
end;
procedure Tlinefrm.input4KeyPress(Sender: TObject; var Key: Char);
begin
if key=#13 then
button1.SetFocus;
end;
end. 
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