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unit Unit1;
interface
.........
procedure zShowLine(sender :TObject);
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
var
currline, LineHeight:integer;
sItem:TStringList;
bmp:TBitMap;
bRect,R1:TRect;
iDc:HDC;
procedure TForm1.FormCreate(Sender: TObject);
begin
Timer1.Enabled:=False;
iDC:=GetDc(Panel1.handle);
Currline:=0;
end;
procedure TForm1.zShowLine(sender :TObject);
begin
zShowText;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
zShowLine(self);//显示字符串
//bitblt 转移矩形图 (目标句柄，LS x,y,宽，高，源句柄，LS x,y,光栅运算符）
BitBlt(iDc,0,0,Panel1.Width,Panel1.Height,
Bmp.Canvas.Handle,0,Currline,srcCopy); //改变currline可实现左移右移
Inc(Currline,1);
if Currline>=bRect.Bottom-panel1.Height+100 then
begin
Timer1.Enabled:=False;
Currline:=0;
end;
end;
procedure TForm1.zShowText;
var
ss:string;
ReadFile:TextFile;
begin
AssignFile(ReadFile,Edit1.Text);
Reset(ReadFile);
sItem:=TStringList.Create;
with sItem do
while not eof(ReadFile) do
begin
Readln(ReadFile,ss);
add(ss);
end;
CloseFile(ReadFile);
zBmpCreate;
sItem.Free;//释放串
end;
procedure TForm1.zBmpCreate; //创建图片
var
i,y:integer; //y
begin
if bmp<>nil then bmp.free;
bmp:=TBitMap.Create;
zSetBmp;
R1.Right:=bRect.Right;
R1.Bottom:=bRect.Bottom;
y:=Panel1.Height-100;
for i:=0 to sItem.Count-1 do // 从0到行数 循环显示图片
begin
R1.Top:=y;
R1.Bottom:=R1.Top+LineHeight;
//中对齐
DrawText(Bmp.Canvas.Handle,pChar(sItem),-1,R1,Dt_Center or Dt_Top);
//左对齐
//DrawText(Bmp.Canvas.Handle,pChar(sItem),-1,R1,Dt_Left or Dt_Top);
//右对齐
//DrawText(Bmp.Canvas.Handle,pChar(sItem),-1,R1,Dt_Right or Dt_Top);
Inc(y,LineHeight);
end;
end;
procedure TForm1.zSetBmp;
begin
zSetLineHeight;
with bRect do //Rect 矩形坐标(左上x,左下y,右上x,右下y)
begin
Top:=0;
Left:=0;
Right:=Panel1.Width;
Bottom:=LineHeight*sItem.Count+Height;//行高*行数+form高度
end;
with Bmp do
begin
Height:=bRect.Bottom+100;//图片高度
Width:=bRect.Right;
with Canvas do //canvas 画布
begin
FillRect(bRect);
Brush.Style:=bsClear;
end;
end;
end;
procedure TForm1.zSetLineHeight;
{设置行间隔}
var
Metrics:TTextMetric; //设置字体 API
begin
GetTextMetrics(iDc,Metrics);
LineHeight:=Metrics.tmHeight+Metrics.tmInternalLeading-Bmp.Canvas.Font.Height;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if Edit1.Text='' then
ShowMessage('请输入文件地址')
else
Timer1.Enabled:=not Timer1.Enabled;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
timer1.Enabled :=false;
Currline:=0;
Button2.Click;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
Timer1.Interval:=TrackBar1.Position*5;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
if Bmp<>nil then Bmp.Free;
end;
end.
