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delphi 图片缩小

2013-08-16 02:20:18| 分类： delphi xe4 | 标签： |举报 |字号大中小订阅

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var

bmp,backbmp:TBitmap;

begin

backbmp:=TBitmap.Create;

backbmp.Assign(Image1.Picture.Bitmap);

try

bmp:=TBitmap.Create;

bmp.PixelFormat:=pf24bit;

Image1.AutoSize:=True;

bmp.Width:=trunc(0.9*Image1.Width);

bmp.Height:=trunc(0.9*Image1.Height);

//保持最大限度不失真

SetStretchBltMode(bmp.Canvas.Handle,HALFTONE);

StretchBlt(bmp.Canvas.Handle,0,0,bmp.Width,bmp.Height,

backbmp.Canvas.Handle,0,0,backbmp.Width,backbmp.Height,SRCCOPY);

Image1.Picture.Bitmap.Assign(bmp);

Image1.Top:=Self.Height div 2-Image1.Height div 2;

Image1.Left:=Self.Width div 2-Image1.Width div 2;

bmp.PixelFormat:=pf24bit;

Self.Caption:='图象尺寸为：'+IntToStr(Image1.Width)+'*'+IntToStr(Image1.Height);

bmp.Free;

except

end;

backbmp.Free;

backbmp:=nil;

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              blogAbstract:'<div\>var</div\><div\>bmp,backbmp:TBitmap;</div\><div\>begin</div\><div\>backbmp:=TBitmap.Create;</div\><div\>backbmp.Assign(Image1.Picture.Bitmap);</div\><div\>try</div\><div\>  bmp:=TBitmap.Create;</div\><div\>  bmp.PixelFormat:=pf24bit;</div\><div\>  Image1.AutoSize:=True;</div\><div\>  bmp.Width:=trunc(0.9*Image1.Width);</div\><div\>  bmp.Height:=trunc(0.9*Image1.Height);</div\><div\>  //保持最大限度不失真</div\>',
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    {if !!b&&b.length>0}
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<#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->

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