http://www.delphi2007.net/DelphiMultimedia/html/delphi_20060929153916275.html
rt
要求效率比较高
谢谢
沙发
随便google下不都可以找一堆吗
procedure TForm1.RotateangleClick(Sender: TObject);
var
newbmp: TBitmap;
Bitmap: TBitmap;
angle: integer;
begin
newbmp := TBitmap.Create;
Bitmap := TBitmap.Create;
screen.Cursor := crhourglass;
newbmp.Assign(image1.Picture.Bitmap);
//newbmp.pixelFormat:=pf8bit;
//Bitmap.pixelFormat:=pf8bit;
angle := strtoint(inputbox(‘旋转位图’, ‘请输入旋转角度’, ’90’));
Bmp_Rotate(newbmp, bitmap, angle);
image1.picture.Bitmap.Assign(bitmap);
image1.Left := (self.Width div 2) – (bitmap.Width div 2);
image1.Top := (self.Height div 2) – (bitmap.Height div 2);
screen.Cursor := crdefault;
newbmp.Free;
Bitmap.Free;
end;
procedure Tform1.bmp_rotate(Srcbmp, DestBmp: Tbitmap; angle: extended);
var
c1x, c1y, c2x, c2y: integer;
p1x, p1y, p2x, p2y: integer;
radius, n: integer;
alpha: extended;
c0, c1, c2, c3: tcolor;
begin
if SrcBmp.Width > SrcBmp.Height then
begin
DestBmp.width := SrcBmp.Width;
DestBmp.height := SrcBmp.Width;
end
else
DestBmp.Width := SrcBmp.Height;
DestBmp.Height := SrcBmp.Height;
//将角度转换为PI值
angle := (angle / 180) * pi;
// 计算中心点,你可以修改它
c1x := SrcBmp.width div 2;
c1y := SrcBmp.height div 2;
c2x := DestBmp.width div 2;
c2y := DestBmp.height div 2;
// 步骤数值number
if c2x < c2y then
n := c2y
else
n := c2x;
dec(n, 1);
// 开始旋转
for p2x := 0 to n do
begin
for p2y := 0 to n do
begin
if p2x = 0 then
alpha := pi / 2
else
alpha := arctan2(p2y, p2x);
radius := round(sqrt((p2x * p2x) + (p2y * p2y)));
p1x := round(radius * cos(angle + alpha));
p1y := round(radius * sin(angle + alpha));
c0 := SrcBmp.canvas.pixels[c1x + p1x, c1y + p1y];
c1 := SrcBmp.canvas.pixels[c1x – p1x, c1y – p1y];
c2 := SrcBmp.canvas.pixels[c1x + p1y, c1y – p1x];
c3 := SrcBmp.canvas.pixels[c1x – p1y, c1y + p1x];
DestBmp.Canvas.pixels[c2x + p2x, c2y + p2y] := c0;
DestBmp.canvas.pixels[c2x – p2x, c2y – p2y] := c1;
DestBmp.canvas.pixels[c2x + p2y, c2y – p2x] := c2;
DestBmp.canvas.pixels[c2x – p2y, c2y + p2x] := c3;
end;
application.processmessages
end;
end;
用IMAGEEN控件可以做很多效果,并且速度很快
http://www.efg2.com/Lab/ImageProcessing/RotateScanline.htm
这个是用扫描线来做得 速度很快 自己看懂改下 就能用了
以上答案都正确
这么多分,我接!可以下一本<<delphi数字图象处理>>来看看!
发现个好组件:TRotateImage
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