问题: 如何任意旋转图形?100分,在线等待,急!!! ( 积分: 100 )
分类: 图形图象
来自: majiade, 时间: 2004-08-22 23:50:00, ID: 2774004
如何任意旋转图形?
来自: cqbaobao, 时间: 2004-08-23 0:06:11, ID: 2774008
摘自 janFx.pas
procedure SmoothRotate(var Src, Dst: TBitmap; cx, cy: Integer;
Angle: Extended);
type
TFColor = record b, g, r: Byte end;
var
Top,
Bottom,
Left,
Right,
eww, nsw,
fx, fy,
wx, wy: Extended;
cAngle,
sAngle: Double;
xDiff,
yDiff,
ifx, ify,
px, py,
ix, iy,
x, y: Integer;
nw, ne,
sw, se: TFColor;
P1, P2, P3: Pbytearray;
begin
Angle := angle;
Angle := -Angle * Pi / 180;
sAngle := Sin(Angle);
cAngle := Cos(Angle);
xDiff := (Dst.Width - Src.Width) div 2;
yDiff := (Dst.Height - Src.Height) div 2;
for y := 0 to Dst.Height - 1 do
begin
P3 := Dst.scanline[y];
py := 2 * (y - cy) + 1;
for x := 0 to Dst.Width - 1 do
begin
px := 2 * (x - cx) + 1;
fx := (((px * cAngle - py * sAngle) - 1) / 2 + cx) - xDiff;
fy := (((px * sAngle + py * cAngle) - 1) / 2 + cy) - yDiff;
ifx := Round(fx);
ify := Round(fy);
if (ifx > -1) and (ifx < Src.Width) and (ify > -1) and (ify < Src.Height) then
begin
eww := fx - ifx;
nsw := fy - ify;
iy := TrimInt(ify + 1, 0, Src.Height - 1);
ix := TrimInt(ifx + 1, 0, Src.Width - 1);
P1 := Src.scanline[ify];
P2 := Src.scanline[iy];
nw.r := P1[ifx * 3];
nw.g := P1[ifx * 3 + 1];
nw.b := P1[ifx * 3 + 2];
ne.r := P1[ix * 3];
ne.g := P1[ix * 3 + 1];
ne.b := P1[ix * 3 + 2];
sw.r := P2[ifx * 3];
sw.g := P2[ifx * 3 + 1];
sw.b := P2[ifx * 3 + 2];
se.r := P2[ix * 3];
se.g := P2[ix * 3 + 1];
se.b := P2[ix * 3 + 2];
Top := nw.b + eww * (ne.b - nw.b);
Bottom := sw.b + eww * (se.b - sw.b);
P3[x * 3 + 2] := IntToByte(Round(Top + nsw * (Bottom - Top)));
Top := nw.g + eww * (ne.g - nw.g);
Bottom := sw.g + eww * (se.g - sw.g);
P3[x * 3 + 1] := IntToByte(Round(Top + nsw * (Bottom - Top)));
Top := nw.r + eww * (ne.r - nw.r);
Bottom := sw.r + eww * (se.r - sw.r);
P3[x * 3] := IntToByte(Round(Top + nsw * (Bottom - Top)));
end;
end;
end;
end;
来自: cqbaobao, 时间: 2004-08-23 0:20:17, ID: 2774011
补充:
function TrimInt(i, Min, Max: Integer): Integer;
begin
if i > Max then Result := Max
else if i < Min then Result := Min
else Result := i;
end;
function IntToByte(i: Integer): Byte;
begin
if i > 255 then Result := 255
else if i < 0 then Result := 0
else Result := i;
end;
注意:
只适用于 24 位色图
示例:
procedure TForm1.Button1Click(Sender: TObject);
var
bmp, bmpD: TBitmap;
begin
bmp := TBitmap.Create;
bmpD := TBitmap.Create;
bmp.LoadFromFile('C:/000000.bmp');
bmpD.PixelFormat := bmp.PixelFormat;
bmpD.Width := bmp.Width;
bmpD.Height := bmp.Height;
SmoothRotate(bmp, bmpD, 100, 100, 15); // 100, 100 为中心位置
Canvas.Draw(0, 0, bmpD);
bmp.Free;
bmpD.Free;
end;
来自: majiade, 时间: 2004-08-23 0:24:55, ID: 2774013
TrimInt()函数是什么?
来自: majiade, 时间: 2004-08-23 0:38:06, ID: 2774015
非常感谢!!
得分大富翁: cqbaobao