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(1)¡¢x' = x * cos(angle) + y * sin(andle)
y' = x * cos(andle) - y * sin(angle)
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(2)¡¢x = x' * cos(angle) - y * sin(angle)
y = y' * cos(angle) + y * sin(angle)
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// »ñÈ¡Width * HeightͼÏñÐýתAngleʱ£¬ÍêÈ«°üº¬Í¼ÏñËùÐè³ß´ç
function GetRotateSize(Width, Height: Integer; Angle: Single): TSize;
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procedure ImageRotate(Dest: TImageData; OffsetX, OffsetY: Integer;
const Source: TImageData; Angle: Single; IpMode: TInterpolateMode = imDefault); overload;
// ͼÏñ×ÔÉíÐýת£¬ÖÐÐĵãÔÚͼÏñµÄÖÐÑë
procedure ImageRotate(Data: TImageData; Angle: Single;
ColorBackground: LongWord = 0; IpMode: TInterpolateMode = imDefault); overload;
// °´È±Ê¡·½Ê½ÐýתͼÏñ£¨SourceÓëDest×óÉÏ±ß¶ÔÆë£©¡£
procedure ImageRotate(Dest: TImageData; const Source: TImageData;
Angle: Single; IpMode: TInterpolateMode = imDefault); overload;
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procedure ImageRotate(Dest: TImageData;
const Source: TGraphic; Angle: Single; IpMode: TInterpolateM
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