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tzh1
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以下这个使用后图象怎么不旋转？
procedure RotateBmp(bmp: TBitmap;
Center: TPoint;
angle: Integer);
var
tmpbmp: TBitmap;
i, j, x, y, px, py: Integer;
cAngle, sAngle: extended;
p1, p2: Pchar;
begin
while angle < 0do
angle := angle + 360;
angle := angle mod 360;
sAngle := sin(- angle * pi / 180);
cAngle := cos(- angle * pi / 180);
tmpbmp := tbitmap.create;
tmpbmp.assign(bmp);
for i := 0 to tmpbmp.height - 1do
begin
p1 := pchar(tmpbmp.scanline);
py := 2 * (i - center.y) - 1;
for j := 0 to tmpbmp.width - 1do
begin
px := 2 * (j - center.x) - 1;
x := (round(px * cAngle - py * sAngle) - 1) div 2 + center.x;
y := (round(px * sAngle + py * cAngle) - 1) div 2 + center.y;
if (x>=0) and (x=0) and (y<=tmpbmp.height) then
begin
p2 := pchar(bmp.scanline[y]) + x * 3;
move(p1^, p2^, 3);
end;
inc(p1, 3);
end;
end;
end;
procedure RotateBmp(bmp: TBitmap;
Center: TPoint;
angle: Integer);
var
tmpbmp: TBitmap;
i, j, x, y, px, py: Integer;
cAngle, sAngle: extended;
p1, p2: Pchar;
begin
while angle < 0do
angle := angle + 360;
angle := angle mod 360;
sAngle := sin(- angle * pi / 180);
cAngle := cos(- angle * pi / 180);
tmpbmp := tbitmap.create;
tmpbmp.assign(bmp);
for i := 0 to tmpbmp.height - 1do
begin
p1 := pchar(tmpbmp.scanline);
py := 2 * (i - center.y) - 1;
for j := 0 to tmpbmp.width - 1do
begin
px := 2 * (j - center.x) - 1;
x := (round(px * cAngle - py * sAngle) - 1) div 2 + center.x;
y := (round(px * sAngle + py * cAngle) - 1) div 2 + center.y;
if (x>=0) and (x=0) and (y<=tmpbmp.height) then
begin
p2 := pchar(bmp.scanline[y]) + x * 3;
move(p1^, p2^, 3);
end;
inc(p1, 3);
end;
end;
end;