Как использовать anti-aliasing?
Как использовать anti-aliasing?
{The parameter "percent" needs an integer between 0 and 100 (include zero and 100). If "Percent" is 0, there will be no effect. If it's 100 there will be the strongest effect.}
procedure Antialising(C: TCanvas; Rect: TRect; Percent: Integer);
var
l, p: Integer;
R, G, B: Integer;
R1, R2, G1, G2, B1, B2: Byte;
begin
with c do
begin
Brush.Style := bsclear;
lineto(200, 100);
moveto(50, 150);
Ellipse(50, 150, 200, 30);
for l := Rect.Top to Rect.Bottom do
begin
for p := Rect.Left to Rect.Right do
begin
R1 := GetRValue(Pixels[p, l]);
G1 := GetGValue(Pixels[p, l]);
B1 := GetBValue(Pixels[p, l]);
//Pixel links
//Pixel left
R2 := GetRValue(Pixels[p - 1, l]);
G2 := GetGValue(Pixels[p - 1, l]);
B2 := GetBValue(Pixels[p - 1, l]);
if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
Pixels[p - 1, l] := RGB(R, G, B);
end;
//Pixel rechts
//Pixel right
R2 := GetRValue(Pixels[p + 1, l]);
G2 := GetGValue(Pixels[p + 1, l]);
B2 := GetBValue(Pixels[p + 1, l]);
if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
Pixels[p + 1, l] := RGB(R, G, B);
end;
//Pixel oben
//Pixel up
R2 := GetRValue(Pixels[p, l - 1]);
G2 := GetGValue(Pixels[p, l - 1]);
B2 := GetBValue(Pixels[p, l - 1]);
if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
Pixels[p, l - 1] := RGB(R, G, B);
end;
//Pixel unten
//Pixel down
R2 := GetRValue(Pixels[p, l + 1]);
G2 := GetGValue(Pixels[p, l + 1]);
B2 := GetBValue(Pixels[p, l + 1]);
if (R1 <> R2) or (G1 <> G2) or (B1 <> B2) then
begin
R := Round(R1 + (R2 - R1) * 50 / (Percent + 50));
G := Round(G1 + (G2 - G1) * 50 / (Percent + 50));
B := Round(B1 + (B2 - B1) * 50 / (Percent + 50));
Pixels[p, l + 1] := RGB(R, G, B);
end;
end;
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
Antialising(Image1.Canvas, Image1.Canvas.ClipRect, 100);
end;
Взято с сайта