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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Bitmap-Midpoint-circle-algorithm/Delphi/bitmap-midpoint-circle-algorithm.delphi Normal file
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procedure DrawCircle(Image: TImage; Radius: integer; Center: TPoint);
var T1,T2: integer;
var X,Y: integer;
var Cnt: integer;
procedure DrawPixels(X,Y: integer);
{Draw pixel into all 8 octents}
begin
Image.Canvas.Pixels[Center.X + x, Center.Y + y]:=clRed;
Image.Canvas.Pixels[Center.X - X, Center.Y + Y]:=clRed;
Image.Canvas.Pixels[Center.X + X, Center.Y - Y]:=clRed;
Image.Canvas.Pixels[Center.X - X, Center.Y - Y]:=clRed;
Image.Canvas.Pixels[Center.X + Y, Center.Y + X]:=clRed;
Image.Canvas.Pixels[Center.X - Y, Center.Y + X]:=clRed;
Image.Canvas.Pixels[Center.X + y, Center.Y - X]:=clRed;
Image.Canvas.Pixels[Center.X - Y, Center.Y - X]:=clRed;
end;
begin
Cnt:=0;
T1:= Radius div 32;
{Start on X-axis}
X:= Radius; Y:= 0;
repeat
begin
DrawPixels(X, Y);
Y:=Y + 1;
T1:=T1 + Y;
T2:=T1 - X;
if T2 >= 0 then
begin
T1:=T2;
X:=X - 1;
end;
Inc(Cnt);
end
until x < y;
Form1.Caption:=IntToStr(Cnt);
end;
procedure ShowBrezCircle(Image: TImage);
begin
{Draw three times to make line thicker}
DrawCircle(Image,100,Point(200,200));
DrawCircle(Image,99,Point(200,200));
DrawCircle(Image,98,Point(200,200));
Image.Invalidate;
end;