画斜线出现锯齿怎么解决？

shaoguoqiang2002 2006-07-14 08:17:33

用下面的代码画椭圆和斜线都出现锯齿，请高手指教

PaintBox1.Canvas.Ellipse(100,100,200,200);
PaintBox1.Canvas.MoveTo(150,150);
PaintBox1.Canvas.LineTo(200,180);

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zhitaoyang 2006-09-06

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贴张图片上去算了

xzhifei 2006-09-04

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KAO，没看楼主的信誉就回答了，NND

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xzhifei 2006-09-04

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反走样线的画线函数

procedure AALine(x1,y1,x2,y2 : single; color : tcolor; canvas : tcanvas);
function CrossFadeColor(FromColor,ToColor : TColor; Rate : Single) : TColor;
var r,g,b : byte;
begin
r:=Round(GetRValue(FromColor)*Rate+GetRValue(ToColor)*(1-Rate));
g:=Round(GetGValue(FromColor)*Rate+GetGValue(ToColor)*(1-Rate));
b:=Round(GetBValue(FromColor)*Rate+GetBValue(ToColor)*(1-Rate));
Result:=RGB(r,g,b);
end;
procedure hpixel(x : single; y : integer);
var FadeRate : single;
begin
FadeRate:=x-trunc(x);
with canvas do
begin
pixels[trunc(x),y]:=CrossFadeColor(Color,Pixels[Trunc(x),y],1-FadeRate);
pixels[trunc(x)+1,y]:=CrossFadeColor(Color,Pixels[Trunc(x)+1,y],FadeRate);
end;
end;

procedure vpixel(x : integer; y : single);
var FadeRate : single;
begin
FadeRate:=y-trunc(y);
with canvas do
begin
pixels[x,trunc(y)]:=CrossFadeColor(Color,Pixels[x,Trunc(y)],1-FadeRate);
pixels[x,trunc(y)+1]:=CrossFadeColor(Color,Pixels[x,Trunc(y)+1],FadeRate);
end;
end;

var i : integer;
ly,lx,currentx,currenty,deltax,deltay,l,skipl : single;
begin
if (x1<>x2) or (y1<>y2) then
begin
currentx:=x1;
currenty:=y1;
lx:=abs(x2-x1);
ly:=abs(y2-y1);

if lx>ly then
begin
l:=trunc(lx);
deltay:=(y2-y1)/l;
if x1>x2 then
begin
deltax:=-1;
skipl:=(currentx-trunc(currentx));
end else
begin
deltax:=1;
skipl:=1-(currentx-trunc(currentx));
end;
end else
begin
l:=trunc(ly);
deltax:=(x2-x1)/l;
if y1>y2 then
begin
deltay:=-1;
skipl:=(currenty-trunc(currenty));
end else
begin
deltay:=1;
skipl:=1-(currenty-trunc(currenty));
end;
end;

currentx:=currentx+deltax*skipl;
currenty:=currenty+deltay*skipl;{}

for i:=1 to trunc(l) do
begin
if lx>ly then vpixel(trunc(currentx),currenty) else hpixel(currentx,trunc(currenty));
currentx:=currentx+deltax;
currenty:=currenty+deltay;
end;
end;
end;

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noelse520 2006-09-04