学绘秀曲线图

偶然从 http://blog.csdn.net/hero82748274/archive/2010/02/10/5304386.aspx 看到了秀曲线图, 就用 GDI 模仿了一下; 如果用 GDI+ 绘制, 图形会细腻很多.

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procedure TForm1.FormPaint(Sender: TObject);var  i,j,num,X,Y: Integer;begin  num := 60;  X := 300;  Y := 300;  ClientWidth := 2 * X;  ClientHeight := 2 * Y;  Canvas.Pen.Width := 1;  Canvas.Pen.Color := clWhite;  Canvas.Brush.Color := clNavy;  Canvas.FillRect(ClientRect);  for i := 0 to num do for j := 0 to 1 do  begin    Canvas.MoveTo(X, i*10);    if i < 30 then      if j = 0 then Canvas.LineTo(X-i*10, Y) else Canvas.LineTo(X+i*10, Y)    else      if j = 0 then Canvas.LineTo(X-(num-1-i)*10, Y) else Canvas.LineTo(X+(num-1-i)*10, Y);  end;end;

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procedure TForm1.FormPaint(Sender: TObject);var  i,j,num,n,X,Y: Integer;  angle: Single;  pts: array of array of TPoint;begin  num := 20;  n := 6; { 改为 n := 11 就是成了下一个图形 }  angle := -2 * PI / n;  X := 210;  Y := 210;  ClientWidth := 2*X;  ClientHeight := 2*Y;  Canvas.Pen.Width := 1;  Canvas.Pen.Color := clWhite;  Canvas.Brush.Color := clNavy;  Canvas.FillRect(ClientRect);  SetLength(pts, n+1, num);  for i := 0 to n do  begin    for j := 0 to num-1 do    begin      pts[i,j] := Point(Trunc(j*10*Cos(angle*i)+X), Trunc(j*10*Sin(angle*i)+Y));      Canvas.MoveTo(pts[i,j].X, pts[i,j].Y);      if i = 0 then        Canvas.LineTo((num-j)*10+X, Y)      else        Canvas.LineTo(pts[i-1, num-1-j].X, pts[i-1, num-1-j].Y);    end;  end;end;

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