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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[67]: 路徑畫刷(7) - 畫個五角星

再學GDI+[67]: 路徑畫刷(7) - 畫個五角星

編輯:Delphi

本例效果圖:

代碼1:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
const
 pt: TPoint = (X:130; Y:130);
 r = 120;
 colors: array[0..0] of TGPColor = (aclRed);
var
 g: TGPGraphics;
 p: TGPPen;
 path: TGPGraphicsPath;
 pb: TGPPathGradientBrush;
 pts: array[0..4] of TGPPoint;
 radian: Single;
 i,num: Integer;
begin
 for i := 0 to 4 do
 begin
  radian := i * (360*2/5) * (Pi/180);
  pts[i].X := pt.X + Round(Sin(radian) * r);
  pts[i].Y := pt.Y - Round(Cos(radian) * r);
 end;
 g := TGPGraphics.Create(Canvas.Handle);
 path := TGPGraphicsPath.Create;
 path.AddPolygon(PGPPoint(@pts), Length(pts));
 pb:= TGPPathGradientBrush.Create(path);
 num := Length(colors);
 pb.SetSurroundColors(@colors, num);
 pb.SetCenterColor(aclYellow);
 {描個邊}
 p := TGPPen.Create(aclYellow);
 g.SetSmoothingMode(SmoothingModeAntiAlias);
 g.DrawPath(p, path);
 g.FillPath(pb, path);
 pb.Free;
 path.Free;
 p.Free;
 g.Free;
end;
end.

代碼2:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
const
 pt: TPoint = (X:130; Y:130);
 r = 120;
 colors: array[0..0] of TGPColor = (aclRed);
var
 g: TGPGraphics;
 p: TGPPen;
 path: TGPGraphicsPath;
 pb: TGPPathGradientBrush;
 pts: array[0..9] of TGPPoint;
 radian: Single;
 i,num: Integer;
 rx: Single;
begin
 for i := 0 to 9 do
 begin
  rx := r;
  if Odd(i) then rx := r * (1- (Sqrt(5)-1)/2); {(Sqrt(5)-1)/2 是黃金分割點, 約為 0.618}
  radian := i * (360/10) * (Pi/180);
  pts[i].X := pt.X + Round(Sin(radian) * rx);
  pts[i].Y := pt.Y - Round(Cos(radian) * rx);
 end;
 g := TGPGraphics.Create(Canvas.Handle);
 path := TGPGraphicsPath.Create;
 path.AddPolygon(PGPPoint(@pts), Length(pts));
 pb:= TGPPathGradientBrush.Create(path);
 num := Length(colors);
 pb.SetSurroundColors(@colors, num);
 pb.SetCenterColor(aclYellow);
 {描個邊}
 p := TGPPen.Create(aclYellow);
 g.SetSmoothingMode(SmoothingModeAntiAlias);
 g.DrawPath(p, path);
 g.FillPath(pb, path);
 pb.Free;
 path.Free;
 p.Free;
 g.Free;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 238
 ClientWidth = 259
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end

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