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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[69]: 路徑畫刷(9) - SetInterpolationColors 與 SetSurroundColors 的區別

再學 GDI+[69]: 路徑畫刷(9) - SetInterpolationColors 與 SetSurroundColors 的區別

編輯:Delphi

本例效果圖:

再學 GDI+[69]: 路徑畫刷(9) - SetInterpolationColors 與 SetSurroundColors 的區別

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, ComCtrls, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
const
 colors: array[0..3] of TGPColor = (aclRed, aclYellow, aclGreen, aclBlue);
 pos: array[0..3] of Single = (0.0, 0.2, 0.6, 1.0); {好像兩端數據必須要是 0 和 1}
var
 g: TGPGraphics;
 path: TGPGraphicsPath;
 pb: TGPPathGradIEntBrush;
 num: Integer;
 pts: array of TGPPoint;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 path := TGPGraphicsPath.Create;
 {建立橢圓路徑, 並根據路徑建立路徑畫刷, 再用 SetInterpolationColors 設置顏色}
 path.AddEllipse(MakeRect(10,10,150,150));
 pb := TGPPathGradIEntBrush.Create(path);
 pb.SetInterpolationColors(@colors, @pos, Length(pos));
 g.FillPath(pb, path);
 {根據橢圓路徑建立路徑畫刷, 再用 SetSurroundColors 設置顏色}
 pb.Free;
 pb := TGPPathGradIEntBrush.Create(path);
 num := Length(pos);
 pb.SetSurroundColors(@colors, num);
 g.TranslateTransform(160, 0);
 g.FillPath(pb, path);
 {根據從橢圓路徑中提取出的點數組建立路徑畫刷, 再用 SetSurroundColors 設置顏色}
 SetLength(pts, path.GetPointCount);
 path.GetPathPoints(PGPPoint(pts), Length(pts));
 pb.Free;
 pb := TGPPathGradIEntBrush.Create(PGPPoint(pts), Length(pts));
 pb.SetCenterColor(aclWhite); {此時中心會默認黑色, 我想要白色的}
 num := Length(colors);
 pb.SetSurroundColors(@colors, num);
 g.TranslateTransform(160, 0);
 g.FillPath(pb, path);
 {根據從橢圓路徑中提取出的點數組建立路徑畫刷, 再用 SetInterpolationColors 設置顏色}
// SetLength(pts, path.GetPointCount);
// path.GetPathPoints(PGPPoint(pts), Length(pts));
 pb.Free;
 pb := TGPPathGradIEntBrush.Create(PGPPoint(pts), Length(pts));
// pb.SetCenterColor(aclWhite); {這裡不需要中心色}
 num := Length(colors);
 pb.SetInterpolationColors(@colors, @pos, Length(pos));
 g.TranslateTransform(160, 0);
 g.FillPath(pb, path);
 pb.Free;
 path.Free;
 g.Free;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 169
 ClIEntWidth = 649
 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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