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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[22]: TGPLinearGradientBrush - 之一: TLinearGradientMode

再學 GDI+[22]: TGPLinearGradientBrush - 之一: TLinearGradientMode

編輯:Delphi

TGPLinearGradIEntBrush.Create(
 rect: TGPRect;      {線性漸變的界限}
 color1, color2: TGPColor; {線性漸變起始色與終止色}
 mode: TLinearGradIEntMode {漸變方向, 見下表}
);
TGPLinearGradIEntBrush.Create(
 rect: TGPRectF;
 color1, color2: TGPColor;
 mode: TLinearGradIEntMode
);
本例效果圖:

再學 GDI+[22]: TGPLinearGradientBrush - 之一: TLinearGradientMode

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, TeCanvas;
type
 TForm1 = class(TForm)
  ComboBox1: TComboBox;
  ButtonColor1: TButtonColor;
  ButtonColor2: TButtonColor;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ButtonColor1Click(Sender: TObject);
  procedure ButtonColor2Click(Sender: TObject);
  procedure ComboBox1Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, TypInfo;
procedure TForm1.FormCreate(Sender: TObject);
var
 i: Integer;
begin
 for i := 0 to 3 do
  ComboBox1.Items.Add(GetEnumName(TypeInfo(TLinearGradIEntMode), i));
 ComboBox1.ItemIndex := 1;
 ButtonColor1.Caption := '色1   ';
 ButtonColor2.Caption := '色2   ';
 ButtonColor1.SymbolColor := clYellow;
 ButtonColor2.SymbolColor := clRed;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 lb: TGPLinearGradIEntBrush;
 c1,c2: TGPColor;
 r: TGPRect;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 r := MakeRect(60, 40, ClientWidth - 120, ClIEntHeight - 50);
 c1 := ColorRefToARGB(ButtonColor1.SymbolColor);
 c2 := ColorRefToARGB(ButtonColor2.SymbolColor);
 lb := TGPLinearGradientBrush.Create(r, c1, c2, TLinearGradIEntMode(ComboBox1.ItemIndex));
 g.FillEllipse(lb, r);
 lb.Free;
 g.Free;
end;
procedure TForm1.ButtonColor1Click(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.ButtonColor2Click(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.ComboBox1Change(Sender: TObject);
begin
 Repaint;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 197
 ClIEntWidth = 309
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poScreenCenter
 OnCreate = FormCreate
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object ComboBox1: TComboBox
  Left = 113
  Top = 6
  Width = 192
  Height = 21
  ItemHeight = 13
  TabOrder = 0
  Text = 'ComboBox1'
  OnChange = ComboBox1Change
 end
 object ButtonColor1: TButtonColor
  Left = 5
  Top = 4
  Width = 49
  Caption = 'ButtonColor1'
  TabOrder = 1
  OnClick = ButtonColor1Click
 end
 object ButtonColor2: TButtonColor
  Left = 58
  Top = 4
  Width = 49
  Caption = 'ButtonColor2'
  TabOrder = 2
  OnClick = ButtonColor2Click
 end
end
線性漸變的方向參數:

Delphi 微軟 說明 LinearGradIEntModeHorizontal Horizontal 指定從左到右的漸變。 LinearGradIEntModeVertical Vertical 指定從上到下的漸變。 LinearGradIEntModeForwardDiagonal ForwardDiagonal 指定從左上到右下的漸變。 LinearGradIEntModeBackwardDiagonal BackwardDiagonal 指定從右上到左下的漸變。


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