再学 GDI+[54]: 路径 - Transform

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ComCtrls, StdCtrls, ExtCtrls;

type
TForm1 = class(TForm)
Panel1: TPanel;
Button1: TButton;
TrackBar1: TTrackBar;
TrackBar2: TTrackBar;
TrackBar3: TTrackBar;
TrackBar4: TTrackBar;
TrackBar5: TTrackBar;
TrackBar6: TTrackBar;
PaintBox1: TPaintBox;
procedure FormCreate(Sender: TObject);
procedure TrackBar1Change(Sender: TObject);
procedure TrackBar2Change(Sender: TObject);
procedure TrackBar3Change(Sender: TObject);
procedure TrackBar4Change(Sender: TObject);
procedure TrackBar5Change(Sender: TObject);
procedure TrackBar6Change(Sender: TObject);
procedure PaintBox1Paint(Sender: TObject);
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

uses GDIPOBJ, GDIPAPI;

procedure TForm1.FormCreate(Sender: TObject);
const
n = 40;
begin
TrackBar1.Min := -n;
TrackBar1.Max := n;
TrackBar2.Min := -n;
TrackBar2.Max := n;
TrackBar3.Min := -n;
TrackBar3.Max := n;
TrackBar4.Min := -n;
TrackBar4.Max := n;
TrackBar5.Min := -n;
TrackBar5.Max := n;
TrackBar6.Min := -n;
TrackBar6.Max := n;

TrackBar1.Position := 10;
TrackBar2.Position := 0;
TrackBar3.Position := 0;
TrackBar4.Position := 10;
TrackBar5.Position := 0;
TrackBar6.Position := 0;

Button1.OnClick := FormCreate;
end;

procedure TForm1.PaintBox1Paint(Sender: TObject);
var
g: TGPGraphics;
p: TGPPen;
b: TGPBrush;
path: TGPGraphicsPath;
matrix: TGPMatrix;
fontFamily: TGPFontFamily;
StringFormat: TGPStringFormat;
rect: TGPRect;
begin
rect := MakeRect(20, 20, 180, 120);

g := TGPGraphics.Create(PaintBox1.Canvas.Handle);
p := TGPPen.Create(aclYellowGreen, 1);
b := TGPHatchBrush.Create(HatchStyleSmallGrid, aclSilver, aclYellowGreen);
fontFamily := TGPFontFamily.Create('Arial Black');
StringFormat := TGPStringFormat.Create;
StringFormat.SetAlignment(StringAlignmentCenter);
StringFormat.SetLineAlignment(StringAlignmentCenter);

path := TGPGraphicsPath.Create;
path.AddRectangle(rect);
path.AddEllipse(rect);
path.AddString('ABC', -1, fontFamily, FontStyleRegular, 60, rect, StringFormat);

matrix := TGPMatrix.Create;
matrix.SetElements(TrackBar1.Position / 10,
TrackBar2.Position / 10,
TrackBar3.Position / 10,
TrackBar4.Position / 10,
TrackBar5.Position * 10,
TrackBar6.Position * 10);

path.Transform(matrix);

g.FillPath(b, path);
g.DrawPath(p, path);

path.Free;
StringFormat.Free;
fontFamily.Free;
b.Free;
p.Free;
g.Free;
end;

procedure TForm1.TrackBar1Change(Sender: TObject);
begin
PaintBox1.Repaint;
end;

procedure TForm1.TrackBar2Change(Sender: TObject);
begin
PaintBox1.Repaint;
end;

procedure TForm1.TrackBar3Change(Sender: TObject);
begin
PaintBox1.Repaint;
end;

procedure TForm1.TrackBar4Change(Sender: TObject);
begin
PaintBox1.Repaint;
end;

procedure TForm1.TrackBar5Change(Sender: TObject);
begin
PaintBox1.Repaint;
end;

procedure TForm1.TrackBar6Change(Sender: TObject);
begin
PaintBox1.Repaint;
end;

end.

object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 172
ClientWidth = 336
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
Position = poDesktopCenter
OnCreate = FormCreate
PixelsPerInch = 96
TextHeight = 13
object PaintBox1: TPaintBox
Left = 0
Top = 0
Width = 237
Height = 172
Align = alClient
OnPaint = PaintBox1Paint
ExplicitLeft = 120
ExplicitTop = 48
ExplicitWidth = 105
ExplicitHeight = 105
end
object Panel1: TPanel
Left = 237
Top = 0
Width = 99
Height = 172
Align = alRight
TabOrder = 0
ExplicitLeft = 225
ExplicitHeight = 170
object Button1: TButton
Left = 14
Top = 10
Width = 75
Height = 25
Caption = #21021#22987#21270
TabOrder = 0
end
object TrackBar1: TTrackBar
Left = 0
Top = 37
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 1
OnChange = TrackBar1Change
end
object TrackBar2: TTrackBar
Left = 0
Top = 59
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 2
OnChange = TrackBar2Change
end
object TrackBar3: TTrackBar
Left = 0
Top = 81
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 3
OnChange = TrackBar3Change
end
object TrackBar4: TTrackBar
Left = 0
Top = 103
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 4
OnChange = TrackBar4Change
end
object TrackBar5: TTrackBar
Left = 0
Top = 125
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 5
OnChange = TrackBar5Change
end
object TrackBar6: TTrackBar
Left = 0
Top = 147
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 6
OnChange = TrackBar6Change
end
end
end