本例測試圖:
本例代碼:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormPaint(Sender: TObject);
procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
procedure FormResize(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses GdiPlus;
var
Path1,Path2,Path3: IGPGraphicsPath;
Pen: IGPPen;
procedure TForm1.FormCreate(Sender: TObject);
var
R: TRect;
begin
Pen := TGPPen.Create($FFFF0000, 3);
Path1 := TGPGraphicsPath.Create;
Path2 := TGPGraphicsPath.Create;
Path3 := TGPGraphicsPath.Create;
Path1.AddLine(0, 0, ClientWidth, ClIEntHeight);
R := ClIEntRect;
InflateRect(R, -ClientWidth div 3, -ClIEntHeight div 3);
OffsetRect(R, -Trunc((R.Right-R.Left) * 0.6), -Trunc((R.Bottom-R.Top) * 0.6));
Path2.AddRectangle(TGPRect.Create(R));
OffsetRect(R, R.Right-R.Left, R.Bottom-R.Top);
Path3.AddEllipse(TGPRect.Create(R));
end;
procedure TForm1.FormPaint(Sender: TObject);
var
Graphics: IGPGraphics;
begin
Graphics := TGPGraphics.Create(Handle);
with Graphics do
begin
DrawPath(Pen, Path1);
DrawPath(Pen, Path2);
DrawPath(Pen, Path3);
end;
end;
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
var
Pt: TGPPoint;
str: string;
begin
Pt.Initialize(X, Y);
str := '';
if Path2.IsVisible(Pt) then str := '在矩形內';
if Path3.IsVisible(Pt) then str := '在橢圓內';
if Path1.IsOutlineVisible(Pt, Pen) then str := '在直線上';
if Path2.IsOutlineVisible(Pt, Pen) then str := '在矩形的邊線上';
if Path3.IsOutlineVisible(Pt, Pen) then str := '在橢圓的圓周線上';
if Text <> str then Text := str;
end;
procedure TForm1.FormResize(Sender: TObject);
begin
OnCreate(Sender);
Repaint;
end;
end.