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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[51]: 路徑 - IsVisible、IsOutlineVisible

再學GDI+[51]: 路徑 - IsVisible、IsOutlineVisible

編輯:Delphi

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs;
type
 TForm1 = class(TForm)
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 path1,path2,path3: TGPGraphicsPath;
 p: TGPPen;
procedure TForm1.FormCreate(Sender: TObject);
var
 r: TRect;
begin
 path1 := TGPGraphicsPath.Create;
 path2 := TGPGraphicsPath.Create;
 path3 := TGPGraphicsPath.Create;
 p := TGPPen.Create(aclRed, 3);
 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(MakeRect(r));
 OffsetRect(r, r.Right-r.Left, r.Bottom-r.Top);
 path3.AddEllipse(MakeRect(r));
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 path1.Free;
 path2.Free;
 path3.Free;
 p.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 g.DrawPath(p, path1);
 g.DrawPath(p, path2);
 g.DrawPath(p, path3);
 g.Free;
end;
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
 Y: Integer);
begin
 Text := '';
// if path1.IsVisible(MakePoint(X,Y)) then Text := '在 path1 內';
 if path2.IsVisible(MakePoint(X,Y)) then Text := '在矩形內';
 if path3.IsVisible(MakePoint(X,Y)) then Text := '在橢圓內';
 if path1.IsOutlineVisible(X, Y, p) then Text := '在直線上';
 if path2.IsOutlineVisible(X, Y, p) then Text := '在矩形的邊線上';
 if path3.IsOutlineVisible(X, Y, p) then Text := '在橢圓的圓周線上';
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 206
 ClientWidth = 339
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnDestroy = FormDestroy
 OnMouseMove = FormMouseMove
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end

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