delphi - 如何测试形状和面板是否在同一位置

Question

这个想法是你必须拍摄面板。因此面板将被设置到屏幕顶部的随机位置，然后向下移动到屏幕底部。您必须在面板到达底部之前用形状拍摄面板。但是我不知道如何测试创建的形状是否在面板的位置以重置面板。目前这是我的代码，但 if 测试为假。

unit Unit1;

interface

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

const
  MaxRays=100;
  RayStep=8;
type
   TForm1 = class(TForm)
   Panel1: TPanel;
    Timer1: TTimer;
    Timer2: TTimer;
    Button1: TButton;
    Shape1: TShape;
    Timer3: TTimer;
    Image1: TImage;
    procedure Timer2Timer(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure FormMouseWheelDown(Sender: TObject; Shift: TShiftState;
      MousePos: TPoint; var Handled: Boolean);
    procedure FormMouseWheelUp(Sender: TObject; Shift: TShiftState;
       MousePos: TPoint; var Handled: Boolean);
     procedure Timer3Timer(Sender: TObject);
    procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  private
    { Private declarations }
    Rays:array[0..MaxRays-1] of TShape;

   public
   procedure StartPanelAnimation1;
   procedure DoPanelAnimationStep1;
   function  PanelAnimationComplete1: Boolean;
   { Public declarations }
  end;

var
  Form1: TForm1;

implementation
 var key : char;
{$R *.dfm}

{ TForm1 }



 { TForm1 }

 procedure TForm1.DoPanelAnimationStep1;
begin
Panel1.Top := Panel1.Top+1;
end;

function TForm1.PanelAnimationComplete1: Boolean;
begin
 Result := Panel1.Top=512;
end;

procedure TForm1.StartPanelAnimation1;
begin
  Panel1.Top := 0;
  Timer1.Interval := 1;
  Timer1.Enabled := True;
end;

procedure TForm1.Timer2Timer(Sender: TObject);
begin
   DoPanelAnimationStep1;
   if PanelAnimationComplete1 then
    StartPanelAnimation1;
   if (shape1.Top < panel1.Top) and (shape1.Left < panel1.Left+104) and (shape1.Left >       panel1.Left)   then
   begin
    startpanelanimation1;
    sleep(10);
   end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
 button1.Hide;
  key := 'a';
  timer2.Enabled := true;
  StartPanelAnimation1; 
end;

procedure TForm1.FormActivate(Sender: TObject);
begin
 shape1.Visible := false;
 timer2.Enabled := false;
 end;

procedure TForm1.FormMouseWheelDown(Sender: TObject; Shift: TShiftState;
  MousePos: TPoint; var Handled: Boolean);
   begin
image1.Left := image1.Left-10;
end;

 procedure TForm1.FormMouseWheelUp(Sender: TObject; Shift: TShiftState;
  MousePos: TPoint; var Handled: Boolean);
    begin
    image1.Left := image1.Left+10;
   end;

procedure TForm1.Timer3Timer(Sender: TObject);
var
  i:integer;
begin
  for i:=0 to MaxRays-1 do
    if Rays[i]<>nil then
    begin
      Rays[i].Top:=Rays[i].Top-RayStep;
      if Rays[i].Top<0 then FreeAndNil(Rays[i]);
    end;
end;


procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
   var
   i:integer;
begin
  i:=0;
  while (i<MaxRays) and (Rays[i]<>nil) do inc(i);
  if i<MaxRays then
   begin
    Rays[i]:=TShape.Create(Self);
    Rays[i].Shape:=stEllipse;
    Rays[i].Pen.Color:=clRed;
    Rays[i].Pen.Style:=psSolid;
    Rays[i].Brush.Color:=clYellow;
    Rays[i].Brush.Style:=bsSolid;
    Rays[i].SetBounds(X-4,Y-20,9,41);
    Rays[i].Parent:=Self;
    end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  i:integer;
begin
  for i:=0 to MaxRays-1 do Rays[i]:=nil;
end;

end.

我已经尝试过@NGLN 所说的但是当我单击鼠标按钮时形状移动 10 个像素然后停止，当它停止时正常向下移动的面板现在在屏幕顶部疯狂移动更改其左侧位置但顶部位置保持为 0。

这是新代码

unit Unit1;

interface


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

  const
  MaxRays=100;
  RayStep=8;
type
  TForm1 = class(TForm)
    Panel1: TPanel;
    Timer1: TTimer;
    Timer2: TTimer;
    Button1: TButton;
    Shape1: TShape;
    Timer3: TTimer;
    Image1: TImage;
    Timer4: TTimer;
    procedure Timer2Timer(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure FormMouseWheelDown(Sender: TObject; Shift: TShiftState;
      MousePos: TPoint; var Handled: Boolean);
    procedure FormMouseWheelUp(Sender: TObject; Shift: TShiftState;
      MousePos: TPoint; var Handled: Boolean);
    procedure Timer3Timer(Sender: TObject);
    procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    Rays:array[0..MaxRays-1] of TShape;
  public
   procedure StartPanelAnimation1;
   procedure DoPanelAnimationStep1;
   function  PanelAnimationComplete1: Boolean;
   function EllipticShapeIntersectsPanel(Shape: TShape; Panel: TPanel): Boolean;
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
 var key : char;
{$R *.dfm}

{ TForm1 }



{ TForm1 }

procedure TForm1.DoPanelAnimationStep1;
begin
Panel1.Top := Panel1.Top+1;
end;

function TForm1.PanelAnimationComplete1: Boolean;
begin
 Result := Panel1.Top=512;
end;

procedure TForm1.StartPanelAnimation1;
var left : integer;
begin
  Panel1.Top := 0;
  randomize;
  left := random(clientwidth-105);
  panel1.Left := left;
  Timer1.Interval := 1;
   Timer1.Enabled := True;
end;

procedure TForm1.Timer2Timer(Sender: TObject);
 var I: Integer;
begin
 DoPanelAnimationStep1;
  if PanelAnimationComplete1 then
    StartPanelAnimation1;
   I := 0;
  while (Rays[I] <> nil) and (I < MaxRays)  do
  begin
    if EllipticShapeIntersectsPanel(Rays[I], Panel1) then
    Inc(I);
    startpanelanimation1;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
 button1.Hide;
 key := 'a';
 timer2.Enabled := true;
 StartPanelAnimation1;
end;

procedure TForm1.FormActivate(Sender: TObject);
begin
 shape1.Visible := false;
 timer2.Enabled := false;
end;

procedure TForm1.FormMouseWheelDown(Sender: TObject; Shift: TShiftState;
  MousePos: TPoint; var Handled: Boolean);
begin
image1.Left := image1.Left-10;
end;

procedure TForm1.FormMouseWheelUp(Sender: TObject; Shift: TShiftState;
  MousePos: TPoint; var Handled: Boolean);
begin
 image1.Left := image1.Left+10;
end;


procedure TForm1.Timer3Timer(Sender: TObject);
var
  i:integer;
begin
  for i:=0 to MaxRays-1 do
    if Rays[i]<>nil then
    begin
      Rays[i].Top:=Rays[i].Top-RayStep;
      if Rays[i].Top<0 then FreeAndNil(Rays[i]);
    end;
end;

procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
 var
  i:integer;
  left : integer;
  top : integer;
begin
  i:=0;
  while (i<MaxRays) and (Rays[i]<>nil) do i:= i+10;
  if i<MaxRays then
   begin
    Rays[i]:=TShape.Create(Self);
    Rays[i].Shape:=strectangle;;
    Rays[i].Pen.Color:=clRed;
    Rays[i].Pen.Style:=psSolid;
    Rays[i].Brush.Color:=clred;
    Rays[i].Brush.Style:=bsSolid;
    left := image1.Left+38;
    top := image1.Top-30;
    Rays[i].SetBounds(left,top,9,33);
    Rays[i].Parent:=Self;
   end;

end;

procedure TForm1.FormCreate(Sender: TObject);
begin
 Screen.Cursor:=crNone;
end;

function TForm1.EllipticShapeIntersectsPanel(Shape: TShape;
  Panel: TPanel): Boolean;
var
  ShapeRgn: HRGN;
begin
  with Shape.BoundsRect do
    ShapeRgn := CreateEllipticRgn(Left, Top, Right, Bottom);
  try
    Result := RectInRegion(ShapeRgn, Panel.BoundsRect);
  finally
    DeleteObject(ShapeRgn);
  end;
end;

end. 

Answer 1

因为你的形状是椭圆形的，创建一个临时区域并确定与矩形的交集 RectInRegion :

function EllipticShapeIntersectsPanel(Shape: TShape; Panel: TPanel): Boolean;
var
  ShapeRgn: HRGN;
begin
  with Shape.BoundsRect do
    ShapeRgn := CreateEllipticRgn(Left, Top, Right, Bottom);
  try
    Result := RectInRegion(ShapeRgn, Panel.BoundsRect);
  finally
    DeleteObject(ShapeRgn);
  end;
end;

(如果形状是rectangular，那么可以用Darthman的套路。)

现在将阵列中的每条光线馈送到此例程:

procedure TForm1.Timer2Timer(Sender: TObject);
var
  I: Integer;
begin
  ...
  I := 0;
  while (Rays[I] <> nil) and (I < MaxRays)  do
  begin
    if EllipticShapeIntersectsPanel(Rays[I], Panel1) then
      // Do what you want to do
    Inc(I);
  end;
end;