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| unit Unit5;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls;
type
TForm5 = class(TForm)
Pbi: TImage;
Pb: TPaintBox;
procedure PbPaint(Sender: TObject);
procedure PbMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure PbMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure PbMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure FormShow(Sender: TObject);
private
{ Private declarations }
OLDX,OLDY:integer;
OldAppMessage:TMessageEvent;
procedure AppMessage(var Msg: TMsg; var Handled: Boolean);
procedure Draw;
procedure CalcXYIJ(xx,yy:Extended;var ix:integer;var iy:integer);
procedure SetMinmax;
procedure Normalize;
public
{ Public declarations }
end;
var
Form5: TForm5;
//========ПРИМЕР====Треугольник
xa:array [0..2] of double=(1000,1100,1200);
ya:array [0..2] of double=(200,500,300);
//==============================
implementation
{$R *.dfm}
var
sw,sh:integer;
move:integer; //-----Движение картинкм
var cx,cy:Extended; //-----Координаты центра
var koeff:Extended;
var zoom:Extended; //-----Коэффициент увеличения (1...100)
minx,maxx,miny,maxy:Extended; //-------Макс и мин значения
procedure TForm5.Draw;
var i,i0,j0:integer;
Cc:TCanvas;
R:TRect;
begin
//-------------Канвас
Cc:=Pbi.Picture.Bitmap.Canvas;
Pbi.Picture.Bitmap.Width:=Pb.Width;
Pbi.Picture.Bitmap.Height:=Pb.Height;
Cc.Brush.Color:=clWhite;
Cc.Brush.Style:=bsSolid;
Cc.Pen.Style:=psSolid;
R.Top:=0;R.Left:=0;
R.Right:=Pbi.Width;
R.Bottom:=Pbi.Height;
Cc.FillRect(R);
//Здесь рисуем в циклах примитивы
//===============ПРИМЕР: треугольник
Cc.Pen.Color:=clRed;
CalcXYIJ(xa[0],ya[0],i0,j0);Cc.MoveTo(i0,j0);
CalcXYIJ(xa[1],ya[1],i0,j0);Cc.LineTo(i0,j0);
CalcXYIJ(xa[2],ya[2],i0,j0);Cc.LineTo(i0,j0);
CalcXYIJ(xa[0],ya[0],i0,j0);Cc.LineTo(i0,j0);
//==============================================
Pb.Canvas.CopyMode:=cmSrcCopy;
Pb.Canvas.CopyRect(R,Pbi.Picture.Bitmap.Canvas,R);
end;
procedure TForm5.FormCreate(Sender: TObject);
begin
OldAppMessage:=Application.OnMessage;
Application.OnMessage:=AppMessage;
end;
procedure TForm5.FormDestroy(Sender: TObject);
begin
Application.OnMessage:=OldAppMessage;
end;
procedure TForm5.FormShow(Sender: TObject);
begin
SetMinMax;
Normalize;
end;
procedure TForm5.CalcXYIJ(xx,yy:Extended;var ix:integer;var iy:integer);
begin
iy:=Trunc(sh div 2+(cy-yy)*koeff*zoom);
ix:=Trunc(sw div 2+(xx-cx)*koeff*zoom);
end;
procedure TForm5.Normalize;
var i,j:integer;
begin
//------------Нормирование
sw:=Screen.Width div 2;
sh:=Screen.Height div 2;
zoom:=1.0;cx:=(minx+maxx)/2;cy:=(miny+maxy)/2;
if (maxx-minx)/Pb.Width-20>(maxy-miny)/Pb.Height-20 then
begin //--------Нормируем по X
sw:=Pb.Width-20;
sh:=Pb.Height-20;
try koeff:=(Pb.Width-20)/(maxx-minx); except koeff:=1; end;
end
else
begin //--------Нормируем по Y
sh:=Pb.Height-20;
sw:=Pb.Width-20;
try koeff:=(Pb.Height-20)/(maxy-miny); except koeff:=1; end;
end;
end;
procedure TForm5.SetMinmax;
var i:integer;
begin
//---------МинМакс
minx:=1000000000.0;miny:=1000000000.0;
maxx:=-1000000000.0;maxy:=-1000000000.0;
// Цикл по всем ключевым точкам объектов
// ищем минимальное и максимальное x и y и записываем в minx,miny,maxx,maxy соответстенно
// ..................
//=====================ПРИМЕР - треугольник
for i:=0 to 2 do
begin
if xa[i]<minx then minx:=xa[i];
if ya[i]<miny then miny:=ya[i];
if xa[i]>maxx then maxx:=xa[i];
if ya[i]>maxy then maxy:=ya[i];
end;
//--------------------------------------
end;
procedure TForm5.PbMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
OLDX:=X;OLDY:=Y;Move:=1;
Draw;
end;
procedure TForm5.PbMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
var dx,dy:integer;
begin
if Move<>0 then
begin
dx:=X-OLDX;
dy:=Y-OLDY;
cx:=cx-dx/(koeff*zoom);
cy:=cy+dy/(koeff*zoom);
Draw;
OLDX:=X;OLDY:=Y;
end;
end;
procedure TForm5.PbMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
Move:=0;
Draw;
end;
procedure TForm5.PbPaint(Sender: TObject);
begin
Draw;
end;
procedure TForm5.AppMessage(var Msg: TMsg; var Handled: Boolean);
var i:smallint;
begin
if Msg.message=WM_MOUSEWHEEL then
begin
i:=HiWord(Msg.wParam);
if i>0 then zoom:=zoom*1.1 else zoom:=zoom/1.1;
Draw;
Handled:=True;
end;
end;
end. |
