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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;
type
reel=extended;
TReelpoint=record
x,y:reel;
end;
Tgraphique=class(Tbitmap)
private
xo,yo,xmin,ymin,xmax,ymax,Gx,Gy,taillex,tailley:reel;
public
constructor Create(w,h:integer;x1,x2,y1,y2:reel);reintroduce;overload;
procedure tracerepere(penw:integer;coulpen,clfond:Tcolor);
procedure tracecourbe(trajectoire:array of TReelpoint);
Function ptinfo(x,y:reel):Tpoint;
end;
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormPaint(Sender: TObject);
procedure FormResize(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Déclarations privées }
courbe: array of TReelpoint;
graphique:TGraphique;
public
{ Déclarations publiques }
end;
function pt(x,y:reel):TReelpoint;
var
Form1: TForm1;
implementation
{$R *.dfm}
function pt(x,y:reel):TReelpoint;
begin
result.x:=x;
result.y:=y;
end;
constructor Tgraphique.Create(w,h:integer;x1,x2,y1,y2:reel);
begin
inherited create;
width:=w;
height:=h;
xmin:=x1;
xmax:=x2;
ymin:=y1;
ymax:=y2;
taillex:=xmax-xmin;
tailley:=ymax-ymin;
Gx:=width/taillex;
Gy:=height/tailley;
xo:=-xmin*Gx;
yo:=ymax*Gy;
end;
procedure TGraphique.tracecourbe(trajectoire:array of TReelpoint);//tracé de la courbe à partir d'un tableau de points en coods mathématiques
var
traj:array of Tpoint;
i:integer;
begin
setlength(traj,length(trajectoire));
for i:=low(traj) to high(traj) do begin
traj[i]:=ptinfo(trajectoire[i].x,trajectoire[i].y);
end;
canvas.polyline(traj);
end;
Function TGraphique.ptinfo(x,y:reel):Tpoint;
begin
result:=point(round(xo+x*Gx),round(yo-y*Gy));
end;
procedure Tgraphique.tracerepere(penw:integer;coulpen,clfond:Tcolor); //tracé des axes
begin
with canvas do begin
pen.width:=penw;
pen.color:=coulpen;
brush.Color:=clfond;
fillrect(rect(0,0,width,height));
moveto(0,round(yo));
lineto(width,round(yo));
moveto(round(xo),0);
lineto(round(xo),height);
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
var i:integer;
begin
position:=poscreencenter;
clientwidth:=screen.height div 2;
clientheight:=screen.Height div 2;
setlength(courbe,101);
for i:= -50 to 50 do courbe[i+50]:= pt(i/10,sin(2*pi*i/50)); //TABLEAU DE POINTS EN COORDS MATHEMATIQUES
end;
procedure TForm1.FormPaint(Sender: TObject);
begin
with graphique do
begin
tracerepere(2,0,clwhite);
canvas.pen.width:=1;
canvas.Pen.color:=clred;
tracecourbe(courbe);
end;
canvas.Draw(0,0,graphique);
end;
procedure TForm1.FormResize(Sender: TObject);
begin
graphique:=TGraphique.Create(clientwidth,clientheight,-5,5,-1.2,1.2); //-5 ...+5 EN ABSCISSE et -1.2.......1.2 EN ORDONNEE
invalidate;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
graphique.Free;
end;
end. |
