[programming]

пишу прогу соударение шаров.
аррр.. возникла еще проблема..

точнее 3..



1)не могу сделать так чтобы количество шаров вводилось при запуске программы.

в коде выдает ошибку.

2)прописала столкновение шаров.ошибку не выдает, но почему-то не работает_)

3)1 шар летает в форме, а потом куда-то улетает

код:


unit Unit1;

interface

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

const
MaxBalls=10;

Colors: array[0..4] of TColor = (clRed, clBlue, clLime, clYellow, clFuchsia);

type
TDirection=(dLeft,dUpleft,dupright,dright,
ddownright,ddownleft,ddown,dup);

TBall=record
Button1: TButton;
id:byte;
x,y,x1,y1:integer;
size:byte;
Direction:TDirection;
Speed:byte;
Color:TColor;
BorderColor:TColor;

end;

TForm1 = class(TForm)
Paint: TButton;
Timer1: TTimer;
PaintBox1: TPaintBox;
Edit1: TEdit;
Edit2: TEdit;
Edit3: TEdit;
Label1: TLabel;
Label2: TLabel;
Label3: TLabel;

procedure Timer1Timer(Sender: TObject);
procedure PaintClick(Sender: TObject);
procedure FormCreate(Sender: TObject);

private
procedure DrawBalls;

{ Private declarations }
public
{ Public declarations }

balls:array[1..MaxBalls] of TBall;

end;

var
Form1: TForm1;
MyBMP:TBitmap;
ball:TBall;
map_width, map_height: word;
j,i:integer;




implementation

{$R *.dfm}

procedure TForm1.DrawBalls;
var
i: integer;
begin

with MyBMP.Canvas do
begin
Brush.Color:=clWhite;
FillRect(ClipRect);
end;
for I := 1 to MaxBalls do
with balls[i] do
begin
MyBMP.Canvas.Pen.Color:=BorderColor;
MyBMP.Canvas.Brush.Color:=Color;
MyBMP.Canvas.ellipse(x-size,y-size,x+size,y+size);
end;
PaintBox1.Canvas.Draw(0,0,MyBMP);
end;

procedure TForm1.PaintClick(Sender: TObject);
var
i: integer;
//создаем шары
begin

randomize;
for I := 1 to MaxBalls do
with balls[i] do begin
id:=i;
size:=StrToint(Edit2.Text);
direction:=TDirection (random(8) );
speed:=StrToint(Edit3.Text);
color:=colors[Random(5)];
BorderColor:=clBlack;
x:=random(471)+10;
y:=random(471)+10;
x1:=x+40;
y1:=y+40;
end;
Timer1.Enabled:=true;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
i: integer;
begin
for i:=1 to MaxBalls do
begin
ball := balls[i];
case Ball.Direction of
dLeft: with ball do x:=x-Speed;

dUpleft: with ball do begin
x:=x-Speed;
y:=y-Speed;
end;

dupright: with ball do begin
x:=x+Speed;
y:=y-Speed;
end;

dright: with ball do x:=x+Speed;

ddownright: with ball do begin
x:=x+Speed;
y:=y+Speed;
end;

ddownleft: with ball do begin
x:=x-Speed;
y:=y+Speed;
end;

ddown: with ball do y:=y+Speed;
dup: with ball do y:=y-Speed;
end;

if ball.x<=10 then
begin
if( Ball.Direction = dLeft ) Then Ball.Direction:= dright;
if( Ball.Direction = dUpleft ) Then Ball.Direction:= dupright;
if( Ball.Direction = ddownleft ) Then Ball.Direction:= ddownright;
end;

if ball.y<=10 then
begin
if( Ball.Direction = dUpleft ) Then Ball.Direction:= ddownleft;
if( Ball.Direction = dup ) Then Ball.Direction:= ddown;
if( Ball.Direction = dupright ) Then Ball.Direction:= ddownright;
end;

if ball.x >= (PaintBox1.Width-13) then
begin
if( Ball.Direction = dright ) Then Ball.Direction:= dLeft;
if( Ball.Direction = ddownright ) Then Ball.Direction:= ddownleft;
if( Ball.Direction = dupright ) Then Ball.Direction:=dUpleft;
end;

if ball.y >= (PaintBox1.Height-12) then
begin
if( Ball.Direction = ddown ) Then Ball.Direction:= dup;
if( Ball.Direction = ddownleft ) Then Ball.Direction:= dUpleft;
if( Ball.Direction = ddownright ) Then Ball.Direction:= dupright;
end;
balls[i]:=ball;
end;

//столкновение шаров

for j :=1 to Maxballs do begin
if i=j then continue;
if sqrt(sqr(ball.x-balls[j].x)+sqr(ball.y-balls[j].y))<=2*balls[j].size+ball.speed
then
begin
if Ball.Direction = dLeft then Ball.Direction:= dright;
if Ball.Direction = dright then Ball.Direction:= dLeft;
if Ball.Direction = dUpleft then Ball.Direction:= ddownright;
if Ball.Direction = ddownright then Ball.Direction:= dUpleft;
if Ball.Direction = dupright then Ball.Direction:= ddownleft;
if Ball.Direction= ddownleft then Ball.Direction:= dupright;
if Ball.Direction = ddown then Ball.Direction:= dup;
if Ball.Direction = dup then Ball.Direction:= ddown;

if Balls[j].Direction = dLeft then Balls[j].Direction:= dright;
if Balls[j].Direction = dright then Balls[j].Direction:= dLeft;
if Balls[j].Direction = dUpleft then Balls[j].Direction:= ddownright;
if Balls[j].Direction = ddownright then Balls[j].Direction:= dUpleft;
if Balls[j].Direction = dupright then Balls[j].Direction:= ddownleft;
if Balls[j].Direction = ddownleft then Balls[j].Direction:= dupright;
if Balls[j].Direction = ddown then Balls[j].Direction:= dup;
if Balls[j].Direction = dup then Balls[j].Direction:= ddown;

DrawBalls;
end;
end;
end;




procedure TForm1.FormCreate(Sender: TObject);
begin

MyBMP:=TBitmap.Create;
MyBMP.Width:=500;
MyBMP.Height:=500;
MyBMP.Canvas.Pen.Color:=clRed;
MyBMP.Canvas.Brush.Color:=clRed;
map_width:=500;
map_height:=500;
PaintBox1.Width:=map_width;
PaintBox1.Height:=map_height;
end;

end.