158 lines
4.8 KiB
ObjectPascal
158 lines
4.8 KiB
ObjectPascal
unit Octahedron;
|
||
|
||
{$mode objfpc}{$H+}
|
||
|
||
interface
|
||
|
||
uses
|
||
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls, StdCtrls,
|
||
Spin, Geometry;
|
||
|
||
type
|
||
|
||
{ TForm1 }
|
||
|
||
TForm1 = class(TForm)
|
||
BackScreen: TImage;
|
||
StartStopBtn: TButton;
|
||
Screen: TPaintBox;
|
||
procedure StartStopBtnClick(Sender: TObject);
|
||
private
|
||
|
||
public
|
||
|
||
end;
|
||
|
||
var
|
||
Form1: TForm1;
|
||
IsRunning: Boolean = false;
|
||
|
||
implementation
|
||
|
||
{$R *.lfm}
|
||
|
||
procedure ShowShape(Shape: Object3D); { нарисовать объект }
|
||
var
|
||
i, Xs, Ys: Integer;
|
||
x, y, z: Real;
|
||
const
|
||
N = 300; { "глубина" экрана }
|
||
begin
|
||
for i := 0 to High(Shape.edges) do { цикл по всем ребрам }
|
||
begin { координаты первой точки ребра }
|
||
x := Shape.vertices[Shape.edges[i].src].x + Shape.xc;
|
||
y := Shape.vertices[Shape.edges[i].src].y + Shape.yc;
|
||
z := Shape.vertices[Shape.edges[i].src].z + Shape.zc;
|
||
if Abs(z) < 0.01 then z := 0.01; { избегаем деления на нуль }
|
||
{ вычисляем экранные координаты }
|
||
Xs := Round(Form1.Screen.Width div 2 + N * x / z);
|
||
Ys := Round(Form1.Screen.Height div 2 + N * y / z);
|
||
|
||
Form1.BackScreen.Canvas.MoveTo(Xs, Ys);
|
||
{ координаты второй точки зрения }
|
||
x := Shape.vertices[Shape.edges[i].dest].x + Shape.xc;
|
||
y := Shape.vertices[Shape.edges[i].dest].y + Shape.yc;
|
||
z := Shape.vertices[Shape.edges[i].dest].z + Shape.zc;
|
||
if Abs(z) < 0.01 then z := 0.01; { избегаем деления на нуль }
|
||
{ и ее экранные координаты }
|
||
Xs := Round(Form1.Screen.Width div 2 + N * x / z);
|
||
Ys := Round(Form1.Screen.Height div 2 + N * y / z);
|
||
|
||
Form1.BackScreen.Canvas.LineTo(Xs, Ys); { рисуем ребро }
|
||
end;
|
||
end;
|
||
|
||
{ TForm1 }
|
||
|
||
procedure TForm1.StartStopBtnClick(Sender: TObject); { главная процедура }
|
||
var
|
||
oldtime: TDateTime;
|
||
Model: Object3D; { трехмерный объект }
|
||
Vx, Vy, Vz: Real; { значения составляющих его скорости }
|
||
xa, ya, za: Real;
|
||
pause: Integer;
|
||
const
|
||
MSecsPerFrame = 25; { скорость работы (кадров в секунду) }
|
||
begin
|
||
xa := Random(10) / 100; { скорость вращения вокруг оси Ox }
|
||
ya := Random(10) / 100; { скорость вращения вокруг оси Oy }
|
||
za := Random(10) / 100; { скорость вращения вокруг оси Oz }
|
||
|
||
if IsRunning then
|
||
begin
|
||
IsRunning := false;
|
||
StartStopBtn.Caption := 'Пуск';
|
||
Exit;
|
||
end;
|
||
StartStopBtn.Caption := 'Стоп';
|
||
IsRunning := true;
|
||
|
||
Model := LoadObject3D('octahedron.txt'); { загрузить объект }
|
||
|
||
Model.xc := (Screen.Width div 2) - Random(Screen.Width); { начальное положение }
|
||
Model.yc := (Screen.Height div 2) - Random(Screen.Height); { объекта }
|
||
Model.zc := 200;
|
||
Vx := 10 - Random(20); { и составляющие }
|
||
Vy := 15 - Random(30); { скорости }
|
||
Vz := 20 - Random(40);
|
||
|
||
while IsRunning do
|
||
begin
|
||
oldtime := Now;
|
||
|
||
{ отразить от стена (3D-аналог "молекулы в закрытом сосуде") }
|
||
if Model.xc > BackScreen.Width div 2 then
|
||
begin
|
||
Model.xc := BackScreen.Width div 2;
|
||
Vx := -Vx;
|
||
end;
|
||
if Model.xc < -BackScreen.Width div 2 then
|
||
begin
|
||
Model.xc := -BackScreen.Width div 2;
|
||
Vx := -Vx;
|
||
end;
|
||
|
||
if Model.yc > BackScreen.Height div 2 then
|
||
begin
|
||
Model.yc := BackScreen.Height div 2;
|
||
Vy := -Vy;
|
||
end;
|
||
if Model.yc < -BackScreen.Height div 2 then
|
||
begin
|
||
Model.yc := -BackScreen.Height div 2;
|
||
Vy := -Vy;
|
||
end;
|
||
|
||
if Model.zc > 1000 then
|
||
begin
|
||
Model.zc := 1000;
|
||
Vz := -Vz;
|
||
end;
|
||
if Model.zc < 200 then
|
||
begin
|
||
Model.zc := 200;
|
||
Vz := -Vz;
|
||
end;
|
||
|
||
RotateShape(Model, xa, ya, za); { поворот модели }
|
||
BackScreen.Canvas.FillRect(Rect(0, 0, Screen.Width, Screen.Height));
|
||
ShowShape(Model); { очистить экран и нарисовать объект }
|
||
{ отобразить объект на основном экране }
|
||
Screen.Canvas.CopyRect(Rect(0, 0, Screen.Width, Screen.Height),
|
||
BackScreen.Canvas, Rect(0, 0, Screen.Width, Screen.Height));
|
||
|
||
Model.xc := Model.xc + Vx;
|
||
Model.yc := Model.yc + Vy;
|
||
Model.zc := Model.zc + Vz;
|
||
|
||
Application.ProcessMessages;
|
||
pause := Round(MSecsPerFrame - (Now - oldtime) * MSecsPerDay);
|
||
if pause > 0 then Sleep(pause); { задержка }
|
||
|
||
if Application.Terminated then Exit;
|
||
end;
|
||
end;
|
||
|
||
end.
|
||
|