1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
| unit main;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls,
OpenGLContext, gl, glu, LCLType, ComCtrls, Types, Math;
type
{ TOGLForm }
TOGLForm = class(TForm)
GLBox: TOpenGLControl;
procedure FormCreate(Sender: TObject);
procedure GLBoxMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
procedure GLBoxMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
procedure GLBoxMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
procedure GLBoxMouseWheel(Sender: TObject; Shift: TShiftState; WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
procedure GLBoxPaint(Sender: TObject);
private
procedure CreateBase;
procedure CreateNet;
procedure Draw;
public
down,XS,YS,dx,dy,dz:integer;
end;
var
OGLForm: TOGLForm;
implementation
{$R *.lfm}
{ TOGLForm }
var xf,yf,zf,x0,y0,z0:double;
procedure TOGLForm.FormCreate(Sender: TObject);
begin
zf:=200;xf:=-200;yf:=0; //--Камера
x0:=0;y0:=0;z0:=0; //--Цель
end;
//--Нахождение угла (+-180° по x,y)
function Angle(x,y:double):double;
begin
if (Abs(x)<0.00000001) and (y>0) then begin Result:=90;exit;end;
if (Abs(x)<0.00000001) and (y<0) then begin Result:=-90;exit;end;
if (Abs(y)<0.00000001) and (x>0) then begin Result:=0;exit;end;
if (Abs(y)<0.00000001) and (x<0) then begin Result:=180;exit;end;
if (x>0) and (y>0) then begin Result:=arctan(y/x)*180/PI;exit;end;
if (x>0) and (y<0) then begin Result:=arctan(y/x)*180/PI;exit;end;
if (x<0) and (y>0) then begin Result:=180+arctan(y/x)*180/PI;exit;end;
if (x<0) and (y<0) then begin Result:=-180+arctan(y/x)*180/PI;exit;end;
end;
//--Нажатие кнопки мыши
procedure TOGLForm.GLBoxMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
XS:=X;YS:=Y;
if Button = mbLeft then down:=1;
if Button = mbRight then down:=2;
if (Button = mbRight) and (ssCtrl in Shift) then down:=3;
end;
//--Колесо мыши - приближение/удаление
procedure TOGLForm.GLBoxMouseWheel(Sender: TObject; Shift: TShiftState; WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
var r,r2,rp,rp2,xa,ya,za:double;
begin
r:=Sqrt((xf-x0)*(xf-x0)+(yf-y0)*(yf-y0)+zf*zf);
if WheelDelta<0 then rp:=r+5 else rp:=r-5;
r2:=r*r;
rp2:=rp*rp;
xa:=Sqrt((xf-x0)*(xf-x0)*rp2/r2);
ya:=Sqrt((yf-y0)*(yf-y0)*rp2/r2);
za:=Sqrt(zf*zf*rp2/r2);
xf:=xa*sign(xf-x0)+x0;
yf:=ya*sign(yf-y0)+y0;
zf:=za*sign(zf);
Draw;
end;
//--Движение мыши
procedure TOGLForm.GLBoxMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
var teta,dt,dtx,dty,x1,y1,r,fi,fiz:Extended;
//label 1;
begin
//---Поворот вокруг прямой Ax+By+C=0 (подъём, фи,тэта)
if down=1 then
begin
dt:=YS-Y;
fiz:=Angle(xf-x0,yf-y0);
r:=Sqrt((xf-x0)*(xf-x0)+(yf-y0)*(yf-y0)+zf*zf);
teta:=arccos(zf/r)*180/PI;
teta:=teta+dt/2;
if (teta<0) or (teta>90) then exit;
xf:=r*cos(fiz*PI/180)*sin(teta*PI/180)+x0;
yf:=r*sin(fiz*PI/180)*sin(teta*PI/180)+y0;
zf:=r*cos(teta*PI/180);
YS:=Y;
Draw;exit;
end;
//---Поворот вокруг оси Z (фи)
if down=2 then
begin
dt:=XS-X;dt:=dt/5;
fiz:=dt*PI/180;
x1:=(xf-x0)*cos(fiz)-(yf-y0)*sin(fiz);
y1:=(xf-x0)*sin(fiz)+(yf-y0)*cos(fiz);
xf:=x1+x0;
yf:=y1+y0;
Draw;
XS:=X;
exit;
end;
//---Смещение
if down=3 then
begin
dt:=XS-X;dt:=dt/5;
fi:=Angle(xf-x0,yf-y0);
dtx:=-cos((fi-90)*PI/180)*dt;dty:=-sin((fi-90)*PI/180)*dt;
xf:=xf+dtx;
yf:=yf+dty;
x0:=x0+dtx;
y0:=y0+dty;
Draw;
XS:=X;
exit;
end;
end;
//--Отжатие мыши
procedure TOGLForm.GLBoxMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
down:=0;
end;
//--Рисовать
procedure TOGLForm.GLBoxPaint(Sender: TObject);
begin
Draw;
end;
//--Задать параметры рисования, нарисовать "пол"
procedure TOGLForm.CreateBase;
begin
glClearColor(0.8,0.9,1.0,1);
glCullFace(GL_FRONT_AND_BACK);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glShadeModel(GL_SMOOTH);
glHint(GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
glEnable(GL_POLYGON_SMOOTH);
glHint(GL_POINT_SMOOTH_HINT, GL_FASTEST);
glEnable(GL_POINT_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_FASTEST);
glEnable(GL_LINE_SMOOTH);
glDisable( GL_DEPTH_TEST );
glEnable( GL_ALPHA_TEST );
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(gl_Projection);
glLoadIdentity;
gluPerspective(45,Width/Height, 0.1, 1000);
glViewport(0,0,Width,Height);
gluLookAt(xf,yf,zf,x0,y0,z0,0,0,1);
glBegin(gl_Quads);
glColor3f(0.3,0.5,0);
glVertex3f(200,200,0);
glVertex3f(200,-200,0);
glVertex3f(-200,-200,0);
glVertex3f(-200,200,0);
glEnd;
end;
//--Рисовать сетку
procedure TOGLForm.CreateNet;
var i,j:integer;
begin
glColor3f(1,1,0);
glLineWidth(1.0);
glBegin(gl_Lines);
for i:=0 to 10 do
begin
glVertex3f(-50,i*10-50,0);glVertex3f(50,i*10-50,0);
glVertex3f(i*10-50,-50,0);glVertex3f(i*10-50,50,0);
end;
glEnd;
end;
//--Рисовать
procedure TOGLForm.Draw;
begin
CreateBase;
CreateNet;
GLBox.SwapBuffers;
end;
end. |
