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code.delx.au - pong/blob - pong.c
2 #pragma comment(linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"")
4 #elif defined(__APPLE__) || defined(MACOSX)
14 // Amount to increase speed by on x, y axis, and when bouncing
17 #define SPEEDBINC 0.15
18 #define PADDLESPEED 3.0
24 static int p1move
= 0;
25 static int p2move
= 0;
26 static int score1
= 0;
27 static int score2
= 0;
28 static GLdouble paddle1
= 0.0;
29 static GLdouble paddle2
= 0.0;
30 static GLdouble ballX
= 0.0;
31 static GLdouble ballY
= 0.0;
32 static GLdouble ballVecX
= 0.0;
33 static GLdouble ballVecY
= 0.0;
36 static void initball(void) {
46 static void run(void) {
49 if(ballY
< paddle2
- PADDLESIZE
)
51 else if(ballY
> paddle2
+ PADDLESIZE
)
58 paddle1
+= p1move
* PADDLESPEED
;
59 paddle2
+= p2move
* PADDLESPEED
;
69 // Check for collisions with paddles
70 if(ballVecX
< 0 && ballX
<= -HEIGHT
+ -ballVecX
* 1.5) {
71 if(ballY
>= paddle1
- PADDLESIZE
&& ballY
<= paddle1
+ PADDLESIZE
) {
72 GLdouble speedChange
= fmax(1.0, fabs(paddle1
- ballY
) * SPEEDBINC
);
73 ballVecX
*= -speedChange
* SPEEDXINC
;
74 ballVecY
*= speedChange
* SPEEDYINC
;
77 if(ballVecX
> 0 && ballX
>= HEIGHT
- ballVecX
* 1.5) {
78 if(ballY
>= paddle2
- PADDLESIZE
&& ballY
<= paddle2
+ PADDLESIZE
) {
79 GLdouble speedChange
= fmax(1.0, fabs(paddle2
- ballY
) * SPEEDBINC
);
80 ballVecX
*= -speedChange
* SPEEDXINC
;
81 ballVecY
*= speedChange
* SPEEDYINC
;
85 // Check if it's past the top or bottom of the screen
86 if(ballY
>= HEIGHT
|| ballY
<= -HEIGHT
) {
90 // Check if it's past the sides of the screen
95 if(ballX
<= -HEIGHT
) {
104 // Check scores for winners..
115 static void display(void) {
116 glClear(GL_COLOR_BUFFER_BIT
);
117 glColor3d(0.0, 0.0, 0.0);
122 glVertex2d(-HEIGHT
+ 1, paddle1
- PADDLESIZE
);
123 glVertex2d(-HEIGHT
+ 1, paddle1
+ PADDLESIZE
);
124 glVertex2d( HEIGHT
- 1, paddle2
+ PADDLESIZE
);
125 glVertex2d( HEIGHT
- 1, paddle2
- PADDLESIZE
);
131 glVertex2d(ballX
, ballY
);
135 glRasterPos2d(-5.0, HEIGHT
- 10.0);
136 glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18
, '0' + score1
);
137 glRasterPos2d( 5.0, HEIGHT
- 10.0);
138 glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18
, '0' + score2
);
143 static void resize(int w
, int h
) {
144 glViewport(0, 0, w
, h
);
146 glOrtho(-HEIGHT
, HEIGHT
, -HEIGHT
, HEIGHT
, -1.0, 1.0);
149 static void keyboard(unsigned char key
, int x
, int y
) {
178 static void keyboardUp(unsigned char key
, int x
, int y
) {
195 static void timer(int lastTime
) {
196 int curTime
= glutGet(GLUT_ELAPSED_TIME
);
200 } while(lastTime
+ FRAME
< curTime
);
202 glutTimerFunc(FRAME
- (curTime
- lastTime
), timer
, curTime
);
205 static void init(void) {
206 glClearColor(1.0, 1.0, 1.0, 0.0);
210 int main(int argc
, char *argv
[]) {
211 if(argc
== 2 && *argv
[1] == '1') {
215 glutInitWindowPosition(100, 100);
216 glutInitWindowSize(640, 480);
217 glutInit(&argc
, argv
);
218 glutInitDisplayMode(GLUT_RGBA
| GLUT_DOUBLE
);
219 glutCreateWindow(argv
[0]);
220 glutDisplayFunc(display
);
221 glutReshapeFunc(resize
);
222 glutKeyboardFunc(keyboard
);
223 glutKeyboardUpFunc(keyboardUp
);
224 glutTimerFunc(FRAME
, timer
, glutGet(GLUT_ELAPSED_TIME
));