Admin: 1 revision

2011-10-14T20:49:22Z

1 revision

← Older revision

Revision as of 20:49, 14 October 2011

Lola: Protected "Pong" [edit=autoconfirmed:move=autoconfirmed]

2011-04-10T15:48:00Z

Protected "Pong" [edit=autoconfirmed:move=autoconfirmed]

New page

//
// Pong for the LEGO Mindstorms NXT.
//
// Copyright (c) 2007, Michael Andersen (mian_/#>_pobox.com)
//

#define HEIGHT (64)
#define WIDTH (100)
#define PADDLE_HEIGHT (HEIGHT/4)
#define PADDLE_WIDTH (1)
#define PADDLE_MIN (0)
#define PADDLE_MAX (HEIGHT-PADDLE_HEIGHT)

#define TACHO_PADDLE_RATIO (1)

#define LOOP_PAUSE (500)

#define A_X (0)
#define B_X (98)

#define BALL_DX (4)
#define BALL_DY (0)

#define BALL_DIAMETER (2)

task main ()
{
int i, j;

int score_a, score_b;

int motor_a_now, motor_a_before, motor_a_init, a;
int motor_b_now, motor_b_before, motor_b_init, b;

int ball_x, ball_y, ball_dx, ball_dy, ball_angle;

// initial motor positions
motor_a_init = MotorTachoCount (OUT_A);
motor_a_now = motor_a_init;
motor_a_before = motor_a_init;
motor_b_init = MotorTachoCount (OUT_B);
motor_b_now = motor_b_init;
motor_b_before = motor_b_init;

// center paddle positions
a = HEIGHT/2-PADDLE_HEIGHT/2;
b = HEIGHT/2-PADDLE_HEIGHT/2;

// ball position
ball_x = WIDTH/2;
ball_y = HEIGHT/2;
// ball speed
ball_dx = BALL_DX;
ball_dy = BALL_DY;

// scores
score_a = 0;
score_b = 0;

while (true)
{
motor_a_now = MotorTachoCount (OUT_A) - motor_a_init;
if (motor_a_now <> motor_a_before)
{
a = a + (motor_a_now - motor_a_before)/TACHO_PADDLE_RATIO;
if (a < PADDLE_MIN) a = PADDLE_MIN;
if (a > PADDLE_MAX) a = PADDLE_MAX;
}
motor_a_before = motor_a_now;

motor_b_now = MotorTachoCount (OUT_B) - motor_b_init;
if (motor_b_now <> motor_b_before)
{
b = b + (motor_b_now - motor_b_before)/TACHO_PADDLE_RATIO;
if (b < PADDLE_MIN) b = PADDLE_MIN;
if (b > PADDLE_MAX) b = PADDLE_MAX;
}
motor_b_before = motor_b_now;

// new position
ball_x += ball_dx;
ball_y += ball_dy;

// adjust for A paddle bounce (left)
if (ball_x < 1)
{
if ((a <= ball_y) && (ball_y <= (a + PADDLE_HEIGHT)))
{
// hit - calculate angle of return
ball_dy = (ball_y - a - PADDLE_HEIGHT/2)/2; // range -4 to 4
ball_dx = 4;
ball_x += ball_dx;
}
else
{
// missed
score_b++;

// ball position
ball_x = WIDTH/2;
ball_y = HEIGHT/2;
// ball speed
ball_dx = -BALL_DX;
ball_dy = BALL_DY;
}
}

// adjust for B paddle bounce (right)
if (ball_x > 98)
{
if ((b <= ball_y) && (ball_y <= (b + PADDLE_HEIGHT)))
{
// hit - calculate angle of return
ball_dy = (ball_y - b - PADDLE_HEIGHT/2)/2; // range -4 to 4
ball_dx = -4;
ball_x += ball_dx;
}
else
{
// missed
score_a++;

// ball position
ball_x = WIDTH/2;
ball_y = HEIGHT/2;
// ball speed
ball_dx = BALL_DX;
ball_dy = BALL_DY;
}
}

// adjust for side bounce
if ((ball_y <= 0) || (ball_y > 64))
{
ball_y -= ball_dy;
ball_dy = -ball_dy;
}

ClearScreen ();
// paddles
RectOut (A_X, a, PADDLE_WIDTH, PADDLE_HEIGHT);
RectOut (B_X, b, PADDLE_WIDTH, PADDLE_HEIGHT);
// net
RectOut (49,3,1,8);
RectOut (49,19,1,8);
RectOut (49,35,1,8);
RectOut (49,51,1,8);
// ball
//NumOut (10, LCD_LINE2, ball_x);
//NumOut (10, LCD_LINE3, ball_y);
//CircleOut (ball_x, ball_y, BALL_DIAMETER);
RectOut (ball_x-1, ball_y-1, 1, 1);
RectOut (ball_x-2, ball_y-2, 3, 3);
// score
NumOut (35, LCD_LINE8, score_a);
NumOut (60, LCD_LINE8, score_b);

for (i = 0; i < LOOP_PAUSE; i++);
}
}

[[Category:Snippets]]

Pong - Revision history

Admin: 1 revision

Lola: Protected "Pong" [edit=autoconfirmed:move=autoconfirmed]