Yi Hao Chen / Mbed 2 deprecated 4180_lab4_tank_war_game

Game for 4180 Lab4

Dependencies:   4DGL-uLCD-SE 4180_lab4_tank_war_game Game_Synchronizer MMA8452 SDFileSystem mbed-rtos mbed wave_player

Dependents:   4180_lab4_tank_war_game

Bullet/bullet.cpp@0:ffed9a3bc797, 2017-03-13 (annotated)

Committer:
ychen644
Date:
Mon Mar 13 21:23:17 2017 +0000
Revision:
0:ffed9a3bc797
Uploading 4180 Lab4 game to Notebook wiki

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ychen644 0:ffed9a3bc797 1 #include "uLCD_4DGL.h"
ychen644 0:ffed9a3bc797 2 #include "bullet.h"
ychen644 0:ffed9a3bc797 3 #include "game_synchronizer.h"
ychen644 0:ffed9a3bc797 4 #include "globals.h"
ychen644 0:ffed9a3bc797 5 #include "math.h"
ychen644 0:ffed9a3bc797 6 #include "playSound.h"
ychen644 0:ffed9a3bc797 7
ychen644 0:ffed9a3bc797 8 extern Serial pc;
ychen644 0:ffed9a3bc797 9
ychen644 0:ffed9a3bc797 10 extern Game_Synchronizer sync;
ychen644 0:ffed9a3bc797 11
ychen644 0:ffed9a3bc797 12 // Initialize the bullet. Don't have to do much here.
ychen644 0:ffed9a3bc797 13 // Keep a pointer to this bullet's tank.
ychen644 0:ffed9a3bc797 14 // Set the speed, and default the bullet to not in_flight.
ychen644 0:ffed9a3bc797 15 Bullet::Bullet(Tank* t) {
ychen644 0:ffed9a3bc797 16 tank = t;
ychen644 0:ffed9a3bc797 17 speed = 30;
ychen644 0:ffed9a3bc797 18 powerups = 2;
ychen644 0:ffed9a3bc797 19 power = 0;
ychen644 0:ffed9a3bc797 20 in_flight = false;
ychen644 0:ffed9a3bc797 21 }
ychen644 0:ffed9a3bc797 22
ychen644 0:ffed9a3bc797 23 // If in_flight, do nothing. Otherwise,
ychen644 0:ffed9a3bc797 24 // set the in_flight flag, and initialize values needed for
ychen644 0:ffed9a3bc797 25 // the trajectory calculations. (x0, y0), (vx0, vy0), time
ychen644 0:ffed9a3bc797 26 // Hint: tank->barrel_end(...) is useful here.
ychen644 0:ffed9a3bc797 27 void Bullet::shoot(void) {
ychen644 0:ffed9a3bc797 28 if (!in_flight) {
ychen644 0:ffed9a3bc797 29 in_flight = true;
ychen644 0:ffed9a3bc797 30 tank->barrel_end(&x0, &y0);
ychen644 0:ffed9a3bc797 31 x = x0;
ychen644 0:ffed9a3bc797 32 y = y0;
ychen644 0:ffed9a3bc797 33 vx0 = speed*cos(tank->barrel_theta);
ychen644 0:ffed9a3bc797 34 vy0 = speed*sin(tank->barrel_theta);
ychen644 0:ffed9a3bc797 35 vx = vx0;
ychen644 0:ffed9a3bc797 36 vy = vy0;
ychen644 0:ffed9a3bc797 37 bounce = 0;
ychen644 0:ffed9a3bc797 38 time = 0;
ychen644 0:ffed9a3bc797 39 }
ychen644 0:ffed9a3bc797 40 }
ychen644 0:ffed9a3bc797 41
ychen644 0:ffed9a3bc797 42 void Bullet::changeSky(int SKY_COLOR2) {
ychen644 0:ffed9a3bc797 43 SKY_COLOR = SKY_COLOR2;
ychen644 0:ffed9a3bc797 44 }
ychen644 0:ffed9a3bc797 45
ychen644 0:ffed9a3bc797 46 // power up increases explosion size
ychen644 0:ffed9a3bc797 47 // you get 2 powerups per round
ychen644 0:ffed9a3bc797 48 void Bullet::powerUp(void) {
ychen644 0:ffed9a3bc797 49 if (powerups > 0) {
ychen644 0:ffed9a3bc797 50 // play sound for powerup
ychen644 0:ffed9a3bc797 51 playSound("/sd/wavfiles/boing2.wav");
ychen644 0:ffed9a3bc797 52 powerups = powerups - 1;
ychen644 0:ffed9a3bc797 53 power = power + 1;
ychen644 0:ffed9a3bc797 54 }
ychen644 0:ffed9a3bc797 55 }
ychen644 0:ffed9a3bc797 56
ychen644 0:ffed9a3bc797 57 // If the bullet is in flight, calculate its new position
ychen644 0:ffed9a3bc797 58 // after a time delta dt.
ychen644 0:ffed9a3bc797 59 void Bullet::update_position(float dt) {
ychen644 0:ffed9a3bc797 60 vx = vx;
ychen644 0:ffed9a3bc797 61 vy = vy - 9.81*dt;
ychen644 0:ffed9a3bc797 62 x = floor(x0 + vx*time);
ychen644 0:ffed9a3bc797 63 y = floor(y0 + vy*time - 0.5*9.81*time*time);
ychen644 0:ffed9a3bc797 64 }
ychen644 0:ffed9a3bc797 65
ychen644 0:ffed9a3bc797 66 void boing(void const *argument) {
ychen644 0:ffed9a3bc797 67 playSound("/sd/wavfiles/boing2.wav");
ychen644 0:ffed9a3bc797 68 }
ychen644 0:ffed9a3bc797 69
ychen644 0:ffed9a3bc797 70 int Bullet::time_step(float dt) {
ychen644 0:ffed9a3bc797 71 // If the bullet hasn't hit anything,
ychen644 0:ffed9a3bc797 72 // redraw the bullet at its new location.
ychen644 0:ffed9a3bc797 73 // If it has hit something (obstacle, tank, edge of the screen),
ychen644 0:ffed9a3bc797 74 // set the in_flight flag back to false, explode the nearby area,
ychen644 0:ffed9a3bc797 75 // and return one of the following codes.
ychen644 0:ffed9a3bc797 76 //
ychen644 0:ffed9a3bc797 77 // return codes:
ychen644 0:ffed9a3bc797 78 // BULLET_NO_COLLISION: no collision
ychen644 0:ffed9a3bc797 79 // BULLET_OFF_SCREEN: off the side of the screen
ychen644 0:ffed9a3bc797 80 // Otherwise, return the color you've hit in 16bpp format.
ychen644 0:ffed9a3bc797 81 if (in_flight) {
ychen644 0:ffed9a3bc797 82 int x_old = x;
ychen644 0:ffed9a3bc797 83 int y_old = y;
ychen644 0:ffed9a3bc797 84 // old pixel
ychen644 0:ffed9a3bc797 85 sync.pixel(x_old, y_old, SKY_COLOR);
ychen644 0:ffed9a3bc797 86 sync.update();
ychen644 0:ffed9a3bc797 87 time = time + dt;
ychen644 0:ffed9a3bc797 88 update_position(dt);
ychen644 0:ffed9a3bc797 89 // new pixel
ychen644 0:ffed9a3bc797 90 int color = sync.read_pixel(x, y);
ychen644 0:ffed9a3bc797 91 if (x_old == x && y_old == y) {
ychen644 0:ffed9a3bc797 92 // no change
ychen644 0:ffed9a3bc797 93 sync.pixel(x, y, tank->tank_color);
ychen644 0:ffed9a3bc797 94 return BULLET_NO_COLLISION;
ychen644 0:ffed9a3bc797 95 } else if (x < 0 || x > 128 || y < 0 || y > 128) {
ychen644 0:ffed9a3bc797 96 // out of bounds
ychen644 0:ffed9a3bc797 97 in_flight = false;
ychen644 0:ffed9a3bc797 98 return BULLET_OFF_SCREEN;
ychen644 0:ffed9a3bc797 99 } else if (sync.pixel_eq(color, SKY_COLOR)) {
ychen644 0:ffed9a3bc797 100 // travelling in the sky
ychen644 0:ffed9a3bc797 101 sync.pixel(x, y, tank->tank_color);
ychen644 0:ffed9a3bc797 102 return BULLET_NO_COLLISION;
ychen644 0:ffed9a3bc797 103 } else if (!sync.pixel_eq(color, SKY_COLOR)) {
ychen644 0:ffed9a3bc797 104 // hit
ychen644 0:ffed9a3bc797 105 if (sync.pixel_eq(color, GND_COLOR)) {
ychen644 0:ffed9a3bc797 106 bounce = bounce + 1;
ychen644 0:ffed9a3bc797 107 // bounce
ychen644 0:ffed9a3bc797 108 if (bounce < 3) {
ychen644 0:ffed9a3bc797 109 vy = vy/2.0;
ychen644 0:ffed9a3bc797 110 sync.pixel(x, y, tank->tank_color);
ychen644 0:ffed9a3bc797 111 return BULLET_NO_COLLISION;
ychen644 0:ffed9a3bc797 112 }
ychen644 0:ffed9a3bc797 113 }
ychen644 0:ffed9a3bc797 114 // hit
ychen644 0:ffed9a3bc797 115 in_flight = false;
ychen644 0:ffed9a3bc797 116 int i = 1;
ychen644 0:ffed9a3bc797 117 // powerup increases explosion size
ychen644 0:ffed9a3bc797 118 for(i = 1; i < 5 + (power * 3); i++) {
ychen644 0:ffed9a3bc797 119 sync.filled_rectangle(x-i, y-i, x+i, y+i, tank->tank_color);
ychen644 0:ffed9a3bc797 120 sync.update();
ychen644 0:ffed9a3bc797 121 wait(0.1);
ychen644 0:ffed9a3bc797 122 }
ychen644 0:ffed9a3bc797 123 power = 0;
ychen644 0:ffed9a3bc797 124 // make everything the sky afterwards
ychen644 0:ffed9a3bc797 125 sync.filled_rectangle(x-i-1, y-i-1, x+i-1, y+i-1, SKY_COLOR);
ychen644 0:ffed9a3bc797 126 sync.update();
ychen644 0:ffed9a3bc797 127 // play the sound
ychen644 0:ffed9a3bc797 128 playSound("/sd/wavfiles/splooge.wav");
ychen644 0:ffed9a3bc797 129 return color;
ychen644 0:ffed9a3bc797 130 }
ychen644 0:ffed9a3bc797 131 }
ychen644 0:ffed9a3bc797 132 return BULLET_NO_COLLISION;
ychen644 0:ffed9a3bc797 133 }