Yingjian Guo
The library for the game engine
Diff: GameEngine.cpp
- Revision:
- 8:661097776006
- Child:
- 9:bd53c6e90213
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/GameEngine.cpp Thu May 04 03:00:54 2017 +0000
@@ -0,0 +1,179 @@
+#include "GameEngine.h"
+//funtion to construct
+GameEngine::GameEngine()
+{
+
+}
+
+//function to destruct
+GameEngine::~GameEngine()
+{
+
+}
+
+//function to initialise the game parameters
+void GameEngine::init()
+{
+ monster_number = 50; // monster number is set to 50
+ life = 3; // 3 chances to miss the monster
+ _A = 0; // A button check
+
+ _Jet.init(); // initialise the jet
+ _Monster.init(); // initialise the monster
+}
+
+//function to read inputs
+void GameEngine::read_input(Gamepad &pad)
+{
+ _d = pad.get_direction(); // get the move direction of the joystick
+ _mag = pad.get_mag(); // get the move magnitude of the joystick
+ check_fire(pad); // check if the fire button is pressed
+}
+
+//function to draw all elements
+void GameEngine::draw(N5110 &lcd)
+{
+ // the bitmap of the cloud
+ static int cloud[] =
+ {
+ 0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,
+ 0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,
+ 0,0,1,1,0,0,0,0,1,0,0,0,0,0,0,
+ 0,1,0,0,0,0,0,0,0,1,0,1,1,0,0,
+ 1,0,0,0,0,0,0,0,0,0,1,0,0,1,0,
+ 1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
+ 0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,
+ 0,0,1,0,0,0,0,0,1,0,0,0,0,1,0,
+ 0,0,0,1,1,0,0,1,0,1,0,0,1,0,0,
+ 0,0,0,0,0,1,1,0,0,0,1,1,0,0,0,
+ };
+ lcd.clear();
+ Bitmap sprite(cloud, 10, 15); // rows & columns of the cloud
+ sprite.render(lcd, 60, 5); // draw clouds
+ sprite.render(lcd, 10, 32);
+ _Jet.draw(lcd); // draw jet
+ _Monster.draw(lcd); // draw monster
+ if(_A == 1) // if fire button is pressed
+ {
+ _Ammo.draw(lcd); // draw bullet
+ }
+ sprite.render(lcd, 35, 19);
+
+ sprintf(life_buffer,"x%d",life);
+ lcd.printString(life_buffer,1,0); // draw life value
+ sprintf(number_buffer,"%d",monster_number);
+ lcd.printString(number_buffer,25,0); // draw monster number
+ lcd.refresh();
+}
+
+//function to update game parameters
+void GameEngine::update(Gamepad &pad)
+{
+ _Jet.update(_d,_mag); // update jet position
+ _Ammo.update(); // update ammo position
+ _Monster.update(); // update monster position
+ check_hit_monster(pad); // check if the monster is killed
+ check_Jet_collision(pad); // check if the jet crashed
+ check_hit_wall(pad); // check if the monster hits the wall
+}
+
+//function to check the fire button
+void GameEngine::check_fire(Gamepad &pad)
+{
+ // intialise the bullet if the fire button if pressed
+ // the coordinates of the bullet is according to the coordinates of the jet
+ if (pad.check_event(Gamepad::A_PRESSED) == true)
+ {
+ pad.tone(1000.0,0.1);
+ Vector2D Jet_pos = _Jet.get_pos();
+ //printf("x=%f,y=%f\n", Jet_pos.x, Jet_pos.y);
+ _Ammo.init(Jet_pos.x+7, Jet_pos.y+5);
+ _A = 1;
+ }
+}
+
+//function to check if the jet crashs
+void GameEngine::check_Jet_collision(Gamepad &pad)
+{
+ Vector2D Jet_pos = _Jet.get_pos();
+ Vector2D Monster_pos = _Monster.get_pos();
+ //printf("Jet_x=%f,Jet_y=%f\n",Jet_pos.x,Jet_pos.y);
+ //printf("M_x=%f,M_y=%f\n",Monster_pos.x, Monster_pos.y);
+
+ // game over when the monster hits the jet
+ if(
+ (Jet_pos.x+13 > Monster_pos.x)&& // right
+ (Jet_pos.x < Monster_pos.x+10)&& // left
+ (Jet_pos.y+12 > Monster_pos.y)&& // top
+ (Jet_pos.y < Monster_pos.y+10)) // bottom
+ {
+ life -= 1;
+ _Monster.init();
+ }
+}
+
+//function to check if the monster is killed
+void GameEngine::check_hit_monster(Gamepad &pad)
+{
+ Vector2D Ammo_pos = _Ammo.get_pos();
+ Vector2D Monster_pos = _Monster.get_pos();
+
+ // monster diappears if the bullet hits the monster
+ // set new monster
+ if(
+ (Ammo_pos.x+1 > Monster_pos.x)&&
+ (Ammo_pos.y+1 >= Monster_pos.y)&&
+ (Ammo_pos.y+1< Monster_pos.y+10)&&
+ (_A ==1))
+ {
+ pad.tone(100.0,0.2);
+ pad.leds_off();
+ _A = 0; //Ammo disappears after hit the monster
+ monster_number -= 1;
+ _Monster.init();
+ _Jet.~Jet();
+ }
+ // monster reaches the left edge of the screen
+ // can miss 3 monsters maximum
+ else if (Monster_pos.x+9 <= 1)
+ {
+ life -= 1;
+ pad.tone(300.0,0.2);
+ _Monster.init();
+ }
+}
+
+//function to check if the monster hits the wall
+void GameEngine::check_hit_wall(Gamepad &pad)
+{
+ Vector2D Monster_pos = _Monster.get_pos();
+ Vector2D Monster_velocity = _Monster.get_velocity();
+
+ // the monster bounces back when it hits the wall
+ if(Monster_pos.y <= 0)
+ {
+ Monster_pos.y = 0; // top
+ Monster_velocity.y = -Monster_velocity.y;
+ pad.tone(500.0,0.2);
+ }
+ else if(Monster_pos.y >= HEIGHT - 8)
+ {
+ Monster_pos.y = HEIGHT - 8; // bottom
+ Monster_velocity.y = -Monster_velocity.y;
+ pad.tone(500.0,0.2);
+ }
+ _Monster.set_velocity(Monster_velocity); // set velocity
+ _Monster.set_pos(Monster_pos); //monster stays on the screen
+}
+
+//function to get the value of life
+int GameEngine::get_life()
+{
+ return life;
+}
+
+//function to get the monster number
+int GameEngine::get_monster_number()
+{
+ return monster_number;
+}
\ No newline at end of file