Diff: PongEngine/PongEngine.cpp

Revision:

0:7423345f87c5

diff -r 000000000000 -r 7423345f87c5 PongEngine/PongEngine.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PongEngine/PongEngine.cpp	Fri Jan 31 12:32:38 2020 +0000
@@ -0,0 +1,174 @@
+#include "PongEngine.h"
+
+PongEngine::PongEngine()
+{
+
+}
+
+PongEngine::~PongEngine()
+{
+
+}
+
+void PongEngine::init(int paddle_width,int paddle_height,int ball_size,int speed)
+{
+    // initialise the game parameters
+    _paddle_width = paddle_width;
+    _paddle_height = paddle_height;
+    _ball_size = ball_size;
+    _speed = speed;
+
+    // x position on screen - WIDTH is defined in N5110.h
+    _p1x = GAP;
+    _p2x = WIDTH - GAP - _paddle_width;
+
+    // puts paddles and ball in middle
+    _p1.init(_p1x,_paddle_height,_paddle_width);
+    _p2.init(_p2x,_paddle_height,_paddle_width);
+    _ball.init(_ball_size,_speed);
+}
+
+void PongEngine::read_input(Gamepad &pad)
+{
+    _d = pad.get_direction();
+    _mag = pad.get_mag();
+}
+
+void PongEngine::draw(N5110 &lcd)
+{
+    // draw the elements in the LCD buffer
+    // pitch
+    lcd.drawRect(0,0,WIDTH,HEIGHT,FILL_TRANSPARENT);
+    lcd.drawLine(WIDTH/2,0,WIDTH/2,HEIGHT-1,2);
+    //score
+    print_scores(lcd);
+    // paddles
+    _p1.draw(lcd);
+    _p2.draw(lcd);
+    // ball
+    _ball.draw(lcd);
+}
+
+void PongEngine::update(Gamepad &pad)
+{
+    check_goal(pad);
+    // important to update paddles and ball before checking collisions so can
+    // correct for it before updating the display
+    _p1.update(_d,_mag);
+    _p2.update(_d,_mag);
+    _ball.update();
+
+    check_wall_collision(pad);
+    check_paddle_collisions(pad);
+}
+
+void PongEngine::check_wall_collision(Gamepad &pad)
+{
+    // read current ball attributes
+    Vector2D ball_pos = _ball.get_pos();
+    Vector2D ball_velocity = _ball.get_velocity();
+
+    // check if hit top wall
+    if (ball_pos.y <= 1) {  //  1 due to 1 pixel boundary
+        ball_pos.y = 1;  // bounce off ceiling without going off screen
+        ball_velocity.y = -ball_velocity.y;
+        // audio feedback
+        pad.tone(750.0,0.1);
+    }
+    // check if hit bottom wall
+    else if (ball_pos.y + _ball_size >= (HEIGHT-1) ) { // bottom pixel is 47
+        // hit bottom
+        ball_pos.y = (HEIGHT-1) - _ball_size;  // stops ball going off screen
+        ball_velocity.y = -ball_velocity.y;
+        // audio feedback
+        pad.tone(750.0,0.1);
+    }
+
+    // update ball parameters
+    _ball.set_velocity(ball_velocity);
+    _ball.set_pos(ball_pos);
+}
+
+void PongEngine::check_paddle_collisions(Gamepad &pad)
+{
+    // read current ball attributes
+    Vector2D ball_pos = _ball.get_pos();
+    Vector2D ball_velocity = _ball.get_velocity();
+
+    // check p1 first
+    Vector2D p1_pos = _p1.get_pos();
+
+    // see if ball has hit the paddle by checking for overlaps
+    if (
+        (ball_pos.y >= p1_pos.y) && //top
+        (ball_pos.y <= p1_pos.y + _paddle_height) && //bottom
+        (ball_pos.x >= _p1x) && //left
+        (ball_pos.x <= _p1x + _paddle_width)  //right
+    ) {
+        // if it has, fix position and reflect x velocity
+        ball_pos.x = _p1x + _paddle_width;
+        ball_velocity.x = -ball_velocity.x;
+        // audio feedback
+        pad.tone(1000.0,0.1);
+    }
+
+    // check p2 next
+    Vector2D p2_pos = _p2.get_pos();
+
+    // see if ball has hit the paddle by checking for overlaps
+    if (
+        (ball_pos.y >= p2_pos.y) && //top
+        (ball_pos.y <= p2_pos.y + _paddle_height) && //bottom
+        (ball_pos.x + _ball_size >= _p2x) && //left
+        (ball_pos.x + _ball_size <= _p2x + _paddle_width)  //right
+    ) {
+        // if it has, fix position and reflect x velocity
+        ball_pos.x = _p2x - _ball_size;
+        ball_velocity.x = -ball_velocity.x;
+        // audio feedback
+        pad.tone(1000.0,0.1);
+    }
+
+    // write new attributes
+    _ball.set_velocity(ball_velocity);
+    _ball.set_pos(ball_pos);
+}
+
+void PongEngine::check_goal(Gamepad &pad)
+{
+    Vector2D ball_pos = _ball.get_pos();
+    // P2 has scored
+    if (ball_pos.x + _ball_size < 0) {
+        _p2.add_score();
+        _ball.init(_ball_size,_speed);
+        pad.tone(1500.0,0.5);
+        pad.leds_on();
+        wait(0.5);
+        pad.leds_off();
+    }
+
+    // P1 has scored
+    if (ball_pos.x > WIDTH) {
+        _p1.add_score();
+        _ball.init(_ball_size,_speed);
+        pad.tone(1500.0,0.5);
+        pad.leds_on();
+        wait(0.5);
+        pad.leds_off();
+    }
+}
+
+void PongEngine::print_scores(N5110 &lcd)
+{
+    // get scores from paddles
+    int p1_score = _p1.get_score();
+    int p2_score = _p2.get_score();
+
+    // print to LCD i
+    char buffer1[14];
+    sprintf(buffer1,"%2d",p1_score);
+    lcd.printString(buffer1,WIDTH/2 - 20,1);  // font is 8 wide, so leave 4 pixel gape from middle assuming two digits
+    char buffer2[14];
+    sprintf(buffer2,"%2d",p2_score);
+    lcd.printString(buffer2,WIDTH/2 + 4,1);
+}
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