/*
  * Pong
  * Original Code from https://github.com/rparrett/pongclock
  *
  */
 
 #define BLACK 0x0000
 #define WHITE 0xFFFF
 #define GREY  0x5AEB
 
 #include <TFT_eSPI.h> // Graphics and font library for ST7735 driver chip
 #include <SPI.h>
 
 TFT_eSPI tft = TFT_eSPI();  // Invoke library, pins defined in User_Setup.h
 
 int16_t h = 128;
 int16_t w = 160;
 
 int dly = 10;
 
 int16_t paddle_h = 25;
 int16_t paddle_w = 2;
 
 int16_t lpaddle_x = 0;
 int16_t rpaddle_x = w - paddle_w;
 
 int16_t lpaddle_y = 0;
 int16_t rpaddle_y = h - paddle_h;
 
 int16_t lpaddle_d = 1;
 int16_t rpaddle_d = -1;
 
 int16_t lpaddle_ball_t = w - w / 4;
 int16_t rpaddle_ball_t = w / 4;
 
 int16_t target_y = 0;
 
 int16_t ball_x = 2;
 int16_t ball_y = 2;
 int16_t oldball_x = 2;
 int16_t oldball_y = 2;
 
 int16_t ball_dx = 1;
 int16_t ball_dy = 1;
 
 int16_t ball_w = 4;
 int16_t ball_h = 4;
 
 int16_t dashline_h = 4;
 int16_t dashline_w = 2;
 int16_t dashline_n = h / dashline_h;
 int16_t dashline_x = w / 2 - 1;
 int16_t dashline_y = dashline_h / 2;
 
 int16_t lscore = 12;
 int16_t rscore = 4;
 
 void setup(void) {
   
   randomSeed(analogRead(0)*analogRead(1));
    
   tft.init();
 
   tft.setRotation(1);
 
   tft.fillScreen(BLACK);
   
   initgame();
 
   tft.setTextColor(WHITE, BLACK);
 
   delay(2000);
   
 }
 
 void loop() {
   delay(dly);
 
   lpaddle();
   rpaddle();
 
   midline();
 
   ball();
 }
 
 void initgame() {
   lpaddle_y = random(0, h - paddle_h);
   rpaddle_y = random(0, h - paddle_h);
 
   // ball is placed on the center of the left paddle
   ball_y = lpaddle_y + (paddle_h / 2);
   
   calc_target_y();
 
   midline();
 
   tft.fillRect(0,h-26,w,h-1,BLACK);
 
   tft.setTextDatum(TC_DATUM);
   tft.setTextColor(WHITE);
   tft.drawString("TFT_eSPI example", w/2, h-26 , 2);
 }
 
 void midline() {
 
   // If the ball is not on the line then don't redraw the line
   if ((ball_x<dashline_x-ball_w) && (ball_x > dashline_x+dashline_w)) return;
 
   tft.startWrite();
 
   // Quick way to draw a dashed line
   tft.setAddrWindow(dashline_x, 0, dashline_w, h);
   
   for(int16_t i = 0; i < dashline_n; i+=2) {
     tft.pushColor(WHITE, dashline_w*dashline_h); // push dash pixels
     tft.pushColor(BLACK, dashline_w*dashline_h); // push gap pixels
   }
 
   tft.endWrite();
 }
 
 void lpaddle() {
   
   if (lpaddle_d == 1) {
     tft.fillRect(lpaddle_x, lpaddle_y, paddle_w, 1, BLACK);
   } 
   else if (lpaddle_d == -1) {
     tft.fillRect(lpaddle_x, lpaddle_y + paddle_h - 1, paddle_w, 1, BLACK);
   }
 
   lpaddle_y = lpaddle_y + lpaddle_d;
 
   if (ball_dx == 1) lpaddle_d = 0;
   else {
     if (lpaddle_y + paddle_h / 2 == target_y) lpaddle_d = 0;
     else if (lpaddle_y + paddle_h / 2 > target_y) lpaddle_d = -1;
     else lpaddle_d = 1;
   }
 
   if (lpaddle_y + paddle_h >= h && lpaddle_d == 1) lpaddle_d = 0;
   else if (lpaddle_y <= 0 && lpaddle_d == -1) lpaddle_d = 0;
 
   tft.fillRect(lpaddle_x, lpaddle_y, paddle_w, paddle_h, WHITE);
 }
 
 void rpaddle() {
   
   if (rpaddle_d == 1) {
     tft.fillRect(rpaddle_x, rpaddle_y, paddle_w, 1, BLACK);
   } 
   else if (rpaddle_d == -1) {
     tft.fillRect(rpaddle_x, rpaddle_y + paddle_h - 1, paddle_w, 1, BLACK);
   }
 
   rpaddle_y = rpaddle_y + rpaddle_d;
 
   if (ball_dx == -1) rpaddle_d = 0;
   else {
     if (rpaddle_y + paddle_h / 2 == target_y) rpaddle_d = 0;
     else if (rpaddle_y + paddle_h / 2 > target_y) rpaddle_d = -1;
     else rpaddle_d = 1;
   }
 
   if (rpaddle_y + paddle_h >= h && rpaddle_d == 1) rpaddle_d = 0;
   else if (rpaddle_y <= 0 && rpaddle_d == -1) rpaddle_d = 0;
 
   tft.fillRect(rpaddle_x, rpaddle_y, paddle_w, paddle_h, WHITE);
 }
 
 void calc_target_y() {
   int16_t target_x;
   int16_t reflections;
   int16_t y;
 
   if (ball_dx == 1) {
     target_x = w - ball_w;
   } 
   else {
     target_x = -1 * (w - ball_w);
   }
 
   y = abs(target_x * (ball_dy / ball_dx) + ball_y);
 
   reflections = floor(y / h);
 
   if (reflections % 2 == 0) {
     target_y = y % h;
   } 
   else {
     target_y = h - (y % h);
   }
 }
 
 void ball() {
   ball_x = ball_x + ball_dx;
   ball_y = ball_y + ball_dy;
 
   if (ball_dx == -1 && ball_x == paddle_w && ball_y + ball_h >= lpaddle_y && ball_y <= lpaddle_y + paddle_h) {
     ball_dx = ball_dx * -1;
     dly = random(5); // change speed of ball after paddle contact
     calc_target_y(); 
   } else if (ball_dx == 1 && ball_x + ball_w == w - paddle_w && ball_y + ball_h >= rpaddle_y && ball_y <= rpaddle_y + paddle_h) {
     ball_dx = ball_dx * -1;
     dly = random(5); // change speed of ball after paddle contact
     calc_target_y();
   } else if ((ball_dx == 1 && ball_x >= w) || (ball_dx == -1 && ball_x + ball_w < 0)) {
     dly = 5;
   }
 
   if (ball_y > h - ball_w || ball_y < 0) {
     ball_dy = ball_dy * -1;
     ball_y += ball_dy; // Keep in bounds
   }
 
   //tft.fillRect(oldball_x, oldball_y, ball_w, ball_h, BLACK);
   tft.drawRect(oldball_x, oldball_y, ball_w, ball_h, BLACK); // Less TFT refresh aliasing than line above for large balls
   tft.fillRect(   ball_x,    ball_y, ball_w, ball_h, WHITE);
   oldball_x = ball_x;
   oldball_y = ball_y;
 }
 

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