Calibrating and Coding Your Arduino Touchscreen

2nd December 2020

Published by Bob at 3rd January 2021

Coding Games on an ILI9341 SPI LCD Touchscreen with Arduino

Breakout Code

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include "XPT2046_Touchscreen.h"
#include "Math.h"

// function declarations
boolean checkCollision(int x1, int y1, int width1, int height1, int x2, int y2, int width2, int height2);

// For the Adafruit shield, these are the default.
#define TFT_CS 10
#define TFT_DC 9
#define TFT_MOSI 11
#define TFT_CLK 13
#define TFT_RST 8
#define TFT_MISO 12

#define TS_CS 7

#define ROTATION 3


// Use hardware SPI (on Uno, #13, #12, #11) and the above for CS/DC/RST
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
XPT2046_Touchscreen ts(TS_CS);

float xCalM = 0.0, yCalM = 0.0;
float xCalC = 0.0, yCalC = 0.0;
float xPos = 0.0, yPos = 0.0;
float xPosLast = 0.0, yPosLast = 0.0;
float xVel = 0.0, yVel = 0.0;
int8_t topBorder = 20;
int8_t batWidth = 30;
int8_t batHeight = 7;
int16_t batX = 0, batY = 0;
int8_t ballSize = 3;
int playerLives = 3;
int playerScore = 0;
int gameState = 1; // 1=start 2=playing 3=gameover
int level;

int16_t tftWidth = 0, tftHeight = 0;

class ScreenPoint {
public:
int16_t x;
int16_t y;

ScreenPoint(){
// default contructor
}

ScreenPoint(int16_t xIn, int16_t yIn){
x = xIn;
y = yIn;
}
};

class Block {
public:
int x;
int y;
int width;
int height;
int colour;
int score;
boolean isActive;

// default constructor
Block(){}

Block(int xpos, int ypos, int bwidth, int bheight, int bcol, int bscore){
x = xpos;
y = ypos;
width = bwidth;
height = bheight;
colour = bcol;
score = bscore;
isActive = true;
drawBlock();
}

void drawBlock(){
tft.fillRect(x,y,width,height,colour);
}

void removeBlock(){
tft.fillRect(x,y,width,height,ILI9341_BLACK);
isActive = false;
}

boolean isHit(float x1,float y1, int w1,int h1){
if (checkCollision((int)round(x1),(int)round(y1),w1,h1,x,y,width,height)){
return true;
}
else {
return false;
}
}
};
Block blocks[5][16];

ScreenPoint getScreenCoords(int16_t x, int16_t y){
int16_t xCoord = round((x * xCalM) + xCalC);
int16_t yCoord = round((y * yCalM) + yCalC);
if(xCoord &lt; 0) xCoord = 0;
if(xCoord &gt;= tftWidth) xCoord = tftWidth - 1;
if(yCoord &lt; 0) yCoord = 0;
if(yCoord &gt;= tftHeight) yCoord = tftHeight - 1;
return(ScreenPoint(xCoord, yCoord));
}

void calibrateTouchScreen(){
TS_Point p;
int16_t x1,y1,x2,y2;

tft.fillScreen(ILI9341_BLACK);
// wait for no touch
while(ts.touched());
tft.drawFastHLine(10,20,20,ILI9341_RED);
tft.drawFastVLine(20,10,20,ILI9341_RED);
while(!ts.touched());
p = ts.getPoint();
x1 = p.x;
y1 = p.y;
tft.drawFastHLine(10,20,20,ILI9341_BLACK);
tft.drawFastVLine(20,10,20,ILI9341_BLACK);
delay(500);
while(ts.touched());
tft.drawFastHLine(tftWidth - 30,tftHeight - 20,20,ILI9341_RED);
tft.drawFastVLine(tftWidth - 20,tftHeight - 30,20,ILI9341_RED);
while(!ts.touched());
p = ts.getPoint();
x2 = p.x;
y2 = p.y;
tft.drawFastHLine(tftWidth - 30,tftHeight - 20,20,ILI9341_BLACK);
tft.drawFastVLine(tftWidth - 20,tftHeight - 30,20,ILI9341_BLACK);

int16_t xDist = tftWidth - 40;
int16_t yDist = tftHeight - 40;

// translate in form pos = m x val + c
// x
xCalM = (float)xDist / (float)(x2 - x1);
xCalC = 20.0 - ((float)x1 * xCalM);
// y
yCalM = (float)yDist / (float)(y2 - y1);
yCalC = 20.0 - ((float)y1 * yCalM);

Serial.print("x1 = ");Serial.print(x1);
Serial.print(", y1 = ");Serial.print(y1);
Serial.print("x2 = ");Serial.print(x2);
Serial.print(", y2 = ");Serial.println(y2);
Serial.print("xCalM = ");Serial.print(xCalM);
Serial.print(", xCalC = ");Serial.print(xCalC);
Serial.print("yCalM = ");Serial.print(yCalM);
Serial.print(", yCalC = ");Serial.println(yCalC);

}


void setup() {
Serial.begin(9600);

// avoid chip select contention
pinMode(TS_CS, OUTPUT);
digitalWrite(TS_CS, HIGH);
pinMode(TFT_CS, OUTPUT);
digitalWrite(TFT_CS, HIGH);

tft.begin();
tft.setRotation(ROTATION);
tft.fillScreen(ILI9341_BLACK);
tftWidth = tft.width();
tftHeight = tft.height();
ts.begin();
ts.setRotation(ROTATION);
calibrateTouchScreen();

batY = tftHeight - batHeight -30;
}

void initGame(){

tft.fillScreen(ILI9341_BLACK);
tft.drawFastHLine(0, topBorder-1, tftWidth, ILI9341_BLUE);
tft.setCursor(0,5);
tft.setTextSize(1);
tft.setTextColor(ILI9341_WHITE);
tft.print("SCORE :");
tft.setCursor((tftWidth/2), 5);
tft.print("LIVES :");
tft.setCursor(tftWidth - 75, 5);
tft.print("LEVEL :");

batY = tftHeight - batHeight -30;
playerLives = 3;
playerScore = 0;
level = 0;

drawLives();
drawScore();
drawLevel();

initGameBoard();

}

void initGameBoard() {
int row, col;
int colour, score;
clearOldBallPos();
xPosLast = xPos = 0;
yPosLast = yPos = 90;
xVel = 2;
yVel = 2 + (level);
gameState = 2;

for(row=0; row &lt; 5; row++){
for (col=0; col &lt; 16; col++){
switch(row){
case 0:
case 1:
colour = ILI9341_BLUE;
score = 50;
break;
case 2:
case 3:
colour = ILI9341_MAGENTA;
score = 30;
break;
case 4:
case 5:
colour = ILI9341_YELLOW;
score = 10;
break;
}
blocks[row][col] = Block(col*20, (row*10) + 30, 19, 9,colour,score);
}
}

}

void clearOldBallPos(){
tft.fillCircle(round(xPosLast), round(yPosLast), ballSize, ILI9341_BLACK);
}

void moveBall(){
float newX, newY;
newX = xPos + xVel;
newY = yPos + yVel;
if (newX &lt; (float)ballSize){
newX = (float)ballSize;
xVel = -xVel;
}
if (newX &gt; (float)(tftWidth - ballSize - 1)){
newX = (float)(tftWidth - ballSize - 1);
xVel = -xVel;
}
if (newY &lt; topBorder + (float)ballSize){
newY = topBorder + (float)ballSize;
yVel = -yVel;
}
if ((round(newX) != round(xPosLast)) || (round(newY) != round(yPosLast))){
// draw ball
clearOldBallPos();
tft.fillCircle(round(newX), round(newY), ballSize, ILI9341_GREEN);
xPosLast = newX;
yPosLast = newY;
}
xPos = newX;
yPos = newY;
}

void drawScore(){
// clear old score
tft.fillRect(50,5,25,10,ILI9341_BLACK);
// print new score
tft.setCursor(50,5);
tft.setTextSize(1);
tft.setTextColor(ILI9341_WHITE);
tft.print(playerScore);
}

void drawLives(){
// clear old lives
tft.fillRect((tftWidth/2)+50,5,25,10,ILI9341_BLACK);
// print new score
tft.setCursor((tftWidth/2)+50,5);
tft.setTextSize(1);
tft.setTextColor(ILI9341_WHITE);
tft.print(playerLives);
}

void drawLevel(){
// clear old level
tft.fillRect(tftWidth-25,5,25,10,ILI9341_BLACK);
// print new score
tft.setCursor(tftWidth-25,5);
tft.setTextSize(1);
tft.setTextColor(ILI9341_WHITE);
tft.print(level + 1);
}

void newBall(){
xPos = 0;
yPos = 90;
xVel = yVel = 2;
moveBall();
delay(1000);
}

boolean checkBallLost(){
if (yPos &gt; tftHeight + ballSize){
return true;
}
else {
return false;
}
}

void moveBat(){
int16_t newBatX;
ScreenPoint sp = ScreenPoint(0,0);
if (ts.touched()) {
TS_Point p = ts.getPoint();
sp = getScreenCoords(p.x, p.y);
newBatX = sp.x - (batWidth / 2);
if (newBatX &lt; 0) newBatX = 0;
if (newBatX &gt;= (tftWidth - batWidth)) newBatX = tftWidth - 1 - batWidth;
}
if (abs(newBatX - batX) &gt; 4){
tft.fillRect(batX, batY, batWidth, batHeight,ILI9341_BLACK);
batX = newBatX;
tft.fillRect(batX, batY, batWidth, batHeight,ILI9341_RED);
}
}

// bounding box collision detection
boolean checkCollision(int x1, int y1, int width1, int height1, int x2, int y2, int width2, int height2){
boolean hit = false;
if (
(((x2 + width2) &gt;= x1) &amp;&amp; (x2 &lt;= (x1 + width1)))
&amp;&amp; (((y2 + height2) &gt;= y1) &amp;&amp; (y2 &lt;= (y1 + height1)))
) {
hit = true;
}

return hit;
}

void checkHitBat(){
// check bat and bottom half of ball
float xInc;
boolean hit = checkCollision(batX, batY, batWidth, batHeight, (int)round(xPos)-ballSize, (int)round(yPos), ballSize*2, ballSize);
if (hit) {
// reverse ball y direction but increase speed
yVel += 0.05;
if (yVel &gt; 5){
yVel = 5;
}
yVel = -yVel;
// rounded bounce
xInc = (xPos - (float)(batX + (batWidth / 2))) / (float)batWidth;
xVel += 6 * xInc;
if (abs(xVel) &gt; 6){
if (xVel &lt; 0) {
xVel = -6;
}
else {
xVel = 6;
}
}
// make sure ball not hitting bat
yPos = (float)(batY - ballSize -1);
}
}

void checkHitBlock(){
int row, col;
for (row=0; row&lt;5; row++){
for (col=0; col&lt;16; col++){
if (blocks[row][col].isActive &amp;&amp; blocks[row][col].isHit(xPos,yPos, ballSize*2,ballSize*2)){
blocks[row][col].removeBlock();
playerScore += blocks[row][col].score;
drawScore();
yVel = -yVel;
return;
}
}
}
}

boolean checkAllBlocksHit(){
int row, col, actives;
actives = 0;
for (row=0; row&lt;5; row++){
for (col=0; col&lt;16; col++){
if (blocks[row][col].isActive){
return false;
}
}
}

return true; 
}

unsigned long lastFrame = millis();

void loop(void) {

// limit frame rate
while((millis() - lastFrame) &lt; 20);
lastFrame = millis();

switch(gameState){
case 1: // start
gameState = 11;
break;

case 11: // click to play
tft.fillRect((tftWidth/2)-100,(tftHeight/2)-20,200,40,ILI9341_GREEN);
tft.setCursor((tftWidth/2)-100+25,(tftHeight/2)-20+12);
tft.setTextSize(2);
tft.setTextColor(ILI9341_WHITE);
tft.print("CLICK TO PLAY");
gameState = 12;
break;

case 12: // wait for click to play
if (ts.touched()) {
TS_Point p = ts.getPoint();
ScreenPoint sp = getScreenCoords(p.x, p.y);
if (checkCollision(sp.x, sp.y,1,1,(tftWidth/2)-50,(tftHeight/2)-20,100,40)){
initGame();
gameState = 2;
}
}
break;

case 2: // play

moveBall();
moveBat();
checkHitBat();
checkHitBlock();
if (checkBallLost()){
playerLives --;
drawLives();
if (playerLives &gt; 0){
newBall();
}
else {
gameState = 3; // end game
}
}

if (checkAllBlocksHit()){
gameState = 4;
}

break;

case 4: // new blocks
delay(1000);
level ++;
drawLevel();
initGameBoard();
break;

case 3: // end
tft.fillScreen(ILI9341_BLACK);
tft.setCursor((tftWidth/2)-150,50);
tft.setTextSize(3);
tft.setTextColor(ILI9341_WHITE);
tft.print("You Scored ");
tft.print(playerScore);
gameState = 11; // click to play
break;
}




}

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

#include "SPI.h"

#include "Adafruit_GFX.h"

#include "Adafruit_ILI9341.h"

#include "XPT2046_Touchscreen.h"

#include "Math.h"

// function declarations

boolean checkCollision(int x1, int y1, int width1, int height1, int x2, int y2, int width2, int height2);

// For the Adafruit shield, these are the default.

#define TFT_CS 10

#define TFT_DC 9

#define TFT_MOSI 11

#define TFT_CLK 13

#define TFT_RST 8

#define TFT_MISO 12

#define TS_CS 7

#define ROTATION 3

// Use hardware SPI (on Uno, #13, #12, #11) and the above for CS/DC/RST

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

XPT2046_Touchscreen ts(TS_CS);

float xCalM = 0.0, yCalM = 0.0;

float xCalC = 0.0, yCalC = 0.0;

float xPos = 0.0, yPos = 0.0;

float xPosLast = 0.0, yPosLast = 0.0;

float xVel = 0.0, yVel = 0.0;

int8_t topBorder = 20;

int8_t batWidth = 30;

int8_t batHeight = 7;

int16_t batX = 0, batY = 0;

int8_t ballSize = 3;

int playerLives = 3;

int playerScore = 0;

int gameState = 1; // 1=start 2=playing 3=gameover

int level;

int16_t tftWidth = 0, tftHeight = 0;

class ScreenPoint {

public:

int16_t x;

int16_t y;

ScreenPoint(){

// default contructor

}

ScreenPoint(int16_t xIn, int16_t yIn){

x = xIn;

y = yIn;

}

};

class Block {

public:

int x;

int y;

int width;

int height;

int colour;

int score;

boolean isActive;

// default constructor

Block(){}

Block(int xpos, int ypos, int bwidth, int bheight, int bcol, int bscore){

x = xpos;

y = ypos;

width = bwidth;

height = bheight;

colour = bcol;

score = bscore;

isActive = true;

drawBlock();

}

void drawBlock(){

tft.fillRect(x,y,width,height,colour);

}

void removeBlock(){

tft.fillRect(x,y,width,height,ILI9341_BLACK);

isActive = false;

}

boolean isHit(float x1,float y1, int w1,int h1){

if (checkCollision((int)round(x1),(int)round(y1),w1,h1,x,y,width,height)){

return true;

}

else {

return false;

}

};

Block blocks[5][16];

ScreenPoint getScreenCoords(int16_t x, int16_t y){

int16_t xCoord = round((x * xCalM) + xCalC);

int16_t yCoord = round((y * yCalM) + yCalC);

if(xCoord < 0) xCoord = 0;

if(xCoord >= tftWidth) xCoord = tftWidth - 1;

if(yCoord < 0) yCoord = 0;

if(yCoord >= tftHeight) yCoord = tftHeight - 1;

return(ScreenPoint(xCoord, yCoord));

}

void calibrateTouchScreen(){

TS_Point p;

int16_t x1,y1,x2,y2;

tft.fillScreen(ILI9341_BLACK);

// wait for no touch

while(ts.touched());

tft.drawFastHLine(10,20,20,ILI9341_RED);

tft.drawFastVLine(20,10,20,ILI9341_RED);

while(!ts.touched());

p = ts.getPoint();

x1 = p.x;

y1 = p.y;

tft.drawFastHLine(10,20,20,ILI9341_BLACK);

tft.drawFastVLine(20,10,20,ILI9341_BLACK);

delay(500);

while(ts.touched());

tft.drawFastHLine(tftWidth - 30,tftHeight - 20,20,ILI9341_RED);

tft.drawFastVLine(tftWidth - 20,tftHeight - 30,20,ILI9341_RED);

while(!ts.touched());

p = ts.getPoint();

x2 = p.x;

y2 = p.y;

tft.drawFastHLine(tftWidth - 30,tftHeight - 20,20,ILI9341_BLACK);

tft.drawFastVLine(tftWidth - 20,tftHeight - 30,20,ILI9341_BLACK);

int16_t xDist = tftWidth - 40;

int16_t yDist = tftHeight - 40;

// translate in form pos = m x val + c

// x

xCalM = (float)xDist / (float)(x2 - x1);

xCalC = 20.0 - ((float)x1 * xCalM);

// y

yCalM = (float)yDist / (float)(y2 - y1);

yCalC = 20.0 - ((float)y1 * yCalM);

Serial.print("x1 = ");Serial.print(x1);

Serial.print(", y1 = ");Serial.print(y1);

Serial.print("x2 = ");Serial.print(x2);

Serial.print(", y2 = ");Serial.println(y2);

Serial.print("xCalM = ");Serial.print(xCalM);

Serial.print(", xCalC = ");Serial.print(xCalC);

Serial.print("yCalM = ");Serial.print(yCalM);

Serial.print(", yCalC = ");Serial.println(yCalC);

}

void setup() {

Serial.begin(9600);

// avoid chip select contention

pinMode(TS_CS, OUTPUT);

digitalWrite(TS_CS, HIGH);

pinMode(TFT_CS, OUTPUT);

digitalWrite(TFT_CS, HIGH);

tft.begin();

tft.setRotation(ROTATION);

tft.fillScreen(ILI9341_BLACK);

tftWidth = tft.width();

tftHeight = tft.height();

ts.begin();

ts.setRotation(ROTATION);

calibrateTouchScreen();

batY = tftHeight - batHeight -30;

}

void initGame(){

tft.fillScreen(ILI9341_BLACK);

tft.drawFastHLine(0, topBorder-1, tftWidth, ILI9341_BLUE);

tft.setCursor(0,5);

tft.setTextSize(1);

tft.setTextColor(ILI9341_WHITE);

tft.print("SCORE :");

tft.setCursor((tftWidth/2), 5);

tft.print("LIVES :");

tft.setCursor(tftWidth - 75, 5);

tft.print("LEVEL :");

batY = tftHeight - batHeight -30;

playerLives = 3;

playerScore = 0;

level = 0;

drawLives();

drawScore();

drawLevel();

initGameBoard();

}

void initGameBoard() {

int row, col;

int colour, score;

clearOldBallPos();

xPosLast = xPos = 0;

yPosLast = yPos = 90;

xVel = 2;

yVel = 2 + (level);

gameState = 2;

for(row=0; row < 5; row++){

for (col=0; col < 16; col++){

switch(row){

case 0:

case 1:

colour = ILI9341_BLUE;

score = 50;

break;

case 2:

case 3:

colour = ILI9341_MAGENTA;

score = 30;

break;

case 4:

case 5:

colour = ILI9341_YELLOW;

score = 10;

break;

}

blocks[row][col] = Block(col*20, (row*10) + 30, 19, 9,colour,score);

}

void clearOldBallPos(){

tft.fillCircle(round(xPosLast), round(yPosLast), ballSize, ILI9341_BLACK);

}

void moveBall(){

float newX, newY;

newX = xPos + xVel;

newY = yPos + yVel;

if (newX < (float)ballSize){

newX = (float)ballSize;

xVel = -xVel;

}

if (newX > (float)(tftWidth - ballSize - 1)){

newX = (float)(tftWidth - ballSize - 1);

xVel = -xVel;

}

if (newY < topBorder + (float)ballSize){

newY = topBorder + (float)ballSize;

yVel = -yVel;

}

if ((round(newX) != round(xPosLast)) || (round(newY) != round(yPosLast))){

// draw ball

clearOldBallPos();

tft.fillCircle(round(newX), round(newY), ballSize, ILI9341_GREEN);

xPosLast = newX;

yPosLast = newY;

}

xPos = newX;

yPos = newY;

}

void drawScore(){

// clear old score

tft.fillRect(50,5,25,10,ILI9341_BLACK);

// print new score

tft.setCursor(50,5);

tft.setTextSize(1);

tft.setTextColor(ILI9341_WHITE);

tft.print(playerScore);

}

void drawLives(){

// clear old lives

tft.fillRect((tftWidth/2)+50,5,25,10,ILI9341_BLACK);

// print new score

tft.setCursor((tftWidth/2)+50,5);

tft.setTextSize(1);

tft.setTextColor(ILI9341_WHITE);

tft.print(playerLives);

}

void drawLevel(){

// clear old level

tft.fillRect(tftWidth-25,5,25,10,ILI9341_BLACK);

// print new score

tft.setCursor(tftWidth-25,5);

tft.setTextSize(1);

tft.setTextColor(ILI9341_WHITE);

tft.print(level + 1);

}

void newBall(){

xPos = 0;

yPos = 90;

xVel = yVel = 2;

moveBall();

delay(1000);

}

boolean checkBallLost(){

if (yPos > tftHeight + ballSize){

return true;

}

else {

return false;

}

void moveBat(){

int16_t newBatX;

ScreenPoint sp = ScreenPoint(0,0);

if (ts.touched()) {

TS_Point p = ts.getPoint();

sp = getScreenCoords(p.x, p.y);

newBatX = sp.x - (batWidth / 2);

if (newBatX < 0) newBatX = 0;

if (newBatX >= (tftWidth - batWidth)) newBatX = tftWidth - 1 - batWidth;

}

if (abs(newBatX - batX) > 4){

tft.fillRect(batX, batY, batWidth, batHeight,ILI9341_BLACK);

batX = newBatX;

tft.fillRect(batX, batY, batWidth, batHeight,ILI9341_RED);

}

// bounding box collision detection

boolean checkCollision(int x1, int y1, int width1, int height1, int x2, int y2, int width2, int height2){

boolean hit = false;

if (

(((x2 + width2) >= x1) && (x2 <= (x1 + width1)))

&& (((y2 + height2) >= y1) && (y2 <= (y1 + height1)))

) {

hit = true;

}

return hit;

}

void checkHitBat(){

// check bat and bottom half of ball

float xInc;

boolean hit = checkCollision(batX, batY, batWidth, batHeight, (int)round(xPos)-ballSize, (int)round(yPos), ballSize*2, ballSize);

if (hit) {

// reverse ball y direction but increase speed

yVel += 0.05;

if (yVel > 5){

yVel = 5;

}

yVel = -yVel;

// rounded bounce

xInc = (xPos - (float)(batX + (batWidth / 2))) / (float)batWidth;

xVel += 6 * xInc;

if (abs(xVel) > 6){

if (xVel < 0) {

xVel = -6;

}

else {

xVel = 6;

}

// make sure ball not hitting bat

yPos = (float)(batY - ballSize -1);

}

void checkHitBlock(){

int row, col;

for (row=0; row<5; row++){

for (col=0; col<16; col++){

if (blocks[row][col].isActive && blocks[row][col].isHit(xPos,yPos, ballSize*2,ballSize*2)){

blocks[row][col].removeBlock();

playerScore += blocks[row][col].score;

drawScore();

yVel = -yVel;

return;

}

boolean checkAllBlocksHit(){

int row, col, actives;

actives = 0;

for (row=0; row<5; row++){

for (col=0; col<16; col++){

if (blocks[row][col].isActive){

return false;

}

return true;

}

unsigned long lastFrame = millis();

void loop(void) {

// limit frame rate

while((millis() - lastFrame) < 20);

lastFrame = millis();

switch(gameState){

case 1: // start

gameState = 11;

break;

case 11: // click to play

tft.fillRect((tftWidth/2)-100,(tftHeight/2)-20,200,40,ILI9341_GREEN);

tft.setCursor((tftWidth/2)-100+25,(tftHeight/2)-20+12);

tft.setTextSize(2);

tft.setTextColor(ILI9341_WHITE);

tft.print("CLICK TO PLAY");

gameState = 12;

break;

case 12: // wait for click to play

if (ts.touched()) {

TS_Point p = ts.getPoint();

ScreenPoint sp = getScreenCoords(p.x, p.y);

if (checkCollision(sp.x, sp.y,1,1,(tftWidth/2)-50,(tftHeight/2)-20,100,40)){

initGame();

gameState = 2;

}

break;

case 2: // play

moveBall();

moveBat();

checkHitBat();

checkHitBlock();

if (checkBallLost()){

playerLives --;

drawLives();

if (playerLives > 0){

newBall();

}

else {

gameState = 3; // end game

}

if (checkAllBlocksHit()){

gameState = 4;

}

break;

case 4: // new blocks

delay(1000);

level ++;

drawLevel();

initGameBoard();

break;

case 3: // end

tft.fillScreen(ILI9341_BLACK);

tft.setCursor((tftWidth/2)-150,50);

tft.setTextSize(3);

tft.setTextColor(ILI9341_WHITE);

tft.print("You Scored ");

tft.print(playerScore);

gameState = 11; // click to play

break;

}

Calibrating and Coding Your Arduino Touchscreen

Coding Games on an ILI9341 SPI LCD Touchscreen with Arduino

Breakout Code

Links

Bob

Related posts

Calibrating and Coding Your Arduino Touchscreen

Basic Animation on Your SPI TFT Touchscreen and Arduino

Connecting an SPI TFT Touchscreen to Your Arduino