1 | /*
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2 |
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3 | TFT Pong
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4 |
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5 | This example for the Arduino screen reads the values
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6 | of 2 potentiometers to move a rectangular platform
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7 | on the x and y axes. The platform can intersect
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8 | with a ball causing it to bounce.
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9 |
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10 | This example code is in the public domain.
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11 |
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12 | Created by Tom Igoe December 2012
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13 | Modified 15 April 2013 by Scott Fitzgerald
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14 |
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15 | http://arduino.cc/en/Tutorial/TFTPong
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16 |
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17 | */
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18 |
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19 | #include <TFT.h> // Arduino LCD library
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20 | #include <SPI.h>
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21 |
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22 | // pin definition for the Uno
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23 | #define cs 10
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24 | #define dc 9
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25 | #define rst 8
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26 |
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27 | // pin definition for the Leonardo
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28 | // #define cs 7
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29 | // #define dc 0
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30 | // #define rst 1
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31 |
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32 | TFT TFTscreen = TFT(cs, dc, rst);
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33 |
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34 | // variables for the position of the ball and paddle
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35 | int paddleX = 0;
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36 | int paddleY = 0;
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37 | int oldPaddleX, oldPaddleY;
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38 | int ballDirectionX = 1;
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39 | int ballDirectionY = 1;
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40 |
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41 | int ballSpeed = 10; // lower numbers are faster
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42 |
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43 | int ballX, ballY, oldBallX, oldBallY;
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44 |
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45 | void setup() {
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46 | // initialize the display
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47 | TFTscreen.begin();
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48 | // black background
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49 | TFTscreen.background(0, 0, 0);
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50 | }
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51 |
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52 | void loop() {
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53 |
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54 | // save the width and height of the screen
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55 | int myWidth = TFTscreen.width();
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56 | int myHeight = TFTscreen.height();
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57 |
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58 | // map the paddle's location to the position of the potentiometers
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59 | paddleX = map(analogRead(A0), 512, -512, 0, myWidth) - 20 / 2;
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60 | paddleY = map(analogRead(A1), 512, -512, 0, myHeight) - 5 / 2;
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61 |
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62 | // set the fill color to black and erase the previous
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63 | // position of the paddle if different from present
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64 | TFTscreen.fill(0, 0, 0);
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65 |
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66 | if (oldPaddleX != paddleX || oldPaddleY != paddleY) {
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67 | TFTscreen.rect(oldPaddleX, oldPaddleY, 20, 5);
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68 | }
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69 |
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70 | // draw the paddle on screen, save the current position
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71 | // as the previous.
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72 | TFTscreen.fill(255, 255, 255);
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73 |
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74 | TFTscreen.rect(paddleX, paddleY, 20, 5);
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75 | oldPaddleX = paddleX;
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76 | oldPaddleY = paddleY;
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77 |
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78 | // update the ball's position and draw it on screen
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79 | if (millis() % ballSpeed < 2) {
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80 | moveBall();
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81 | }
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82 | }
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83 |
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84 | // this function determines the ball's position on screen
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85 | void moveBall() {
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86 | // if the ball goes offscreen, reverse the direction:
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87 | if (ballX > TFTscreen.width() || ballX < 0) {
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88 | ballDirectionX = -ballDirectionX;
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89 | }
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90 |
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91 | if (ballY > TFTscreen.height() || ballY < 0) {
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92 | ballDirectionY = -ballDirectionY;
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93 | }
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94 |
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95 | // check if the ball and the paddle occupy the same space on screen
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96 | if (inPaddle(ballX, ballY, paddleX, paddleY, 20, 5)) {
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97 | ballDirectionX = -ballDirectionX;
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98 | ballDirectionY = -ballDirectionY;
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99 | }
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100 |
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101 | // update the ball's position
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102 | ballX += ballDirectionX;
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103 | ballY += ballDirectionY;
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104 |
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105 | // erase the ball's previous position
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106 | TFTscreen.fill(0, 0, 0);
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107 |
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108 | if (oldBallX != ballX || oldBallY != ballY) {
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109 | TFTscreen.rect(oldBallX, oldBallY, 5, 5);
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110 | }
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111 |
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112 |
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113 | // draw the ball's current position
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114 | TFTscreen.fill(255, 255, 255);
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115 | TFTscreen.rect(ballX, ballY, 5, 5);
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116 |
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117 | oldBallX = ballX;
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118 | oldBallY = ballY;
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119 |
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120 | }
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121 |
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122 | // this function checks the position of the ball
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123 | // to see if it intersects with the paddle
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124 | boolean inPaddle(int x, int y, int rectX, int rectY, int rectWidth, int rectHeight) {
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125 | boolean result = false;
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126 |
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127 | if ((x >= rectX && x <= (rectX + rectWidth)) &&
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128 | (y >= rectY && y <= (rectY + rectHeight))) {
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129 | result = true;
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130 | }
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131 |
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132 | return result;
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133 | }
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134 |
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135 |
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