[136] | 1 | /*
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| 2 |
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| 3 | Esplora TFT EtchASketch
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| 4 |
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| 5 | This example for the Arduino TFT and Esplora draws
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| 6 | a white line on the screen, based on the position
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| 7 | of the joystick. To clear the screen, shake the
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| 8 | Esplora, using the values from the accelerometer.
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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 15 April 2013 by Scott Fitzgerald
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| 13 |
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| 14 | http://arduino.cc/en/Tutorial/EsploraTFTEtchASketch
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| 15 |
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| 16 | */
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| 17 |
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| 18 | #include <Esplora.h>
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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 | // initial position of the cursor
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| 23 | int xPos = EsploraTFT.width() / 2;
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| 24 | int yPos = EsploraTFT.height() / 2;
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| 25 |
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| 26 | void setup() {
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| 27 | // initialize the display
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| 28 | EsploraTFT.begin();
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| 29 |
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| 30 | // clear the background
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| 31 | EsploraTFT.background(0, 0, 0);
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| 32 | }
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| 33 |
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| 34 | void loop()
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| 35 | {
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| 36 |
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| 37 | int xAxis = Esplora.readJoystickX(); // read the X axis
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| 38 | int yAxis = Esplora.readJoystickY(); // read the Y axis
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| 39 |
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| 40 | // update the position of the line
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| 41 | // depending on the position of the joystick
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| 42 | if (xAxis < 10 && xAxis > -10) {
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| 43 | xPos = xPos;
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| 44 | }
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| 45 | else {
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| 46 | xPos = xPos + (map(xAxis, -512, 512, 2, -2));
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| 47 | }
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| 48 | if (yAxis < 10 && yAxis > -10) {
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| 49 | yAxis = yAxis;
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| 50 | }
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| 51 | else {
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| 52 | yPos = yPos + (map(yAxis, -512, 512, -2, 2));
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| 53 | }
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| 54 |
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| 55 | // don't let the point go past the screen edges
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| 56 | if (xPos > 159) {
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| 57 | (xPos = 159);
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| 58 | }
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| 59 |
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| 60 | if (xPos < 0) {
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| 61 | (xPos = 0);
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| 62 | }
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| 63 | if (yPos > 127) {
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| 64 | (yPos = 127);
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| 65 | }
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| 66 |
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| 67 | if (yPos < 0) {
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| 68 | (yPos = 0);
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| 69 | }
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| 70 |
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| 71 | // draw the point
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| 72 | EsploraTFT.stroke(255, 255, 255);
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| 73 | EsploraTFT.point(xPos, yPos);
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| 74 |
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| 75 | // check the accelerometer values and clear
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| 76 | // the screen if it is being shaken
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| 77 | if (abs(Esplora.readAccelerometer(X_AXIS)) > 200 || abs(Esplora.readAccelerometer(Y_AXIS)) > 200) {
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| 78 | EsploraTFT.background(0, 0, 0);
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| 79 | }
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| 80 |
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| 81 | delay(33);
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| 82 | }
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| 83 |
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