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README.md

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+# p5.joystick.js
+
+![p5.joystick Thumbnail](thumbnail.jpg)
+
+## Overview
+
+The **p5.joystick** library aims to facilitate integration with physical Joysticks.
+
+It also has an easy calibration system, allowing you to configure different types of joysticks with the standard button format.
+
+This library uses the [gamepad API](https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API/Using_the_Gamepad_API).
+
+Through them it is possible to read directly the status of each joystick. This library also make possible an event based approach.
+
+
+## Installation 
+
+It is necessary to insert p5.joystick.js in your html:
+```js
+<script src="js/p5.js"></script>
+<script src="p5.joystick.js"></script>
+<script src="sketch.js"></script>
+```
+
+### Usage
+
+```js
+var joystick;
+
+function setup() {
+  createCanvas(window.innerWidth, window.innerHeight);
+
+  joystick = createJoystick();
+  if(!joystick.calibrated())
+    joystick.calibrate(true);
+  joystick.onButtonPressed(onJoystick);
+  joystick.onButtonReleased(onJoystick);
+  joystick.onAxesPressed(onJoystick);
+  joystick.onAxesReleased(onJoystick);
+}
+
+function draw(){
+  background(100);
+  joystick.draw(width/2, height/2);
+}
+
+function onJoystick(e) {
+  console.log("onJoystick", e);
+}
+```
+
+## Calibrating
+
+Calibration associates each button on the virtual joystick with the physical joystick.
+You can make different combinations as you wish.
+
+The calibration is automatically saved and loaded into a cookie.
+
+![p5.joystick calibration process](calibration.gif)
+
+
+
+## Methods
+
+### createJoystick([debug])
+
+Initializes built-in listeners to integrate with gamepad API.
+
+| Parameter | Type | Required | Description |
+| -------- | -------- | -------- | -------- |
+| debug | Boolean | No | If `true`, adds html elements to monitor all connected joysticks and the state of each button. |
+
+### draw(x, y, [width], [height])
+
+Draws a joystick on the screen in the desired position and size.
+
+| Parameter | Type | Required | Description |
+| -------- | -------- | -------- | -------- |
+| x | Number | Yes | horizontal position on screen. |
+| y | Number | Yes | vertical position on the screen. |
+| width | Number | No | Width of the joystick. Standard value: 440. |
+| height | Number | No | Height of the joystick. Standard value: 200. |
+
+**Notice:** The drawing axis is centered, so the joystick is drawn around the x and y coordinates.
+
+### calibrate(enable)
+
+Enable/Disable calibration mode.
+
+| Parameter | Type | Required | Description |
+| -------- | -------- | -------- | -------- |
+| enable | Boolean | Yes | Enable/Disable calibration mode. |
+
+### getButtonPressedByName(name)
+
+Returns a boolean button state: `true` or `false`.
+
+
+| Parameter | Type | Required | Description |
+| -------- | -------- | -------- | -------- |
+| gamepadIndex | Integer | Yes | Joystick index. |
+| name | String | Yes | Button name: sholderLeft, sholderRight, axesUp, axesDown, axesLeft, axesRight, buttonBlue, buttonYellow, buttonRed, buttonGreen, start or select. |
+
+**Notice:** Only works when calibrated.
+
+### getButtonPressedByIndex(gamepadIndex, buttonIndex)
+
+Returns a boolean button state: `true` or `false`.
+
+| Parameter | Type | Required | Description |
+| -------- | -------- | -------- | -------- |
+| gamepadIndex | Integer | Yes | Joystick index. |
+| buttonIndex | Integer | Yes | Button index. |
+
+### getAxesValueByIndex(gamepadIndex, axesIndex)
+
+Returns a integer axis state: `-1`, `0`, `1`.
+
+| Parameter | Type | Required | Description |
+| -------- | -------- | -------- | -------- |
+| gamepadIndex | Integer | Yes | Joystick index. |
+| axesIndex | Integer | Yes | Axes index. |
+
+## Events
+
+Events return an object with the following properties:
+
+| Property | Type | Description |
+| -------- | -------- | -------- |
+| gamepadName | String | Joystick name. |
+| gamepadIndex | Integer | Joystick index. |
+| index | Integer | Button index. |
+| name | String | Button name: sholderLeft, sholderRight, axesUp, axesDown, axesLeft, axesRight, buttonBlue, buttonYellow, buttonRed, buttonGreen, start or select. Return empty "" if the joystick is not calibrated. |
+| pressed | Boolean | Button is pressed or not. |
+| type | String | Button type: axes or button. |
+| value | Integer | "axes" can return directions -1, 0 or 1, and buttons can return 0 or 1. |
+
+There are 4 types of events:
+
+### onButtonPressed
+
+Triggered when a button is pressed.
+```js
+joystick.onButtonPressed(function(eventObj){});
+```
+
+### onButtonReleased
+
+Triggered when a button is released.
+```js
+joystick.onButtonReleased(function(eventObj){});
+```
+
+### onAxesPressed
+
+Triggered when an axes is pressed.
+```js
+joystick.onAxesPressed(function(eventObj){});
+```
+
+### onAxesReleased
+
+Triggered when an axes is released.
+```js
+joystick.onAxesReleased(function(eventObj){});
+```