axis3d-inputs

Axis3D commands that provide state for user inputs.

Installation

$ npm install axis3d-inputs

Usage

const KeyboardInput = require('axis3d-inputs/keyboard')
const MouseInput = require('axis3d-inputs/keyboard')
const TouchInput = require('axis3d-inputs/keyboard')
const quat = require('gl-quat')
const vec3 = require('gl-vec3')
 
const keyboard = new KeyboardInput(ctx)
const mouse = new MouseInput(ctx)
const touch = new TouchInput(ctx)
 
const rotation = quat.identity([])
const position = [0, 0, 0]
 
frame(() => {
  keyboard(({keys}) => {
    if (keys.left) {
      vec3.add(position, position, [-1, 0, 0])
    } else if (keys.right) {
      vec3.add(position, position, [+1, 0, 0])
    }
 
    if (keys.up) {
      vec3.add(position, position, [0, 0, +1])
    } else if (keys.down) {
      vec3.add(position, position, [0, 0, -1])
    }
  })
 
  mouse(({mouse, wheel}) => {
    if (mouse.buttons > 0) {
      quat.rotateY(rotation, rotation, mouse.deltaX)
      quat.rotateX(rotation, rotation, mouse.deltaY)
    }
 
    if (wheel.deltaY) {
      vec3.add(position, position, [0, 0, 0.5*wheel.deltaY])
    }
  })
 
  touch(({touches}) => {
    if (touches) {
      switch (touches.length) {
        case 1:
          quat.rotateY(rotation, rotation, touches[0].deltaX)
          quat.rotateX(rotation, rotation, touches[0].deltaY)
          break;
 
        case 2: break;
        default:
      }
    }
  })
})

Supported Inputs

• Keyboard
• Mouse
• Touch

API

This module exposes constructors for commands compatible with Axis3D. Commands are just functions that accept arguments and a callback. The callback function exposes context variables associated with the command. Context variables can hold information about the current state of the input in use.

KeyboardInput(ctx)

The KeyboardInput command provides keyboard context variables that expose which keys are currently pressed (or not).

keyboard(({keys, keycodes}) => {
  if (keys.h) left()
  if (keys.l) right()
  if (keys.k) up()
  if (keys.j) down()
})

Context Variables

• keys - An object containing a map of key names and a boolean value indicating that the key is currently pressed
• keycodes - An object containing a map of key codes and a boolean value indicating that the key is currently pressed

MouseInput(ctx)

The MouseInput command provides mouse context variables that expose the current mouse state including the wheel and currently pressed buttons count. The current, delta, and previous [x, y] coordinates of the mouse cursor position and wheel are exposed.

mouse(({mouse, wheel}) => {
  quat.setAxisAngle(xRotation, [1, 0, 0], 0.5*mouse.deltaY)
  quat.setAxisAngle(yRotation, [0, 1, 0], 0.5*mouse.deltaX)
})
  fieldOfView += 0.5*wheel.deltaY

Context Variables

• mouse - The current mouse state
  • buttons - Number of mouse buttons currently pressed
  • currentX - The current x coordinate of the mouse cursor
  • currentY - The current y coordinate of the mouse cursor
  • deltaX - The differnence between the previous and current x coordinate of the mouse cursor
  • deltaY - The differnence between the previous and current y coordinate of the mouse cursor
  • prevX - The previous x coordinate of the mouse cursor
  • prevY - The previous y coordinate of the mouse cursor

TouchInput(ctx)

The TouchInput command provides touch context variables that expose the current touch state including the wheel and currently pressed buttons count. The current, delta, and previous [x, y] coordinates of the touch position and wheel are exposed.

touch(({touches, wheel}) => {
  if (1 == touches.length) {
    quat.setAxisAngle(xRotation, [1, 0, 0], 0.5*touches[0].deltaY)
    quat.setAxisAngle(yRotation, [0, 1, 0], 0.5*touches[0].deltaX)
  }
})

Context Variables

• touches - Currently active touches where touches[i] is:
  • currentX - The current x coordinate of the touch
  • currentY - The current y coordinate of the touch
  • offsetX - The current x coordinate offset of the touch position
  • offsetY - The current y coordinate offset of the touch position
  • startX - The start x coordinate offset of the touch
  • startY - The start y coordinate offset of the touch
  • deltaX - The differnence between the previous and current x coordinate of the touch position
  • deltaY - The differnence between the previous and current y coordinate of the touch position
  • prevX - The previous x coordinate of the touch
  • prevY - The previous y coordinate of the touch

License

MIT