snek.js

snek.js

// Full snake game implementation

let x, y, xd, yd, z
 
feature.on('keys', e => {
  if (e.keys.up && yd >= 0) {
    yd = -1
    xd = 0
  } else if (e.keys.left && xd >= 0) {
    yd = 0
    xd = -1
  } else if (e.keys.right && xd <= 0) {
    yd = 0
    xd = 1
  } else if (e.keys.down && yd <= 0) {
    yd = 1
    xd = 0
  }
})

feature.on('start', e => {
  reset()
})

function reset () {
  x = 32
  y = 32
  xd = 1
  yd = 0

  for (z = 0 ; z < feature.screenWidth * feature.screenHeight * 3; z++) {
    feature.screen[z] = 0
  }
}

function died () {
  reset()
}

feature.on('frame', e => {
  // Draw random background noise
  for (z = 0 ; z < 100; z++) {
    let i = Math.floor(Math.random() * 64 * 64) * 3
    let r = Math.random() * 128
    feature.screen[i + 0] = r
  }

  // Set green + blue
  x += xd
  y += yd

  // Hit the edge of the screen
  if (x >= feature.screenWidth || x <= 0 || y >= feature.screenHeight || y <= 0) {
    died()
  }

  let i = (y * 64 + x) * 3

  // Hit my tail
  if (feature.screen[i + 1] > 0) {
    died()
  }

  feature.screen[i + 1] = 255
  feature.screen[i + 2] = 128

})