Тема: ctx.fillStyle
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Старый 10.03.2017, 12:03
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Регистрация: 27.05.2010
Сообщений: 33,124

MininDM,
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
div#mp3_player{ width:600px;background:#000; margin:50px auto; }
div#mp3_player > div > audio{  width:500px; background:#000; float:left;  }
div#mp3_player > canvas{ width:600px; height:30px;background:#002D3C;  float:left; }
</style>
<script>
function timeColor() {
  var now = new Date();
  var hours = now.getHours();
  var color = "#0000FF";
  if(hours >= 18 || hours < 9)
    color = "#FFFF00"

  return color;
}

// Create a new instance of an audio object and adjust some of its properties
var audio = new Audio();
audio.src = 'Nightcore.mp3';
audio.controls = false;
audio.loop = true;
audio.autoplay = true;
// Establish all variables that your Analyser will use
var canvas, ctx, source, context, analyser, fbc_array, bars, bar_x, bar_width, bar_height;
// Initialize the MP3 player after the page loads all of its HTML into the window
window.addEventListener("load", initMp3Player, false);
function initMp3Player(){
  document.getElementById('audio_box').appendChild(audio);
  context = new AudioContext(); // AudioContext object instance
  analyser = context.createAnalyser(); // AnalyserNode method
  canvas = document.getElementById('analyser_render');
  ctx = canvas.getContext('2d');
  // Re-route audio playback into the processing graph of the AudioContext
  source = context.createMediaElementSource(audio);
  source.connect(analyser);
  analyser.connect(context.destination);
  frameLooper();
}
// frameLooper() animates any style of graphics you wish to the audio frequency
// Looping at the default frame rate that the browser provides(approx. 60 FPS)
function frameLooper(){
  window.requestAnimationFrame(frameLooper);
  fbc_array = new Uint8Array(analyser.frequencyBinCount);
  analyser.getByteFrequencyData(fbc_array);
  ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear the canvas

  ctx.fillStyle = timeColor(); // Color of the bars


  bars = 100;
  for (var i = 0; i < bars; i++) {
    bar_x = i * 3;
    bar_width = 2;
    bar_height = -(fbc_array[i] / 2);
    //  fillRect( x, y, width, height ) // Explanation of the parameters below
    ctx.fillRect(bar_x, canvas.height, bar_width, bar_height);
  }
}
</script>
</head>
<body>
<div id="mp3_player">
  <div id="audio_box"></div>
  <canvas id="analyser_render"></canvas>
</div>
</body>
</html>
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