var Stats = function () {
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var mode = 0;
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var container = document.createElement( 'div' );
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container.style.cssText = 'position:fixed;top:0;left:0;cursor:pointer;opacity:0.9;z-index:10000';
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container.addEventListener( 'click', function ( event ) {
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event.preventDefault();
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showPanel( ++ mode % container.children.length );
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}, false );
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//
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function addPanel( panel ) {
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container.appendChild( panel.dom );
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return panel;
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}
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function showPanel( id ) {
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for ( var i = 0; i < container.children.length; i ++ ) {
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container.children[ i ].style.display = i === id ? 'block' : 'none';
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}
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mode = id;
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}
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//
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var beginTime = ( performance || Date ).now(), prevTime = beginTime, frames = 0;
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var fpsPanel = addPanel( new Stats.Panel( 'FPS', '#0ff', '#002' ) );
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var msPanel = addPanel( new Stats.Panel( 'MS', '#0f0', '#020' ) );
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if ( self.performance && self.performance.memory ) {
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var memPanel = addPanel( new Stats.Panel( 'MB', '#f08', '#201' ) );
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}
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showPanel( 0 );
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return {
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REVISION: 16,
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dom: container,
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addPanel: addPanel,
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showPanel: showPanel,
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begin: function () {
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beginTime = ( performance || Date ).now();
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},
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end: function () {
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frames ++;
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var time = ( performance || Date ).now();
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msPanel.update( time - beginTime, 200 );
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if ( time >= prevTime + 1000 ) {
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fpsPanel.update( ( frames * 1000 ) / ( time - prevTime ), 100 );
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prevTime = time;
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frames = 0;
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if ( memPanel ) {
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var memory = performance.memory;
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memPanel.update( memory.usedJSHeapSize / 1048576, memory.jsHeapSizeLimit / 1048576 );
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}
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}
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return time;
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},
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update: function () {
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beginTime = this.end();
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},
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// Backwards Compatibility
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domElement: container,
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setMode: showPanel
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};
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};
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Stats.Panel = function ( name, fg, bg ) {
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var min = Infinity, max = 0, round = Math.round;
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var PR = round( window.devicePixelRatio || 1 );
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var WIDTH = 80 * PR, HEIGHT = 48 * PR,
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TEXT_X = 3 * PR, TEXT_Y = 2 * PR,
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GRAPH_X = 3 * PR, GRAPH_Y = 15 * PR,
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GRAPH_WIDTH = 74 * PR, GRAPH_HEIGHT = 30 * PR;
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var canvas = document.createElement( 'canvas' );
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canvas.width = WIDTH;
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canvas.height = HEIGHT;
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canvas.style.cssText = 'width:80px;height:48px';
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var context = canvas.getContext( '2d' );
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context.font = 'bold ' + ( 9 * PR ) + 'px Helvetica,Arial,sans-serif';
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context.textBaseline = 'top';
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context.fillStyle = bg;
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context.fillRect( 0, 0, WIDTH, HEIGHT );
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context.fillStyle = fg;
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context.fillText( name, TEXT_X, TEXT_Y );
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context.fillRect( GRAPH_X, GRAPH_Y, GRAPH_WIDTH, GRAPH_HEIGHT );
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context.fillStyle = bg;
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context.globalAlpha = 0.9;
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context.fillRect( GRAPH_X, GRAPH_Y, GRAPH_WIDTH, GRAPH_HEIGHT );
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return {
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dom: canvas,
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update: function ( value, maxValue ) {
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min = Math.min( min, value );
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max = Math.max( max, value );
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context.fillStyle = bg;
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context.globalAlpha = 1;
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context.fillRect( 0, 0, WIDTH, GRAPH_Y );
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context.fillStyle = fg;
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context.fillText( round( value ) + ' ' + name + ' (' + round( min ) + '-' + round( max ) + ')', TEXT_X, TEXT_Y );
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context.drawImage( canvas, GRAPH_X + PR, GRAPH_Y, GRAPH_WIDTH - PR, GRAPH_HEIGHT, GRAPH_X, GRAPH_Y, GRAPH_WIDTH - PR, GRAPH_HEIGHT );
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context.fillRect( GRAPH_X + GRAPH_WIDTH - PR, GRAPH_Y, PR, GRAPH_HEIGHT );
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context.fillStyle = bg;
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context.globalAlpha = 0.9;
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context.fillRect( GRAPH_X + GRAPH_WIDTH - PR, GRAPH_Y, PR, round( ( 1 - ( value / maxValue ) ) * GRAPH_HEIGHT ) );
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}
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};
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};
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export default Stats;
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