util methods for calculating color brightness
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4823b267cc
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64
js/reveal.js
64
js/reveal.js
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@ -714,6 +714,10 @@
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if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
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if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
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if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
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if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
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if( data.backgroundColor ) {
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}
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container.appendChild( element );
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container.appendChild( element );
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return element;
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return element;
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@ -1065,6 +1069,63 @@
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}
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}
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/**
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* Measures the distance in pixels between point a and point b.
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*
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* @param {String} color The string representation of a color,
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* the following formats are supported:
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* - #000
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* - #000000
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* - rgb(0,0,0)
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*/
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function colorToRgb( color ) {
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var hex3 = color.match( /^#([0-9a-f]{3})$/i );
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if( hex3 && hex3[1] ) {
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hex3 = hex3[1];
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return {
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r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
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g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
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b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
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};
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}
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var hex6 = color.match( /^#([0-9a-f]{6})$/i );
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if( hex6 && hex6[1] ) {
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hex6 = hex6[1];
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return {
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r: parseInt( hex6.substr( 0, 2 ), 16 ),
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g: parseInt( hex6.substr( 2, 2 ), 16 ),
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b: parseInt( hex6.substr( 4, 2 ), 16 )
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};
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}
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var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
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if( rgb ) {
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return {
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r: rgb[1],
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g: rgb[2],
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b: rgb[3]
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};
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}
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return null;
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}
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/**
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* Calculates brightness on a scale of 0-255.
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*
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* @param color See colorStringToRgb for supported formats.
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*/
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function colorBrightness( color ) {
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if( typeof color === 'string' ) color = colorToRgb( color );
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return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
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}
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/**
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/**
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* Retrieves the height of the given element by looking
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* Retrieves the height of the given element by looking
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* at the position and height of its immediate children.
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* at the position and height of its immediate children.
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@ -4039,6 +4100,9 @@
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addEventListeners: addEventListeners,
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addEventListeners: addEventListeners,
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removeEventListeners: removeEventListeners,
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removeEventListeners: removeEventListeners,
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colorToRgb: colorToRgb,
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colorBrightness: colorBrightness,
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// Facility for persisting and restoring the presentation state
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// Facility for persisting and restoring the presentation state
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getState: getState,
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getState: getState,
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setState: setState,
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setState: setState,
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