util methods for calculating color brightness
This commit is contained in:
parent
4823b267cc
commit
8a50a46665
64
js/reveal.js
64
js/reveal.js
|
@ -714,6 +714,10 @@
|
|||
if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
|
||||
if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
|
||||
|
||||
if( data.backgroundColor ) {
|
||||
|
||||
}
|
||||
|
||||
container.appendChild( element );
|
||||
|
||||
return element;
|
||||
|
@ -1065,6 +1069,63 @@
|
|||
|
||||
}
|
||||
|
||||
/**
|
||||
* Measures the distance in pixels between point a and point b.
|
||||
*
|
||||
* @param {String} color The string representation of a color,
|
||||
* the following formats are supported:
|
||||
* - #000
|
||||
* - #000000
|
||||
* - rgb(0,0,0)
|
||||
*/
|
||||
function colorToRgb( color ) {
|
||||
|
||||
var hex3 = color.match( /^#([0-9a-f]{3})$/i );
|
||||
if( hex3 && hex3[1] ) {
|
||||
hex3 = hex3[1];
|
||||
return {
|
||||
r: parseInt( hex3.charAt( 0 ), 16 ) * 0x11,
|
||||
g: parseInt( hex3.charAt( 1 ), 16 ) * 0x11,
|
||||
b: parseInt( hex3.charAt( 2 ), 16 ) * 0x11
|
||||
};
|
||||
}
|
||||
|
||||
var hex6 = color.match( /^#([0-9a-f]{6})$/i );
|
||||
if( hex6 && hex6[1] ) {
|
||||
hex6 = hex6[1];
|
||||
return {
|
||||
r: parseInt( hex6.substr( 0, 2 ), 16 ),
|
||||
g: parseInt( hex6.substr( 2, 2 ), 16 ),
|
||||
b: parseInt( hex6.substr( 4, 2 ), 16 )
|
||||
};
|
||||
}
|
||||
|
||||
var rgb = color.match( /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i );
|
||||
if( rgb ) {
|
||||
return {
|
||||
r: rgb[1],
|
||||
g: rgb[2],
|
||||
b: rgb[3]
|
||||
};
|
||||
}
|
||||
|
||||
return null;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates brightness on a scale of 0-255.
|
||||
*
|
||||
* @param color See colorStringToRgb for supported formats.
|
||||
*/
|
||||
function colorBrightness( color ) {
|
||||
|
||||
if( typeof color === 'string' ) color = colorToRgb( color );
|
||||
|
||||
return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Retrieves the height of the given element by looking
|
||||
* at the position and height of its immediate children.
|
||||
|
@ -4039,6 +4100,9 @@
|
|||
addEventListeners: addEventListeners,
|
||||
removeEventListeners: removeEventListeners,
|
||||
|
||||
colorToRgb: colorToRgb,
|
||||
colorBrightness: colorBrightness,
|
||||
|
||||
// Facility for persisting and restoring the presentation state
|
||||
getState: getState,
|
||||
setState: setState,
|
||||
|
|
Loading…
Reference in New Issue