osu-wayback/static/components/colorize.js
2018-01-12 23:16:10 +01:00

275 lines
8.2 KiB
JavaScript

/*!
* # Semantic UI 2.0.0 - Colorize
* http://github.com/semantic-org/semantic-ui/
*
*
* Copyright 2015 Contributors
* Released under the MIT license
* http://opensource.org/licenses/MIT
*
*/
;(function ( $, window, document, undefined ) {
"use strict";
$.fn.colorize = function(parameters) {
var
settings = ( $.isPlainObject(parameters) )
? $.extend(true, {}, $.fn.colorize.settings, parameters)
: $.extend({}, $.fn.colorize.settings),
// hoist arguments
moduleArguments = arguments || false
;
$(this)
.each(function(instanceIndex) {
var
$module = $(this),
mainCanvas = $('<canvas />')[0],
imageCanvas = $('<canvas />')[0],
overlayCanvas = $('<canvas />')[0],
backgroundImage = new Image(),
// defs
mainContext,
imageContext,
overlayContext,
image,
imageName,
width,
height,
// shortcuts
colors = settings.colors,
paths = settings.paths,
namespace = settings.namespace,
error = settings.error,
// boilerplate
instance = $module.data('module-' + namespace),
module
;
module = {
checkPreconditions: function() {
module.debug('Checking pre-conditions');
if( !$.isPlainObject(colors) || $.isEmptyObject(colors) ) {
module.error(error.undefinedColors);
return false;
}
return true;
},
async: function(callback) {
if(settings.async) {
setTimeout(callback, 0);
}
else {
callback();
}
},
getMetadata: function() {
module.debug('Grabbing metadata');
image = $module.data('image') || settings.image || undefined;
imageName = $module.data('name') || settings.name || instanceIndex;
width = settings.width || $module.width();
height = settings.height || $module.height();
if(width === 0 || height === 0) {
module.error(error.undefinedSize);
}
},
initialize: function() {
module.debug('Initializing with colors', colors);
if( module.checkPreconditions() ) {
module.async(function() {
module.getMetadata();
module.canvas.create();
module.draw.image(function() {
module.draw.colors();
module.canvas.merge();
});
$module
.data('module-' + namespace, module)
;
});
}
},
redraw: function() {
module.debug('Redrawing image');
module.async(function() {
module.canvas.clear();
module.draw.colors();
module.canvas.merge();
});
},
change: {
color: function(colorName, color) {
module.debug('Changing color', colorName);
if(colors[colorName] === undefined) {
module.error(error.missingColor);
return false;
}
colors[colorName] = color;
module.redraw();
}
},
canvas: {
create: function() {
module.debug('Creating canvases');
mainCanvas.width = width;
mainCanvas.height = height;
imageCanvas.width = width;
imageCanvas.height = height;
overlayCanvas.width = width;
overlayCanvas.height = height;
mainContext = mainCanvas.getContext('2d');
imageContext = imageCanvas.getContext('2d');
overlayContext = overlayCanvas.getContext('2d');
$module
.append( mainCanvas )
;
mainContext = $module.children('canvas')[0].getContext('2d');
},
clear: function(context) {
module.debug('Clearing canvas');
overlayContext.fillStyle = '#FFFFFF';
overlayContext.fillRect(0, 0, width, height);
},
merge: function() {
if( !$.isFunction(mainContext.blendOnto) ) {
module.error(error.missingPlugin);
return;
}
mainContext.putImageData( imageContext.getImageData(0, 0, width, height), 0, 0);
overlayContext.blendOnto(mainContext, 'multiply');
}
},
draw: {
image: function(callback) {
module.debug('Drawing image');
callback = callback || function(){};
if(image) {
backgroundImage.src = image;
backgroundImage.onload = function() {
imageContext.drawImage(backgroundImage, 0, 0);
callback();
};
}
else {
module.error(error.noImage);
callback();
}
},
colors: function() {
module.debug('Drawing color overlays', colors);
$.each(colors, function(colorName, color) {
settings.onDraw(overlayContext, imageName, colorName, color);
});
}
},
debug: function(message, variableName) {
if(settings.debug) {
if(variableName !== undefined) {
console.info(settings.name + ': ' + message, variableName);
}
else {
console.info(settings.name + ': ' + message);
}
}
},
error: function(errorMessage) {
console.warn(settings.name + ': ' + errorMessage);
},
invoke: function(methodName, context, methodArguments) {
var
method
;
methodArguments = methodArguments || Array.prototype.slice.call( arguments, 2 );
if(typeof methodName == 'string' && instance !== undefined) {
methodName = methodName.split('.');
$.each(methodName, function(index, name) {
if( $.isPlainObject( instance[name] ) ) {
instance = instance[name];
return true;
}
else if( $.isFunction( instance[name] ) ) {
method = instance[name];
return true;
}
module.error(settings.error.method);
return false;
});
}
return ( $.isFunction( method ) )
? method.apply(context, methodArguments)
: false
;
}
};
if(instance !== undefined && moduleArguments) {
// simpler than invoke realizing to invoke itself (and losing scope due prototype.call()
if(moduleArguments[0] == 'invoke') {
moduleArguments = Array.prototype.slice.call( moduleArguments, 1 );
}
return module.invoke(moduleArguments[0], this, Array.prototype.slice.call( moduleArguments, 1 ) );
}
// initializing
module.initialize();
})
;
return this;
};
$.fn.colorize.settings = {
name : 'Image Colorizer',
debug : true,
namespace : 'colorize',
onDraw : function(overlayContext, imageName, colorName, color) {},
// whether to block execution while updating canvas
async : true,
// object containing names and default values of color regions
colors : {},
metadata: {
image : 'image',
name : 'name'
},
error: {
noImage : 'No tracing image specified',
undefinedColors : 'No default colors specified.',
missingColor : 'Attempted to change color that does not exist',
missingPlugin : 'Blend onto plug-in must be included',
undefinedHeight : 'The width or height of image canvas could not be automatically determined. Please specify a height.'
}
};
})( jQuery, window , document );