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<!DOCTYPE html>
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<title>JSDoc: Source: display/Flicker.js</title>
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<h1 class="page-title">Source: display/Flicker.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>//------------------------------------------------------------------------------
// Constructor scope
//------------------------------------------------------------------------------
/**
* Creates a new Flicker object.
*
* @constructor
* @package
*
* @param {rune.display.DisplayObject} obj The display object to which the subsystem is connected.
*
* @class
* @classdesc
*
* The Flicker class is a subsystem that applies a flicker effect to display
* objects.
*/
rune.display.Flicker = function(obj) {
//--------------------------------------------------------------------------
// Private properties
//--------------------------------------------------------------------------
/**
* Whether the flicker effect is active (true) or not (false).
*
* @type {boolean}
* @private
*/
this.m_active = false;
/**
* The display object to which the flicker effect is to be applied.
*
* @type {rune.display.DisplayObject}
* @private
*/
this.m_displayObject = obj;
/**
* Duration of the effect.
*
* @type {number}
* @private
*/
this.m_duration = 0;
/**
* Flicker frequency.
*
* @type {number}
* @private
*/
this.m_frequency = 0;
/**
* Used to calculate the elapsed time for flicker frequency.
*
* @type {number}
* @private
*/
this.m_frequencyTicker = 0;
/**
* Callback method for when the flicker effect has reached its end.
*
* @type {rune.util.Executable}
* @private
*/
this.m_onComplete = null;
/**
* Whether the flicker effect is in a visible (true) or invisible (false)
* state.
*
* @type {boolean}
* @private
*/
this.m_visible = true;
};
//------------------------------------------------------------------------------
// Public getter and setter methods
//------------------------------------------------------------------------------
/**
* Whether the flicker effect is active (true) or not (false).
*
* @member {boolean} active
* @memberof rune.display.Flicker
* @instance
* @readonly
*/
Object.defineProperty(rune.display.Flicker.prototype, "active", {
/**
* @this rune.display.Flicker
* @ignore
*/
get : function() {
return this.m_active;
}
});
/**
* Whether the flicker effect is in a visible (true) or invisible (false) state.
* A display object can be visible but made invisible due to the flicker
* effect. Use this property together with the display object's visible
* property to check whether the object is rendered or not.
*
* @member {boolean} visible
* @memberof rune.display.Flicker
* @instance
* @readonly
*/
Object.defineProperty(rune.display.Flicker.prototype, "visible", {
/**
* @this rune.display.Flicker
* @ignore
*/
get : function() {
return this.m_visible;
}
});
//------------------------------------------------------------------------------
// Public methods (API)
//------------------------------------------------------------------------------
/**
* Starts the flicker effect with a predetermined intensity and duration. The
* effect can be terminated prematurely via the stop method.
*
* @param {number} [duration=3000] Duration in milliseconds.
* @param {number} [frequency=64] Intensity; a low frequency is high intensity and vice versa.
* @param {Function} [onComplete] Callback method.
* @param {Object} [scope] Scope of callback method.
*
* @returns {undefined}
*/
rune.display.Flicker.prototype.start = function(duration, frequency, onComplete, scope) {
this.m_active = true;
this.m_duration = duration || 500;
this.m_frequency = frequency || 60;
this.m_onComplete = new rune.util.Executable(onComplete, scope);
this.m_visible = false;
};
/**
* Stops ongoing flicker effect.
*
* @param {boolean} [exec=false] Whether the callback method should be executed as a consequence of stopping the flicker effect.
*
* @returns {undefined}
*/
rune.display.Flicker.prototype.stop = function(exec) {
this.m_active = false;
this.m_duration = 0;
this.m_frequency = 0;
this.m_visible = true;
if (this.m_onComplete != null && exec === true) {
this.m_onComplete.execute();
this.m_onComplete.dispose();
this.m_onComplete = null;
}
};
//------------------------------------------------------------------------------
// Internal prototype methods (ENGINE)
//------------------------------------------------------------------------------
/**
* Free up memory allocated by the instance.
*
* @returns {undefined}
* @package
* @ignore
*/
rune.display.Flicker.prototype.dispose = function() {
this.m_displayObject = null;
this.m_onComplete = null;
};
/**
* Updates the flicker effect.
*
* @param {number} step Current time step.
*
* @returns {undefined}
* @package
* @ignore
*/
rune.display.Flicker.prototype.update = function(step) {
if (this.m_active == true) {
if (this.m_duration > 0) {
this.m_duration -= step;
this.m_frequencyTicker += step;
if (this.m_frequencyTicker > this.m_frequency) {
this.m_frequencyTicker = 0;
this.m_visible = !this.m_visible;
if (this.m_displayObject['parent'] != null) {
this.m_displayObject['parent'].breakCache();
}
}
} else {
this.m_active = false;
this.m_visible = true;
this.m_displayObject['parent'].breakCache();
if (this.m_onComplete != null) {
this.m_onComplete.execute();
this.m_onComplete.dispose();
this.m_onComplete = null;
}
}
}
};</code></pre>
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