      1 /**
      2  * Hilo
      3  * Copyright 2015 alibaba.com
      4  * Licensed under the MIT License
      5  */
      6
      7 /**
      8  * @class Renderer Renderer is the base class of renderer.
      9  * @param {Object} properties The properties to create a renderer, contains all writeable props of this class.
     10  * @module hilo/renderer/Renderer
     11  * @requires hilo/core/Class
     12  * @requires hilo/util/util
     13  * @property {Object} canvas The canvas of renderer. It can be a dom element, such as a div element, or a canvas element. readonly.
     14  * @property {Object} stage The stage of renderer, readonly.
     15  * @property {String} renderType The render type of renderer, readonly.
     16  */
     17 var Renderer = Class.create(/** @lends Renderer.prototype */{
     18     constructor: function(properties){
     19         properties = properties || {};
     20         util.copy(this, properties, true);
     21     },
     22
     23     renderType:null,
     24     canvas: null,
     25     stage: null,
     26     blendMode:'source-over',
     27
     28     /**
     29      * Prepare for draw visual object. The subclass need to implement it.
     30      * @param {View} target The visual target to draw.
     31      */
     32     startDraw: function(target){ },
     33
     34     /**
     35      * Draw the visual object. The subclass need to implement it.
     36      * @param {View} target The visual target to draw.
     37      */
     38     draw: function(target){ },
     39
     40     /**
     41      * The handling method after draw the visual object. The subclass need to implement it.
     42      * @param {View} target The visual target to draw.
     43      */
     44     endDraw: function(target){ },
     45
     46     /**
     47      * Transfrom the visual object. The subclass need to implement it.
     48      */
     49     transform: function(){ },
     50
     51     /**
     52      * Hide the visual object. The subclass need to implement it.
     53      */
     54     hide: function(){ },
     55
     56     /**
     57      * Remove the visual object from canvas. Notice that it dosen't remove the object from stage. The subclass need to implement it.
     58      * @param {View} target The visual target to remove.
     59      */
     60     remove: function(target){ },
     61
     62     /**
     63      * Clear the given region of canvas. The subclass need to implement it.
     64      * @param {Number} x The position on the x axis of the given region.
     65      * @param {Number} y The position on the y axis of the given region.
     66      * @param {Number} width The width of the given region.
     67      * @param {Number} height The height of the given region.
     68      */
     69     clear: function(x, y, width, height){ },
     70
     71     /**
     72      * Resize the renderer's canvas.
     73      * @param {Number} width The width of renderer's canvas.
     74      * @param {Number} height The height of the renderer's canvas.
     75      */
     76     resize: function(width, height){ }
     77
     78 });