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File: ia\charts\layers\CountLayer.js

  1. /** 
  2.  * The base class for count bar layers.
  3.  *
  4.  * @author J Clare
  5.  * @class ia.CountLayer
  6.  * @extends ia.BarLayer
  7.  * @constructor
  8.  */
  9. ia.CountLayer = function()
  10. {
  11. 	ia.CountLayer.baseConstructor.call(this);
  12.  
  13. 	this.isLegendComponent = true;
  14. };
  15. ia.extend(ia.BarLayer, ia.CountLayer);
  16.  
  17. /**
  18.  * Specifies a thematic for the pie layer.
  19.  *
  20.  * @property thematic
  21.  * @type ia.Thematic
  22.  */
  23. ia.CountLayer.prototype.thematic;
  24.  
  25. /**
  26.  * Indicates this is a legend component.
  27.  *
  28.  * @property isLegendComponent
  29.  * @type Boolean
  30.  * @default true
  31.  */
  32. ia.CountLayer.prototype.isLegendComponent;
  33.  
  34. /**
  35.  * Updates the data.
  36.  *
  37.  * @method update
  38.  */
  39. ia.CountLayer.prototype.update = function() 
  40. {
  41. 	// Check if the data has changed
  42. 	if (this.map && this.dataChanged)
  43. 	{
  44. 		// Get the data.
  45. 		var data = this.getData()
  46.  
  47. 		// Clear the items.
  48. 		this.itemArray = [];
  49. 		this.clearItems();
  50. 		
  51. 		this.minValue = Infinity;
  52. 		this.maxValue = -Infinity;
  53. 		
  54. 		var classes = this.thematic.getClasses();
  55. 		for (var i = 0; i < classes.length; i++) 
  56. 		{
  57. 			var legendClass = classes[i];
  58.  
  59. 			// Create a new chart item.
  60. 			var chartItem = {};
  61. 			chartItem.id = legendClass.index;
  62. 			chartItem.legendClass = legendClass;
  63. 			chartItem.color = legendClass.color;
  64. 			chartItem.value = legendClass.items.length;
  65. 			chartItem.state = ia.ItemLayer.UNSELECTED;
  66. 			if (this.selectionIds.indexOf(chartItem.id) !== -1 ) chartItem.state = ia.ItemLayer.SELECTED;
  67. 			chartItem.parent = this;
  68. 			chartItem.layer = this;
  69. 			chartItem.label = legendClass.getLabel() + " : " + chartItem.value;
  70. 			
  71. 			chartItem.rect = new ia.Rectangle();
  72. 			chartItem.hitArea = new ia.Rectangle();
  73.  
  74. 			this.items[chartItem.id] = chartItem;
  75. 			this.itemArray.push(chartItem);
  76.  
  77. 			// Get the min and max bar values for the layer.
  78. 			this.minValue = Math.min(this.minValue, chartItem.value);
  79. 			this.maxValue = Math.max(this.maxValue, chartItem.value);
  80. 		}
  81. 		
  82. 		// Sort items if in sort direction.
  83. 		if (this.sortDirection !== undefined)
  84. 		{
  85. 			var dir;
  86. 			if (this.sortDirection === "ascending") dir = 1
  87. 			else dir = -1;
  88. 			
  89. 			this.itemArray.sort(function(a, b)
  90. 			{
  91. 				if (a.value < b.value) return -dir;
  92. 				if (a.value > b.value) return dir;
  93. 				return 0; 
  94. 			});
  95. 		}
  96. 		this.dataChanged = false;
  97. 	}
  98. };
  99.  
  100. /** 
  101.  * Displays the tip for the passed item
  102.  * 
  103.  * @method showTip
  104.  * @param {Object} item The map item.	 
  105.  * @param {ia.ItemEvent} event An <code>ia.ItemEvent</code>.
  106.  */
  107. ia.CountLayer.prototype.showTip = function(item, event)
  108. {
  109. 	this.map.datatip.text(item.label);
  110.  
  111. 	// Position above the bar.
  112. 	var px,py;
  113. 	
  114. 	if (ia.IS_TOUCH_DEVICE)
  115. 	{
  116. 		px = event.x - (this.map.datatip.getWidth() / 2);
  117. 		py = event.y - (this.map.datatip.getHeight() + 30);
  118. 	}
  119. 	else
  120. 	{
  121. 		if (this.map.orientation === "vertical")
  122. 		{
  123. 			px = (item.rect.x + (item.rect.width / 2)) -  (this.map.datatip.getWidth() / 2);
  124.  
  125. 			if (item.value < 0)
  126. 				py = item.rect.y + item.rect.height + 5;
  127. 			else
  128. 				py = item.rect.y - this.map.datatip.getHeight() - 5;
  129. 		}
  130. 		else
  131. 		{
  132. 			if (item.value < 0)
  133. 				px = item.rect.x - (this.map.datatip.getWidth() + 5);
  134. 			else
  135. 				px = (item.rect.x + item.rect.width) + 5;
  136.  
  137. 			py = (item.rect.y + (item.rect.height / 2)) -  (this.map.datatip.getHeight() / 2);
  138. 		}
  139. 	}
  140. 	this.map.datatip.position(px, py);
  141. 	this.map.datatip.show();
  142. };
  143.