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+Sencha Documentation Project/**
+ * @class Ext.chart.Mask
+ *
+ * Defines a mask for a chart's series.
+ * The 'chart' member must be set prior to rendering.
+ *
+ * A Mask can be used to select a certain region in a chart.
+ * When enabled, the `select` event will be triggered when a
+ * region is selected by the mask, allowing the user to perform
+ * other tasks like zooming on that region, etc.
+ *
+ * In order to use the mask one has to set the Chart `mask` option to
+ * `true`, `vertical` or `horizontal`. Then a possible configuration for the
+ * listener could be:
+ *
+ items: {
+ xtype: 'chart',
+ animate: true,
+ store: store1,
+ mask: 'horizontal',
+ listeners: {
+ select: {
+ fn: function(me, selection) {
+ me.setZoom(selection);
+ me.mask.hide();
+ }
+ }
+ },
+
+ * In this example we zoom the chart to that particular region. You can also get
+ * a handle to a mask instance from the chart object. The `chart.mask` element is a
+ * `Ext.Panel`.
+ *
+ * @constructor
+ */
+Ext.define('Ext.chart.Mask', {
+ constructor: function(config) {
+ var me = this;
+
+ me.addEvents('select');
+
+ if (config) {
+ Ext.apply(me, config);
+ }
+ if (me.mask) {
+ me.on('afterrender', function() {
+ //create a mask layer component
+ var comp = Ext.create('Ext.chart.MaskLayer', {
+ renderTo: me.el
+ });
+ comp.el.on({
+ 'mousemove': function(e) {
+ me.onMouseMove(e);
+ },
+ 'mouseup': function(e) {
+ me.resized(e);
+ }
+ });
+ //create a resize handler for the component
+ var resizeHandler = Ext.create('Ext.resizer.Resizer', {
+ el: comp.el,
+ handles: 'all',
+ pinned: true
+ });
+ resizeHandler.on({
+ 'resize': function(e) {
+ me.resized(e);
+ }
+ });
+ comp.initDraggable();
+ me.maskType = me.mask;
+ me.mask = comp;
+ me.maskSprite = me.surface.add({
+ type: 'path',
+ path: ['M', 0, 0],
+ zIndex: 1001,
+ opacity: 0.7,
+ hidden: true,
+ stroke: '#444'
+ });
+ }, me, { single: true });
+ }
+ },
+
+ resized: function(e) {
+ var me = this,
+ bbox = me.bbox || me.chartBBox,
+ x = bbox.x,
+ y = bbox.y,
+ width = bbox.width,
+ height = bbox.height,
+ box = me.mask.getBox(true),
+ max = Math.max,
+ min = Math.min,
+ staticX = box.x - x,
+ staticY = box.y - y;
+
+ staticX = max(staticX, x);
+ staticY = max(staticY, y);
+ staticX = min(staticX, width);
+ staticY = min(staticY, height);
+ box.x = staticX;
+ box.y = staticY;
+ me.fireEvent('select', me, box);
+ },
+
+ onMouseUp: function(e) {
+ var me = this,
+ bbox = me.bbox || me.chartBBox,
+ sel = me.maskSelection;
+ me.maskMouseDown = false;
+ me.mouseDown = false;
+ if (me.mouseMoved) {
+ me.onMouseMove(e);
+ me.mouseMoved = false;
+ me.fireEvent('select', me, {
+ x: sel.x - bbox.x,
+ y: sel.y - bbox.y,
+ width: sel.width,
+ height: sel.height
+ });
+ }
+ },
+
+ onMouseDown: function(e) {
+ var me = this;
+ me.mouseDown = true;
+ me.mouseMoved = false;
+ me.maskMouseDown = {
+ x: e.getPageX() - me.el.getX(),
+ y: e.getPageY() - me.el.getY()
+ };
+ },
+
+ onMouseMove: function(e) {
+ var me = this,
+ mask = me.maskType,
+ bbox = me.bbox || me.chartBBox,
+ x = bbox.x,
+ y = bbox.y,
+ math = Math,
+ floor = math.floor,
+ abs = math.abs,
+ min = math.min,
+ max = math.max,
+ height = floor(y + bbox.height),
+ width = floor(x + bbox.width),
+ posX = e.getPageX(),
+ posY = e.getPageY(),
+ staticX = posX - me.el.getX(),
+ staticY = posY - me.el.getY(),
+ maskMouseDown = me.maskMouseDown,
+ path;
+
+ me.mouseMoved = me.mouseDown;
+ staticX = max(staticX, x);
+ staticY = max(staticY, y);
+ staticX = min(staticX, width);
+ staticY = min(staticY, height);
+ if (maskMouseDown && me.mouseDown) {
+ if (mask == 'horizontal') {
+ staticY = y;
+ maskMouseDown.y = height;
+ posY = me.el.getY() + bbox.height + me.insetPadding;
+ }
+ else if (mask == 'vertical') {
+ staticX = x;
+ maskMouseDown.x = width;
+ }
+ width = maskMouseDown.x - staticX;
+ height = maskMouseDown.y - staticY;
+ path = ['M', staticX, staticY, 'l', width, 0, 0, height, -width, 0, 'z'];
+ me.maskSelection = {
+ x: width > 0 ? staticX : staticX + width,
+ y: height > 0 ? staticY : staticY + height,
+ width: abs(width),
+ height: abs(height)
+ };
+ me.mask.updateBox({
+ x: posX - abs(width),
+ y: posY - abs(height),
+ width: abs(width),
+ height: abs(height)
+ });
+ me.mask.show();
+ me.maskSprite.setAttributes({
+ hidden: true
+ }, true);
+ }
+ else {
+ if (mask == 'horizontal') {
+ path = ['M', staticX, y, 'L', staticX, height];
+ }
+ else if (mask == 'vertical') {
+ path = ['M', x, staticY, 'L', width, staticY];
+ }
+ else {
+ path = ['M', staticX, y, 'L', staticX, height, 'M', x, staticY, 'L', width, staticY];
+ }
+ me.maskSprite.setAttributes({
+ path: path,
+ fill: me.maskMouseDown ? me.maskSprite.stroke : false,
+ 'stroke-width': mask === true ? 1 : 3,
+ hidden: false
+ }, true);
+ }
+ },
+
+ onMouseLeave: function(e) {
+ var me = this;
+ me.mouseMoved = false;
+ me.mouseDown = false;
+ me.maskMouseDown = false;
+ me.mask.hide();
+ me.maskSprite.hide(true);
+ }
+});
+
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