/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

Commercial Usage
Licensees holding valid commercial licenses may use this file in accordance with the Commercial
Software License Agreement provided with the Software or, alternatively, in accordance with the
terms contained in a written agreement between you and Sencha.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-09-18 17:18:59 (940c324ac822b840618a3a8b2b4b873f83a1a9b1)
*/
/**
 * 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`.
 * 
 */
Ext.define('Ext.chart.Mask', {
    requires: [
        'Ext.chart.MaskLayer'
    ],
    
    /**
     * @cfg {Boolean/String} mask
     * Enables selecting a region on chart. True to enable any selection,
     * 'horizontal' or 'vertical' to restrict the selection to X or Y axis.
     *
     * The mask in itself will do nothing but fire 'select' event.
     * See {@link Ext.chart.Mask} for example.
     */

    /**
     * Creates new Mask.
     * @param {Object} [config] Config object.
     */
    constructor: function(config) {
        var me = this;

        me.addEvents('select');

        if (config) {
            Ext.apply(me, config);
        }
        if (me.enableMask) {
            me.on('afterrender', function() {
                //create a mask layer component
                var comp = new Ext.chart.MaskLayer({
                    renderTo: me.el,
                    hidden: true
                });
                comp.el.on({
                    'mousemove': function(e) {
                        me.onMouseMove(e);
                    },
                    'mouseup': function(e) {
                        me.onMouseUp(e);
                    }
                });
                comp.initDraggable();
                me.maskType = me.mask;
                me.mask = comp;
                me.maskSprite = me.surface.add({
                    type: 'path',
                    path: ['M', 0, 0],
                    zIndex: 1001,
                    opacity: 0.6,
                    hidden: true,
                    stroke: '#00f',
                    cursor: 'crosshair'
                });
            }, me, { single: true });
        }
    },

    onMouseUp: function(e) {
        var me = this,
            bbox = me.bbox || me.chartBBox,
            sel;
        me.maskMouseDown = false;
        me.mouseDown = false;
        if (me.mouseMoved) {
            me.handleMouseEvent(e);
            me.mouseMoved = false;
            sel = me.maskSelection;
            me.fireEvent('select', me, {
                x: sel.x - bbox.x,
                y: sel.y - bbox.y,
                width: sel.width,
                height: sel.height
            });
        }
    },

    onMouseDown: function(e) {
        this.handleMouseEvent(e);
    },

    onMouseMove: function(e) {
        this.handleMouseEvent(e);
    },

    handleMouseEvent: 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),
            staticX = e.getPageX() - me.el.getX(),
            staticY = e.getPageY() - me.el.getY(),
            maskMouseDown = me.maskMouseDown,
            path;

        staticX = max(staticX, x);
        staticY = max(staticY, y);
        staticX = min(staticX, width);
        staticY = min(staticY, height);

        if (e.type === 'mousedown') {
            // remember the cursor location
            me.mouseDown = true;
            me.mouseMoved = false;
            me.maskMouseDown = {
                x: staticX,
                y: staticY
            };
        }
        else {
            // mousedown or mouseup:
            // track the cursor to display the selection
            me.mouseMoved = me.mouseDown;
            if (maskMouseDown && me.mouseDown) {
                if (mask == 'horizontal') {
                    staticY = y;
                    maskMouseDown.y = height;
                }
                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) + me.el.getX(),
                    y: (height > 0 ? staticY : staticY + height) + me.el.getY(),
                    width: abs(width),
                    height: abs(height)
                };
                me.mask.updateBox(me.maskSelection);
                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,
                    'stroke-width': mask === true ? 1 : 1,
                    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);
    }
});
    
