/Source/OxyPlot/Manipulators/ZoomRectangleManipulator.cs

// --------------------------------------------------------------------------------------------------------------------

// <copyright file="ZoomRectangleManipulator.cs" company="OxyPlot">

//   The MIT License (MIT)

//

//   Copyright (c) 2012 Oystein Bjorke

//

//   Permission is hereby granted, free of charge, to any person obtaining a

//   copy of this software and associated documentation files (the

//   "Software"), to deal in the Software without restriction, including

//   without limitation the rights to use, copy, modify, merge, publish,

//   distribute, sublicense, and/or sell copies of the Software, and to

//   permit persons to whom the Software is furnished to do so, subject to

//   the following conditions:

//

//   The above copyright notice and this permission notice shall be included

//   in all copies or substantial portions of the Software.

//

//   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

//   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

//   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

//   IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

//   CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

//   TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

//   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// </copyright>

// <summary>

//   The zoom manipulator.

// </summary>

// --------------------------------------------------------------------------------------------------------------------

namespace OxyPlot

{

    using System;



    /// <summary>

    /// Provides a plot control manipulator for zoom by rectangle functionality.

    /// </summary>

    public class ZoomRectangleManipulator : ManipulatorBase

    {

        /// <summary>

        /// Initializes a new instance of the <see cref="ZoomRectangleManipulator"/> class.

        /// </summary>

        /// <param name="plotControl">

        /// The plot control.

        /// </param>

        public ZoomRectangleManipulator(IPlotControl plotControl)

            : base(plotControl)

        {

        }



        /// <summary>

        /// Gets or sets the zoom rectangle.

        /// </summary>

        private OxyRect ZoomRectangle { get; set; }



        /// <summary>

        /// Occurs when a manipulation is complete.

        /// </summary>

        /// <param name="e">

        /// The <see cref="OxyPlot.ManipulationEventArgs"/> instance containing the event data.

        /// </param>

        public override void Completed(ManipulationEventArgs e)

        {

            base.Completed(e);



            this.PlotControl.HideZoomRectangle();



            if (this.ZoomRectangle.Width > 10 && this.ZoomRectangle.Height > 10)

            {

                DataPoint p0 = this.InverseTransform(this.ZoomRectangle.Left, this.ZoomRectangle.Top);

                DataPoint p1 = this.InverseTransform(this.ZoomRectangle.Right, this.ZoomRectangle.Bottom);



                if (this.XAxis != null)

                {

                    this.PlotControl.Zoom(this.XAxis, p0.X, p1.X);

                }



                if (this.YAxis != null)

                {

                    this.PlotControl.Zoom(this.YAxis, p0.Y, p1.Y);

                }



                this.PlotControl.InvalidatePlot();

            }

        }



        /// <summary>

        /// Occurs when the input device changes position during a manipulation.

        /// </summary>

        /// <param name="e">

        /// The <see cref="OxyPlot.ManipulationEventArgs"/> instance containing the event data.

        /// </param>

        public override void Delta(ManipulationEventArgs e)

        {

            base.Delta(e);



            OxyRect plotArea = this.PlotControl.ActualModel.PlotArea;



            double x = Math.Min(this.StartPosition.X, e.CurrentPosition.X);

            double w = Math.Abs(this.StartPosition.X - e.CurrentPosition.X);

            double y = Math.Min(this.StartPosition.Y, e.CurrentPosition.Y);

            double h = Math.Abs(this.StartPosition.Y - e.CurrentPosition.Y);



            if (this.XAxis == null)

            {

                x = plotArea.Left;

                w = plotArea.Width;

            }



            if (this.YAxis == null)

            {

                y = plotArea.Top;

                h = plotArea.Height;

            }



            this.ZoomRectangle = new OxyRect(x, y, w, h);

            this.PlotControl.ShowZoomRectangle(this.ZoomRectangle);

        }



        /// <summary>

        /// Gets the cursor for the manipulation.

        /// </summary>

        /// <returns>

        /// The cursor.

        /// </returns>

        public override CursorType GetCursorType()

        {

            if (this.XAxis == null)

            {

                return CursorType.ZoomVertical;

            }



            if (this.YAxis == null)

            {

                return CursorType.ZoomHorizontal;

            }



            return CursorType.ZoomRectangle;

        }



        /// <summary>

        /// Occurs when an input device begins a manipulation on the plot.

        /// </summary>

        /// <param name="e">

        /// The <see cref="OxyPlot.ManipulationEventArgs"/> instance containing the event data.

        /// </param>

        public override void Started(ManipulationEventArgs e)

        {

            base.Started(e);

            this.ZoomRectangle = new OxyRect(this.StartPosition.X, this.StartPosition.Y, 0, 0);

            this.PlotControl.ShowZoomRectangle(this.ZoomRectangle);

        }



    }

}