tbf/GraphLib/DataSource.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.ComponentModel;
using System.Drawing;

/* Copyright (c) 2008-2014 DI Zimmermann Stephan (stefan.zimmermann@tele2.at)
 *   
 * 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.
 */

namespace GraphLib
{
    public class DataSource  
    {
        public delegate String OnDrawXAxisLabelEvent(DataSource src, int idx);
        public delegate String OnDrawYAxisLabelEvent(DataSource src, float value);

        public OnDrawXAxisLabelEvent OnRenderXAxisLabel = null;
        public OnDrawYAxisLabelEvent OnRenderYAxisLabel = null;

        private PointF[] samples = null;
        private int length = 0;

        private String name = String.Empty;
        private int downSample = 1;
        private Color color = Color.Black;

        public float VisibleDataRange_X = 0;
        public float DY = 0;      
        public float YD0 = -200;
        public float YD1 = 200;
        public float Cur_YD0 = -200;
        public float Cur_YD1 = 200;

        public float grid_distance_y = 200;       // grid distance in units ( draw a horizontal line every 200 units )       

        public float off_Y = 0;
        public float grid_off_y = 0;
        
        public bool yFlip = true;      
        
        public bool Active = true;
                        
        public float XAutoScaleOffset = 100;
        
        public float CurGraphHeight = 1.0f;
        
        public float CurGraphWidth = 1.0f;

		private bool autoScaleY = false;
		private bool autoScaleX = false;


        public bool AutoScaleY
        {
            get { return autoScaleY; }
            set { autoScaleY = value; }
        }

        public bool AutoScaleX
        {
            get { return autoScaleX; }
            set { autoScaleX = value; }
        }

        public PointF[] Samples
        {
            get  { return samples; }
            set 
            {
                samples = value;
                length = samples.Length;
            }
        }

        public float  XMin
        {
            get
            {
                float x_min = float.MaxValue;
				if (samples != null && samples.Length > 0)
                {
                    foreach (PointF p in samples) if (p.X < x_min)  x_min=p.X;
                }
                return x_min;
            }
        }

        public float XMax
        {
            get
            {
                float x_max = float.MinValue;
				if (samples != null && samples.Length > 0)
                {
                    foreach (PointF p in samples) if (p.X > x_max) x_max = p.X;
                }
                return x_max;
            }
        }

        public float YMin
        {
            get
            {
                float y_min = float.MaxValue;
				if (samples != null && samples.Length > 0)
                {
                    foreach (PointF p in samples) if (p.Y < y_min) y_min = p.Y;
                }
                return y_min;
            }
        }

        public float YMax
        {
            get
            {
                float y_max = float.MinValue;
                if (samples.Length > 0)
                {
                    foreach (PointF p in samples) if (p.Y > y_max) y_max = p.Y;
                }
                return y_max;
            }
        }

        public void SetDisplayRangeY(float y_start, float y_end)
        {            
            YD0 = y_start;
            YD1 = y_end;
        }
         
        public void SetGridDistanceY(float grid_dist_y_units)
        {
            grid_distance_y = grid_dist_y_units;
        }

        public void SetGridOriginY(float off_y)
        {           
            grid_off_y = off_y;
        }


		/// <summary>
		/// Load Samples from a file. Returns loaded points count.
		/// </summary>
		/// <param name="pathName">File pathname</param>
		/// <returns>Loaded points count</returns>
		public int LoadSamples(string pathName, out float yMin, out float yMax)
		{
			yMin = float.MaxValue;
			yMax = float.MinValue;
			try
			{
				Int64 size = new FileInfo(pathName).Length;
				if ((size % 8) != 0) return 0;
				int samplesCount = (int)(size / 8L) - 1;
				if (samplesCount <= 0) return 0;

				PointF[] newSamples = new PointF[samplesCount];
				using (BinaryReader reader = new BinaryReader(File.Open(pathName, FileMode.Open)))
				{
					for (int i = 0; i < samplesCount; i++)
					{
						newSamples[i].X = reader.ReadSingle();
						newSamples[i].Y = reader.ReadSingle();
					}
					yMin = reader.ReadSingle();
					yMax = reader.ReadSingle();
				}

				Samples = newSamples;
				return samplesCount;
			}
			catch (Exception)
			{
				return 0;
			}
		}


        [Category("Properties")] // Take this out, and you will soon have problems with serialization;
        [DefaultValue(typeof(string), "")]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public String Name
        {
            get { return name; }
            set { name = value; }
        }

        [Category("Properties")] // Take this out, and you will soon have problems with serialization;
        [DefaultValue(typeof(Color), "")]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public Color GraphColor
        {
            get { return color; }
            set { color = value; }
        }

        [Category("Properties")] // Take this out, and you will soon have problems with serialization;
        [DefaultValue(typeof(int), "0")]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public int Length
        {
            get { return length; }
            set 
            { 
                length = value;
                if (length != 0)
                {
                    samples = new PointF[length];
                }
                else
                {
                    // length is 0
                    if (samples != null)
                    {
                        samples = null;
                    }
                }
            }
        }
        
        [Category("Properties")] // Take this out, and you will soon have problems with serialization;
        [DefaultValue(typeof(int), "1")]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public int Downsampling
        {
            get { return downSample; }
            set { downSample = value; }
        }
    } 
}