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//
// Trend.cs
//
// Author:
// Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// Copyright (c) 2016 jp
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using System.Collections.Generic;
using System.Xml.Serialization;
using System.ComponentModel;
namespace Crow
{
public class Trend : GraphicObject
{
#region private fields
double minValue, maxValue, lowThreshold, highThreshold;
Fill lowThresholdFill, highThresholdFill;
int nbValues;
List<double> values = new List<double>();
#endregion
public virtual void AddValue(double _value)
{
values.Add (_value);
while (values.Count > nbValues)
values.RemoveAt (0);
RegisterForRedraw ();
}
public Trend ()
{
}
[XmlIgnore]public virtual int NewValue {
set {
AddValue (value);
}
}
[XmlAttributeAttribute()][DefaultValue(100)]
public virtual int NbValues {
get { return nbValues; }
set {
if (nbValues == value)
return;
nbValues = value;
NotifyValueChanged ("NbValues", minValue);
RegisterForRedraw ();
}
}
[XmlAttributeAttribute()][DefaultValue(0.0)]
public virtual double Minimum {
get { return minValue; }
set {
if (minValue == value)
return;
minValue = value;
NotifyValueChanged ("Minimum", minValue);
RegisterForRedraw ();
}
}
[XmlAttributeAttribute()][DefaultValue(100.0)]
public virtual double Maximum
{
get { return maxValue; }
set {
if (maxValue == value)
return;
maxValue = value;
NotifyValueChanged ("Maximum", maxValue);
RegisterForRedraw ();
}
}
[XmlAttributeAttribute()][DefaultValue(20.0)]
public virtual double LowThreshold {
get { return lowThreshold; }
set {
if (lowThreshold == value)
return;
lowThreshold = value;
NotifyValueChanged ("LowThreshold", lowThreshold);
RegisterForGraphicUpdate ();
}
}
[XmlAttributeAttribute()][DefaultValue(80.0)]
public virtual double HighThreshold {
get { return highThreshold; }
set {
if (highThreshold == value)
return;
highThreshold = value;
NotifyValueChanged ("HighThreshold", highThreshold);
RegisterForGraphicUpdate ();
}
}
[XmlAttributeAttribute()][DefaultValue("DarkRed")]
public virtual Fill LowThresholdFill {
get { return lowThresholdFill; }
set {
if (lowThresholdFill == value)
return;
lowThresholdFill = value;
NotifyValueChanged ("LowThresholdFill", lowThresholdFill);
RegisterForRedraw ();
}
}
[XmlAttributeAttribute()][DefaultValue("DarkGreen")]
public virtual Fill HighThresholdFill {
get { return highThresholdFill; }
set {
if (highThresholdFill == value)
return;
highThresholdFill = value;
NotifyValueChanged ("HighThresholdFill", highThresholdFill);
RegisterForRedraw ();
}
}
protected override void onDraw (Cairo.Context gr)
{
base.onDraw (gr);
if (values.Count == 0)
return;
Rectangle r = ClientRectangle;
int i = values.Count -1;
double ptrX = (double)r.Right;
double scaleY = (double)r.Height / (Maximum - Minimum);
double stepX = (double)r.Width / (double)(nbValues-1);
gr.LineWidth = 1.0;
gr.SetDash (new double[]{ 1.0 },0.0);
LowThresholdFill.SetAsSource (gr);
gr.MoveTo (r.Left, r.Bottom - LowThreshold * scaleY);
gr.LineTo (r.Right, r.Bottom - LowThreshold * scaleY);
// gr.Rectangle (r.Left, r.Bottom - LowThreshold * scaleY, r.Width, LowThreshold * scaleY);
gr.Stroke();
HighThresholdFill.SetAsSource (gr);
gr.MoveTo (r.Left, (Maximum - HighThreshold) * scaleY);
gr.LineTo (r.Right, (Maximum - HighThreshold) * scaleY);
// gr.Rectangle (r.Left, r.Top, r.Width, (Maximum - HighThreshold) * scaleY);
gr.Stroke();
gr.MoveTo (ptrX, values [i] * scaleY);
Foreground.SetAsSource (gr);
gr.SetDash (new double[]{ }, 0.0);
while (i >= 0) {
gr.LineTo (ptrX, r.Bottom - values [i] * scaleY);
ptrX -= stepX;
i--;
}
gr.Stroke ();
}
}
}
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