Jose Cancel Jose Cancel - 1 month ago 25
C# Question

How do I correctly update my chart values? (In real time)

I recently encountered a tool called LiveChart and decided to test it out.

Unfortunately I've been having some problems figuring out how to update the chart values in real time. I'm pretty sure there's a clean and correct way of doing it, but I can't seam to find it.

I would like to be able to update the values through a

private void
or button.

In my code I'm testing it out with a ToolStripMenu.

[CODE]:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using LiveCharts;
using LiveCharts.WinForms;
using LiveCharts.Wpf;
using PokeShowdown_AccStats_T.Properties;
using LiveCharts.Defaults;

namespace PokeShowdown_AccStats_T
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

//int val1 = int.Parse(Settings.Default.Value1);

var value1 = new ObservableValue(3);
var value2 = new ObservableValue(7);
var value3 = new ObservableValue(10);
var value4 = new ObservableValue(2);

//value1.Value = 5;

cartesianChart1.Series.Add(new LineSeries
{
Values = new ChartValues<ObservableValue> { value1, value2, value3, value4 },
StrokeThickness = 4,
StrokeDashArray = new System.Windows.Media.DoubleCollection(20),
Stroke = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Color.FromRgb(107, 185, 69)),
Fill = System.Windows.Media.Brushes.Transparent,
LineSmoothness = 0,
PointGeometry = null
});



cartesianChart1.Background = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Color.FromRgb(34, 46, 49));

cartesianChart1.AxisX.Add(new Axis
{
IsMerged = true,
Separator = new Separator
{
StrokeThickness = 1,
StrokeDashArray = new System.Windows.Media.DoubleCollection(2),
Stroke = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Color.FromRgb(64, 79, 86))
}
});
cartesianChart1.AxisY.Add(new Axis
{
IsMerged = true,
Separator = new Separator
{
StrokeThickness = 1.5,
StrokeDashArray = new System.Windows.Media.DoubleCollection(4),
Stroke = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Color.FromRgb(64, 79, 86))
}
});
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void changeValue1ToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings.Default.Value1 = "10";
Settings.Default.Save();
this.Text = Settings.Default.Value1;

}

private void changeValue1To3ToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings.Default.Value1 = "3";
Settings.Default.Save();
this.Text = Settings.Default.Value1;

}
}
}

Answer

Live-Charts tries to keep it simple. The logic is to use a generic collection with the type you need to plot, and then as easy as adding/removing or updating any element in this collection then your chart will be updated.

To answer your question, you normally need to:

public partial class Form1 : Form
{
    private ObservableValue value1;

    public Form1()
    {
        InitializeComponent();

        //int val1 = int.Parse(Settings.Default.Value1);

        value1 = new ObservableValue(3);
        //...

        cartesianChart1.Series.Add(new LineSeries 
        {
            Values = new ChartValues<ObservableValue> { value1, ... },
        });
    }

    private void changeValue1ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        value1.Value = 10;
        Settings.Default.Value1 = "10";
        Settings.Default.Save();
        this.Text = Settings.Default.Value1;

    }
}

Then the library will handle animations and the update

enter image description here

Comments