windows-forms-charts

Main window layout:

1. Opening file

Selecting file window:

If file was not selected or file was not .txt type, appropriate messagebox would be displayed. Window thats opens up automaticly shows only .txt files but user can manually change the filter to all types of files. This works like that because .Filter property is set to "txt files (*.txt)|*.txt|All files (*.*)|*.*".

private void button1_Click(object sender, EventArgs e)
        {
            Stream myStream = null;
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.InitialDirectory = "/.";
            openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            if (openFileDialog1.ShowDialog() == DialogResult.OK && openFileDialog1.FileName.Contains(".txt"))
            {
                try
                {
                    if ((myStream = openFileDialog1.OpenFile()) != null)
                    {
                        using (myStream)
                        {
                            button1.AccessibleRole = AccessibleRole.None;
                            button3.AccessibleRole = AccessibleRole.Default;
                            label1.Text = "Wczytano pliki " + openFileDialog1.FileName.Substring(openFileDialog1.FileName.LastIndexOf(@"\") + 1);
                            label1.ForeColor = Color.Green;
                            button2.Enabled = true;
                            button3.Enabled = true;
                            string file = File.ReadAllText(openFileDialog1.FileName);

                            string[] readData = file.Split(';').ToArray();
                            double number;

                            if (!double.TryParse(readData[0], out number))
                                title = readData[0];

                            for (int i = 0; i < readData.Length - 1; i++)
                                if (double.TryParse(readData[i], out number))
                                    samples.Add(number);
                            calculateValues();
                            myStream.Close();
                        }
                    }
                }
                catch (Exception ex)
                {

                    MessageBox.Show("Błąd: Nie można było wczytać pliku.\nOriginal error: " + ex.Message, "Błąd!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
            else if (openFileDialog1.FileName == "")
            {
                MessageBox.Show("Nie wybrano pliku!", "Uwaga!", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            } 
            else
            {
                MessageBox.Show("Błąd: Wybrano zły typ pliku!", "Błąd!", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

MessageBox shown if .jpg file was selected instead of .txt:

and if no file was selected:

2. Calculating and displaying values

Part of code responsible for calculating each value and put it into right textbox. Variables sum & pom are class attributes.

public void calculateValues()
        {
            quantity = samples.Count;

            for (int i = 0; i < samples.Count; i++)
            {
                sum += samples[i];
            }
            average = Math.Round(sum / samples.Count, accuracy);
            samples.Sort();
            maxValue = Math.Round(samples[samples.Count - 1], accuracy);
            minValue = Math.Round(samples[0], accuracy);

            for(int j = 0; j < samples.Count; j++)
            {
                pom += Math.Pow(samples[j] - average, 2);
            }
            variance = Math.Round(pom / samples.Count, accuracy);

            textBoxQuantity.Text = quantity.ToString();
            textBoxAverage.Text = average.ToString();
            textBoxvVariance.Text = variance.ToString();
            textBoxMaxValue.Text = maxValue.ToString();
            textBoxMinValues.Text = minValue.ToString();
        }

Property ReadOnly is set to true for all of the textboxes. That means values can't be modified by user.

3. Chart

Chart opens up in new window after "Wyświetl wykres" button was clicked.

Chart window appearance:

Creating new object called wykres (class Wykres inherits from class Form) it means that new window is created. Object wykres is new window in which chart is shown.

private void button2_MouseClick(object sender, MouseEventArgs e)
        {
            Wykres wykres = new Wykres(samples, title);
            wykres.Show(); //opening window
        }

Declaring variables in class Wykres

public static Legend legend;
public static Series s1, s2;
List<double> samples = new List<double>();
public static string title;
public static ChartArea chartArea;

Drawing series is done by simple for loop that iterates through each sample in array and create series in result. That code is executed in Wyres_Load method.

for (int x = 0; x < samples.Count; x++)
        s1.Points.AddXY(x + 1, samples[x]);
for (int x2 = 1; x2 < samples.Count; x2++)
        s2.Points.AddXY(x2, samples[x2]-samples[x2-1]);

Changing type of chart in Series s1. The user can choose between Columne type and Line type.

private void ChangeChartTypeS1_Click(object sender, EventArgs e)
        {
            if (s1.ChartType == SeriesChartType.Column)
            {
                s1.ChartType = SeriesChartType.Line;
            }
            else if (s1.ChartType == SeriesChartType.Line)
            {
                s1.ChartType = SeriesChartType.Column;
            }
        }

Hiding side menu if the window get too small. Menu in right side automatically hides if height of the window is smaller than 553px. All of the options can still be access via MenuStrip located on top.

This method is checking if specific values were exceeded during resizing window:

private void Form2_Resize(object sender, System.EventArgs e)
        {
            if (this.Height < 553)
                menuStrip2.Visible = false;
            else
                menuStrip2.Visible = true;
        }

Saving chart to the .jpg file

SaveFileDialog appearance:

If chart window is in focus and Ctrl+S shortcut will be executed or Save as... button will be clicked, new SaveFileDialog window shows up in which .jpeg file containing chart can be saved. Part of code responsible for that:

private void zapiszJakoToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog1;
            saveFileDialog1 = new SaveFileDialog();
            saveFileDialog1.Filter = "JPeg Image|*.jpg";

            DialogResult dr = saveFileDialog1.ShowDialog();
            if (dr == DialogResult.OK)
            {
                string filename = saveFileDialog1.FileName;
                chart1.SaveImage(filename, ChartImageFormat.Jpeg);
            }
        }

4. Saving results to the `.txt` file

The window automaticlly displays path where it was closed last time.

Code is written in ToolStripMenuItem method due to shortcut Ctrl+S could be used. Saving is manage by SaveFileDialog class. ShowDialog() method opens up new window in which user can choose the path where file will be saved. Files can be saved only in .txt format because .Filter property is set so.

private void zapiszJakoToolStripMenuItem_Click(object sender, EventArgs e)
        {
            using (var sfd = new SaveFileDialog())
            {
                sfd.Filter = "txt files|*.txt";

                if (sfd.ShowDialog() == DialogResult.OK)
                {
                    string filename = sfd.FileName;
                    string dataToSave = $"Ilość pomiarów: {quantity}\nŚrednia arytmetyczna: {average}\nWariancja: {variance}\nWartość maksymalna: {maxValue}\nWartość minimalna: {minValue}";
                    File.WriteAllText(filename, dataToSave);
                }
            }
        }

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