Разработка кода ИС Практическая работа №19

Практическое занятие № 19

Тема: Создание штрихкода в WPF

Цель работы: приобретение навыков работы в создании штрихкода в WPF.

Приобретаемые умения и навыки: умение создавать штрихкод в WPF.

Норма времени: 2 часа.

Оборудование: Компьютер с установленным программным обеспечением и подключенный к Internet.

Методические указания по выполнению практической работы

Чтобы создать штрихкод формата EAN-13 в WPF, нужно сначала объявить словари с шириной черных и белых штрихов. Это нужно, потому что от ширины штрихов зависит то, какая цифра закодирована. А так же объявить словарь с первой группой цифр в штрихкоде.

Dictionary dictA = new Dictionary(10);

Dictionary dictB = new Dictionary(10);

Dictionary dictC = new Dictionary(10);

Dictionary numGroup = new Dictionary(10);

Листинг 1 – Объявление словарей

Следующим этапом будет написание метода с заполнением словарей значениями.

public void FillDict()

{

dictA.Add(0, new List { 3, 2, 1, 1 });

dictA.Add(1, new List { 2, 2, 2, 1 });

dictA.Add(2, new List { 2, 1, 2, 2 });

dictA.Add(3, new List { 1, 4, 1, 1 });

dictA.Add(4, new List { 1, 1, 3, 2 });

dictA.Add(5, new List { 1, 2, 3, 1 });

dictA.Add(6, new List { 1, 1, 1, 4 });

dictA.Add(7, new List { 1, 3, 1, 2 });

dictA.Add(8, new List { 1, 2, 1, 3 });

dictA.Add(9, new List { 3, 1, 1, 2 });

dictB.Add(0, new List { 1, 1, 2, 3 });

dictB.Add(1, new List { 1, 2, 2, 2 });

dictB.Add(2, new List { 2, 2, 1, 2 });

dictB.Add(3, new List { 1, 1, 4, 1 });

dictB.Add(4, new List { 2, 3, 1, 1 });

dictB.Add(5, new List { 1, 3, 2, 1 });

dictB.Add(6, new List { 4, 1, 1, 1 });

dictB.Add(7, new List { 2, 1, 3, 1 });

dictB.Add(8, new List { 3, 1, 2, 1 });

dictB.Add(9, new List { 2, 1, 1, 3 });

dictC.Add(0, new List { 3, 2, 1, 1 });

dictC.Add(1, new List { 2, 2, 2, 1 });

dictC.Add(2, new List { 2, 1, 2, 2 });

dictC.Add(3, new List { 1, 4, 1, 1 });

dictC.Add(4, new List { 1, 1, 3, 2 });

dictC.Add(5, new List { 1, 2, 3, 1 });

dictC.Add(6, new List { 1, 1, 1, 4 });

dictC.Add(7, new List { 1, 3, 1, 2 });

dictC.Add(8, new List { 1, 2, 1, 3 });

dictC.Add(9, new List { 3, 1, 1, 2 });

numGroup.Add(0, new List { "A", "A", "A", "A", "A", "A"});

numGroup.Add(1, new List { "A", "A", "B", "A", "B", "B" });

numGroup.Add(2, new List { "A", "A", "B", "B", "A", "B" });

numGroup.Add(3, new List { "A", "A", "B", "B", "B", "A" });

numGroup.Add(4, new List { "A", "B", "A", "A", "B", "B" });

numGroup.Add(5, new List { "A", "B", "B", "A", "A", "B" });

numGroup.Add(6, new List { "A", "B", "B", "B", "A", "A" });

numGroup.Add(7, new List { "A", "B", "A", "B", "A", "B" });

numGroup.Add(8, new List { "A", "B", "A", "B", "B", "A" });

numGroup.Add(9, new List { "A", "B", "B", "A", "B", "A" });

}

Листинг 2 – Заполнение словарей

Теперь напишем метод для заполнения штрихкода числами по умолчанию.

public void Load(string num)

{

barcodeCan.Children.RemoveRange(0, barcodeCan.Children.Count-1);

char[] nums = num.Replace(" ", "").Replace(",", "").ToArray();

List numGroupNum = numGroup[Convert.ToInt32(nums[0])-48];

Rectangle rect = new Rectangle()

{

Height = 222.0,

Width = 4.0,

Margin = new Thickness(30, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rect2 = new Rectangle()

{

Height = 222.0,

Width = 2.0,

Margin = new Thickness(33, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rect1_2 = new Rectangle()

{

Height = 222.0,

Width = 4.0,

Margin = new Thickness(36, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Label lb1 = new Label()

{

Content = nums[0],

FontSize = 24,

FontWeight = FontWeights.Bold,

Margin = new Thickness(8, 207, 0, 0),

};

barcodeCan.Children.Add(lb1);

barcodeCan.Children.Add(rect);

barcodeCan.Children.Add(rect2);

barcodeCan.Children.Add(rect1_2);

Rectangle localRec = rect1_2;

for (int i = 0; i

{

Rectangle rec1 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][0] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][0],

Margin = new Thickness(localRec.Margin.Left + localRec.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rec2 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][1] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][1],

Margin = new Thickness(rec1.Margin.Left + rec1.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rec3 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][2] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][2],

Margin = new Thickness(rec2.Margin.Left + rec2.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rec4 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][3] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][3],

Margin = new Thickness(rec3.Margin.Left + rec3.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Label lbl = new Label()

{

Content = nums[i+1],

FontSize = 24,

FontWeight = FontWeights.Bold,

Margin = new Thickness(rec1.Margin.Left, 207, 0, 0),

};

localRec = rec4;

barcodeCan.Children.Add(lbl);

barcodeCan.Children.Add(rec1);

barcodeCan.Children.Add(rec2);

barcodeCan.Children.Add(rec3);

barcodeCan.Children.Add(rec4);

}

Rectangle rect3 = copyRec(localRec);

rect3.Margin = new Thickness(rect3.Margin.Left + 6.0, 10, 0, 0);

rect3.Width = 4.0;

rect3.Height = 222.0;

Rectangle rect4 = copyRec(rect3);

rect4.Margin = new Thickness(rect4.Margin.Left + 3.0, 10, 0, 0);

rect4.Width = 4.0;

barcodeCan.Children.Add(rect3);

barcodeCan.Children.Add(rect4);

localRec = copyRec(rect4);

for (int i = 7; i

{

Rectangle rec1 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][0],

Margin = new Thickness(localRec.Margin.Left + localRec.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rec2 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][1],

Margin = new Thickness(rec1.Margin.Left + rec1.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rec3 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][2],

Margin = new Thickness(rec2.Margin.Left + rec2.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rec4 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][3],

Margin = new Thickness(rec3.Margin.Left + rec3.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Label lbl = new Label()

{

Content = nums[i],

FontSize = 24,

FontWeight = FontWeights.Bold,

Margin = new Thickness(rec1.Margin.Left, 207, 0, 0),

};

localRec = rec4;

barcodeCan.Children.Add(lbl);

barcodeCan.Children.Add(rec1);

barcodeCan.Children.Add(rec2);

barcodeCan.Children.Add(rec3);

barcodeCan.Children.Add(rec4);

}

Rectangle rect5 = copyRec(localRec);

rect5.Width = 4.0;

rect5.Height = 222.0;

Rectangle rect6 = copyRec(rect5);

rect6.Margin = new Thickness(rect6.Margin.Left + 3.0, 10, 0, 0);

rect6.Width = 4.0;

barcodeCan.Children.Add(rect5);

barcodeCan.Children.Add(rect6);

}

Листинг 3 – Заполнение штрихкода по умолчанию

Также нам нужно написать метод для копирования значений другого прямоугольника, который является одним их штрихов.

private Rectangle copyRec(Rectangle rec)

{

return new Rectangle() {

Height = Math.Floor(rec.Height),

Width = Math.Floor(rec.Width),

Margin = new Thickness(rec.Margin.Left + rec.Width, 10,0,0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

}

Листинг 4 – Метод для копирования значений

Код программы целиком представлен ниже

public partial class MainWindow : Window

{

Dictionary dictA = new Dictionary(10);

Dictionary dictB = new Dictionary(10);

Dictionary dictC = new Dictionary(10);

Dictionary numGroup = new Dictionary(10);

barcodeDBEntities db = new barcodeDBEntities();

public MainWindow()

{

InitializeComponent();

FillDict();

Load("0000000000000");

}

private Rectangle copyRec(Rectangle rec)

{

return new Rectangle() {

Height = Math.Floor(rec.Height),

Width = Math.Floor(rec.Width),

Margin = new Thickness(rec.Margin.Left + rec.Width, 10,0,0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

}

public void FillDict()

{

dictA.Add(0, new List { 3, 2, 1, 1 });

dictA.Add(1, new List { 2, 2, 2, 1 });

dictA.Add(2, new List { 2, 1, 2, 2 });

dictA.Add(3, new List { 1, 4, 1, 1 });

dictA.Add(4, new List { 1, 1, 3, 2 });

dictA.Add(5, new List { 1, 2, 3, 1 });

dictA.Add(6, new List { 1, 1, 1, 4 });

dictA.Add(7, new List { 1, 3, 1, 2 });

dictA.Add(8, new List { 1, 2, 1, 3 });

dictA.Add(9, new List { 3, 1, 1, 2 });

dictB.Add(0, new List { 1, 1, 2, 3 });

dictB.Add(1, new List { 1, 2, 2, 2 });

dictB.Add(2, new List { 2, 2, 1, 2 });

dictB.Add(3, new List { 1, 1, 4, 1 });

dictB.Add(4, new List { 2, 3, 1, 1 });

dictB.Add(5, new List { 1, 3, 2, 1 });

dictB.Add(6, new List { 4, 1, 1, 1 });

dictB.Add(7, new List { 2, 1, 3, 1 });

dictB.Add(8, new List { 3, 1, 2, 1 });

dictB.Add(9, new List { 2, 1, 1, 3 });

dictC.Add(0, new List { 3, 2, 1, 1 });

dictC.Add(1, new List { 2, 2, 2, 1 });

dictC.Add(2, new List { 2, 1, 2, 2 });

dictC.Add(3, new List { 1, 4, 1, 1 });

dictC.Add(4, new List { 1, 1, 3, 2 });

dictC.Add(5, new List { 1, 2, 3, 1 });

dictC.Add(6, new List { 1, 1, 1, 4 });

dictC.Add(7, new List { 1, 3, 1, 2 });

dictC.Add(8, new List { 1, 2, 1, 3 });

dictC.Add(9, new List { 3, 1, 1, 2 });

numGroup.Add(0, new List { "A", "A", "A", "A", "A", "A"});

numGroup.Add(1, new List { "A", "A", "B", "A", "B", "B" });

numGroup.Add(2, new List { "A", "A", "B", "B", "A", "B" });

numGroup.Add(3, new List { "A", "A", "B", "B", "B", "A" });

numGroup.Add(4, new List { "A", "B", "A", "A", "B", "B" });

numGroup.Add(5, new List { "A", "B", "B", "A", "A", "B" });

numGroup.Add(6, new List { "A", "B", "B", "B", "A", "A" });

numGroup.Add(7, new List { "A", "B", "A", "B", "A", "B" });

numGroup.Add(8, new List { "A", "B", "A", "B", "B", "A" });

numGroup.Add(9, new List { "A", "B", "B", "A", "B", "A" });

}

public void Load(string num)

{

barcodeCan.Children.RemoveRange(0, barcodeCan.Children.Count-1);

char[] nums = num.Replace(" ", "").Replace(",", "").ToArray();

List numGroupNum = numGroup[Convert.ToInt32(nums[0])-48];

Rectangle rect = new Rectangle()

{

Height = 222.0,

Width = 4.0,

Margin = new Thickness(30, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rect2 = new Rectangle()

{

Height = 222.0,

Width = 2.0,

Margin = new Thickness(33, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rect1_2 = new Rectangle()

{

Height = 222.0,

Width = 4.0,

Margin = new Thickness(36, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Label lb1 = new Label()

{

Content = nums[0],

FontSize = 24,

FontWeight = FontWeights.Bold,

Margin = new Thickness(8, 207, 0, 0),

};

barcodeCan.Children.Add(lb1);

barcodeCan.Children.Add(rect);

barcodeCan.Children.Add(rect2);

barcodeCan.Children.Add(rect1_2);

Rectangle localRec = rect1_2;

for (int i = 0; i

{

Rectangle rec1 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][0] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][0],

Margin = new Thickness(localRec.Margin.Left + localRec.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rec2 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][1] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][1],

Margin = new Thickness(rec1.Margin.Left + rec1.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rec3 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][2] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][2],

Margin = new Thickness(rec2.Margin.Left + rec2.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rec4 = new Rectangle()

{

Height = 207.0,

Width = (numGroupNum[i] == "A") ? 3.0 * dictA[Convert.ToInt32(nums[i + 1]) - 48][3] : 3.0 * dictB[Convert.ToInt32(nums[i + 1]) - 48][3],

Margin = new Thickness(rec3.Margin.Left + rec3.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Label lbl = new Label()

{

Content = nums[i+1],

FontSize = 24,

FontWeight = FontWeights.Bold,

Margin = new Thickness(rec1.Margin.Left, 207, 0, 0),

};

localRec = rec4;

barcodeCan.Children.Add(lbl);

barcodeCan.Children.Add(rec1);

barcodeCan.Children.Add(rec2);

barcodeCan.Children.Add(rec3);

barcodeCan.Children.Add(rec4);

}

Rectangle rect3 = copyRec(localRec);

rect3.Margin = new Thickness(rect3.Margin.Left + 6.0, 10, 0, 0);

rect3.Width = 4.0;

rect3.Height = 222.0;

Rectangle rect4 = copyRec(rect3);

rect4.Margin = new Thickness(rect4.Margin.Left + 3.0, 10, 0, 0);

rect4.Width = 4.0;

barcodeCan.Children.Add(rect3);

barcodeCan.Children.Add(rect4);

localRec = copyRec(rect4);

for (int i = 7; i

{

Rectangle rec1 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][0],

Margin = new Thickness(localRec.Margin.Left + localRec.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rec2 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][1],

Margin = new Thickness(rec1.Margin.Left + rec1.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Rectangle rec3 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][2],

Margin = new Thickness(rec2.Margin.Left + rec2.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.Black,

SnapsToDevicePixels = true

};

Rectangle rec4 = new Rectangle()

{

Height = 207.0,

Width = 3.0 * dictC[Convert.ToInt32(nums[i]) - 48][3],

Margin = new Thickness(rec3.Margin.Left + rec3.Width, 10, 0, 0),

Fill = System.Windows.Media.Brushes.White,

SnapsToDevicePixels = true

};

Label lbl = new Label()

{

Content = nums[i],

FontSize = 24,

FontWeight = FontWeights.Bold,

Margin = new Thickness(rec1.Margin.Left, 207, 0, 0),

};

localRec = rec4;

barcodeCan.Children.Add(lbl);

barcodeCan.Children.Add(rec1);

barcodeCan.Children.Add(rec2);

barcodeCan.Children.Add(rec3);

barcodeCan.Children.Add(rec4);

}

Rectangle rect5 = copyRec(localRec);

rect5.Width = 4.0;

rect5.Height = 222.0;

Rectangle rect6 = copyRec(rect5);

rect6.Margin = new Thickness(rect6.Margin.Left + 3.0, 10, 0, 0);

rect6.Width = 4.0;

barcodeCan.Children.Add(rect5);

barcodeCan.Children.Add(rect6);

}

private void TxtBox_TextChanged(object sender, TextChangedEventArgs e)

{

try

{

Load(txtBox.Text);

}

catch

{

}

}

Листинг 5 – Код программы целиком

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:local="clr-namespace:BarcodeWPF"

mc:Ignorable="d"

Title="EAN-13" Height="500" Width="400" WindowStartupLocation="CenterScreen" ResizeMode="NoResize"

Листинг 6 – Код разметки

Рис. 1 – Программа

Контрольные вопросы:

1. Что такое штрихкод?

2. Для чего используются штрихкоды?