天天向上

以下為PAPAYA電腦教室的投影片教學，有興趣的人可以去訂閱學習。目前列出幾個還蠻厲害的特效功能，剩下等之後有機會再去研究，學完幾個招式就感覺功力大增。
如何設計一個簡單且質感指數破表的時間軸？
如何製作一個讓老闆跪著看的沉浸式簡報？

Labeled Faces in the WildLabeled Faces in the Wild dataset, converted to fuel
FDDB: Face Detection Data Set and Benchmark

C# call a c++ method, which is called GetSourceImage(…)The following is the way how we get the bitmap data by copying srcBmpData to dstBmpdata, and showing them on a pictureBox.The copy sequence is just the same as OpenCV BGR, it looks as though we create a Format32bppArgb image. ,

 1: this.Invoke((MethodInvoker)delegate

 2: {

 3: int width, height, channel, step;

 4: unsafe

 5: {

 6: byte* srcBmpData = cVideo.GetSourceImage(&width, &height, &channel, &step);

 7: Result_lbl.Text = $"{width},{height},{channel},{step}";

 8: Bitmap bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

 9: var data = bmp.LockBits(new Rectangle(0, 0, width, height),

 10: System.Drawing.Imaging.ImageLockMode.WriteOnly,

 11: System.Drawing.Imaging.PixelFormat.Format32bppRgb);

 12: byte* dstBmpData = (byte*)data.Scan0.ToPointer();

 13: int hei = height;

 14: int wid = width;

 15: int stepsize = step;

 16: 

 17:  

 18: for (int y = 0; y < height; y++)

 19: {

 20: for (int x = 0; x < width; x++)

 21: {

 22: dstBmpData[y * width * 4 + 4 * x] = srcBmpData[y * step + channel * x];

 23: dstBmpData[y * width * 4 + 4 * x + 1] = srcBmpData[y * step + channel * x + 1];

 24: dstBmpData[y * width * 4 + 4 * x + 2] = srcBmpData[y * step + channel * x + 2];

 25: }

 26: }

 27: bmp.UnlockBits(data);

 28: pictureBox1.Image = bmp;

 29: }

 30: });

以下根據 DKTD-WinFormThreading 文章節錄重點
1.自己建立thread優點: 精確管理thread生命週期缺點: 執行緒數目過多時
，CPU會耗費太多的資源處理Context Switching

最常使用的快捷鍵

複製：Command + C

貼上：Command + V

剪下：Command + X

擷取螢幕/錄影：「Command+Shift+5」

全螢幕截圖：「Command + shift + 3」

自定地區螢幕截圖：「Command + shift + 4」

 

MainWindow.xaml

 1: <Window x:Class="WpfDispatcherApp.MainWindow"

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

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

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

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

 6: xmlns:local="clr-namespace:WpfDispatcherApp"

 7: mc:Ignorable="d"

 8: Title="MainWindow" Height="137" Width="554">

 9: <UniformGrid Rows="3" Columns="2">

 10: <Label Content="Input a number:" Height="28" HorizontalAlignment="Center" Name="label1" VerticalAlignment="Center" />

 11: <TextBox Height="23" HorizontalAlignment="Center" Name="textBox1" VerticalAlignment="Center" Width="100" Text="1000000000"/>

 12:  

 13: <Label Content="Result:" Height="28" HorizontalAlignment="Center" Name="label2" VerticalAlignment="Center" />

 14: <TextBox Height="23" HorizontalAlignment="Center" Name="textBox2" VerticalAlignment="Center" Width="100"/>

 15: <Button Content="synchronization" Height="23" HorizontalAlignment="Center" Name="button1" VerticalAlignment="Center" Width="100" Click="button1_Click" />

 16: <Button Content="asynchronization" Height="23" HorizontalAlignment="Center" Name="button2" VerticalAlignment="Center" Width="100" Click="button2_Click" />

 17: </UniformGrid>

 18: </Window>

如果你想要直接修改ComboBox背景顏色為自訂義漸層顏色，你應該會跟我遇到一樣的狀況，怎麼改都沒有作用@@

 1: <ComboBox Background="Yellow">

 2: <ComboBox.Resources>

 3: <!-- color of ComboBoxItem -->

 4: <SolidColorBrush x:Key="{x:Static SystemColors.WindowBrushKey}" Color="Yellow" />

 5: <!-- Mouse over color of ComboBoxItem -->

 6: <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Red" />

 7: </ComboBox.Resources>

 8: <ComboBoxItem>One</ComboBoxItem>

 9: <ComboBoxItem>Two</ComboBoxItem>

 10: <ComboBoxItem>Three</ComboBoxItem>

 11: </ComboBox>

一上二下排列，基本上可以先定義兩列兩行，然後針對第一列(Grid.Row=0)特別定義跨兩行，也就是Grid.ColumnSpan=”2”第二列因為沒有跨行所以不用另外定義Grid.ColumnSpan

 1: <Grid>

 2: <Grid.RowDefinitions >

 3: <RowDefinition Height="100" />

 4: <RowDefinition />

 5: </Grid.RowDefinitions>

 6: <Grid.ColumnDefinitions >

 7: <ColumnDefinition Width="200" />

 8: <ColumnDefinition />

 9: </Grid.ColumnDefinitions>

 10:  

 11: <!--Panel-->

 12: <Border Grid.Row="0" Grid.Column="0" Background="Blue" Grid.ColumnSpan="2" />

 13: <!--<Border Grid.Row="0" Grid.Column="1" Background="LightSalmon" />-->

 14: <Border Grid.Row="1" Grid.Column="0" Background="Green" />

 15: <Border Grid.Row="1" Grid.Column="1" Background="Red" />

 16: </Grid>

Markup Extensions and WPF XAML
新增一個類別 SaySomething.cs
定義兩個靜態屬性English和Chinese

 1: namespace WpfApp7

 2: {

 3: public class SaySomething

 4: {

 5: public static string English

 6: {

 7: get { return "Hello, how are you today?"; }

 8: }

 9: public static string Chinese

 10: {

 11: get { return "哈囉!今天好嗎?"; }

 12: }

 13: }

 14: }

加入參考 using System.Windows.Threading;