SkiaSharp mega-sample

.github/workflows/build-pr.yml

@@ -77,13 +77,15 @@ jobs:
               }
             }
 
-            # Only proceed when his project has not been built yet
-            if (-not ($processedProjects -contains $file)) {
-              if ([string]::IsNullOrEmpty($projectToBuild)) {
-                  Write-Output "::warning:: Found no csproj for file $file"
-              }
-              else {
-                $projectToBuild = (Resolve-Path -Path $projectToBuild -Relative).Replace("\", "/")
+            if (-not [string]::IsNullOrEmpty($projectToBuild)) {
+              $projectToBuild = (Resolve-Path -Path $projectToBuild -Relative).Replace("\", "/")
+
+              # Only proceed when this project has not been built yet
+              if (-not ($processedProjects -contains $projectToBuild)) {
+                Write-Output "::notice:: $projectToBuild is not in processed builds yet"
+
+                $processedProjects += $projectToBuild
+                Write-Output "::notice:: Added $projectToBuild to processed builds"
 
                 if ($excluded_projects -contains $projectToBuild) {
                     Write-Output "::notice:: Skipping build for excluded project: $projectToBuild"
@@ -95,7 +97,6 @@ jobs:
                   Write-Output "::group:: Building $projectToBuild"
 
                   dotnet build $projectToBuild
-                  $processedProjects += $projectToBuild
 
                   if ($LASTEXITCODE -gt 0) {
                     Write-Output "::error:: Build failed for $projectToBuild"
@@ -116,6 +117,9 @@ jobs:
                 }
               }
             }
+            else {
+              Write-Output "::warning:: Found no csproj for file $file"
+            }
           }
 
         if ($failedProjectCount -gt 0) {

8.0/SkiaSharp/SkiaSharpDemos/README.md

@@ -0,0 +1,20 @@
+---
+name: .NET MAUI - SkiaSharp
+description: "This sample demonstrates the use of SkiaSharp in a .NET MAUI app."
+page_type: sample
+languages:
+- csharp
+- xaml
+products:
+- xamarin
+- dotnetmaui
+urlFragment: skiasharpmaui-demos
+---
+
+# .NET MAUI and SkiaSharp
+
+SkiaSharp is a 2D graphics system for .NET and C# powered by the open-source Skia graphics engine that's used extensively in Google products. You can use SkiaSharp in your .NET Multi-platform App UI (.NET MAUI) apps to draw 2D vector graphics, bitmaps, and text.
+
+This sample demonstrates the use of SkiaSharp in a .NET MAUI app.
+
+[!INCLUDE [Install SkiaSharp](../includes/install-skiasharp.md)]

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos.sln

@@ -0,0 +1,26 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34330.188
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SkiaSharpDemos", "SkiaSharpDemos\SkiaSharpDemos.csproj", "{63B3F69B-D30F-480D-B914-7390F2D1F52E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{63B3F69B-D30F-480D-B914-7390F2D1F52E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{63B3F69B-D30F-480D-B914-7390F2D1F52E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{63B3F69B-D30F-480D-B914-7390F2D1F52E}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{63B3F69B-D30F-480D-B914-7390F2D1F52E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{63B3F69B-D30F-480D-B914-7390F2D1F52E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {9E97E4D6-1629-4123-95D7-1B7108AD826A}
+	EndGlobalSection
+EndGlobal

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/App.xaml

@@ -0,0 +1,27 @@
+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:SkiaSharpDemos"
+             x:Class="SkiaSharpDemos.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+
+            <Style TargetType="StackLayout">
+                <Setter Property="Spacing" Value="6" />
+            </Style>
+            <Style TargetType="Grid">
+                <Setter Property="ColumnSpacing" Value="6" />
+                <Setter Property="RowSpacing" Value="6" />
+            </Style>
+            <Style TargetType="HorizontalStackLayout">
+                <Setter Property="Spacing" Value="6" />
+            </Style>
+
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>
+

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/App.xaml.cs

@@ -0,0 +1,12 @@
+namespace SkiaSharpDemos;
+
+public partial class App : Application
+{
+	public App()
+	{
+		InitializeComponent();
+
+		MainPage = new AppShell();
+	}
+}
+

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/AppShell.xaml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell
+    x:Class="SkiaSharpDemos.AppShell"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:local="clr-namespace:SkiaSharpDemos"
+    Shell.FlyoutBehavior="Disabled"
+    Title="SkiaSharpDemos">
+
+    <ShellContent
+        Title="Home"
+        ContentTemplate="{DataTemplate local:MainPage}"
+        Route="MainPage" />
+
+</Shell>
+

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/AppShell.xaml.cs

@@ -0,0 +1,10 @@
+namespace SkiaSharpDemos;
+
+public partial class AppShell : Shell
+{
+	public AppShell()
+	{
+		InitializeComponent();
+	}
+}
+

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/BasePage.cs

@@ -0,0 +1,20 @@
+using System.Windows.Input;
+
+namespace SkiaSharpDemos
+{
+	public class BasePage : ContentPage
+	{
+        public ICommand NavigateCommand { get; private set; }
+
+        public BasePage()
+        {
+            NavigateCommand = new Command<Type>(async (Type pageType) =>
+            {
+                Page page = (Page)Activator.CreateInstance(pageType);
+                await Navigation.PushAsync(page);
+            });
+
+            BindingContext = this;
+        }
+    }
+}

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/Basics/BasicBitmapsPage.cs

@@ -0,0 +1,128 @@
+using System.Reflection;
+using SkiaSharp;
+using SkiaSharp.Views.Maui;
+using SkiaSharp.Views.Maui.Controls;
+
+namespace SkiaSharpDemos.Basics
+{
+    public class BasicBitmapsPage : ContentPage
+    {
+        SKCanvasView canvasView;
+
+        HttpClient httpClient = new HttpClient();
+
+        SKBitmap webBitmap;
+        SKBitmap resourceBitmap;
+        SKBitmap libraryBitmap;
+
+        public BasicBitmapsPage()
+        {
+            Title = "Basic Bitmaps";
+
+            canvasView = new SKCanvasView();
+            canvasView.PaintSurface += OnCanvasViewPaintSurface;
+            Content = canvasView;
+
+            // Load resource bitmap
+            Assembly assembly = GetType().GetTypeInfo().Assembly;
+
+            using (Stream stream = assembly.GetManifestResourceStream("SkiaSharpDemos.Media.monkey.png"))
+            {
+                resourceBitmap = SKBitmap.Decode(stream);
+            }
+
+            // Add tap gesture recognizer
+            TapGestureRecognizer tapRecognizer = new TapGestureRecognizer();
+            tapRecognizer.Tapped += async (sender, args) =>
+            {
+                // Load bitmap from photo library
+                FileResult photo = await MediaPicker.Default.PickPhotoAsync();
+                if (photo != null)
+                {
+                    using (Stream stream = await photo.OpenReadAsync())
+                    {
+                        if (stream != null)
+                        {
+                            libraryBitmap = SKBitmap.Decode(stream);
+                            canvasView.InvalidateSurface();
+                        }
+                    }
+                }
+            };
+            canvasView.GestureRecognizers.Add(tapRecognizer);
+        }
+
+        protected override async void OnAppearing()
+        {
+            base.OnAppearing();
+
+            // Load web bitmap.
+            string url = "https://learn.microsoft.com/en-us/dotnet/maui/media/what-is-maui/maui-overview.png";
+
+            try
+            {
+                using (Stream stream = await httpClient.GetStreamAsync(url))
+                using (MemoryStream memStream = new MemoryStream())
+                {
+                    await stream.CopyToAsync(memStream);
+                    memStream.Seek(0, SeekOrigin.Begin);
+
+                    webBitmap = SKBitmap.Decode(memStream);
+                    canvasView.InvalidateSurface();
+                }
+            }
+            catch
+            {
+            }
+        }
+
+        void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
+        {
+            SKImageInfo info = args.Info;
+            SKSurface surface = args.Surface;
+            SKCanvas canvas = surface.Canvas;
+
+            canvas.Clear();
+
+            if (webBitmap != null)
+            {
+                float x = (info.Width - webBitmap.Width) / 2;
+                float y = (info.Height / 3 - webBitmap.Height) / 2;
+                canvas.DrawBitmap(webBitmap, x, y);
+            }
+
+            if (resourceBitmap != null)
+            {
+                canvas.DrawBitmap(resourceBitmap,
+                    new SKRect(0, info.Height / 3, info.Width, 2 * info.Height / 3));
+            }
+
+            if (libraryBitmap != null)
+            {
+                float scale = Math.Min((float)info.Width / libraryBitmap.Width,
+                                       info.Height / 3f / libraryBitmap.Height);
+
+                float left = (info.Width - scale * libraryBitmap.Width) / 2;
+                float top = (info.Height / 3 - scale * libraryBitmap.Height) / 2;
+                float right = left + scale * libraryBitmap.Width;
+                float bottom = top + scale * libraryBitmap.Height;
+                SKRect rect = new SKRect(left, top, right, bottom);
+                rect.Offset(0, 2 * info.Height / 3);
+
+                canvas.DrawBitmap(libraryBitmap, rect);
+            }
+            else
+            {
+                using (SKPaint paint = new SKPaint())
+                {
+                    paint.Color = SKColors.Blue;
+                    paint.TextAlign = SKTextAlign.Center;
+                    paint.TextSize = 48;
+
+                    canvas.DrawText("Tap to load bitmap", info.Width / 2, 5 * info.Height / 6, paint);
+                }
+            }
+        }
+    }
+}
+

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/Basics/BasicsMenuPage.xaml

@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<local:BasePage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+                xmlns:local="clr-namespace:SkiaSharpDemos"
+                x:Class="SkiaSharpDemos.Basics.BasicsMenuPage"
+                Title="SkiaSharp Drawing Basics">
+    <TableView Intent="Menu">
+        <TableRoot>
+            <TableSection Title="Drawing a Simple Circle">
+                <TextCell Text="Simple Circle"
+                          Detail="Outline and fill a circle with SkiaSharp"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.SimpleCirclePage}" />
+            </TableSection>            
+            <TableSection Title="Integrating with .NET MAUI">
+                <TextCell Text="Tap Toggle Fill"
+                          Detail="Tap the screen to toggle the circle fill"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.TapToggleFillPage}" />
+                <TextCell Text="Color Explore"
+                          Detail="Use sliders to select color"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.ColorExplorePage}" />
+            </TableSection>
+            <TableSection Title="Pixels and Device-Independent Units">
+                <TextCell Text="Surface Size"
+                          Detail="Display the surface size three different ways"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.SurfaceSizePage}" />
+                <TextCell Text="Ellipse Fill"
+                          Detail="Fill the surface with an ellipse"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.EllipseFillPage}" />
+            </TableSection>
+           <TableSection Title="Basic Animation">
+                <TextCell Text="Pulsating Ellipse"
+                          Detail="Animate the axes of an ellipse"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.PulsatingEllipsePage}" />
+                <TextCell Text="Expanding Circles"
+                          Detail="Animate circles to expand forever"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.ExpandingCirclesPage}" />
+            </TableSection>
+            <TableSection Title="Integrating Text and Graphics">
+                <TextCell Text="Framed Text"
+                          Detail="Draw a rounded rectangle around a text string"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.FramedTextPage}" />
+                <TextCell Text="Outlined Text"
+                          Detail="Outline text characters"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.OutlinedTextPage}" />
+            </TableSection>
+            <TableSection Title="Bitmap Basics">
+                <TextCell Text="Basic Bitmaps"
+                          Detail="Load and display bitmaps"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.BasicBitmapsPage}" />
+            </TableSection>
+            <TableSection Title="Transparency">
+                <TextCell Text="Code More Code"
+                          Detail="Animate the alpha channel to fade between text strings"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.CodeMoreCodePage}" />
+                <TextCell Text="Bitmap Dissolve"
+                          Detail="Use a transparency to dissolve between one bitmap and another"
+                          Command="{Binding NavigateCommand}"
+                          CommandParameter="{x:Type local:Basics.BitmapDissolvePage}" />
+            </TableSection>
+        </TableRoot>
+    </TableView>
+</local:BasePage>

8.0/SkiaSharp/SkiaSharpDemos/SkiaSharpDemos/Basics/BasicsMenuPage.xaml.cs

@@ -0,0 +1,9 @@
+namespace SkiaSharpDemos.Basics;
+
+public partial class BasicsMenuPage : BasePage
+{
+	public BasicsMenuPage()
+	{
+		InitializeComponent();
+	}
+}