本文介绍了[UWP]如何在C＃UWP中旋转Win2D绘图项？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个DrawingUI类，它绘制一个矩形，图像项位于中心。
I have a DrawingUI class that draws a rectangle with image item in center.
public class DrawingUI : IDrawingUI
{
public double X { get; set; }
public double Y { get; set; }
public double Rotation { get; set; }
public CanvasBitmap Image { get; set; }
public double Width { get; set; }
public double Height { get; set; }
public bool Editing { get; set; }
public Size Bound { get; set; }
public Rect Region
{
get
{
return new Rect(X - Width / 2, Y - Height / 2, Width, Height);
}
}
public Rect RightTopRegion
{
get
{
return new Rect(X + Width / 2 + 2 - 8, Y - Height / 2 - 2 - 8, 16, 16);
}
}
public Rect RightBottomRegion
{
get
{
return new Rect(X + Width / 2 + 2 - 8, Y + Height / 2 + 2 - 8, 16, 16);
}
}
public void SyncWH()
{
Height = (Image.Size.Height / Image.Size.Width) * Width;
}
/// <summary>
/// Draw
/// </summary>
/// <param name="graphics"></param>
public void Draw(CanvasDrawingSession graphics, float scale)
{
if (Image != null)
{
graphics.DrawImage(Image, new Rect((X - (Width / 2)) * scale, (Y - (Height / 2)) * scale, Width * scale, Height * scale));
}
else
{
graphics.DrawText("loading...", ((float)X - 12) * scale, ((float)Y - 2) * scale, Colors.Orange, new Microsoft.Graphics.Canvas.Text.CanvasTextFormat() { FontSize = 11 });
}
if (Editing && scale == 1) //If it is edited state and there is no zoom
{
graphics.DrawRectangle(new Rect(X - Width / 2 - 2, Y - Height / 2 - 2, Width + 4, Height + 4), Windows.UI.Colors.Orange, 0.5f, new CanvasStrokeStyle() { DashStyle = CanvasDashStyle.DashDot });
graphics.FillCircle((float)(X + Width / 2 + 2), (float)(Y - Height / 2 - 2), 8, Colors.Orange); //Cancel button
graphics.DrawLine((float)(X + Width / 2 + 2) - 4, (float)(Y - Height / 2 - 2) - 4, (float)(X + Width / 2 + 2) + 4, (float)(Y - Height / 2 - 2) + 4, Colors.White);
graphics.DrawLine((float)(X + Width / 2 + 2) - 4, (float)(Y - Height / 2 - 2) + 4, (float)(X + Width / 2 + 2) + 4, (float)(Y - Height / 2 - 2) - 4, Colors.White);
graphics.FillCircle((float)(X + Width / 2 + 2), (float)(Y + Height / 2 + 2), 8, Colors.Orange); //Scale
graphics.DrawLine((float)(X + Width / 2 + 2 - 4), (float)(Y + Height / 2 + 2 - 4), (float)(X + Width / 2 + 2 + 4), (float)(Y + Height / 2 + 2 + 4), Colors.White);
graphics.DrawLine((float)(X + Width / 2 + 2 - 4), (float)(Y + Height / 2 + 2 - 4), (float)(X + Width / 2 + 2 - 4), (float)(Y + Height / 2 + 2), Colors.White);
graphics.DrawLine((float)(X + Width / 2 + 2 - 4), (float)(Y + Height / 2 + 2 - 4), (float)(X + Width / 2 + 2), (float)(Y + Height / 2 + 2 - 4), Colors.White);
graphics.DrawLine((float)(X + Width / 2 + 2 + 4), (float)(Y + Height / 2 + 2 + 4), (float)(X + Width / 2 + 2), (float)(Y + Height / 2 + 2 + 4), Colors.White);
graphics.DrawLine((float)(X + Width / 2 + 2 + 4), (float)(Y + Height / 2 + 2 + 4), (float)(X + Width / 2 + 2 + 4), (float)(Y + Height / 2 + 2), Colors.White);
}
}
}
我的主页.xaml
<Page
x:Class="CSharp_Studio.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:CSharp_Studio"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:canvas="using:Microsoft.Graphics.Canvas.UI.Xaml"
d:DesignHeight="400"
xmlns:views="using:CSharp_Studio.Views"
mc:Ignorable="d">
<Grid >
<canvas:CanvasControl
x:Name="MainCanvas"
RelativePanel.AlignHorizontalCenterWithPanel="True"
RelativePanel.AlignVerticalCenterWithPanel="True"
Draw="MainCanvas_Draw"
ManipulationMode="TranslateX,TranslateY,Rotate"
ManipulationStarted="MainCanvas_ManipulationStarted"
ManipulationCompleted="MainCanvas_ManipulationCompleted"
ManipulationDelta="MainCanvas_ManipulationDelta"
Tapped="MainCanvas_Tapped"></canvas:CanvasControl>
</Grid>
</Page>
My MainPage.cs
My MainPage.cs
public sealed partial class MainPage : Page
{
IDrawingUI drawingUI;
public MainPage()
{
this.InitializeComponent();
this.Loaded += MainPage_Loaded;
}
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
DrawItem();
}
private async void DrawItem(string fileName = "ms-appx:///Images/web.jpg")
{
drawingUI = new DrawingUI()
{
Editing = true,
Height = 100,
Width = 100,
Image = null,
X = 150,
Y = 150,
};
this.MainCanvas.Invalidate();
CanvasDevice device = CanvasDevice.GetSharedDevice();
var img = await CanvasBitmap.LoadAsync(device, new Uri(fileName));
if (img != null)
{
(drawingUI as DrawingUI).Width = img.Size.Width;
(drawingUI as DrawingUI).Height = img.Size.Height;
(drawingUI as DrawingUI).Image = img;
}
}
private void MainCanvas_ManipulationStarted(object sender, Windows.UI.Xaml.Input.ManipulationStartedRoutedEventArgs e)
{
if (drawingUI != null)
{
if ((drawingUI as DrawingUI).Region.Contains(e.Position)) {
ManipulationType = 3;
PrePosition = e.Position;
(drawingUI as DrawingUI).Editing = true;
}
if ((drawingUI as DrawingUI).RightBottomRegion.Contains(e.Position) && (drawingUI as DrawingUI).Editing) {
ManipulationType = 4;
PrePosition = e.Position;
}
MainCanvas.Invalidate();
}
}
int ManipulationType = 0;
Point? PrePosition;
private void MainCanvas_ManipulationCompleted(object sender, Windows.UI.Xaml.Input.ManipulationCompletedRoutedEventArgs e)
{
}
private void MainCanvas_ManipulationDelta(object sender, Windows.UI.Xaml.Input.ManipulationDeltaRoutedEventArgs e)
{
if (drawingUI != null && PrePosition != null)
{
var deltaX = e.Position.X - PrePosition.Value.X;
var deltaY = e.Position.Y - PrePosition.Value.Y;
if (ManipulationType == 3) //mobile
{
(drawingUI as DrawingUI).X += deltaX;
(drawingUI as DrawingUI).Y += deltaY;
(drawingUI as DrawingUI).Rotation = e.Delta.Rotation;
}
else if (ManipulationType == 4) //Scale
{
(drawingUI as DrawingUI).Width += deltaX * 2;
(drawingUI as DrawingUI).SyncWH(); //Only need to set the width height automatically sync
}
PrePosition = e.Position;
MainCanvas.Invalidate();
}
}
private void MainCanvas_Tapped(object sender, Windows.UI.Xaml.Input.TappedRoutedEventArgs e)
{
}
private void MainCanvas_Draw(Microsoft.Graphics.Canvas.UI.Xaml.CanvasControl sender, Microsoft.Graphics.Canvas.UI.Xaml.CanvasDrawEventArgs args)
{
var target = GetDrawing(true); //
if (target != null)
{
args.DrawingSession.DrawImage(target);
}
}
private CanvasRenderTarget GetDrawing(bool edit = true)
{
MainCanvas.Width = Window.Current.Bounds.Width;
MainCanvas.Height = Window.Current.Bounds.Height;
double w = 200, h = 200; // Canvas size
if (edit) //Edit status
{
w = MainCanvas.ActualWidth;
h = MainCanvas.ActualHeight;
}
var scale = edit ? 1 : w / MainCanvas.Width; //scaling ratio
CanvasDevice device = CanvasDevice.GetSharedDevice();
CanvasRenderTarget target = new CanvasRenderTarget(device, (float)w, (float)h, 96);
using (CanvasDrawingSession graphics = target.CreateDrawingSession())
{
//Draw the background
graphics.Clear(Colors.Black);
if (drawingUI != null)
{
drawingUI.Draw(graphics, (float)scale);
}
}
return target;
}
}结果很好我可以调整大小或拖动到CanvasControl的任何位置但是如何实现此绘图的旋转？
The result is good I can resize or drag to any position of CanvasControl but how to implement the rotation for this drawing?
//结果
amazestudio24
amazestudio24
推荐答案
嗨amazestudio24，
你可以使用
Matrix3x2.CreateRotation 创建旋转图像。如下代码：
You could useMatrix3x2.CreateRotation to create a rotate image. Like the following code:
private void canvas_Draw(Microsoft.Graphics.Canvas.UI.Xaml.CanvasControl sender, Microsoft.Graphics.Canvas.UI.Xaml.CanvasDrawEventArgs args)
{
args.DrawingSession.Transform *= Matrix3x2.CreateRotation((float)Math.PI / 2, new Vector2(200));
args.DrawingSession.DrawText("Hello, World!", 100, 100, Colors.Black);
}
的效果。它也可以创建旋转效果。像这样：
Also, after searching the document, I found another effect calledTransform2DEffect. It could also create rotation effect. Like this:
ICanvasImage image = new Transform2DEffect
{
Source = SourceBitMap,
TransformMatrix = Matrix3x2.CreateRotation((float)(60 * Math.PI / 180)),
};
您可以参考官方的Win2D示例获取更多信息：
You could refer the official Win2D sample for more information:https://github.com/Microsoft/Win2D/blob/master/samples/ExampleGallery/Shared/EffectsExample.xaml.cs
最好的问候，
罗伊
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