Merge pull request '封装预览区域绘制函数' (#4) from obsmain into master

Reviewed-on: obugs/RDTKEditor#4

MainWindow.xaml.cs

@@ -2,6 +2,7 @@
 using RDTKEditor.Models;
 using RhythmBase.Events;
 using SkiaSharp;
+using SkiaSharp.Views.Desktop;
 using System.ComponentModel;
 using System.Diagnostics;
 using System.Reflection;
@@ -16,6 +17,7 @@ namespace RDTKEditor
 	/// </summary>
 	public partial class MainWindow : Window
 	{
+		private SKSizeI _vsScale = new(1600,900);
 		private readonly RDTKView viewModel = new();
 		public MainWindow()
 		{
@@ -251,50 +253,35 @@ namespace RDTKEditor
 			});
 		}*/
 
-        private void mainUI_PaintSurface(object sender, SkiaSharp.Views.Desktop.SKPaintSurfaceEventArgs e)
+		private void mainUI_PaintSurface(object sender, SKPaintSurfaceEventArgs e)
 		{
 			var sfc = e.Surface;
 			var cvs = sfc.Canvas;
 			var info = e.Info;
-
-            // 清除画布
 			cvs.Clear(SKColors.Black);
-
-            // 获取绘图表面的宽度和高度
-            float width = info.Width;
-            float height = info.Height;
-
-            // 设置缩放比例
-            float scaleX = width / 1600f;
-            float scaleY = height / 900f;
-
-            // 保存画布状态
+			SKPoint scale = new(info.Width / _vsScale.Width, info.Height / _vsScale.Height);
 			cvs.Save();
+			cvs.Scale(scale);
+			Draw(cvs);
+			cvs.Restore();
+		}
+		private void Draw(SKCanvas canvas)
+		{
+			// 以 1600x900 为基准绘制
 
-            // 应用缩放
-            cvs.Scale(scaleX, scaleY);
-
-            // 绘制内容
-            cvs.DrawLine(0, 0, 1600, 900, new SKPaint
+			canvas.DrawLine(0, 0, _vsScale.Width, _vsScale.Height, new SKPaint
 			{
 				Color = SKColors.Red,
 				StrokeWidth = 3,
 				IsStroke = true,
 			});
-            cvs.DrawLine(0, 900, 1600, 0, new SKPaint
+			canvas.DrawLine(0, _vsScale.Height, _vsScale.Width, 0, new SKPaint
 			{
 				Color = SKColors.White,
 				StrokeWidth = 3,
 				IsStroke = true,
 			});
-
-            // 恢复画布状态
-            cvs.Restore();
-
-            // 打印绘图表面的尺寸
-            Debug.Print(info.Size.ToString());
 		}
-
 	}
 	public class MainViewModel : INotifyPropertyChanged
 	{