修复:直线偏移丢失颜色

src/Add-on/Offset.ts

@@ -92,11 +92,13 @@ export class Command_Offset implements Command
                     //直线在当前视图下偏移
                     let sp = cu.StartPoint;
                     let ep = cu.EndPoint;
+                    let color = cu.ColorIndex;
                     let newUCS = oldUCS.clone().setPosition(sp);
                     cu = new Line();
                     cu.OCS = newUCS;
                     cu.StartPoint = sp;
                     cu.EndPoint = ep;
+                    cu.ColorIndex = color;
                     app.Editor.UCSMatrix = newUCS;
                 }
 

src/GraphicsSystem/Viewer.ts

@@ -185,7 +185,8 @@ export class Viewer
                 antialias: true,//antialias:true/false是否开启反锯齿
                 precision: "highp",//precision:highp/mediump/lowp着色精度选择
                 alpha: false,//alpha:true/false是否可以设置背景色透明
-                logarithmicDepthBuffer: true
+                logarithmicDepthBuffer: true,
+                powerPreference: "high-performance",
                 // premultipliedAlpha: false,//?
                 // stencil: false,//?
                 // preserveDrawingBuffer: true,//preserveDrawingBuffer:true/false是否保存绘图缓冲