A good CAD source code, a friend in need, the basic line drawing function has C# version.

Canvas\Backup\Canvas\About.cs
......\......\......\About.Designer.cs
......\......\......\About.resx
......\......\......\Canvas.csproj
......\......\......\Canvas.csproj.user
......\......\......\......Ctrl\Canvas.cs
......\......\......\..........\Canvas.Designer.cs
......\......\......\..........\Canvas.resx
......\......\......\..........\CanvasInterfaces.cs
......\......\......\DocumentForm.cs
......\......\......\DocumentForm.Designer.cs
......\......\......\DocumentForm.resx
......\......\......\.rawTools\ArcCircle3PointTool.cs
......\......\......\.........\ArcCircleTool.cs
......\......\......\.........\DrawToolsUtils.cs
......\......\......\.........\LineTool.cs
......\......\......\.........\SnapPoints.cs
......\......\......\EditTools\LineShrinkExtendEditTool.cs
......\......\......\.........\LinesMeetEditTool.cs
......\......\......\Layers\BackgroundLayer.cs
......\......\......\......\DrawingLayer.cs
......\......\......\......\GridLayer.cs
......\......\......\MainWin.cs
......\......\......\MainWin.Designer.cs
......\......\......\MainWin.resx
......\......\......\Model.cs
......\......\......\Options\GridPage.cs
......\......\......\.......\GridPage.Designer.cs
......\......\......\.......\GridPage.resx
......\......\......\.......\LayersPage.cs
......\......\......\.......\LayersPage.Designer.cs
......\......\......\.......\LayersPage.resx
......\......\......\.......\OptionsConfig.cs
......\......\......\.......\OptionsDlg.cs
......\......\......\.......\OptionsDlg.Designer.cs
......\......\......\.......\OptionsDlg.resx
......\......\......\Program.cs
......\......\......\...perties\AssemblyInfo.cs
......\......\......\..........\Resources.Designer.cs
......\......\......\..........\Resources.resx
......\......\......\..........\Settings.Designer.cs
......\......\......\..........\Settings.settings
......\......\......\Resources\CursorCollection.cs
......\......\......\.........\drawtoolimages.bmp
......\......\......\.........\edittoolimages.bmp
......\......\......\.........\hmove.cur
......\......\......\.........\Images.cs
......\......\......\.........\menuimages.bmp
......\......\......\Utils\GDIWrapper.cs
......\......\......\.....\MenuItemCollection.cs
......\......\......\.....\SerializeUtil.cs
......\......\......\.....\Undo.cs
......\......\......\.....\Utils.cs
......\......\Canvas.sln
......\......\Canvas.suo
......\......\.ommonTools\ColorPickerCtrl\ColorBar.cs
......\......\...........\...............\ColorPickerCtrl.cs
......\......\...........\...............\ColorPickerCtrl.Designer.cs
......\......\...........\...............\ColorPickerCtrl.resx
......\......\...........\...............\ColorPickerDialog.cs
......\......\...........\...............\ColorPickerDialog.Designer.cs
......\......\...........\...............\ColorPickerDialog.resx
......\......\...........\...............\ColorPickerTest.csproj
......\......\...........\...............\ColorTable.cs
......\......\...........\...............\ColorWheel.cs
......\......\...........\...............\ColorWheelCtrl.cs
......\......\...........\...............\ColorWheelCtrl.Designer.cs
......\......\...........\...............\ColorWheelCtrl.resx
......\......\...........\...............\EyedropColorPicker.cs
......\......\...........\...............\HSLColor.cs
......\......\...........\...............\Resources\colorbarIndicators.bmp
......\......\...........\...............\.........\eyedropper.bmp
......\......\...........\...............\.........\Images.cs
......\......\...........\...............\.........\popupcontainerbuttons.bmp
......\......\...........\ComboBox.cs
......\......\...........\CommonTools.csproj
......\......\...........\CommonTools.csproj.user
......\......\...........\DataBinding.cs
......\......\...........\DropdownContainerControl.cs
......\......\...........\Editors.cs
......\......\...........\LabelRotate.cs
......\......\...........\Line.cs
......\......\...........\NameObject.cs
......\......\...........\PropertyDialog\PropertyDialog.cs
......\......\...........\..............\PropertyDial

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