底图首选项

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底图工作台的首选项可以在首选项编辑器中找到，它位于Edit → Preferences → Draft菜单。

此处有4个选项卡：通用设置、网格与捕捉、可视化设置，以及文本与标注。

通用设置

借助通用设置您可以调整特定的基本属性，如默认的工作平面, the name and color of the 构造组的名称与颜色, 克隆功能所用的前缀, 以及计算时所用的内部精度。

Grid and snapping

Grid and snapping allows you to set properties of the visible grid, which can be used with the Draft Snap methods.

By default the option "Always snap (disable snap mod)" is active, which means that you don't need to press a modifier key to activate the snapping tools. If this option is not active, you must press a modifier key to activate snapping.

You can set three modifiers:

Shift constraint modifier, to constraint the movement of the cursor along the X, Y, or Z axis.
Ctrl snap modifier, to snap the cursor to specific modes given by Draft Snap.
Alt alternative modifier, to activate an alternative function for a Draft tool.

You can specify the space between each grid line, between each major line, and the total number of lines displayed in the working plane.

Visuals settings

Visual settings allows you to specify the default line color and width for new objects, and the color of the Draft Snap symbols. By clicking the "Save current color and linewidth across sessions" checkbox, changes made in the Draft Tray will be saved and restored the next time you open FreeCAD.

Texts and dimensions

Texts and dimensions allows you to set default properties for the Draft Text, Draft Dimension, and Draft ShapeString tools, including default font and size, and style and size of the dimension lines. These properties can be changed in the individual text objects as well.