These sheets were then overlaid one on top of another to produce final drawings. The layers were often drawn on separate transparent sheets of paper. Traditional manual drafting used a similar approach. Layers help organize drawings by allowing users to place and manage related entities. One of LibreCAD’s key features is the ability to use layers. A maximum of eight user defined colors can be added. User defined colors can be modified by right-clicking on a user defined color and selecting a new hue and value. User defined colors are created by clicking the Add button and then selecting the hue and value from the color selection tool. Selecting ”Custom” will allow a selection from a palette of 36 colors and shades of grey or from a user defined colors. If the block’s color is subsequently changed all entities in the block will be assigned the block’s color. When editing a block, selecting ”By Block” will assign the color that was defined for the block to the added entity. If the layer’s selected color is subsequently changed all entities on the layer will be assigned the layer’s color. Selecting ”By Layer” will assign the color that was defined for the layer (see above) to the entity. The drop-down menu allows the color to be selected ”By Layer”, ”By Block”, from the ”Custom” color selector, or chosen quickly from one of the 16 pre-defined colors: Use the four Draw Order commands (under the Edit → Draw Order menu) to move entities up or down the z-axis.The color for an entity can be selected from the ”Color” selection drop-down menu. Each entity can be raised or lowered with respect to others, and each layer can contain entities that are at different points on the z-axis. Layers are displayed in alphabetical order in the layer list, and this is does not relate to the order that entities appear in the z-axis of the drawing. the checkbox in the layer settings window.right-click on a layer and choose "Toggle Construction Layer".You can toggle between construction and normal mode three ways: All lines of a construction layer are infinite in length.A construction layer won't appear on printout.Note: Construction layers were previously known as help layers.Ī construction layer is designed to hold geometry construction lines: With this option enabled you can move objects to a layer by selecting the objects and then selecting the destination layer. In the Attributes dialog, drop down the Layer selection box and choose the desired layer.Īlternatively you can activate the option Application Preferences → Defaults → Modify layer of selected entities, at layer activation.Select the continue action button (double right arrow).See Selections for a detailed description of how to select objects Select the objects you want to change the layer of.From the menu select Modify->Attributes.This describes how to move one or more objects between layers. Sometimes it is necessary to change an object's layer. Optionally specify the Color, Width and Line Type.Layers are usually created to hold objects with common attributes. layers were used to show different aspects of a drawing - for example this could be a layer set up for showing centre lines on an engineering drawing or to show different building systems, such as wiring and air conditioning. Whether for Engineering, Architectural or Construction drawing etc. In traditional manual drafting, a similar approach was used. In the latter case for example you can change the colour of all the entities on the "axes" layer by setting the colour (red for example) for that layer. Each entity can have its own attributes or have its attributes defined by the layer it is placed on. Layers can have their own attributes also (colour, line width, line style etc.). you might want to put all axes in a drawing on a layer named 'axes' (see Figure 1 below). Typically entities with a common 'function' or common attributes are put on the same layer. Every entity in a drawing is on exactly one layer and a layer can contain lots of entities. A basic concept in computer aided drafting is the use of layers to organize a drawing.
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