Each entity on the drawing should be dimensioned and dimensioned only once.The view that best shows an entity is the view that should be dimensioned.Provide space between dimensions to ensure legibility.Extension lines and entity lines should not overlap.Dimension and extension lines should not cross. There should be only one way to interpret any one dimension.This method works with line, circle, arc, etc. For example, after specifying the first point, type “100” and then - to place a point to 180 ° from the reference point. After placing the first point, the second, or subsequent, point can be placed by entering a numerical value for the distance and then press - for the direction. For example, “10.20” is equivalent to typing Refer to the User Guides for more details on using the command line.Īnother alternative when using the keyboard for defining a relative orthogonal coordinate is to specify a distance and then a direction with an arrow key up, down, left or right while holding the key. ”) in lieu of the comma between the X and Y values. Coordinates can be entered at the command line after selecting a drawing tool using the formats as shown previously “100,75” ( Cartesian) or “100<45” ( polar), absolute or relative (prefixed with offers an additional method for entering relative coordinates when using the numeric keypad type two decimal points (”. The commands are shown in the Drawing Tools. Tools can be selected by typing a command and then entering the coordinate values. The keyboard can be used to select tools and enter coordinates using the command line. In the above example a line thickness can applied to all entities on the “Walls” layer by changing the “Layer Settings” for that layer. However, the attributes assigned by the layer can be overridden for entities if necessary. Every entity on that layer will adopt the attributes that have been assigned to that layer. Layers have an added advantage that all the pen attributes can be assigned to a layer. For example, all the walls in a floor plan drawing would be put on a layer named “Walls”. Typically entities with common functions or attributes are put on the same layer. While one layer can contain multiple entities, every entity in a drawing can only be associated with single layer. Layers could be added to show centre lines or dimensions on an engineering or manufacturing drawings, or to show different building systems on architectural drawings such as exterior walls, partitions, electrical, HVAC, grid lines, etc. Whether for engineering, architectural, construction, manufacturing or other types, layers were used to show different aspects on the drawing. 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: The color for an entity can be selected from the ”Color” selection drop-down menu.
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