With a CAD system you will very often create lines that will not be on theįinal printout or which don't have the correct length and need to be More difficult things to learn when moving from paper to CAD. Of your drawing easily after you have created it. Theīig advantage of a CAD system is the fact that you can change every entity CAD systems offer many tools to achieve the same goal. Plan or a view of an object on a paper, you would use tools such as a ruler In many ways, CAD is similar to traditional drafting. Inserts that were previously made from that block will be updated toīlock (inserts) with different attributes, angles and scaling factors. The power of inserts is, that you can modify a block and all Once created, inserts are still dependent on the block they AnĮntity that is part of an insert can have its own attributes, inherit itsĪttributes from the layer it is placed on, or inherit them from the insert Inserts have attributes just like other entities. Such instances of a block are usuallyĬalled 'inserts'. Same drawing more than once at different locations, with differentĪttributes, scaling factors and rotation angles (see FigureĢ). Overlaid on one another to produce the final drawing.Ī block is a named group of entities.
QCAD FILTER BY COLOR MANUAL
Historically, in manual drafting, a similar approach has been used.ĭifferent building systems, such as wiring and air conditioning were oftenĭrawn on separate transparent sheet of paper. The drawing canĪlso be shown without any dimensions by hiding layer 'dimensions'. TheĬolor of all 'dimension' entities isdefined by the layer and can be easilyĬhanged by changing the color of the layer 'dimensions'. Style) and the entities on a layer usually inherit their attributes fromĪll dimensions of the drawing are placed on a layer named 'dimensions'. Every layer has attributes (color, line width, line Typically, allĮntities with a common 'function' or with common attributes are constructed
One layer and each layer can contain any number of entities. More complex and CAD specific entities include polylines,Įvery entity has certain attributes such as its color, line type andĪ basic concept of computer aided drafting is the use of layers to
Typical entities whichĪre supported by most CAD systems are: points, lines and circular andĮlliptical arcs. Please note that the concepts mentioned in this chapterĮntities are graphical objects in a CAD system. If you are used to working with CAD systems you might want to This chapter is intended as an introduction into the basic concepts ofĪ CAD system. QCad User Reference Manual - Basic CAD Concepts
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