general bars
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1. A horizontal line dal zu ala A rectangle Parallels with distance Tangents from points to circles Tangents to circles orthogonal to lines va va a Ale SIN air Lines with relative angles a Polygons with two corners look tool options bar ou A line by a given angle A vertical line A bisector Parallels through points Tangents from circle to circle Orthogonal lines Polygons with center and corner Free hand lines The way to draw lines in each of the option in the sub menu is quite simple first click on the first point snap or entity then click on the second point snap or entity and a line LibreCad User manual page 6 will be displayed on the screen To create vertical lines horizontal lines or lines with a given angle after selecting the icon a Feature menu will appear in tool options bar and here length angles are set BA De MAB EE Close Lindo Redo NL In the example instead there is a line between two points Select a point 1 and another point 1 and a line will be created Notice that the command line is not deactivated so each further click will generate a line from the last point of the previous2. Tangent to other 2 circles HIA with 3 lines with radius given GE GE Tangent to other 2 circles HEE passing through a given point Tangent to a circle passing two given points Tangent to other 3 circles In the example down here is shown a circle inscribed in a polyline 7 The polyline 1 is the shape tangent to the circle that has to be created to obtain the circle simply click on the relative icon select the three lines and the result is a circle inscribed in the polyline 2 ELLYPSES a The command ellypses is very similar to the command circle so it will be shown the sub menu to list the options of this command to create ellypses With center and 2 points iS SN With center 2 points and angle oa Fa By 4 points on ellypse By Foci and point on ellypse ole Inscribed in a quadrilateral or tangent to 4 lines By center and 3 points on ellypse LibreCad User manual page 8 POLYLINES 222222222222 SPLINES NY This icon allows to create splines once the command is selected is just enough to click the location needed to locate the points of the desired spline Here an example 1 1 HATCHES In order to Filla border 1 with a hatch the shortest way is to select the entire contour that needs to be filled with the hatch 2 then click on the relat
3. LibreCad User manual version 2 0 0 beta 1 LibreCAD LibreCad User manual page 1 GENERAL BARS THE FILE BAR be Ha dd This bar is the basic bar that you may find in any other applications is quite standard looking at the picture under the title there are in order Please notice that LibreCad operates with DXF file format THE EDIT BAR BE DA New file Open a file Save File Print draw Print preview This is another common bar that many other programs have there is nothing specific considering the cad side the icons Function are in order THE VIEW BAR p PI p gt je pi p This bar is a bit more specific it allows to Switch to selection pointer Undo the last operation Redo the last operation Cut Copy Past e Show the grid e Turn on off the draft mode e Redraw the work e Zoom in e Zoom out e Auto zoom e Previous view e Zoom a selected window e Activate the pan LibreCad User manual page 2 COORDINATES Before to start with the cad commands it is really important to have clear the meaning of the word coordinate IF you are already into others cad system probably this little chapter is not necessary to be read A Cartesian coordinate system it is a system that specifies each point uniquely in a plane by a pair of numerical coordinates 1 which are the signed distances from the point to two fixed orthogonal directed line
4. ers 0 simplify the operation Then to draw a line from this new origin to the green point the first coordinates are 0 0 and the second coordinates are 3 5 5 5 Now if want to draw a line from the violet point to the green point we need to enter other coordinates of the violet point because now it does not lays on the origin the origin is 1 5 2 5 so the difference between the violet and blue point is 1 5 2 5 Finally to draw a line from violet point to the green point having the origin is blue point the coordinates are first point violet 1 5 2 5 second point green 3 5 5 5 LibreCad User manual page 3 CAD BARS LAYERS Layer List x Layers are useful to visualize only certain entities or put together entities with similar proprieties depending on preferences needs kind of work planning As shown in the picture there is the layer 0 always present as default More in detail this section this icon shows all the layers in the work and this icon hides them all this icon add a layer this icon remove a layer with this icon is possible to set the layer s name color width and line type Considering the list here below there are other proprieties This show removes a L h the relative layer Ayar Searg sk ao 2 A Defpoints dimensions E This freeze doors windows the relative layer if Ci iftline Active layer Ei atche
5. ive icon then give confirm Finally choose the hatch and the scale and the hatch will be created 3 In alternative it is possible have hatches by clicking the relative icon click the relative icon on the select deselect invert selection etc hatches sub menu depending on the need and give confirm then select the hatch and the scale Scale and angle obviously will not work on solid fill In the example above there is a concrete hatch scale 1 5 angle 0 LibreCad User manual page 9 LibreCad User manual page 10
6. line to the point where the mouse has been clicked the last time 2 In this case notice also that the grid is show and the grid snap is active This result is possible even by giving the line coordinates from the command line To give relatives coordinates before coordinate values the symbol that switch the origin ARCS m To create an arc simply click on the relative icon even in this case a sub menu will appear and for each icon will be drawn an arc with special features This command is similar to command line By point and angle Bann al By trhee points s o pl En F Ge Concentric Tangential to base entity with radius Here an example 1 2 To create an arc with three points on this figure click on the arc icon then click on the relative sub menu icon then on the endpoints 1 and the figure 2 is the result Notice LibreCad User manual page 7 that to have a precise arc on specific points the snap endpoint must be activated CIRCLES Circles are created clicking on the relative icon and when this icon is clicked a sub menu will appear this menu allows to create circles With center and a specific point OG With 2 opposite points Gp Passing through three points Concentric dD With center and a radius Inscribed in a triangle polyline
7. s This print or not i other the entities relative ee ET 2 J profiles to the layer LibreCad User manual page 4 Moreover clicking with right mouse button you can select if defreeze or Freeze layer add or remove a layer edit a layer or toggle its visualisation Examining the menu below By Layer hl By Layer By Layer it allows to draw entities with different features from the others of the same layer select color width line type all this before creating entities after set new preferences the Further entities will have the new features e g if layer 0 has white color and then the color selected is yellow From the changings selected all entities will be yellow not white THE SNAP SELECTION BAR Ju HE A is J AR ax tila 8 This is the very first cad bar when entities line circle etc are drawn this bar allows to bind the First point of the entity and the Following others in order of the picture above respectively e free e toanend point e toa point on an entity e tocentre point e tothe middle point look tool options bar e toa distance from an entity e toanintersection point e horizontally e vertically The last two icons set the relative zero and lock its position THE TOOL OPTIONS BAR This bar is mainly empty but selecting some particular tool For example the snap middle From the snap bar or the print preview tool options bar bar will change like shown belo
8. s measured in the same unit of length Each reference line is called a coordinate axis or just axis of the system and the point where they meet is its origin usually at ordered pair 0 0 The coordinates can also be defined as the positions of the perpendicular projections of the point onto the two axes expressed as signed distances from the origin the picture explains those concepts In LibreCad Cartesian coordinates can be inserted considering two cases that may give the same result 1 Absolute coordinates the origin lays on the coordinates 0 0 2 Relative coordinates the origin does not lay in coordinates 0 0 To simplify those concepts let s suppose that want to locate the green point in Figure 1 1 The distance of the green point from origin is 2 on the X axis is and 3 on the Y axis so to draw a line From the violet point that lays on the origin to the green point we need to consider the coordinates of the violet point 0 0 and the green point is 2 3 The coordinates are first point violet 0 0 second point green 2 3 2 In this case the origin does not lays on 0 0 but in another point We pretend the origin switch to the blue point Now the distance between the blue point and the green point is given by the algebraic differences between the coordinates of the green point and the coordinates of the blue point so the distance is 3 5 5 5 In case1 too is used this method but the operation results simplier because the numb
9. w Middle Points This option increase or This option allows the user Those three icons decrease the number to assign a scale to the print toggle black white mode of middle points selecting Fixed will center draw on paper Freeze the scale inserted fit the draw on paper In this case notice that clicking on the icon fit on paper will automatically assign a scale in the print See Further chapter PRINT Sometimes selecting an icon may seem to have not enough options so attention on the icons in this manual related to this bar LibreCad User manual page 5 THE CAD TOOLS BAR SD Oo AL m Dm SE This is the bar that allow to create entities modify them dimension them create blocks and select entities In LibreCad is very simple create and modify entities it is enough click on relative icon lines circles ellypses polilines splnes click the relative icon in the sub menu that may appear and give the imput desired To enter a text is enough to click on the relative icon and set the attributes of the tex at the left of the editor and enter the text in the right in the very editor LINES ida This is one of the most used command among all the commands Depending on the SNAP BAR that allows to bind entities to snaps bind lines in this case clicking on this icon will show a new sub menu that allows to draw lines A line by two points
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