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<center>LibreCAD User Reference Manual<br>
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<a name=""></a><h1> Contents</h1>
<p class="cont1"><a href="license.html#1">1 License</a></p>
<p class="cont2"><a href="license.html#1_1">Copyright</a></p>
<p class="cont2"><a href="license.html#1_2">Trademarks</a></p>
<p class="cont2"><a href="license.html#1_3">The GNU General Public License</a></p>
<p class="cont1"><a href="preface.html#2">2 Preface</a></p>
<p class="cont2"><a href="preface.html#2_1">Scope of This Manual</a></p>
<p class="cont2"><a href="preface.html#2_2">CAD - For the Uninitiated</a></p>
<p class="cont2"><a href="preface.html#2_3">Is LibreCAD for me?</a></p>
<p class="cont2"><a href="preface.html#2_4">Who Is Behind LibreCAD?</a></p>
<p class="cont2"><a href="preface.html#2_5">How can I get LibreCAD?</a></p>
<p class="cont2"><a href="preface.html#2_6">LibreCAD and Qt</a></p>
<p class="cont1"><a href="basics.html#3">3 Basic CAD Concepts</a></p>
<p class="cont2"><a href="basics.html#3_1">Entities</a></p>
<p class="cont2"><a href="basics.html#3_2">Attributes</a></p>
<p class="cont2"><a href="basics.html#3_3">Layers</a></p>
<p class="cont2"><a href="basics.html#3_4">Blocks</a></p>
<p class="cont2"><a href="basics.html#3_5">Drafting in CAD</a></p>
<p class="cont2"><a href="basics.html#3_6">Co-ordinate Systems</a></p>
<p class="cont3"><a href="basics.html#3_6_1">Origin</a></p>
<p class="cont3"><a href="basics.html#3_6_2">Cartesian Co-ordinates</a></p>
<p class="cont3"><a href="basics.html#3_6_3">Polar Co-ordinates</a></p>
<p class="cont2"><a href="basics.html#3_7">Object and Grid Snapping</a></p>
<p class="cont2"><a href="basics.html#3_8">Basic Editing</a></p>
<p class="cont3"><a href="basics.html#3_8_1">Entity Selection</a></p>
<p class="cont3"><a href="basics.html#3_8_2">Deletion</a></p>
<p class="cont3"><a href="basics.html#3_8_3">Modifications</a></p>
<p class="cont2"><a href="basics.html#3_9">Viewing in CAD</a></p>
<p class="cont1"><a href="start.html#4">4 Starting a LibreCAD Session</a></p>
<p class="cont2"><a href="start.html#4_1">Windows Operating Systems</a></p>
<p class="cont2"><a href="start.html#4_2">Linux / Unix Operating Systems</a></p>
<p class="cont2"><a href="start.html#4_3">Mac OS X Operating System</a></p>
<p class="cont1"><a href="gui.html#5">5 LibreCAD's User Interface</a></p>
<p class="cont2"><a href="gui.html#5_1">Main Application Window</a></p>
<p class="cont2"><a href="gui.html#5_2">Menu and CAD Toolbar</a></p>
<p class="cont2"><a href="gui.html#5_3">Layer- and Block List</a></p>
<p class="cont2"><a href="gui.html#5_4">Status Bar</a></p>
<p class="cont2"><a href="gui.html#5_5">Command Widget</a></p>
<p class="cont2"><a href="gui.html#5_6">Option Toolbar</a></p>
<p class="cont2"><a href="gui.html#5_7">Executing Commands</a></p>
<p class="cont2"><a href="gui.html#5_8">Modes</a></p>
<p class="cont3"><a href="gui.html#5_8_1">Command Mode</a></p>
<p class="cont3"><a href="gui.html#5_8_2">Normal Mode</a></p>
<p class="cont1"><a href="commandline.html#6">6 Command Line</a></p>
<p class="cont2"><a href="commandline.html#6_1">A Word About Keyboard Focus</a></p>
<p class="cont1"><a href="file.html#7">7 File Handling</a></p>
<p class="cont2"><a href="file.html#7_1">Create New Drawings</a></p>
<p class="cont2"><a href="file.html#7_2">Opening Drawings</a></p>
<p class="cont2"><a href="file.html#7_3">Saving Drawings</a></p>
<p class="cont2"><a href="file.html#7_4">Exporting Drawings as Bitmaps</a></p>
<p class="cont2"><a href="file.html#7_5">Closing Drawings</a></p>
<p class="cont1"><a href="printing.html#8">8 Printing</a></p>
<p class="cont2"><a href="printing.html#8_1">Print Preview</a></p>
<p class="cont2"><a href="printing.html#8_2">Print</a></p>
<p class="cont3"><a href="printing.html#8_2_1">Printing to Files</a></p>
<p class="cont1"><a href="edit.html#9">9 Basic Editing Commands</a></p>
<p class="cont2"><a href="edit.html#9_1">Undo</a></p>
<p class="cont2"><a href="edit.html#9_2">Redo</a></p>
<p class="cont2"><a href="edit.html#9_3">Copy</a></p>
<p class="cont2"><a href="edit.html#9_4">Cut</a></p>
<p class="cont2"><a href="edit.html#9_5">Paste</a></p>
<p class="cont1"><a href="view.html#10">10 Viewing</a></p>
<p class="cont2"><a href="view.html#10_1">Scrolling</a></p>
<p class="cont2"><a href="view.html#10_2">Redrawing</a></p>
<p class="cont2"><a href="view.html#10_3">Zooming In / Out</a></p>
<p class="cont2"><a href="view.html#10_4">Auto Zoom</a></p>
<p class="cont2"><a href="view.html#10_5">Window Zoom</a></p>
<p class="cont2"><a href="view.html#10_6">Panning</a></p>
<p class="cont1"><a href="layers.html#11">11 Layers</a></p>
<p class="cont2"><a href="layers.html#11_1">Changing the Visibility of a Layer</a></p>
<p class="cont2"><a href="layers.html#11_2">Changing the Visibility of all Layers</a></p>
<p class="cont2"><a href="layers.html#11_3">Adding New Layers</a></p>
<p class="cont2"><a href="layers.html#11_4">Deleting Layers</a></p>
<p class="cont2"><a href="layers.html#11_5">Editing Layer Attributes</a></p>
<p class="cont1"><a href="blocks.html#12">12 Blocks</a></p>
<p class="cont2"><a href="blocks.html#12_1">Changing the Visibility of a Block</a></p>
<p class="cont2"><a href="blocks.html#12_2">Changing the Visibility of all Blocks</a></p>
<p class="cont2"><a href="blocks.html#12_3">Adding New Blocks</a></p>
<p class="cont2"><a href="blocks.html#12_4">Removing Blocks</a></p>
<p class="cont2"><a href="blocks.html#12_5">Renaming Blocks</a></p>
<p class="cont2"><a href="blocks.html#12_6">Editing Blocks</a></p>
<p class="cont2"><a href="blocks.html#12_7">Inserting Blocks</a></p>
<p class="cont2"><a href="blocks.html#12_8">Creating Blocks from Existing Entities</a></p>
<p class="cont1"><a href="snapping.html#13">13 Object Snap</a></p>
<p class="cont2"><a href="snapping.html#13_1">Free Positioning</a></p>
<p class="cont2"><a href="snapping.html#13_2">Snap to Grid</a></p>
<p class="cont2"><a href="snapping.html#13_3">Snap to Endpoints</a></p>
<p class="cont2"><a href="snapping.html#13_4">Snap to Points on Entities</a></p>
<p class="cont2"><a href="snapping.html#13_5">Snap to Centers</a></p>
<p class="cont2"><a href="snapping.html#13_6">Snap to Middle Points</a></p>
<p class="cont2"><a href="snapping.html#13_7">Snap to Distance Points</a></p>
<p class="cont2"><a href="snapping.html#13_8">Snap to Intersections</a></p>
<p class="cont2"><a href="snapping.html#13_9">Snap to Intersections Manually</a></p>
<p class="cont2"><a href="snapping.html#13_10">Snap Restrictions</a></p>
<p class="cont3"><a href="snapping.html#13_10_1">Restrict Nothing</a></p>
<p class="cont3"><a href="snapping.html#13_10_2">Restrict Orthogonally</a></p>
<p class="cont3"><a href="snapping.html#13_10_3">Restrict Horizontally</a></p>
<p class="cont3"><a href="snapping.html#13_10_4">Restrict Vertically</a></p>
<p class="cont2"><a href="snapping.html#13_11">Relative Zero Point</a></p>
<p class="cont3"><a href="snapping.html#13_11_1">Moving the Relative Zero Point</a></p>
<p class="cont3"><a href="snapping.html#13_11_2">(Un-)locking the Relative Zero Point</a></p>
<p class="cont1"><a href="construction.html#14">14 Entity Drawing Commands</a></p>
<p class="cont2"><a href="construction_point.html#14_1">Points</a></p>
<p class="cont3"><a href="construction_point.html#14_1_1">Single Points</a></p>
<p class="cont2"><a href="construction_line.html#14_2">Lines</a></p>
<p class="cont3"><a href="construction_line.html#14_2_1">Sequence Of Lines</a></p>
<p class="cont3"><a href="construction_line.html#14_2_2">Line With Given Angle</a></p>
<p class="cont3"><a href="construction_line.html#14_2_3">Horizontal / Vertical Line</a></p>
<p class="cont3"><a href="construction_line.html#14_2_4">Rectangle</a></p>
<p class="cont3"><a href="construction_line.html#14_2_5">Parallel</a></p>
<p class="cont3"><a href="construction_line.html#14_2_6">Bisector</a></p>
<p class="cont3"><a href="construction_line.html#14_2_7">Tangent From Point to Arc / Circle</a></p>
<p class="cont3"><a href="construction_line.html#14_2_8">Tangent From Arc to Arc / Circle to Circle</a></p>
<p class="cont3"><a href="construction_line.html#14_2_9">Line Orthogonal to Another Entity</a></p>
<p class="cont3"><a href="construction_line.html#14_2_10">Line with Relative Angle to Another Entity</a></p>
<p class="cont3"><a href="construction_line.html#14_2_11">Freehand Line</a></p>
<p class="cont3"><a href="construction_line.html#14_2_12">Polygon with Center and Corner</a></p>
<p class="cont3"><a href="construction_line.html#14_2_13">Polygon with Two Corners</a></p>
<p class="cont2"><a href="construction_arc.html#14_3">Arcs</a></p>
<p class="cont3"><a href="construction_arc.html#14_3_1">Arc with Center, Radius and Angles</a></p>
<p class="cont3"><a href="construction_arc.html#14_3_2">Arc with 3 Points</a></p>
<p class="cont3"><a href="construction_arc.html#14_3_3">Parallel Arc</a></p>
<p class="cont2"><a href="construction_circle.html#14_4">Circles</a></p>
<p class="cont3"><a href="construction_circle.html#14_4_1">Circle with Center and Point</a></p>
<p class="cont3"><a href="construction_circle.html#14_4_2">Circle with Center and Radius</a></p>
<p class="cont3"><a href="construction_circle.html#14_4_3">Circle with 2 Points</a></p>
<p class="cont3"><a href="construction_circle.html#14_4_4">Circle with 3 Points</a></p>
<p class="cont3"><a href="construction_circle.html#14_4_5">Concentric Circle</a></p>
<p class="cont2"><a href="construction_ellipse.html#14_5">Ellipses</a></p>
<p class="cont3"><a href="construction_ellipse.html#14_5_1">Full Ellipse</a></p>
<p class="cont3"><a href="construction_ellipse.html#14_5_2">Ellipse Arc</a></p>
<p class="cont2"><a href="construction_text.html#14_6">Texts</a></p>
<p class="cont3"><a href="construction_text.html#14_6_1">Advanced Text Commands</a></p>
<p class="cont2"><a href="construction_dim.html#14_7">Dimensions</a></p>
<p class="cont3"><a href="construction_dim.html#14_7_1">Aligned Dimension</a></p>
<p class="cont3"><a href="construction_dim.html#14_7_2">Linear Dimensions</a></p>
<p class="cont3"><a href="construction_dim.html#14_7_3">Horizontal / Vertical Dimensions</a></p>
<p class="cont3"><a href="construction_dim.html#14_7_4">Radial Dimensions</a></p>
<p class="cont3"><a href="construction_dim.html#14_7_5">Diametric Dimensions</a></p>
<p class="cont3"><a href="construction_dim.html#14_7_6">Angular Dimensions</a></p>
<p class="cont3"><a href="construction_dim.html#14_7_7">Leader</a></p>
<p class="cont2"><a href="construction_hatch.html#14_8">Hatches and Solid Fills</a></p>
<p class="cont2"><a href="construction_image.html#14_9">Images</a></p>
<p class="cont1"><a href="selection.html#15">15 Entity Selection</a></p>
<p class="cont2"><a href="selection.html#15_1">Deselecting All</a></p>
<p class="cont2"><a href="selection.html#15_2">Selecting All</a></p>
<p class="cont2"><a href="selection.html#15_3">Selecting Single Entities</a></p>
<p class="cont2"><a href="selection.html#15_4">Selecting Contours</a></p>
<p class="cont2"><a href="selection.html#15_5">Window Deselection</a></p>
<p class="cont2"><a href="selection.html#15_6">Window Selection</a></p>
<p class="cont2"><a href="selection.html#15_7">Inverting Selection</a></p>
<p class="cont2"><a href="selection.html#15_8">Deselect Intersected Entities</a></p>
<p class="cont2"><a href="selection.html#15_9">Select Intersected Entities</a></p>
<p class="cont1"><a href="modification.html#16">16 Modification</a></p>
<p class="cont2"><a href="modification.html#16_1">Move</a></p>
<p class="cont2"><a href="modification.html#16_2">Rotate</a></p>
<p class="cont2"><a href="modification.html#16_3">Scale</a></p>
<p class="cont2"><a href="modification.html#16_4">Mirror</a></p>
<p class="cont2"><a href="modification.html#16_5">Move and Rotate</a></p>
<p class="cont2"><a href="modification.html#16_6">Rotate and Counter-rotate (Rotate 2)</a></p>
<p class="cont2"><a href="modification.html#16_7">Trim / Extend</a></p>
<p class="cont2"><a href="modification.html#16_8">Trim Two Entities</a></p>
<p class="cont2"><a href="modification.html#16_9">Lengthen</a></p>
<p class="cont2"><a href="modification.html#16_10">Bevel</a></p>
<p class="cont2"><a href="modification.html#16_11">Round</a></p>
<p class="cont2"><a href="modification.html#16_12">Divide</a></p>
<p class="cont2"><a href="modification.html#16_13">Stretch</a></p>
<p class="cont2"><a href="modification.html#16_14">Properties</a></p>
<p class="cont2"><a href="modification.html#16_15">Attributes</a></p>
<p class="cont2"><a href="modification.html#16_16">Deleting Entities</a></p>
<p class="cont2"><a href="modification.html#16_17">Exploding Groups</a></p>
<p class="cont1"><a href="information.html#17">17 Getting Measurements</a></p>
<p class="cont2"><a href="information.html#17_1">Distance (Point, Point)</a></p>
<p class="cont2"><a href="information.html#17_2">Distance (Entity, Point)</a></p>
<p class="cont2"><a href="information.html#17_3">Angle</a></p>
<p class="cont1"><a href="options_general.html#18">18 Application Preferences</a></p>
<p class="cont2"><a href="options_general.html#18_1">Appearance</a></p>
<p class="cont3"><a href="options_general.html#18_1_1">Language</a></p>
<p class="cont3"><a href="options_general.html#18_1_2">Graphic View</a></p>
<p class="cont2"><a href="options_general.html#18_2">Paths</a></p>
<p class="cont1"><a href="options_drawing.html#19">19 Drawing Preferences</a></p>
<p class="cont2"><a href="options_drawing.html#19_1">Paper</a></p>
<p class="cont2"><a href="options_drawing.html#19_2">Units</a></p>
<p class="cont2"><a href="options_drawing.html#19_3">Dimensions</a></p>
<p class="cont1"><a href="appendix.html#20">20 Appendix</a></p>
<p class="cont2"><a href="appendix_hotkeys.html#20_1">Hotkeys</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_1">Command Line</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_2">File Handling</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_3">Basic Editing</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_4">View</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_5">Layer Handling</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_6">Snapping</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_7">Construction</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_8">Dimensioning</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_9">Entity Selection</a></p>
<p class="cont3"><a href="appendix_hotkeys.html#20_1_10">Modification</a></p>
<p class="cont2"><a href="appendix_fonts.html#20_2">Fonts</a></p>
<p class="cont2"><a href="appendix_patterns.html#20_3">Patterns</a></p>
<p class="cont2"><a href="appendix_expressions.html#20_4">Mathematical Expressions</a></p>
<p class="cont3"><a href="appendix_expressions.html#20_4_1">Supported Constants</a></p>
<p class="cont3"><a href="appendix_expressions.html#20_4_2">Supported Functions</a></p>
<p class="cont2"><a href="appendix_units.html#20_5">Drawing Units</a></p>
<p class="cont3"><a href="appendix_units.html#20_5_1">Supported Length Units</a></p>
<p class="cont3"><a href="appendix_units.html#20_5_2">Display Formats for Lengths</a></p>
<p class="cont3"><a href="appendix_units.html#20_5_3">Supported Angle Units</a></p>
<p class="cont3"><a href="appendix_units.html#20_5_4">Display Formats for Angles</a></p>
<p class="cont2"><a href="appendix_papers.html#20_6">Supported Paper Formats</a></p>
<p class="cont3"><a href="appendix_papers.html#20_6_1">Metric (ISO)</a></p>
<p class="cont3"><a href="appendix_papers.html#20_6_2">Other Formats</a></p>
<p class="cont2"><a href="appendix_LibreCAD1.html#20_7">Migration from LibreCAD 1</a></p>
<p class="cont3"><a href="appendix_LibreCAD1.html#20_7_1">DXF Compatibility</a></p>
<p class="cont3"><a href="appendix_LibreCAD1.html#20_7_2">Layer Handling</a></p>
<p class="cont2"><a href="appendix_bib.html#20_8">Bibliography</a></p>
<p class="cont1"><a href="index2.html#"> Index</a></p>
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