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Using Cartesian coordinatesMany commands in progeCAD require that you specify points as you draw or modify entities. You can do so by selecting points with the mouse or by typing coordinate values in the command bar. The program locates points in a drawing using a Cartesian coordinate system. Understanding how coordinate systems workThe Cartesian coordinate system uses three perpendicular axes—x, y, and z—to specify points in threedimensional space. Every location in a drawing can be represented as a point relative to a 0,0,0 coordinate point, referred to as the origin. To draw a twodimensional entity, you specify horizontal coordinate positions along the xaxis and vertical coordinate positions along the yaxis. Thus, every point on a plane can be represented as a coordinate pair composed of an xcoordinate and a ycoordinate. Positive coordinates are located above and to the right of the origin; negative coordinates are located to the left and below the origin. When you work in two dimensions, you need enter only the x and ycoordinates; the program assumes that the zaxis value is always the current elevation. When you work in three dimensions, however, you must also specify the zaxis value. When you look at a plan view of your drawing (a view from above, looking down), the zaxis extends straight up out of the screen at a 90degree angle to the xy plane. Positive coordinates are located above the xy plane, and negative coordinates are below the plane. All progeCAD drawings use a fixed coordinate system, called the World Coordinate System (WCS), and every point in a drawing has a specific x,y,zcoordinate in the WCS. You can also define arbitrary coordinate systems located anywhere in threedimensional space. These are called user coordinate systems and can be located anywhere in the WCS and oriented in any direction. You can create as many user coordinate systems as you want, saving or redefining them to help you construct threedimensional entities. By defining a UCS within the WCS, you can simplify the creation of most threedimensional entities into combinations of twodimensional entities. To help you keep your bearings in the current coordinate system, the program displays a coordinate system icon. When you begin a new drawing, you are automatically in the WCS, indicated by the letter W in the icon. When you display a drawing in plan view, you see the coordinate system icon from the top, with the zaxis directed straight toward you. When you display a threedimensional drawing in a view other than plan view, the coordinate system icon changes to reflect your new viewpoint. TIP The visible portions of the axes are the positive directions. The progeCAD UCS icon looks different from the UCS icon in AutoCAD, because it presents more information. Three colors represent the three axes, making it easier for you to recognize the orientation in threedimensional space:
If you prefer a single color for the cursor and UCS icon, you can make that change with the config or options command. Tell me about... 