The company no longer develops Sketchup Make, its free desktop software, but you can download it from Trimble's archives. The SketchUp website offers a really impressive array of video and self-paced training options to help you along the way. The tools that have options are shown in the table below. If using the command line, the same tool options are available via the toolbar or the command line. and mouse to easily navigate large drawing Take measurements and add. If the tool options do not appear, from the menu select Widgets -> Toolbar -> and enable Tool Options. Current polygon area is by summation of: ( - y dx + x dy)/2 we can keep this for straight line edges, but add analytical solution for arc/elliptical arcs. LibreCAD is a free and open-source 2D CAD application that lets you edit DWG. Need to figure out an algorithm for arbitrary contour. Of course, if you're looking to put out detailed designs with accurate sizing and tolerances, you'll need to spend some time learning the ins and outs of the program. Re: Measurement input to CAD I think length works for spline in LibreCAD, by approximating spline with line segments. Even if you've never done any CAD work or 3D modeling before, you can pull together some really nice presentations in minutes. The interface makes it easy to get up to speed on the basics. SketchUp's free web-based version has plenty of power, but if you need additional functionality, you have to buy SketchUp Pro-and pay a hefty price tag. Trimble has enhanced it and developed it further and now offers a slew of related products. Menu 'Dimension->linear' for x/y dimension or ortogonal lines. Menu 'Info->distance point to point' (activate snap endpoints) Menu 'Info->Total length of selected entities' (selecting only the line) or you can draw a 'dimension'. In 2012, Google sold the product to Trimble. In 'CAD terminology' you can ask the length of a line of more than one way. QCAD allows you to create technical drawings, such as plans for. SketchUp was originally developed by Google and was one of the greatest free CAD packages ever put on the market. QCAD is an open-source program for computer-aided drawing (CAD) in two dimensions (2D). Ask again if you have any questions.Free feature is web-only with many important features hobbled. Then enter the relative address for the starting point of the line. This cancels the second point and you are asked to supply the starting point again. You are than asked to "Specify next point." Right click. You are asked to "Specify first point." Click on the current object at your given location (end point, mid point.). Assume that you already have an object on the screen. In this example I will use the 2 Points line command. If you are wanting to start drawing an object a certain distance away from an existing object it is easily accomplished. Scroll towards the bottom of the thread I have linked to below and read my description of the Snap icons. If using an absolute address then a point on a line makes no difference: 0,0 is absolute regardless of any point in the drawing. From there you can use relative addressing to specify a location. As an example, you can turn on Snap to End and the cursor will snap to an endpoint of the closest entity. An entity can be a line, rectangle, circle, etc. Line widths vary by purpose outline, hidden, section, etc., and by drawing size larger drawings utilize thicker lines. The range include ISO standard width lines. The point can be an end point, a middle point, a center point and so on. The LibreCAD default line thickness is 0.00 mm (hairline) and range up to 2.11 mm. Snaps are just what the name implies: snap the cursor to a point on an entity. I'm not sure what you mean when you say, "My issue, right now, is how do I select a specific point from a line, polyline, rectangle, etc." What throws me is the word "from a line." If you mean "on a line" then using a Snap will be the most accurate.
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