13.07.2015 Views

Alibre Design

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Chapter 4 - Sketching‣ To resize a rectangle:1. Choose the Select tool from the Sketching toolbar.2. Move the mouse pointer over an edge or a node.3. Click, hold the mouse button, and drag the sketch entity to resize the rectangle.4. Release the mouse button.‣ To move a rectangle:1. Choose the Select tool from the Sketching toolbar.2. Select the entire rectangle by dragging a selection rectangle around it.3. Hold the Shift key, click and hold the mouse button, and drag the rectangle.4. Release the mouse button.4.3.5 Spline Curves<strong>Alibre</strong> <strong>Design</strong> provides NURBS (B-spline) curve functionality in sketches. The maindistinguishing feature of the B-spline compared to "simple" splines is that it retains itsshape at all times. That is, it can only translate and rotate rigidly in order to satisfy theconstraints imposed on it.Creation of NURBS curves by control pointsUsing this method, you specify a set of control points in the Work Area to define the B-spline. Existing points can be identified. A preview is shown as you move the mouse.59

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