DRAW in Software

Make QR Code JIS X 0510 in Software DRAW

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10 Enter the LINE command and use the Intersection object snap to snap to the intersection of the two construction lines

If Intersection is not currently set as a running object snap, you can open the Object Snap toolbar and pick the Intersection button Another quick way to enter it is to type INT at the AutoCAD prompt

The XLINE command provides several options that allow you to create speci c types of construction lines 1 Enter the XLINE command and enter H for Horizontal 2 Pick a point anywhere on the screen; then move the crosshairs and pick a second point, and a third Because the Horizontal option is in effect, all of the construction lines are horizontal 3 Press ENTER to terminate the XLINE command and press ENTER or the spacebar to reenter it 4 Enter V for Vertical and pick three points anywhere on the screen The Vertical option forces all the lines to be exactly vertical

To create construction lines at angles other than 0 or 90 degrees, you can use the Angle option 1 Press ENTER to terminate the XLINE command and then reenter it 2 Enter A for Angle and enter 45 3 Place three construction lines 4 Terminate the XLINE command 5 Erase all but one construction line

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You may nd many occasions to use the Offset option of the XLINE command Offsetting a line means creating the line at a speci c distance from another line For example, suppose you have created a line that represents the outer edge of a sidewalk on an architectural site drawing If the sidewalk is to be 3 feet wide, you can create a construction line at an offset distance of 3 feet to show the width of the sidewalk 1 Enter XLINE and enter O for Offset 2 Enter 7 (for 7 mm), select the construction line, and pick a point on either side of it You will learn more about offsetting ordinary lines in 16

You can also create a construction line that is perpendicular to other objects on the screen 1 Terminate XLINE, reenter it, and select or enter the Perpendicular object snap 2 Pick one of the construction lines and pick another point elsewhere on the screen The new construction line is perpendicular to the one you selected 3 Terminate XLINE and erase all objects from the screen

Rays are a special type of construction line They extend from a single point into in nity in a radial fashion Rays are useful when you are laying out objects radially 1 From the Draw pull-down menu, pick Ray This enters the RAY command 2 Pick a point near the center of the screen 3 Move the pointing device in any direction and then pick several points around the rst point 4 Terminate the RAY command 5 Close the current drawing le and do not save your work (Snapdwg should still be open)

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Construction lines, rays, and the grid and snap features are often used to create multiview drawings A multiview drawing is one that describes a three-dimensional object completely using two or more two-dimensional views These views commonly include a front, top, and side view, although others are often necessary The AutoCAD features discussed in this chapter, coupled with object snap tracking, help you to produce multiview drawings using a technique known as orthographic projection As mentioned in 11, ortho means at right angles Orthographic projection, therefore, is the projection of views at right angles to one another Each adjacent view is projected at a right angle onto a plane, resulting in a two-dimensional view A plane is an imaginary at surface used to construct the two-dimensional view Figure 12-2 shows an example of a simple multiview drawing created using orthographic projection The right-side view is located to the right of the front view This positioning is standard It is important to use the standard positions because doing so allows other people to understand the position of these views at a glance The thin lines are temporary construction lines

Fig 12-2