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Autocad for dummies - Byrnes D.

Byrnes D. Autocad for dummies - Wiley publishing, 2007. - 435 p.
Download (direct link): autocad2006.pdf
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114 Part II: Let There Be Lines
computer screen and printed output, you’re probably familiar with the relevant color palette and how to use it. If you’re using AutoCAD for ordinary drafting or design, stick with the AutoCAD Color Index palette.
5. Click a color to select it as the color for this layer and click OK.
The Layer Properties Manager dialog box reappears. In the Name list, the color for the new layer changes to either the name or the number of the color that you selected.
AutoCAD’s first seven colors have both assigned numbers and standard names: 1 = red, 2 = yellow, 3 = green, 4 = cyan, 5 = blue, 6 = magenta, and 7 = white (but it appears black when displayed on a white background). The remaining 248 colors have numbers only.
6. On the same line as the new layer, click the Linetype name of the new layer.
The default AutoCAD linetype is Continuous, which means no gaps in the line.
The Select Linetype dialog box appears, as shown in Figure 5-7.
Figure 5-7:
The Select Linetype dialog box.
If you already loaded the linetypes you need for your drawing, the Select Linetype dialog box displays them in the Loaded Linetypes list. If not, click the Load button to open the Load or Reload Linetypes dialog box. By default, AutoCAD displays linetypes from the standard AutoCAD 2007 linetype definition file — acad.lin for imperial units drawings or acadiso.lin for metric units drawings. Load the desired linetype by selecting its name and clicking the OK button.
Unless you have a really good reason (for example, your boss tells you so), avoid loading or using any linetypes labeled ACAD_ISO. These line-types are normally used only in metric drawings and rarely even then. They overrule everything we’re trying to show you about printed lineweight in what follows, so if at all possible, just say NO to ACAD_ISO. We promise you’ll probably find it easier to use the linetypes with the more descriptive names: CENTER, DASHED, and so on.
Chapter 5: Get Ready to Draw 115
7. Click the desired linetype in the Loaded Linetypes list to select it as the linetype for the layer; then click OK.
The Select Linetype dialog box disappears, returning you to the Layer Properties Manager dialog box. In the Name list, the linetype for the selected layer changes to the linetype you just chose.
8. On the same line as the new layer, click the new layer’s lineweight.
The Lineweight dialog box appears, as shown in Figure 5-8.
Figure 5-8:
Lineweight dialog box.
9. Select the lineweight you want from the scrolling list and click OK.
The lineweight 0.00 mm tells AutoCAD to use the thinnest possible lineweight on the screen and on the plot. We recommend that, for now, you leave lineweight set to Default and instead map screen color to plotted lineweight, as described briefly in the “About colors and lineweights” sidebar earlier in this chapter and in greater detail in Chapter 13.
The default lineweight for the current drawing is defined in the Lineweight Settings dialog box. After you close the Layer Properties Manager dialog box, choose FormatOLineweight or enter LWEIGHT (or LW) at the command line to change the default lineweight.
You use the plot style property to assign a named plot style to the layer, but only if you’re using named plot styles in the drawing. (Chapter 13 explains why you probably don’t want to.) The Plot property controls whether the layer’s objects appear on plots. Toggle this setting off for any layer whose objects you want to see on the screen but hide on plots.
10. If you want to add a description to the layer, scroll the layer list to the right to see the Description column, click twice in the Description box corresponding to your new layer, and type a description.
If you choose to use layer descriptions, stretch the Layer Properties Manager dialog box to the right so that you can see the descriptions without having to scroll the layer list.
116 Part II: Let There Be Lines
11. Repeat Steps 2 through 10 to create any other layers that you want.
12. Select the new layer that you want to make current and click the Set Current button (the green check mark).
The current layer is the one on which AutoCAD places new objects that you draw.
13. Click OK to accept the new layer settings.
The Layer drop-down list on the Layers toolbar now displays your new layer as the current layer.
After you create layers, you can set any one of them to be the current layer. Make sure that no objects are selected and then choose the layer name from the Layer drop-down list on the Layers toolbar.
After you create layers and draw objects on them, you can turn a layer off or on to hide or show the objects on that layer. In the Layer Properties Manager dialog box, the first three icons to the right of the layer name control AutoCAD’s layer visibility modes.
* Off/On: Click the light bulb icon to toggle visibility of all objects on the selected layer. AutoCAD does not regenerate the drawing when you turn layers back on. (We give you the lowdown on regenerations in Chapter 8.)
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