Autodesk 057A1-05A111-1001 Getting Started Guide - Page 80

74

|

Chapter 6

Precision Drawing

Draw with Coordinates

Coordinates represent locations in your drawing. When a command prompts you for a point, you

can use the cursor to specify a point in the drawing area or you can enter coordinate values.

Use Cartesian and Polar Coordinates

In two-dimensional space, you specify points on a plane that is similar to a flat sheet of grid paper.

You can enter two-dimensional coordinates as either

Cartesian (X,Y)

or

polar (distance<angle)

coordinates.

■

Cartesian coordinates

are measured from two perpendicular lines, the

X

axis and the

Y

axis. The

X

value specifies horizontal distance, and the

Y

value specifies vertical distance. For example, the

coordinates 5,3 represent a point 5 units along the

X

axis and 3 units along the

Y

axis. The

origin

(0,0) indicates where the two axes intersect.

■

Polar coordinates

use a distance and an angle to locate a point. For example, the coordinates

5<30 specifies a point that is a distance of 5 units from the origin and at a 30 degree angle from

the

X

axis.

You can use

absolute

or

relative

values with each method. Absolute coordinate values are based on

the origin. Relative coordinate values are based on the last point entered.

Draw with Absolute Cartesian Coordinates

Use absolute Cartesian coordinates when you know the precise

X

and

Y

values of the location of the

point. For example, the line in the illustration begins at an

X

value of –2 and a

Y

value of 1 and ends

at 3,4. The entries on the command line were as follows:

Command:

line

Specify first point:

#

–2,1

Specify next point or [Undo]

:

#

3,4

Entering the # identifies the coordinates as absolute coordinates.

Y

X

–X

-Y

0,0

-2,1

3,4

Section	Page
Contents	3
Index 169	5
Make the Transition from Paper to CAD	7
Draw to Scale	9
Lay Out Your Drawing	11
Organize Drawing Information	13
Establish Drafting Standards	15
Draw Efficiently	17
Draw Accurately	19
View Your Drawing	21
Create Dimensions and Text	23
Modify Your Drawing	25
Introduction	27
Why You Should Use this Guide	28
Tutorials and Command Access	28
Get Additional Information	29
Review and Recall	33
Work with Commands	35
Use the Mouse	36
Cancel a Command	36
Start a Command	36
Undo or Redo Commands	40
Review and Recall	40
Change Views	43
Zoom to Magnify a View	44
Pan to Reposition a View	45
Review and Recall	46
Drawing Setup	49
Start a Drawing	50
Plan the Drawing Units and Scale	52
Understand Models and Layouts	54
Organize Drawings with Layers	56
Tutorial: Tour a Drawing	58
Review and Recall	59
Draw Objects	61
Object Properties Overview	62
Draw Lines	70
Draw Circles and Arcs	73
Review and Recall	74
Precision Drawing	77
Set Grid and Snap Values	78
Draw with Coordinates	80
Snap to Precise Points on Objects	82
Object Snap Descriptions	84
Specify Angles and Distances	85
Review and Recall	88
Make Modifications	91
Select Objects to Edit	92
Erase, Extend, and Trim Objects	93
Duplicate Objects	96
Move and Rotate Objects	99
Fillet Corners	100
Use Editing Aids	115
Analyze Drawings	117
Review and Recall	118
Add Symbols and Hatches	121
Overview of Blocks	122
Insert Blocks	123
Overview of Hatches	125
Insert Hatches or Solid Fills	126
Review and Recall	128
Add Text to a Drawing	131
Create and Modify Text	132
Work with Text Styles	134
Set Text Size for the Viewport Scaling	135
Review and Recall	136
Add Dimensions	139
Dimensions Overview	140
Create Dimensions	141
Use Dimensioning Options	144
Create and Modify Dimension Styles	146
Modify Dimensions	148
Review and Recall	150
Create Layouts and Plots	153
Work with Layouts	154
Choose and Configure Plotters	157
Plot from a Layout	159
Review and Recall	164
Glossary	165

Autodesk 057A1-05A111-1001 Getting Started Guide - Page 80

Draw with Coordinates, Use Cartesian and Polar Coordinates, Draw with Absolute Cartesian Coordinates

Page 80 highlights