Graphics Programs Reference
In-Depth Information
The AutoCAD coordinate system
In the AutoCAD 2D coordinate system, units are measured horizontally
in terms of X and vertically in terms of Y. A 2D point in the AutoCAD
drawing area can be determined in terms of X,Y (in this topic referred
to as
x
,
y
).
x
,
y
0,0 is the
origin
of the system. The coordinate point
x
,
y
100,50 is 100 units to the right of the origin and 50 units above the
origin. The point
x
,
y
50 is 100 units to the left of the origin
and 50 points below the origin. Fig. 1.20 shows some 2D coordinate points
in the AutoCAD window.
100,
Fig. 1.20
The 2D coordinate points in the AutoCAD coordinate system
3D coordinates include a third coordinate (Z), in which positive Z units are
towards the operator as if coming out of the monitor screen and negative Z
units going away from the operator as if towards the interior of the screen.
3D coordinates are stated in terms of
x
,
y
,
z. x
,
y
,
z
100,50,50 is 100 units
to the right of the origin, 50 units above the origin and 50 units towards the
operator. A 3D model drawing as if resting on the surface of a monitor is
shown in Fig. 1.21 .
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