What are Absolute coordinates?
Absolute coordinates mean the Cartesian System, which consists of the x-axis, y-axis, and z-axis. This cartesian system measures the distance from the intersection of the x-axis, y-axis, and z-axis called the origin.
The absolute coordinates are then used to specify the object location concerning the origin (0, 0).
Consider the above figure, which represents the two-dimensional cartesian system divided into four quadrants, namely quadrant 1, quadrant 2, quadrant 3, and quadrant 4.
Quadrant 1 contains only the positive axis. Whereas Quadrant 3 contains only a negative axis.
When we consider the below image, the origin is the intersection of both the x and y-axis. It is denoted as "0, 0" points, and the absolute coordinate measured from the origin is "7,6," which is 7 units through the x-axis and 6 units through the y-axis.
The absolute coordinates are useful while giving the data inputs to the CAD program. To draw a line(indicated in blue) as shown in the above image, the user should give input in the form (x, y) form. The x and y values represent the distance of the line, which is x units away from the origin on the X-axis and y units on the Y-axis.
The (1,4) input makes a line 1 unit to the right and four units above from the origin.
When the user wants to draw a shape in a three-dimensional plane, input three values in the format (x, y, z) representing the distance away from the origin in the X, Y, and Z axis, respectively. The point (1,2,3) draws a line 1unit above the X-axis and 2 units right to Y-axis and 3 units from the origin in the Z-axis.
Can absolute coordinates be negative?
In AutoCAD, the location of a point is specified from 0-X, 0-Y, 0-Z(0, 0, 0) point. The absolute coordinates do not include negative dimensions because absolute coordinates include only Quadrant 1 in a cartesian plane. In the AutoCAD software, the absolute coordinates mean only positive values of the axis.
Uses of the absolute coordinates