Coordinate systems

 

Coordinate system is a system where position of points and other objects is uniquely represented in decimal numbers called coordinates.

Cartesian coordinate system is used in BabaCAD for determining position of points. Coordinate center is in the lower left part part of the screen, but it can be positioned on some other place if needed. Based on the interpretation form of this data, there are two different systems: cartesian and polar coordinate systems.

 

Cartesian coordinate system

Position of point in Cartesian coordinate system is represented by it's distance from the coordinate center, measured by direction of coordinate axis. Point data is entered in form of X, Y coordinate expression where comma is used to separate X and Y value, while dot is used as the marker of decimal place.

 

Polar coordinate system

Polar coordinates determine position of a point by it's distance from coordinate center and the angle it's direction makes with the positive direction of X axis. Angle is measured in counter clockwise direction.

 

Apsolute coordinates

Usage of absolute coordinate system takes known values always expressed relative to coordinate center (point with the coordinate 0.000,0.000).

All points in BabaCAD are entered as absolute coordite. Format of writing X, Y coordinates can be like in the following examples:

X coordinate	Y coordinate	Format of X,Y coordinates
20	30	20,30
3.5	20.0	3.5,20.0
41.435633	80.039482	41.435633,80.039482

 

Relative coordinates

Relative coordinates are used when we want to position a new point, with known distance from the previously entered point (whilst the distance of absolute coordinates is measured from the coordinate center).