18-5. 2D Coordinates - RELATIVE polar

In the picture bellow you see what it looks like the drawing coordinate system with RELATIVE POLAR COORDINATES.

Relative polar coordinates of the points that are located at some distance from the point where you currently are at an angle and have a certain distance from the previous point.

Coordinate system in AutoCAD

When working with relative polar coordinates it is important to note that the same as when working with rectangular coordinates relative. An additional difference is that in dealing with polar coordinates
relative order starting with the @ sign and then entered the distance from the point where we are and the angle at which the new item will be away.

IMPORTANT! Remember that in working with polar coordinates relative always moves from the origin point where you are regardless of the UCS. Thoroughly study the coordinate system

While entering the coordinates of the first to show distance from the point where you are and then the
angle that will be located that point away, they are separated by less than sign "<".

Before drawing must run the command that we want to draw a line or polyline, etc. .. and then enter the @ sign and then the distance from the point of departure and the angle at which it will reside. (@
distance < angle)

Command: LINE [command line]
Specify first point: 10,10 [set the starting point of art - the absolute coordinates, the distance X = 10 and Y = 10]
Specify next point or [Undo]: @ 8 <45 [is at point 1 and write the distance to point 2 at an angle 45 °] Specify next point or [Undo]: @ 10 <0 [is at point 2 and write the distance to point 3 at an angle 0 °] Specify next point or [Close / Undo]: @ 5 <90 [is at point 3 and write the distance to point 4 at an angle 90 °]
Specify next point or [Close / Undo]: @ 15 <180 [is at point 4 and write the distance to point 5 at an angle 180 °]
Specify next point or [Close / Undo]: @ 8 <235 (or @ 8 <-125 °) [is at point 5 and write the distance to the point 6 at an angle 235 °, but we will not go wrong if the corner entering the minus sign - 125,
as 235 135 = 360 °]
Specify next point or [Close / Undo]: ESCAPE




EXAMPLE 1

See an example of the relative polar coordinates. (@ DISTANCE < angle)

Please note, always start from the point where you are.

I want to note that the angle you can write to plus or minus. The PLUS and MINUS angle depends on the Clockwise or Counter Clockwise.

Of course we are in this training set Counter Clockwise direction so that we are under the direction of axis X MINUS

So you can write the angle <135 or < -225 (this is not the same as <225 or < -135) as a starting point
AutoCAD East direction which is 0°, so moving from this starting point.



EXAMPLE 2

Command: LINE
Specify first point: 10,10 (starting point 1)
Specify next point or [Undo]: @ 5 <30 (5 distance from point 1 at an angle 30 °)
Specify next point or [Undo]: @ 5 <-30 (or @ 5 <330) (distance 5 from point 2 at an angle -30 °)
Specify next point or [Close / Undo]: @ 10 <90 (or @ 10 <-270) (distance 10 from point 3 90 ° angle) Specify next point or [Close / Undo]: @ 5 <-150 (or @ 5 <210) (distance from point 4, 5 angle -150 °)
Specify next point or [Close / Undo]: @ 5 <150 (or @ 5 <210) (distance 5 of 5 items at an angle 150 °)
Specify next point or [Close / Undo]: @ 10 <270 (or @ 10 <-90) (distance 10 from point 6 at an angle 270 °)
Specify next point or [Close / Undo]: ESCAPE