Posted by sunggus on Jul 22, 2018; 4:53am
URL: https://forum.librecad.org/Confusing-about-Specify-point-on-circle-on-LibreCAD-2-2-0-RC1-tp5716234p5716240.html

Hi Armin,

Thank you for your reply.

Let me tell that my intention to post this "complaint" is not because I don't like LibreCAD, but it is because I like it. I love it. This is my way to give feedback for development. I have AutoCAD 2007 installed in my computer so do QCAD. But I want to leave them.

Here is your comment:
For the "Center, Point" tool the earlier text was about to enter radius, what was also confusing, as you need to enter a coordinate to specify the circle radius and not the distance from center. So we finally ended with "Specify point on circle", which at least is the radius, as every point on the circle has the distance of radius from center.

Here is my drawing. I am designing simple machine for agriculture. As you see, there are many circles in it.  As you see in my second picture, there are many things there. They are pulleys with different types and size, nuts with different size, axles with different size too, bearing with different type and size, and many more, include my Lucky Strike circle . What I know from a circle is its diameter or radius and the thickness for real 3D part drawing. As you may imagine, when we try to draw even one pulley, will be many circle we draw. In this case, include it bore size.

To apply these parts/components to a real drawing (in the case of 2D drawing), we point where the circle (the parts in this case) we will be put. Normally, I don't know what the coordinates I will put. And in most cases, I put it at the end of a line as it is normally in real machine. Or even I have to draw a helping line, either it just a single line or a cross line, to help me to put the circle center. I never ask what is the coordinate of that point (even I understand that sometimes that way also required). And I believe it is the way to draw.

To do that purpose, I work with (Center, Point). But as you mentioned there is another (Center, Radius), I have tried it. Unfortunately, in my LC 2.2.0 RC1, I don't know what to do with it. When I chosed that tool (Center, Radius) from the tool menu, it asks "specify circle center". When I click one point in the grid, than it drew a very small circle and no more I can do with it. It is finished. It was not asking the radius. Is it possible that my LC is error?

Must be considered which one is more common or more frequently used. Is that point a center and enter the radius or point a center and enter a point as radius? I do confuse with the logic here. But if the (Center, Radius) is the way to make it work as I experience with LC 2.1.3, probably the (Center, Radius) need to put it in the first option.

From your explanation, I now use relative coordinate. I used @(radius)<0 for just complying requirement. But we should not bother our mind with angle as circle is 360 degree.