G02 draw circle

[Farzaneh_2010]

hello
sorry.my English is very weak i hope that you understand my message
i am trying to write a program g-code with delphi
but i have problems about G02 and draw a circle becuse i can not use Arc
and i had to draw a circle with lines.please help me to find a solution for this
problem.how draw line and what kind of parameters i need?
please help me

[praneshkumarpj]

Hi
In order to draw a circle using lines consider the equation of the circle X^2+Y^2 = R^2
You know the radius of the circle. Consider a point on circle. Let it be (X1,Y1).

Now increment the X1 value to X2 = X1+0.01 and calculate the corresponding Y2 value from equation Y2 = squareroot(R^2 - X2^2).

Iterate the process by incrementing the X value to 0.01 until Xn = X1 + 2R.

So now u will get a set points and by joining those points you will get a semicircle.

Proceed in the reverse way i.e. from Xn to X1 to get the other semicircle.

[Farzaneh_2010]

Originally Posted by praneshkumarpj Hi In order to draw a circle using lines consider the equation of the circle X^2+Y^2 = R^2 You know the radius of the circle. Consider a point on circle. Let it be (X1,Y1). Now increment the X1 value to X2 = X1+0.01 and calculate the corresponding Y2 value from equation Y2 = squareroot(R^2 - X2^2). Iterate the process by incrementing the X value to 0.01 until Xn = X1 + 2R. So now u will get a set points and by joining those points you will get a semicircle. Proceed in the reverse way i.e. from Xn to X1 to get the other semicircle.

Thankyou
u mean the new equation of the circle is x2^2+y2^2=R2^2
but i want to write this equation in delphi or other programming langauge.for
example in delphi it write by lineto(x,y)
so how i can write it?

[samu]

i dont think it is a good idea to set a linear increment, cause it is a trigonometric function. With a linear increment, acuracy won't be the same all aroud the circle.Instead, use an angular increment.

A=Angle
R=radius
I=increment

Do this loop while A is less that the value you want to reach
X=cosA*R
y=sinA*R
lineto(x,y)
A=A+I

[sinha_nsit]

Right.

[praneshkumarpj]

Originally Posted by Farzaneh_2010 Thankyou u mean the new equation of the circle is x2^2+y2^2=R2^2 but i want to write this equation in delphi or other programming langauge.for example in delphi it write by lineto(x,y) so how i can write it?

you have to iterate the equation several times and use the numeric values arrived from the equation