Comp Sci Draw Longitude Lines of a Sphere on a Circle

Thread starter Bking592
Start date Aug 24, 2022
Tags

Circle Lines Longitude Sphere

AI Thread Summary

To draw longitude lines on a 2D globe, it's essential to understand that they will appear as half-ellipses due to the projection method used. The Mercator projection is a common choice for this purpose, but other projections may also be considered depending on the desired visual representation. Techniques for drawing ellipses are crucial for accurately depicting these lines. Exploring various projection methods can enhance the overall design of the globe. Understanding these concepts will aid in creating a more accurate 2D representation of a sphere.

Aug 24, 2022

Bking592

Homework Statement: Find formula for putting curve to put longitude lines of the 2D circle

Relevant Equations: None

I'm trying to draw a 2D globe

Physics news on Phys.org

Aug 24, 2022

berkeman

Admin

Welcome to PF.

What can you tell us about Mercator's projection? Are there any other projections that you could consider using?

Aug 24, 2022

Baluncore

Science Advisor

The lines of longitude will look like half-ellipses on the face of the 2D globe.
You need to find out how to draw an ellipse.

Thread 'Have I solved this structural engineering equation correctly?'

Hi all, I have a structural engineering book from 1979. I am trying to follow it as best as I can. I have come to a formula that calculates the rotations in radians at the rigid joint that requires an iterative procedure. This equation comes in the form of: $$ x_i = \frac {Q_ih_i + Q_{i+1}h_{i+1}}{4K} + \frac {C}{K}x_{i-1} + \frac {C}{K}x_{i+1} $$ Where: ## Q ## is the horizontal storey shear ## h ## is the storey height ## K = (6G_i + C_i + C_{i+1}) ## ## G = \frac {I_g}{h} ## ## C...

View full post »