This is the first part of the source code. You can download it as a zip or clone/download the Github repository. This project consists of a single Python file called polarplots.py.
We then plot the point at the current angle from the origin 0,0, at the current distance r from that origin. To draw a polar plot we therefore need to iterate between two angles (for example 0° to 360°) and calculate the corresponding value of r for each angle. (θ is the Greek letter theta, generally used to denote an angle.) Where r is the radius, or distance from the origin at 0,0, and θ is the angle. Each point x,y is then plotted on the graph.Ī polar plot works in a very different way, and plots functions in the form The above was drawn by iterating x from -10 to 10, and for each value of x calculating the corresponding value of y. You are probably familiar with plotting functions on a Cartesian Plane, where for every point on the horizontal x-axis you can calculate a corresponding coordinate on the y-axis using a function of the form: You can find the full documentation at although I will only be using a small subset of the library's functionality here. You can also capture keyboard and mouse events so can write interactive applications. You can change the pen colour, tell the turtle to lift up the pen to go to another part of the screen without drawing a line, draw text in a font of your choice and so on. The idea is simple - you control a turtle holding a pen, using various functions to make him run around the screen, drawing as he goes.
This is Python's own Tkinter-based implementation of Turtle Graphics, the concept of which dates right back to 1966 and the Logo programming language. If you look down the list of Python standard libraries you might spot one with the mysterious name of turtle. In this post I will write functions to draw polar plots using the Turtle Graphics library which comes as part of the Python Standard Library.
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