CoMo Science

Tag: coding

  • Converting HEIC to PNG

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    I discuss the problem of converting HEIC image files to PNG and explain two solutions: manual conversion and writing a Python program using Pillow-HEIF. I share my Python code and discuss the installation and features of the pillow-heif package.

  • Server-side vs. client-side

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    As you are learning HTML, JavaScript and CSS, you are going to realize that there are things that webpages do, that you can’t do with HTML, JS or CSS. At that point, it is time to understand the server-side vs. client-side of the web. All of the web development you have been doing so far,…

  • Writing more complex code

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    When you first start learning to program, you are often motivated by a desire to create a specific program, like a game. But writing larger programs can be frustrating due to the number of errors and your lack of progress. I discuss how to develop you code step-by-step in order to achieve early success and…

  • If statements

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    In JavaScript, if statements are written like this: This is one of the main ways that we use to get a program to make a decision based on input and do something different than it would otherwise do. When the program reaches the if statement, it will determine if the condition is true or false.…

  • Troubleshooting your webpage

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    This code troubleshooting guide emphasizes the importance of clear formatting, comments, and variable names. It also highlights common HTML and JavaScript errors to watch out for and suggests using the browser console for error messages and variable value checks. Proper formatting and console usage can greatly facilitate code troubleshooting.

  • setInterval()

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    setInterval is a JavaScript command which takes two parameters. The first is the name of a function and the second is the time interval, in milliseconds, that this function should be repeatedly called. For example: In this code, setInterval calls the function ‘update’ every 10 milliseconds. The function increases the variable i by 1 and…

  • Arrays

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    An array in JavaScript is a variable containing multiple values. Arrays are indexed from 0 to n-1. By using a for loop, you can iterate through the array’s values without needing to list each value individually. Proper formatting makes an array’s structure easier to understand. Arrays are fundamental in JavaScript programming.

  • G-code

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    What is G-code? G-code is the most widely used CNC and 3D printing programming language. It is used to provide commands for controlling the movement of tools as well as controlling the temperature of the 3D printer. The discussion below will focus mostly on using G-code for 3D printing. Syntax Each line of G-code contains…

  • Spirographs 3

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    This is the third in a multi-part series on spirographs. It might be helpful to review part 1 and part 2 first. Review In the first two parts, I discussed the parametric equations for drawing a spirograph and rewrote these equations using coefficients that can vary independently to adjust the size of the design, the…

  • Spirographs 2

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    This is part 2 of a multi-part series. If you haven’t read the first part, it may be helpful to review it first. The problem with the standard formulas The standard formula for an epitrochoid is: The problem with this formula is that adjusting r or d to form new designs changes the overall size…