By Allison Parrish
Processing spread out the area of programming to artists, designers, educators, and newcomers. The Processing.py Python implementation of Processing reinterprets it for todays internet. This brief ebook lightly introduces the center ideas of machine programming and dealing with Processing. Written via the co-founders of the Processing venture, Reas and Fry, besides co-author Allison Parrish, Getting all started with Processing.py is your quick music to utilizing Pythons Processing mode.
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Additional resources for Make Getting Started with Processing.py
Functions are the basic building blocks of a Processing program. The behavior of a function is defined by its parameters. For example, almost every Processing program has a size() function to set the width and height of the Display Window. ) 13 Example 3-1: Draw a Window The size() function has two parameters: the first sets the width of the window and the second sets the height. To draw a window that is 800 pixels wide and 600 high, write: size(800, 600) Run this line of code to see the result.
The variable can be used many times within a single program, and the value is easily changed while the program is running. First Variables One of the reasons we use variables is to avoid repeating ourselves in the code. If you are typing the same number more than once, consider making it into a variable to make your code more general and easier to update. Example 4-1: Reuse the Same Values For instance, when you make the y coordinate and diameter for the two circles in this example into variables, the same values are used for each ellipse: size(480, 120) y = 60 d = 80 ellipse(75, y, d, d) ellipse(175, y, d, d) ellipse(275, y, d, d) # Left # Middle # Right 35 Example 4-2: Change Values Simply changing the y and d variables alters all three ellipses: size(480, 120) y = 100 d = 130 ellipse(75, y, d, d) ellipse(175, y, d, d) ellipse(275, y, d, d) # Left # Middle # Right Without the variables, you’d need to change the y coordinate used in the code three times and the diameter six times.
These are discussed in Chapter 5. A Little Math People often assume that math and programming are the same thing. Although knowledge of math can be useful for certain types of coding, basic arithmetic covers the most important parts. 37 Example 4-4: Basic Arithmetic size(480, 120) x = 25 h = 20 y = 25 rect(x, y, 300, h) x = x + 100 rect(x, y + h, 300, h) x = x - 250 rect(x, y + h*2, 300, h) # Top # Middle # Bottom In code, symbols like +, -, and * are called operators. When placed between two values, they create an expression.