Python Functions Basics

Functions Basics

• A function's body should be indented by 4 spaces
• Function parameters can be of different types: numbers, strings, booleans
• Functions can be called multiple times
• Python has rules for legal function names: must start with letters, can contain digits, cannot contain spaces, newlines, or punctuation
• Good function names are short, clear, and camelCased

Function Parameters and Arguments

• Parameters and arguments must match in number and order
• When calling a function with no parameters, use parentheses

Mouse Events

• The onMousePress(mouseX, mouseY) function is called every time the canvas is clicked
• The function name must match the exact name
• Parameter names can be chosen freely, but represent the x and y coordinates of the mouse press on the canvas

Using and Debugging Events

• Use print to understand and debug code
• Print statements should be removed when no longer needed
• Use the control or ctrl key to access the inspector

Top-Level Code

• Any code not inside a function is top-level code
• Runs exactly once before any event is called

Math Operations

• Use + to add, - to subtract, * to multiply, / to divide

Globals

• To modify a shape after creation, store it in a global variable
• Get and set shape properties in any function

Mouse Release Events

• The onMouseRelease(mouseX, mouseY) function is called every time the mouse is released
• Often used to modify existing shapes

Shape Properties

• General shape properties include: position, size, alignment, fill, border, and more
• Properties can be gotten and set
• Default values are provided for each property

Shape-Specific Properties

• Circle: radius
• RegularPolygon: radius, points
• Star: radius, points, roundness
• Line: x1, y1, x2, y2, dashes, lineWidth
• Label: value, font, size, bold, italic
• App background: app.background