book

Getting Started with p5.js

by Lauren McCarthy, Casey Reas, Ben Fry

October 2015

Beginner

246 pages

4h 6m

English

Make: Community

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Preface
How This Book Is OrganizedWho This Book Is ForConventions Used in This BookUsing Code ExamplesSafari® Books OnlineHow to Contact UsAcknowledgments
1. Hello
Sketching and PrototypingFlexibilityGiantsFamily TreeJoin In
2. Starting to Code
EnvironmentDownload and File SetupYour First ProgramExample 2-1: Draw an EllipseExample 2-2: Make CirclesThe ConsoleMaking a New ProjectExamples and Reference
3. Draw
The CanvasExample 3-1: Create a CanvasExample 3-2: Draw a PointBasic ShapesExample 3-3: Draw a LineExample 3-4: Draw Basic ShapesExample 3-5: Draw a RectangleExample 3-6: Draw an EllipseExample 3-7: Draw Part of an EllipseExample 3-8: Draw with DegreesExample 3-9: Use angleModeDrawing OrderExample 3-10: Control Your Drawing OrderExample 3-11: Put It in ReverseShape PropertiesExample 3-12: Set Stroke WeightExample 3-13: Set Stroke AttributesColorExample 3-14: Paint with GraysExample 3-15: Control Fill and StrokeExample 3-16: Draw with ColorExample 3-17: Set TransparencyCustom ShapesExample 3-18: Draw an ArrowExample 3-19: Close the GapExample 3-20: Create Some CreaturesCommentsRobot 1: Draw
4. Variables
First VariablesExample 4-1: Reuse the Same ValuesExample 4-2: Change ValuesMaking Variablesp5.js VariablesExample 4-3: Adjust the Canvas, See What FollowsA Little MathExample 4-4: Basic ArithmeticRepetitionExample 4-5: Do the Same Thing Over and OverExample 4-6: Use a for LoopExample 4-7: Flex Your for Loop’s MusclesExample 4-8: Fanning Out the LinesExample 4-9: Kinking the LinesExample 4-10: Embed One for Loop in AnotherExample 4-11: Rows and ColumnsExample 4-12: Pins and LinesExample 4-13: Halftone DotsRobot 2: Variables
5. Response
Once and ForeverExample 5-1: The draw() FunctionExample 5-2: The setup() FunctionExample 5-3: setup(), Meet draw()FollowExample 5-4: Track the MouseExample 5-5: The Dot Follows YouExample 5-6: Draw ContinuouslyExample 5-7: Set Thickness on the FlyExample 5-8: Easing Does ItExample 5-9: Smooth Lines with EasingClickExample 5-10: Click the MouseExample 5-11: Detect When Not ClickedExample 5-12: Multiple Mouse ButtonsLocationExample 5-13: Find the CursorExample 5-14: The Bounds of a CircleExample 5-15: The Bounds of a RectangleTypeExample 5-16: Tap a KeyExample 5-17: Draw Some LettersExample 5-18: Check for Specific KeysExample 5-19: Move with Arrow KeysTouchExample 5-20: Touch the ScreenExample 5-21: Track the FingerMapExample 5-22: Map Values to a RangeExample 5-23: Map with the map() FunctionRobot 3: Response
6. Translate, Rotate, Scale
TranslateExample 6-1: Translating LocationExample 6-2: Multiple TranslationsRotateExample 6-3: Corner RotationExample 6-4: Center RotationExample 6-5: Translation, Then RotationExample 6-6: Rotation, Then TranslationExample 6-7: An Articulating ArmScaleExample 6-8: ScalingExample 6-9: Keeping Strokes ConsistentPush and PopExample 6-10: Isolating TransformationsRobot 4: Translate, Rotate, Scale
7. Media
ImagesExample 7-1: Load an ImageExample 7-2: Load More ImagesExample 7-3: Mousing Around with ImagesExample 7-4: Transparency with a GIFExample 7-5: Transparency with a PNGExample 7-6: Displaying an SVG ImageAsynchronicityExample 7-7: Demonstrating AsynchronicityExample 7-8: Loading with a CallbackFontsExample 7-9: Drawing with FontsExample 7-10: Use a WebfontExample 7-11: Load a Custom FontExample 7-12: Set the Text Stroke and FillExample 7-13: Draw Text in a BoxExample 7-13: Store Text in a VariableRobot 5: Media
8. Motion
FramesExample 8-1: See the Frame RateExample 8-2: Set the Frame RateSpeed and DirectionExample 8-3: Move a ShapeExample 8-4: Wrap AroundExample 8-5: Bounce Off the WallTweeningExample 8-6: Calculate Tween PositionsRandomExample 8-7: Generate Random ValuesExample 8-8: Draw RandomlyExample 8-9: Move Shapes RandomlyTimersExample 8-10: Time PassesExample 8-11: Triggering Timed EventsCircularExample 8-12: Sine Wave ValuesExample 8-13: Sine Wave MovementExample 8-14: Circular MotionExample 8-15: SpiralsRobot 6: Motion
9. Functions
Function BasicsExample 9-1: Roll the DiceExample 9-2: Another Way to RollMake a FunctionExample 9-3: Draw the OwlExample 9-4: Two’s CompanyExample 9-5: An Owl FunctionExample 9-6: Increasing the Surplus PopulationExample 9-7: Owls of Different SizesReturn ValuesExample 9-8: Return a ValueRobot 7: Functions

10. Objects
Properties and MethodsDefine a ConstructorCreate ObjectsExample 10-1: Make an ObjectExample 10-2: Make Multiple ObjectsRobot 8: Objects
11. Arrays
From Variables to ArraysExample 11-1: Many VariablesExample 11-2: Too Many VariablesExample 11-3: Arrays, Not VariablesMake an ArrayExample 11-4: Declare and Assign an ArrayExample 11-5: Assigning to an Array in One GoExample 11-6: Revisiting the First ExampleRepetition and ArraysExample 11-7: Filling an Array in a for LoopExample 11-8: Track Mouse MovementsArrays of ObjectsExample 11-9: Managing Many ObjectsExample 11-10: Sequences of ImagesRobot 9: Arrays
12. Data
Data SummaryTablesExample 12-1: Read the TableExample 12-2: Draw the TableExample 12-3: 29,740 CitiesJSONExample 12-4: Read a JSON FileExample 12-5: Visualize Data from a JSON FileNetwork Data and APIsExample 12-6: Parsing the Weather DataExample 12-7: Chaining MethodsRobot 10: Data
13. Extend
p5.soundExample 13-1: Play a SampleExample 13-2: Listen to a MicExample 13-3: Create a Sine Wavep5.domExample 13-4: Access the WebcamExample 13-5: Create a SliderExample 13-6: Create an Input Box
A. Coding Tips
Functions and ParametersCommentsUppercase and LowercaseStyleConsoleOne Step at a Time
B. Order of Operations
C. Variable Scope
Index

Content preview from Getting Started with p5.js

Chapter 11. Arrays

An array is a list of variables that share a common name. Arrays are useful because they make it possible to work with more variables without creating a new name for each one. This makes the code shorter, easier to read, and more convenient to update.

From Variables to Arrays

When a program needs to keep track of one or two things, it’s not necessary to use an array. In fact, adding an array might make the program more complicated than necessary. However, when a program has many elements (for example, a field of stars in a space game or multiple data points in a visualization), arrays make the code easier to write.

Example 11-1: Many Variables

To see what we mean, refer to Example 8-3. This code works fine if we’re moving ...

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