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Introduction to Java & Processing: Programming Basics and Graphics Fundamentals

Explore the fundamentals of programming in Java, focusing on problem-solving and executing commands. Learn how to handle errors, write efficient code, and create engaging graphics using the Processing library.

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Introduction to Java & Processing: Programming Basics and Graphics Fundamentals

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Presentation Transcript

  1. Intro to Java & Processing

  2. Review • CS is about problem-solving • To write programs you must • Be able to solve the problem yourself • Be able to describe the solution to another • Be able to describe the solution to the computer (programming)

  3. Programming • Programs: how to tell a computer what to do • Each line is a command to the computer • The computer is stupid, so you have to type everything in exactly • If you make a mistake, you get an error and have to fix it • In this class, we use a programming language called Java • Java is called an Object-Oriented language

  4. About Programming • Java is Case-SENsITivE! • Punctuation matters • Spelling matters • File names matter • Spaces don’t matter much • Be careful! • Follow the examples…

  5. The tool… • IDE: Integrated Development Environment • A Program that does it all together, and it’s PRETTY… • One IDE is Eclipse

  6. Fun with Graphics • We use a Java library called Processing that makes graphics easy. • Just open a new Processing project and check out the src folder. • Pixels! • Color (RGB, 0-255, Additive model, think LIGHT!) • x,y value

  7. Computer Graphics

  8. How it works • 2 sections: setup & draw • Setup: stuff that happens when the window opens (once) • Draw: stuff that happens many times a second

  9. Processing commands • background(255,0,0); • size(800,450);

  10. Shapes • triangle(Ax,Ay,Bx,By,Cx,Cy); • rect(ULx, ULy, w, h); • ellipse(Cx,Cy,w,h); • What’s the difference in putting these in setup() vs draw()? Try it. • What’s the difference between drawing a rectangle then a triangle or the triangle then a rectangle? Try it.

  11. Circles & Arcs • Angles done in radians & clockwise • You must put the smaller number before the larger number. AddTWO_PI if you need to to get a bigger number.

  12. Shape Attributes • fill(R,G,B); • stroke(R,G,B); • noFill(); • noStroke(); • strokeWeight(n);

  13. Comments • Don’t do too much without comments! • // - one line comment • /* • paragraph */

  14. ERROR!! • Sometimes it just doesn’t work… • Types of errors: • Compiler error • No semicolon • public Class Program{ • Logic error • answer = 2+3; • “The anser is “ • Fatal or Runtime error • answer = 2/0;

  15. And then what? • Fix the program, save it, recompile, re-execute until everything works • The error is often called a “bug” • Fixing it is called debugging

  16. There’s lots more… • You get a cheat sheet and the API!

  17. PW0 • Make a face • Turn it in

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