CS1335 Java and Processing
  • CS 1335 Computer Science 1
  • Getting Started
    • Processing IDE
    • Java vs Javascript
    • Review: Processing, Functions
    • HSB Color Mode
      • HSB Color Wheel
        • Example Code
      • HSB Color Palette Tool
    • Recursion
      • Recursion Call-Stack
      • Example Code
        • Example Code Feb 5 S20
        • Feb 12 Code
  • Project 1
    • Subjective Modeling of Emotions
    • Emotions represented using color, form, space
      • Kandinsky Color - Emotion
      • Emotional Intelligence
    • Project 1: PShapes
      • Example Code
      • Inspiration
    • PShape with Cutout - Inner Contour
    • VertexShape - Recursion
    • Project 1: Recursive Drawing
    • Project 1: Programmatic Variations in Color
      • Recursion with rotate, scale
      • Plan Region Size, Color
    • Map Function
    • Transforms for Mirroring
    • Project1-Steps
  • Grid Based Designs
    • Computational Design
      • Generative Design
    • Artist: Victor Vasarely
    • Grid Pattern Design
    • 1D - Array of PShapes for Grid Layout
      • Truchet Tiling
      • Example Code
    • PShapes in Grid Regions
    • Grid Region Logic
    • Pattern Preview - Transforms: Translate & Scale
  • Project 2
    • Project 2 - 2D Arrays for Gradient Logic
      • 2D Array Grid with Labels
    • Grid Patterns using 2D Array Indexes: i, j
      • Example Class Code
    • lerpColor( ) and map( ) Functions
    • Demo Lerp Colors
    • 2D Arrays with lerpColor
    • Create PShape 2D Array
    • Function: Populate2DArray( )
    • Function: DisplayShapeMatrix()
    • Transforms for Position, Rotation, Scale of ShapeMatrix Elements
    • Project 2 - Steps
    • Animation for ShapeMatrix
      • Animation w/Noise
  • Object Oriented Programming
    • Introduction to Objects
    • OOP vs Data-Flow
    • Button States
    • Buttons as Objects
      • Button Class
    • Create Object Instances
    • Button Types
    • Modeling Buttons: States and Events
    • OOP - Inheritance
    • OOP - Polymorphism
    • Child-Class: PImageButton
    • PShape - SVG Objects
    • Menu of Buttons
    • ButtonGroup - Final Version
    • Slider Controller
    • UML Class Diagram
  • Project 3
    • Project 3 - Logic, Steps
    • Example Code S20
      • Code Wed Apr 1
      • Code Wed Apr 8 v1
      • Code Wed Apr 8 v2
      • Code Mon Apr 13
      • Code Wed Apr 15
      • Code Mon Apr 20
      • Code Wed Apr 22
      • Code Mon Apr 27
      • Code Wed Apr 29
    • Project 3 - Class Definitions
      • Button
      • PImageButton
      • ButtonGroup
      • Pattern
        • PShapes - SVG, Vertex Shapes
        • Setting Colors For Patterns
        • Pattern - With Child-PShapes
      • Slider
      • Particles
  • Java Syntax
    • Java Syntax
      • Typed-Variables
      • Float - Integer Conversion Errors
      • Modulus
      • Functions
      • Object Reference Data Types
      • Arrays
        • Class Example Code
      • Switch-Case Statement
      • Ternary Operator
      • Class
      • Learning Science
    • UML Class Diagram
    • Glossary
  • Resources and References
    • Resources
    • Random Inspiration
      • Ulm School
      • Heart-Mind, Mind, Body
      • Statistical Uncertainty
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  • Class Button
  • Main Tab Code - Using Buttons

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  1. Object Oriented Programming
  2. Buttons as Objects

Button Class

Class Button

class Button{
  ///INSTANCE VARIABLES
  float x,y; //position
  float w,h; //size
  boolean selected; //is the button selected / on? true/false
  color selectedColor, defaultColor, currentColor;
  String label; 

  ///CONSTRUCTORS - no return type declared - match Class-name
  Button(float x, float y, float w, float h, String label ){
    this.x = x;
    this.y = y;
    this.w = w;
    this.h = h;
    this.label = label;
    selected = false;
    selectedColor = color( 280, 100, 100); ///must be HSB color
    defaultColor = color( 280, 70, 70); //slightly darker?
    currentColor = defaultColor; 
  }


  ///METHODS
  void display(){
    fill( currentColor);
    rect( x, y, w, h);
    fill( 0);//black for text
    textAlign(CENTER);
    text( label, x + w/2, y + (h/2));
  }

  void clicked( int mx, int my){
    if( mx > x && mx < x + w  && my > y && my < y+h){
      //mouse has been clicked
      selected = !selected;  //toggle the value between true and false
      if( selected){
          currentColor = selectedColor;
      }else{
          currentColor = defaultColor;
      }
    }
  }



}  //end Button class

Main Tab Code - Using Buttons

Button btn1;   //data-type, variable-name   //null
int x;    //data-type, variable-name  //0

///Initialize things - variables
void setup(){
  size( 600, 600);
  colorMode(HSB, 360, 100, 100);
  x= 10; //initialize the variable
  btn1 = new Button( 10, 10, 100, 100, "Press" );  //initialize by calling a Button constructor
}

//makes it a frame-based application
void draw( ){
  btn1.display(); //have the button instance call it's display( ) method
}

//add code for mouseClicked
void mouseClicked( ){
  btn1.clicked( mouseX, mouseY);
}
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Last updated 5 years ago

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