Processing variables
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Processing Variables. Variables. Processing gives us several variables to play with These variables are always being updated and you can assume they have the right value Watch your spelling!. Mouse Location. mouseX tells the X location of the mouse mouseY tells the Y location of the mouse.

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Variables
Variables

  • Processing gives us several variables to play with

  • These variables are always being updated and you can assume they have the right value

  • Watch your spelling!


Mouse location
Mouse Location

  • mouseX tells the X location of the mouse

  • mouseY tells the Y location of the mouse


Window properties
Window Properties

  • width tells the width of the window currently (even if you resize)

  • height tells the current height of the window

height

width


What can you do with that
What can you do with that?

  • Draw a circle that follows the mouse:

    • ellipse(mouseX, mouseY, 20, 20);

  • Draw a rectangle (60x40) centered around the mouse:

    • rect(mouseX-30, mouseY-20, 60,40);

  • Draw a box, centered, exactly ½ the size of the window:

    • rectMode(CENTER);

    • rect(width/2, height/2, width/2, height/2);


Coding with methods
Coding with methods

  • Notice the “chunks” of code, like setup and draw:

    public void draw(){

    <- Code goes in here.

    }


Coding with methods1
Coding with methods

  • Notice the “chunks” of code, like setup and draw:

    public void draw(){

    <- Code goes in here.

    }

    We can make our own:

    public void drawEyes(){

    ellipse(50,50,10,10);

    ellipse(20,50,10,10);

    }


Coding with methods2
Coding with methods

  • Notice the “chunks” of code, like setup and draw:

    public void draw(){

    drawEyes(); Now call the method in

    } the draw() section.

    We can make our own:

    public void drawEyes(){

    ellipse(50,50,10,10);

    ellipse(20,50,10,10);

    }


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