Processing Variables

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# Processing Variables - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Processing Variables' - amanda

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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
Mouse Location
• mouseX tells the X location of the mouse
• mouseY tells the Y location of the mouse
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?
• 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
• Notice the “chunks” of code, like setup and draw:

public void draw(){

<- Code goes in here.

}

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 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);

}