fjenett

// which part of the screen is my mouse in?
 
int grid;
 
void setup ()
{
    size( 500, 500 );
    grid = 3;
}
 

fjenett

// dashed and dotted lines in Processing
// by Josh Nimoy, Based on Bresenham
 
void dashedLine ( float x0, float y0, float x1, float y1 )
{
    dashedLine( (int)x0, (int)y0, (int)x1, (int)y1 );
}
 
void dashedLine ( int x0, int y0, int x1, int y1 )
{

fjenett

// quickly find out if an int is even or uneven with:
// (i & 1) == 0
// ... which "extracts" the last bit.
 
for ( int i = 0; i < 10; i++ )
    println( i + " " + (i & 1) + ( (i & 1) == 0 ? " even" : " uneven" ) );

fjenett

// simple line algorithm to draw / read along a line.
//
 
// assumes x1 < x2 and y1 < y2
int x1=10,x2=100;
int y1=20,y2=40;
 
// assumes xdiff > ydiff
float xdiff = x2-x1;
float ydiff = y2-y1;

fjenett

// simple-trace pixel-images
//
 
 
 
int w2,h2;
 
int[] values;
int[][] pairs;
 

fjenett

// extracting single channels from Processings color type
// 

color c = color( 123, 234, 95, 125 );  // this is: color ( red, green, blue, alpha )
 
println( "Color in Hex:\t0x" + Integer.toHexString( c ).toUpperCase() );
 
int alpha = ( c >> 24 ) & 0xFF;
int red   = ( c >> 16 ) & 0xFF;
int green = ( c >> 8 )  & 0xFF;

fjenett

// benchmark to see if right-shift is faster than floor( / ).
// this is to quickly find which grid-element a location belongs to.
// test is in 1D only.
 
void draw ()
{
    //setup
    int grid = 3;
    float gridP = pow(2,grid);  // 16 >> 4 == 16 / 2^4
    

fjenett

// manually setting the window (frame) title in Processing


void setup() 
{
   size( 200, 200 );  // needs to be first!

   if ( this.frame != null ) 
      this.frame.setTitle( "my funky title" );
}

fjenett

// benchmark different sqrt implementations


void setup ()
{
    int runs = 100000;
    
    long ts = System.currentTimeMillis();
    for ( int i=0; i < runs; i++ )
    {

fjenett

// gradient fill using PImage and texture()

Gradient gradient;
 
void setup () 
{
    size(100, 100, P3D);      // needs to be P3D / OPENGL since we use texture()
    
    // create a Gradient size 100 x 100 px with two colors
    gradient = new Gradient( 100, 100, 0xFF880000, 0xFFFFFFFF );