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Examples for Processing (BETA) version 91+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know.

Interpolate
by REAS <http://reas.com>

Move the mouse across the screen and the symbol will follow. Between drawing each frame of the animation, the program calculates the difference between the position of the symbol and the cursor. If the distance is larger than 1 pixel, the symbol moves half of the distance from its current position toward the cursor.

Updated 21 August 2002

    
// Interpolate 
// by REAS <http://reas.com> 

float mx; 
float my; 
float delay = 60.0; 
 
void setup() 
{ 
  size(200, 200); 
  noStroke();  
} 
 
void draw() 
{ 
  background( 51 ); 
  
  float dx = mouseX - mx; 
  if(abs(dx) > 1) { 
    mx = mx + dx/delay; 
  } 
  float dy = mouseY - my; 
  if(abs(dy) > 1) { 
    my = my + dy/delay; 
  } 
  
  translate( mx, my ); 
  plus(); 
} 
 
void plus() 
{ 
  int s = 20; 
  int t = 3; 
  
  // Draw the symbol 
  beginShape( POLYGON ); 
  vertex( -t,  s ); 
  vertex(  t,  s ); 
  vertex(  t,  t ); 
  vertex(  s,  t ); 
  vertex(  s, -t ); 
  vertex(  t, -t ); 
  vertex(  t, -s ); 
  vertex( -t, -s ); 
  vertex( -t, -t ); 
  vertex( -s, -t ); 
  vertex( -s,  t ); 
  vertex( -t,  t );  
  endShape(); 
}
 







    
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