Research on If/Else 1st

Link -http://www.openprocessing.org/visuals/?visualID=3148

 

if( mousePressed )     {       PVector dir = new PVector( mouseX, mouseY, -500 );       dir.sub( loc );       dir.normalize();       speed.add( dir );     }     else     {       speed.mult( .9 );     }     loc.add( speed );     pushMatrix();     translate( loc.x, loc.y, loc.z );     rotateToFace( loc );        beginShape( QUADS );     vertex( -size, -size, 0 );     vertex( size, -size, 0 );     vertex( size, size, 0 );     vertex( -size, size, 0 );     endShape();     popMatrix();