// Up It Up!
// inspired by Peter Cho <www.pcho.net> 
// 
color bgc, fgc, fgc2; 
 
float p_x, p_y; 
float p_fx, p_fy; 
float p_v2, p_vx, p_vy; 
float p_a2, p_ax, p_ay; 
float p_mass, p_drag; 
 
void setup() 
{ 
  size(670, 150, P3D); 
  noStroke(); 
  colorMode(RGB, 255); 
  bgc = color(240, 255, 240); 
  fgc = color(180, 220, 255,128); 
  fgc2 = color(160, 200, 250,128); 
  init_particle(.6, .9,  width/2, height/2); 
} 
 
void draw() 
{ 
  background(bgc); 
  pushMatrix(); 
 
  iterate_particle(.15*(-p_x+mouseX), .15*(-p_y+(height-mouseY))); 
 
  translate(width/2, height/2, 0); 
  fill(fgc); 
  drawK(); 
 
  pushMatrix(); 
  translate(0, 0, 1); 
  translate(.75*(p_x-width/2), -.75*(p_y-height/2), 0); 
  translate(.75*(p_x-width/2), -.75*(p_y-height/2), 0); 
  rotateZ(atan2(-(p_y-height/2),(p_x-width/2)) + PI/2); 
  rotateX(PI); 
  rotateZ(-(atan2(-(p_y-height/2),(p_x-width/2)) + PI/2)); 
  
  fill(fgc2); 
  drawK(); 
  popMatrix(); 
 
  translate(0, 0, 2); 
  translate(.75*(p_x-width/2), -.75*(p_y-height/2), 0); 
  rotateZ(atan2(-(p_y-height/2),(p_x-width/2)) + PI/2); 
  fill(bgc); 
  beginShape(QUADS); 
  vertex(-400, 0); 
  vertex(+400, 0); 
  vertex(+400, -400); 
  vertex(-400, -400); 
  endShape(); 
  
  popMatrix(); 
} 
 
void init_particle(float _mass, float _drag, float ox, float oy) 
{ 
  p_x = ox; 
  p_y = oy; 
  p_v2 = 0.0f; 
  p_vx = 0.0f; 
  p_vy = 0.0f; 
  p_a2 = 0.0f; 
  p_ax = 0.0f; 
  p_ay = 0.0f; 
  p_mass = _mass; 
  p_drag = _drag; 
} 
 
void iterate_particle(float fkx, float fky) 
{ 
  // iterate for a single force acting on the particle 
  p_fx = fkx; 
  p_fy = fky; 
  p_a2 = p_fx*p_fx + p_fy*p_fy; 
  if (p_a2 < 0.0000001) return; 
  p_ax = p_fx/p_mass; 
  p_ay = p_fy/p_mass; 
  p_vx += p_ax; 
  p_vy += p_ay; 
  p_v2 = p_vx*p_vx + p_vy*p_vy; 
  if (p_v2 < 0.0000001) return; 
  p_vx *= (1.0 - p_drag); 
  p_vy *= (1.0 - p_drag); 
  p_x += p_vx; 
  p_y += p_vy; 
} 
 
void drawK() 
{ 
  scale(1); 
  translate(-83, +80); 
  beginShape(QUADS); 
 
//u ver1
  vertex(-195, -60, 0); 
  vertex(-197, -140, 0); 
  vertex(-225, -130, 0); 
  vertex(-220, -55, 0); 

   
//u ver2
  vertex(-140, -60, 0); 
  vertex(-131, -135, 0); 
  vertex(-159, -140, 0); 
  vertex(-165, -60, 0); 
  
//u hor
  vertex(-160, -45, 0); 
  vertex(-156, -70, 0); 
  vertex(-205, -70, 0); 
  vertex(-205, -44, 0); 
  
 //p ver
  vertex(-90, -40, 0); 
  vertex(-91, -135, 0); 
  vertex(-115, -130, 0); 
  vertex(-115, -40, 0); 
  
//p hor1
  vertex(-50, -115, 0); 
  vertex(-46, -140, 0); 
  vertex(-105, -140, 0); 
  vertex(-105, -114, 0); 
  
//p ver2
  vertex(-35, -85, 0); 
  vertex(-31, -130, 0); 
  vertex(-59, -130, 0); 
  vertex(-60, -85, 0); 
  
//p hor2
  vertex(-55, -78, 0); 
  vertex(-51, -100, 0); 
  vertex(-100, -100, 0); 
  vertex(-100, -78, 0); 
  
//i ver
  vertex(25, -40, 0); 
  vertex(25, -100, 0); 
  vertex(0, -100, 0); 
  vertex(0, -40, 0); 
  
//i dot
  vertex(28, -110, 0); 
  vertex(28, -135, 0); 
  vertex(2, -135, 0); 
  vertex(2, -110, 0); 
  
//t ver
  vertex(91, -35, 0); 
  vertex(90, -110, 0); 
  vertex(65, -110, 0); 
  vertex(66, -35, 0); 
   
 //t hor
  vertex(45, -109, 0); 
  vertex(45, -135, 0); 
  vertex(115, -136, 0); 
  vertex(115, -110, 0); 
      
//u ver1
  vertex(168, -55, 0); 
  vertex(163, -130, 0); 
  vertex(135, -130, 0); 
  vertex(140, -55, 0);    
     
//u hor
  vertex(155, -39, 0); 
  vertex(155, -65, 0); 
  vertex(210, -65, 0); 
  vertex(210, -39, 0); 
  
//u ver2
  vertex(223, -55, 0); 
  vertex(228, -130, 0); 
  vertex(200, -130, 0); 
  vertex(195, -55, 0);   
        
//p ver1
  vertex(280, -46, 0); 
  vertex(279, -135, 0); 
  vertex(255, -130, 0); 
  vertex(255, -48, 0);                
               
//p hor1
  vertex(320, -115, 0); 
  vertex(324, -140, 0); 
  vertex(265, -140, 0); 
  vertex(265, -114, 0); 
   
//p ver2
  vertex(335, -85, 0); 
  vertex(339, -130, 0); 
  vertex(311, -130, 0); 
  vertex(310, -85, 0);                   
  
//p hor2
  vertex(315, -78, 0); 
  vertex(319, -100, 0); 
  vertex(270, -100, 0); 
  vertex(270, -78, 0);                                
  
//X ver1
  vertex(380, -65, 0); 
  vertex(389, -135, 0); 
  vertex(360, -140, 0); 
  vertex(355, -65, 0); 
      
//X dot
  vertex(377, -55, 0); 
  vertex(377, -35, 0); 
  vertex(352, -35, 0); 
  vertex(352, -55, 0); 
                                                                                                                                            
                                                                                             
  /*vertex(37.1992, -87.9990, 0); 
  vertex(84.1987, -142.7979, 0); 
  vertex(130.3979, -142.7979, 0); 
  vertex(37.1992, -43.999, 0); 
 
  vertex(77.5986-.2, -86.5986-.3, 0); 
  vertex(136.998, 0, 0); 
  vertex(90.7988, 0, 0); 
  vertex(52.3994-.2, -59.999-.3, 0); 
  */
  endShape(); 
  translate(+83, -81); 
}