• Adobe After Effects Expressions

  expression help: bounce to final position

  Posted by Gabrielle Dainard on May 26, 2016 at 1:50 pm

  hello,
  i am trying to bounce multiple copies of a logo off the sides of my comp for 3 seconds then they all land in the center of my screen.
  i have found two expressions that work as i need them to but i dont know how to combine them.

  LOGO BOUNCE:

  left = 0;
  top = 1070;
  right = thisComp.width;
  bottom = thisComp.height;

  minSpeed = 800; //pixels per second
  maxSpeed = 100;

  minX = left + 20;
  maxX = right – 20;
  minY = top + 0;
  maxY = bottom – 20;

  minR = 5;
  maxR = 85;

  seedRandom(index,true);

  // calc start position

  pos = random([minX,minY],[maxX,maxY])
  quadrent = Math.floor(random(4))*90;
  angle = random(minR,maxR) + quadrent;
  spd = random(minSpeed,maxSpeed);

  // initialize time count;

  t = 0;

  while(t <= time){
  rads = degreesToRadians(angle);
  xVel = spd*Math.cos(rads);
  yVel = spd*Math.sin(rads);

  // see if going up or down

  if (yVel < 0) yLim = top else yLim = bottom;

  // see if going right or left

  if (xVel < 0) xLim = left else xLim = right;

  timeX = (xLim – pos[0])/xVel;
  timeY = (yLim – pos[1])/yVel;

  if (timeX < timeY){ //hit left or right wall
  if (t + timeX >= time){
  deltaT = time – t;
  pos += [xVel,yVel]*deltaT;
  break;
  }else{
  pos = [xLim,pos[1] + yVel*timeX];
  angle = 180 – angle;
  t += timeX;
  }
  }else{ //hit upper or lower wall
  if (t + timeY >= time){
  deltaT = time – t;
  pos += [xVel,yVel]*deltaT;
  break;
  }else{
  pos = [pos[0] + xVel*timeY,yLim];
  angle = 360 – angle;
  t += timeY;
  }
  }
  }
  pos

  FINAL POSITION

  moveDur = .5;
  seedRandom(index,true);
  startPos = random([thisComp.width,thisComp.height]);
  ease(time,inPoint,inPoint+moveDur,startPos,value)

  if anyone has any feedback for me that would be amazing!!

  thank you in adcance

  <b>LOGO BOUNCE:</b>

  left = 0;
  top = 1070;
  right = thisComp.width;
  bottom = thisComp.height;

  minSpeed = 800; //pixels per second
  maxSpeed = 100;

  minX = left + 20;
  maxX = right - 20;
  minY = top + 0;
  maxY = bottom - 20;

  minR = 5;
  maxR = 85;

  seedRandom(index,true);

  // calc start position

  pos = random([minX,minY],[maxX,maxY])
  quadrent = Math.floor(random(4))*90;
  angle = random(minR,maxR) + quadrent;
  spd = random(minSpeed,maxSpeed);

  // initialize time count;

  t = 0;

  while(t &lt;= time){
  rads = degreesToRadians(angle);
  xVel = spd*Math.cos(rads);
  yVel = spd*Math.sin(rads);

  // see if going up or down

  if (yVel &lt; 0) yLim = top else yLim = bottom;

  // see if going right or left

  if (xVel &lt; 0) xLim = left else xLim = right;

  timeX = (xLim - pos[0])/xVel;
  timeY = (yLim - pos[1])/yVel;

  if (timeX &lt; timeY){ //hit left or right wall
  if (t + timeX >= time){
  deltaT = time - t;
  pos += [xVel,yVel]*deltaT;
  break;
  }else{
  pos = [xLim,pos[1] + yVel*timeX];
  angle = 180 - angle;
  t += timeX;
  }
  }else{ //hit upper or lower wall
  if (t + timeY >= time){
  deltaT = time - t;
  pos += [xVel,yVel]*deltaT;
  break;
  }else{
  pos = [pos[0] + xVel*timeY,yLim];
  angle = 360 - angle;
  t += timeY;
  }
  }
  }
  pos

  <b>FINAL POSITION</b>

  moveDur = .5;
seedRandom(index,true);
startPos = random([thisComp.width,thisComp.height]);
ease(time,inPoint,inPoint+moveDur,startPos,value)

  Gabrielle Dainard replied 10 years, 3 months ago 1 Member · 0 Replies
• 0 Replies

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