Random Pan and Scan

You can use these expressions to randomly pan and scan a photo that is larger than your comp.

The expressions will automatically compensate for square pixels in a non-square pixel comp.

Import your image into the comp and add a point control to it.

Add the following expression to the point control:

scaleTime = 1;
holdTime = .5;
maxScale = 50;

minScale = Math.max(thisComp.width/width,thisComp.height/height)*100;
totalTime = scaleTime + holdTime
seed  =Math.floor(time/totalTime) + 2;
seedRandom(seed,true);
newScale = random(minScale,maxScale);
seedRandom(seed - 1,true);
oldScale = random(minScale,maxScale);
[oldScale,newScale];

Add the following expression for position:

scaleTime = 1;
holdTime = .5;

pixFactor = source.pixelAspect/thisComp.pixelAspect;
totalTime = scaleTime + holdTime;
segTime = time%totalTime;
oldScale = effect("Point Control").param("Point")[0];
newScale = effect("Point Control").param("Point")[1];
seed = Math.floor(time/totalTime) + 133;
seedRandom(seed,true);
maxX = (width/2)*(newScale/100)*pixFactor;
minX = thisComp.width - (width/2)*(newScale/100)*pixFactor;
maxY = (height/2)*(newScale/100);
minY = thisComp.height - (height/2)*(newScale/100);
newPos = random([minX,minY],[maxX,maxY]);
seedRandom(seed - 1,true);
maxX = (width/2)*(oldScale/100)*pixFactor;
minX = thisComp.width-(width/2)*(oldScale/100)*pixFactor;
maxY = (height/2)*(oldScale/100);
minY = thisComp.height - (height/2)*(oldScale/100);
oldPos = random([minX,minY],[maxX,maxY]);
if(segTime > scaleTime){
  newPos
}else{
  percent = segTime/scaleTime;
  ease(percent,oldPos,newPos)
}

Add the following expression for scale:

scaleTime = 1;
holdTime = .5;

totalTime  =scaleTime+holdTime;
segTime = time%totalTime;
oldScale = effect("Point Control").param("Point")[0];
newScale = effect("Point Control").param("Point")[1];
if(segTime > scaleTime){
  [newScale,newScale]
}else{
  percent = segTime/scaleTime;
  ease(percent,[oldScale,oldScale],[newScale,newScale])
}

Adjust the scale time, hold time, and maximum scale to suit your needs. If you change the scale time or hold time, remember to do it in all three expressions.

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