迪拍摄影_新浪博客

（1）形状图层与文字层子父链接

（2）形状图层---Rectangle Path---size

margin=70;

text_width=thisComp.layer("文本").sourceRectAtTime().width;

text_height=thisComp.layer("文本").sourceRectAtTime().height;

box_width=text_width+margin*2;

box_height=text_height+margin*2;

[box_width,box_height]

（3）形状图层---Transform:Rectangle---position

t=thisComp.layer("文本");

tRect=t.sourceRectAtTime(time,false);

tUL=t.toComp([tRect.left,tRect.top]);

tLR=t.toComp([tRect.left+tRect.width,tRect.top+tRect.height]);

tCenter=(tUL+tLR)/2

myRect=sourceRectAtTime(time,false);

myUL=toComp([myRect.left,myRect.top]);

myLR=toComp([myRect.left+myRect.width,myRect.top+myRect.height]);

myCenter=(myUL+myLR)/2

delta=myCenter-tCenter;

value-delta

最终效果：