演示
源码
// @author:哒哒 QQ:285078716
// @LINK:https://www.yuelili.com/?p=19379
(function run() {
var composition = app.project.activeItem;
if (!(composition && composition instanceof CompItem)) {
alert("亲，请先选择一个合成!");
return;
}
app.beginUndoGroup("Null");
//在没有选中图层的情况下，在合成中直接创建一个空对象
var nullSize = 100;
if (composition.selectedLayers.length === 0) {
var target = composition.layers.addNull();
target.name ="空001";
target.label = 9;
target.source.width = nullSize;
target.source.height = nullSize;
target.anchorPoint.setValue([target.source.width / 2, target.source.height / 2]);
} else {
//选中图层的情况下，为所选图层创建中心父级空对象
var xmin = void(0);
var xmax = void(0);
var ymin = void(0);
var ymax = void(0);
var zmin = Infinity;
var zmax = -Infinity;
var newNull = void(0);
if (composition !== null) {
var selectedLayers = composition.selectedLayers;
//判断有没有3D图层
var allLayersAre3d = selectedLayers.filter(function(layer) {
if (layer instanceof ShapeLayer || layer instanceof TextLayer || layer instanceof AVLayer) {
return layer.threeDLayer === true;
}
return false;
}).length === selectedLayers.length;
if (selectedLayers.length > 0) {
minIndex = selectedLayers[0].index;
xmin = xmax = selectedLayers[0].property("Position").value[0];
ymin = ymax = selectedLayers[0].property("Position").value[1];
if (composition != null && composition instanceof CompItem) {
var myLayers = composition.selectedLayers;
//判断所选图层的入点和出点
if (myLayers.length != 0) {
var saveIn = composition.duration;
var saveOut = 0;
var saveIndex = composition.numLayers;
var newInpoint = composition.duration;
var newOutpoint = 0;
var myIndex = composition.numLayers;
for (var i = 0; i <= myLayers.length - 1; i += 1) {
var currentLayer = myLayers[i];
saveIn = currentLayer.stretch < 0 ? currentLayer.outPoint : currentLayer.inPoint;
saveOut = currentLayer.stretch < 0 ? currentLayer.inPoint : currentLayer.outPoint;
saveIndex = currentLayer.index;
if (saveIn < newInpoint) {
newInpoint = saveIn;
}
if (saveOut > newOutpoint) {
newOutpoint = saveOut;
}
if (saveIndex < myIndex) {
myIndex = saveIndex;
}
}
//创建修剪到选择图层总出入点的空对象
newNull = composition.layers.addNull();
newNull.name = "中心空对象";
newNull.source.width = nullSize;
newNull.source.height = nullSize;
newNull.inPoint = newInpoint;
newNull.outPoint = newOutpoint;
newNull.label = 9;
var ctr = 0;
for (var num = 0; num < selectedLayers.length; num += 1) {
lay = selectedLayers[num];
ctr++;
var xIn = lay.property("Position").value[0];
if (xIn > xmax) {
xmax = xIn;
}
if (xIn < xmin) {
xmin = xIn;
}
var yIn = lay.property("Position").value[1];
if (yIn > ymax) {
ymax = yIn;
}
if (yIn < ymin) {
ymin = yIn;
}
if (allLayersAre3d) {
var zIn = lay.property("Position").value[2];
if (zIn > zmax) {
zmax = zIn;
}
if (zIn < zmin) {
zmin = zIn;
}
}
}
var xpos = ((xmax - xmin) / 2) + xmin;
var ypos = ((ymax - ymin) / 2) + ymin;
var zpos = ((zmax - zmin) / 2) + zmin;
//如果有3D图层，返回[x,y,z]，没有，返回[x,y]
if (allLayersAre3d) {
newNull.threeDLayer = true;
newNull.property("Position").setValue([xpos, ypos, zpos]);
} else {
newNull.property("Position").setValue([xpos, ypos]);
}
newNull.anchorPoint.setValue([newNull.source.width / 2, newNull.source.height / 2]);
for (var num = 0; num < selectedLayers.length; num += 1) {
var lay = selectedLayers[num];
lay.parent = newNull;
if (lay.index < minIndex) {
minIndex = lay.index;
}
}
}
var lastLayer = composition.layer(myIndex);
var layer = composition.layer(myIndex + 1);
var isTrackMatte = lastLayer && lastLayer.enabled === false && layer instanceof ShapeLayer && layer.trackMatteType !== TrackMatteType.NO_TRACK_MATTE;
//把空对象移动到选择图层上方
newNull.moveBefore(isTrackMatte ? lastLayer : layer);
newNull.label = 9;
}
}
}
}
app.endUndoGroup();
})()
