【AE脚本】缩放所有合成

/* name：缩放所有合成
 * source：https://github.com/ff6347/after-effects-script-snippets/blob/master/scale%20all%20comps%20in%20project%20panel.jsx
 * 
 */

(function(thisObj) {

  run(thisObj);
  // 初始化 定义缩放倍率
  function run(thisObj) {
    var data = {
      scale_factor: 0.25,
      scirptname: File($.fileName)
    };

    doScale(data);

  }

// var curComp = app.project.activeItem;
//    if (!curComp || !(curComp instanceof CompItem)){
//         alert("noComp");
//         return;
//     };
//
  function doScale(data) {
    // 设置撤销组
    app.beginUndoGroup('do sale');

    for(var i = 0; i < app.project.selection.length; i++) {

      var activeItem = app.project.selection[i];// = app.project.activeItem;
      if ((activeItem === null) || !(activeItem instanceof CompItem)) {
        alert('请选择/打开一个图层先.', data.scriptName);
      } else {
        // 验证输入字段，以防用户没有先对其进行散焦（时常发生）。
        // this.parent.parent.optsRow.text_input.notify("onChange");

        var activeComp = activeItem;

        // app.beginUndoGroup(data.scriptName);

        // 创建一个空的3D 空对象
        var null3DLayer = activeItem.layers.addNull();
        null3DLayer.threeDLayer = true;

        // 位置归零 (0,0,0).
        null3DLayer.position.setValue([0, 0, 0]);

        // 将空对象设置为 所有没有父层图层 的父级层。
        makeParentLayerOfAllUnparented(activeComp, null3DLayer);

        // 设置新合成的宽高.

        activeComp.width = Math.floor(activeComp.width * data.scale_factor);
        activeComp.height = Math.floor(activeComp.height * data.scale_factor);

        // 对于相机，按比例缩放Zoom参数。
        scaleAllCameraZooms(activeComp, data.scale_factor);

        // 按初始化参数设置空对象的缩放。
        var superParentScale = null3DLayer.scale.value;
        superParentScale[0] *= data.scale_factor;
        superParentScale[1] *= data.scale_factor;
        superParentScale[2] *= data.scale_factor;
        null3DLayer.scale.setValue(superParentScale);

        // (with dejumping enabled)开启冒泡的情况下 删除空对象 .
        // 冒泡：
        null3DLayer.remove();

        // app.endUndoGroup();

        // Reset data.scale_factor to 1.0 for next use.
// ~         data.scale_factor = 1.0;
// ~         if (this.parent.parent.optsRow.scaleButton.value) {
// ~           this.parent.parent.optsRow.text_input.text = "1.0";
// ~         }
      }
    }
    app.endUndoGroup();

  }

      //
    // Scales the zoom factor of every camera by the given scale_factor.
    // Handles both single values and multiple keyframe values.
  function scaleAllCameraZooms(theComp, scaleBy) {
    for (var i = 1; i <= theComp.numLayers; i++) {
      var curLayer = theComp.layer(i);
      if (curLayer.matchName === 'ADBE Camera Layer') {
        var curZoom = curLayer.zoom;
        if (curZoom.numKeys === 0) {
          curZoom.setValue(curZoom.value * scaleBy);
        } else {
          for (var j = 1; j <= curZoom.numKeys; j++) {
            curZoom.setValueAtKey(j, curZoom.keyValue(j) * scaleBy);
          }
        }
      }
    }
  }
    // Sets newParent as the parent of all layers in theComp that don't have parents.
    // This includes 2D/3D lights, camera, av, text, etc.
    //
  function makeParentLayerOfAllUnparented(theComp, newParent) {
    for (var i = 1; i <= theComp.numLayers; i++) {
      var curLayer = theComp.layer(i);
      if (curLayer !== newParent && curLayer.parent === null) {
        curLayer.parent = newParent;
      }
    }
  }
}(this));