1.算法程序

  AfterEffect(AE)插件是Adobe公司开发的特效制作软件，稳定快速的功能和特效，在视频制作领域使用非常广泛，本文向大家介绍如何在项目里进行复制组合图层功能。源代码如下所示：

{
    // Double-Up.jsx
    // 
    // This script creates duplicates of the layers in a composition and
    // lays them side by side with the original layers. You can use this 
    // script to compare different settings on the same footage.
    // 
    // Notes:
    // This script works best when it is initially applied to a footage layer 
    // that's the same size as and centered within its composition. 
    // Re-running the script allows you to double-up the previous layers.
    
    
    function DoubleUp()
    {
        var doubleUpData = new Object();
        doubleUpData.scriptName = "Double-Up";
        
        doubleUpData.strErrNoCompSel = "Select or open a composition, then try again.";
        
        doubleUpData.favorLongerDim = 0;    // set to 1 to lay side-by-side along longest dimension (width or height)
        
        var comp = app.project.activeItem;
        if ((comp == null) || !(comp instanceof CompItem)) {
            alert(doubleUpData.strErrNoCompSel, doubleUpData.scriptName);
            return;
        }
        
        var selLayers = new Array();
        for (var i=1; i<=comp.numLayers; i++)
            selLayers[selLayers.length] = comp.layer(i);
        
        // first layer is the first selected layer; this controls width and height
        var firstLayer = selLayers[0];
        
        // revised comp settings
        var widthIsLonger = (comp.width > comp.height);
        var xOffset = (doubleUpData.favorLongerDim == widthIsLonger) ? comp.width : 0;
        var yOffset = (doubleUpData.favorLongerDim == widthIsLonger) ? 0 : comp.height;
        
        app.beginUndoGroup(doubleUpData.scriptName);
        
        comp.width = comp.width * ((doubleUpData.favorLongerDim == widthIsLonger) ? 2 : 1);
        comp.height = comp.height * ((doubleUpData.favorLongerDim == widthIsLonger) ? 1 : 2);
        
        for (var i=0; i<selLayers.length; i++) {
            var newLayer = selLayers[i].duplicate();
            newLayer.name = selLayers[i].name;
            newLayer.moveToEnd();
            newLayer.position.setValue([selLayers[i].position.value[0] + xOffset, selLayers[i].position.value[1] + yOffset]);
        }
        
        app.endUndoGroup();
    }
    
    DoubleUp();
}

2.作者答疑

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