如何在 Photoshop 脚本中将图层居中？

Question

我的 Photoshop 画布是 900X600。

下面的函数获取Layer X并制作Layer X。

它需要 X 层复制，并在保持比例的同时将高度调整为 600 像素。 var newdLayer

它需要 X 层，并在保持比率的同时将宽度调整为 900 像素并应用高斯模糊。 var blur.

然后合并Layer X和Layer X copy。

问题在于，如果 X 层 不在脚本开头居中，则会出现故障。

如何在脚本开头的Layer X中添加中心层？

(function (){

var docRef = activeDocument
var blur = docRef.activeLayer;
var newdLayer = blur.duplicate();

    var startRulerUnits = app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS;

    // since we resize based on the initial size of the source layer, 
    // we don't need to get the bounds twice
    var bounds = blur.bounds;
    var height = bounds[3].value - bounds[1].value;
    var width = bounds[2].value - bounds[0].value;
    // declare 2 different vars for your sizes (there are better ways to do this, but
    // since you say you aren't a JavaScript pro, I figured I'd keep it simple)
    var newSize600 = (100 / height) * 600;
    var newSize900 = (100 / width) * 900;
    // resize your layers
    newdLayer.resize(newSize600, newSize600, AnchorPosition.MIDDLECENTER);
    blur.resize(newSize900, newSize900, AnchorPosition.MIDDLECENTER);
    // apply blur
    blur.applyGaussianBlur(5);

    // below creates the group, moves the layers to it and merges them. Feel free to just include this part
    // at the end of your function if you don't want to use the modified code above. 

    // create a new layer set
    var groupOne = docRef.layerSets.add();

    // move the blur layer inside the layer set and name the layer for posterity
    blur.move(groupOne, ElementPlacement.INSIDE);
    blur.name = "blur";

    // move the newdLayer inside and rename
    newdLayer.move(groupOne, ElementPlacement.INSIDE);
    newdLayer.name = "newdLayer";

    // merge the layer set and name the new layer
    var mergedGroup = groupOne.merge();
    mergedGroup.name = "newdLayer + blur";

    app.preferences.rulerUnits = startRulerUnits;

})();

Answer 1

您需要做的是计算图层中心和文档中心之间的差异，然后在复制之前将blur 图层转换为该差异。

要计算图层中心，您需要使用bound[0].value 和bound[1].value（从文档左上角到图层左上角的距离）并添加一半的width 和一半的@987654325 @。然后计算增量，从文档中心坐标中减去图层中心坐标。

代码如下：

(function()
{

    var startRulerUnits = app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS;

    var docRef = activeDocument;
    var blur = docRef.activeLayer;

    // since we resize based on the initial size of the source layer, 
    // we don't need to get the bounds twice
    var bounds = blur.bounds;
    var height = bounds[3].value - bounds[1].value;
    var width = bounds[2].value - bounds[0].value;

    /////////////////////////////////////////////////////////////////////////////////////
    // Centering the layer

    // Getting center coordinates of the document
    var docCenterW = docRef.width.as("px") / 2;
    var docCenterH = docRef.height.as("px") / 2;

    // getting values to translate the layer. 
    var deltaX = Math.round(docCenterW - (bounds[0].value + width / 2));
    var deltaY = Math.round(docCenterH - (bounds[1].value + height / 2));

    blur.translate(deltaX, deltaY);
    /////////////////////////////////////////////////////////////////////////////////////

    var newdLayer = blur.duplicate();

    // declare 2 different vars for your sizes (there are better ways to do this, but
    // since you say you aren't a JavaScript pro, I figured I'd keep it simple)
    var newSize600 = (100 / height) * 600;
    var newSize900 = (100 / width) * 900;
    // resize your layers
    newdLayer.resize(newSize600, newSize600, AnchorPosition.MIDDLECENTER);
    blur.resize(newSize900, newSize900, AnchorPosition.MIDDLECENTER);
    // apply blur
    blur.applyGaussianBlur(5);

    // below creates the group, moves the layers to it and merges them. Feel free to just include this part
    // at the end of your function if you don't want to use the modified code above. 

    // create a new layer set
    var groupOne = docRef.layerSets.add();

    // move the blur layer inside the layer set and name the layer for posterity
    blur.move(groupOne, ElementPlacement.INSIDE);
    blur.name = "blur";

    // move the newdLayer inside and rename
    newdLayer.move(groupOne, ElementPlacement.INSIDE);
    newdLayer.name = "newdLayer";

    // merge the layer set and name the new layer
    var mergedGroup = groupOne.merge();
    mergedGroup.name = "newdLayer + blur";

    app.preferences.rulerUnits = startRulerUnits;

})();