AfterEffect(AE)插件-常规功能开发-放大缩小图层-js脚本开发-AE插件

文章目录

1.算法程序
2.文本转执行
3.作者答疑

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放大缩小图层功能。源代码如下所示：

{// Scale Selected Layers.jsx// // This script scales the selected layers within the active comp.//// First, it prompts the user for a scale_factor.// Next, it scales all selected layers, including cameras.function ScaleSelectedLayers(thisObj){var scriptName = "Scale Selected Layers";// This variable stores the scale_factor.var scale_factor = 1.0;var scale_about_center = true;//// This function is called when the user clicks the "Scale about Upper Left" button//function onCornerButtonClick(){scale_about_center = false;}//// This function is called when the user clicks the "Scale about Upper Left" button//function onCenterButtonClick(){scale_about_center = true;}//// This function is called when the user enters text for the scale.//function on_textInput_changed(){// Set the scale_factor based on the text.var value = this.text;if (isNaN(value)) {alert(value + " is not a number. Please enter a number.", scriptName);} else {scale_factor = value;}}function onScaleClick(){var activeItem = app.project.activeItem;if ((activeItem == null) || !(activeItem instanceof CompItem)) {alert("Please select or open a composition first.", scriptName);} else {var selectedLayers = activeItem.selectedLayers;if (activeItem.selectedLayers.length == 0) {alert("Please select at least one layer in the active comp first.", scriptName);} else {// Validate the input field, in case the user didn't defocus it first (which often can be the case).this.parent.parent.optsRow.text_input.notify("onChange");var activeComp = activeItem;// By bracketing the operations with begin/end undo group, we can // undo the whole script with one undo operation.app.beginUndoGroup(scriptName);// Create a null 3D layer.var null3DLayer = activeItem.layers.addNull();null3DLayer.threeDLayer = true;// Set its position to (0,0,0).if (scale_about_center) {null3DLayer.position.setValue([activeComp.width * 0.5, activeComp.height * 0.5,0]);} else {null3DLayer.position.setValue([0, 0, 0]);}// Set null3DLayer as parent of all layers that don't have parents.  makeParentLayerOfUnparentedInArray(selectedLayers, null3DLayer);// Then for all cameras, scale the Zoom parameter proportionately.scaleCameraZoomsInArray(selectedLayers, scale_factor);// Set the scale of the super parent null3DLayer proportionately.var superParentScale = null3DLayer.scale.value;superParentScale[0] = superParentScale[0] * scale_factor;superParentScale[1] = superParentScale[1] * scale_factor;superParentScale[2] = superParentScale[2] * scale_factor;null3DLayer.scale.setValue(superParentScale);// Delete the super parent null3DLayer with dejumping enabled.null3DLayer.remove();// Everything we just did changed the selection. Reselect those// same layers again.for (var i = 0; i < selectedLayers.length; i++) {selectedLayers[i].selected = true;}app.endUndoGroup();// Reset scale_factor to 1.0 for next use.scale_factor = 1.0;this.parent.parent.optsRow.text_input.text = "1.0";}}}// // This function puts up a modal dialog asking for a scale_factor.// Once the user enters a value, the dialog closes, and the script scales the comp.// function BuildAndShowUI(thisObj){// Create and show a floating palette.var my_palette = (thisObj instanceof Panel) ? thisObj : new Window("palette", scriptName, undefined, {resizeable:true});if (my_palette != null){var res = "group { \orientation:'column', alignment:['fill','top'], alignChildren:['left','top'], spacing:5, margins:[0,0,0,0], \optsRow: Group { \orientation:'column', alignment:['fill','top'], \cornerButton: RadioButton { text:'Scale about Upper Left', preferredSize:[150,20], alignment:['fill','top'] }, \centerButton: RadioButton { text:'Scale about Center', alignment:['fill','top'], value:'true' }, \text_input: EditText { text:'1.0', alignment:['left','top'], preferredSize:[80,20] }, \}, \cmds: Group { \alignment:['fill','top'], \okButton: Button { text:'Scale', alignment:['fill','center'] }, \}, \}";my_palette.margins = [10,10,10,10];my_palette.grp = my_palette.add(res);// Workaround to ensure the edittext text color is black, even at darker UI brightness levels.var winGfx = my_palette.graphics;var darkColorBrush = winGfx.newPen(winGfx.BrushType.SOLID_COLOR, [0,0,0], 1);my_palette.grp.optsRow.text_input.graphics.foregroundColor = darkColorBrush;my_palette.grp.optsRow.cornerButton.onClick  = onCornerButtonClick;my_palette.grp.optsRow.centerButton.onClick = onCenterButtonClick;// Set the callback. When the user enters text, this will be called.my_palette.grp.optsRow.text_input.onChange = on_textInput_changed;my_palette.grp.cmds.okButton.onClick = onScaleClick;my_palette.onResizing = my_palette.onResize = function () {this.layout.resize();}}return my_palette;}// // 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 makeParentLayerOfUnparentedInArray(layerArray, newParent){for (var i = 0; i < layerArray.length; i++) {var curLayer = layerArray[i];if (curLayer != newParent && curLayer.parent == null) {curLayer.parent = newParent;}}}//// Scales the zoom factor of every camera by the given scale_factor.// Handles both single values and multiple keyframe values.function scaleCameraZoomsInArray(layerArray, scaleBy){for (var i = 0; i < layerArray.length; i++) {var curLayer = layerArray[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);}}}}}// // The main script.//if (parseFloat(app.version) < 8) {alert("This script requires After Effects CS3 or later.", scriptName);return;}var my_palette = BuildAndShowUI(thisObj);if (my_palette != null) {if (my_palette instanceof Window) {my_palette.center();my_palette.show();} else {my_palette.layout.layout(true);my_palette.layout.resize();}} else {alert("Could not open the user interface.", scriptName);}}ScaleSelectedLayers(this);
}

2.文本转执行

使用记事本或者notepad++等文本编辑器，将代码拷贝至文本文件，然后修改后缀名为js或者jsx，最后再AE软件菜单文件》脚本》运行脚本文件，选择脚本文件，点执行即可，也可以将脚本放在预设文件夹内，会显示再脚本下的二级子菜单。如下图所示：

3.作者答疑

如有疑问，请留言。

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