gojs/extensions/ResizeMultipleTool.js

Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams

"use strict";
/*
*  Copyright (C) 1998-2020 by Northwoods Software Corporation. All Rights Reserved.
*/

/*
* This is an extension and not part of the main GoJS library.
* Note that the API for this class may change with any version, even point releases.
* If you intend to use an extension in production, you should copy the code to your own source directory.
* Extensions can be found in the GoJS kit under the extensions or extensionsTS folders.
* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
*/

/**
* @constructor
* @extends ResizingTool
* @class
* A custom tool for resizing multiple objects at once.
*/
function ResizeMultipleTool() {
  go.ResizingTool.call(this);
  this.name = "ResizeMultiple";
}
go.Diagram.inherit(ResizeMultipleTool, go.ResizingTool);

/**
* Overrides ResizingTool.resize to resize all selected objects to the same size.
* @this {ResizeMultipleTool}
* @param {Rect} newr the intended new rectangular bounds for each Part's {@link Part#resizeObject}.
*/
ResizeMultipleTool.prototype.resize = function(newr) {
  var diagram = this.diagram;
  if (diagram === null) return;
  diagram.selection.each(function(part) {
    if (part instanceof go.Link || part instanceof go.Group) return; // only Nodes and simple Parts
    var obj = part.resizeObject;

    // calculate new location
    var pos = part.position.copy();
    var angle = obj.getDocumentAngle();
    var sc = obj.getDocumentScale();

    var radAngle = Math.PI * angle / 180;
    var angleCos = Math.cos(radAngle);
    var angleSin = Math.sin(radAngle);

    var deltaWidth = newr.width - obj.naturalBounds.width;
    var deltaHeight = newr.height - obj.naturalBounds.height;

    var angleRight = (angle > 270 || angle < 90) ? 1 : 0;
    var angleBottom = (angle > 0 && angle < 180) ? 1 : 0;
    var angleLeft = (angle > 90 && angle < 270) ? 1 : 0;
    var angleTop = (angle > 180 && angle < 360) ? 1 : 0;

    pos.x += sc * ((newr.x + deltaWidth * angleLeft) * angleCos - (newr.y + deltaHeight * angleBottom) * angleSin);
    pos.y += sc * ((newr.x + deltaWidth * angleTop) * angleSin + (newr.y + deltaHeight * angleLeft) * angleCos);

    obj.desiredSize = newr.size;
    part.position = pos;
  });
}