GeometryReshapingTool.js

"use strict";
/*
*  Copyright (C) 1998-2018 by Northwoods Software Corporation. All Rights Reserved.
*/

/**
* @constructor
* @extends Tool
* @class
* This GeometryReshapingTool class allows for a Shape's Geometry to be modified by the user
* via the dragging of tool handles. 
* This does not handle Links, whose routes should be reshaped by the LinkReshapingTool.
* The {@link #reshapeObjectName} needs to identify the named {@link Shape} within the
* selected {@link Part}.
* If the shape cannot be found or if its {@link Shape#geometry} is not of type {@link Geometry#Path},
* this will not show any GeometryReshaping {@link Adornment}.
* At the current time this tool does not support adding or removing {@link PathSegment}s to the Geometry.
*/
function GeometryReshapingTool() {
	go.Tool.call(this);
	this.name = "GeometryReshaping";

	var h = new go.Shape();
  h.figure = "Diamond";
  h.desiredSize = new go.Size(7, 7);
  h.fill = "lightblue";
  h.stroke = "dodgerblue";
  h.cursor = "move";
  /** @type {GraphObject} */
	this._handleArchetype = h;

  /** @type {string} */
	this._reshapeObjectName = 'SHAPE';  //??? can't add Part.reshapeObjectName property
  // there's no Part.reshapeAdornmentTemplate either

  // internal state
  /** @type {GraphObject} */
	this._handle = null;
  /** @type {Shape} */
	this._adornedShape = null;
  /** @type {Geometry} */
	this._originalGeometry = null;  // in case the tool is cancelled and the UndoManager is not enabled
}
go.Diagram.inherit(GeometryReshapingTool, go.Tool);


/*
* A small GraphObject used as a reshape handle for each segment.
* The default GraphObject is a small blue diamond.
* @name GeometryReshapingTool#handleArchetype 
* @function.
* @return {GraphObject}
*/
Object.defineProperty(GeometryReshapingTool.prototype, "handleArchetype", {
  get: function() { return this._handleArchetype; },
  set: function(val) { this._handleArchetype = value; }
});

/*
* The name of the GraphObject to be reshaped.
* @name GeometryReshapingTool#reshapeObjectName
* @function.
* @return {string}
*/
Object.defineProperty(GeometryReshapingTool.prototype, "reshapeObjectName", {
  get: function() { return this._reshapeObjectName; },
  set: function(val) { this._reshapeObjectName = value; }
});

/*
* This read-only property returns the {@link GraphObject} that is the tool handle being dragged by the user.
* This will be contained by an {@link Adornment} whose category is "GeometryReshaping".
* Its {@link Adornment#adornedObject} is the same as the {@link #adornedShape}.
* @name GeometryReshapingTool#handle
* @function.
* @return {GraphObject}
*/
Object.defineProperty(GeometryReshapingTool.prototype, "handle", {
  get: function() { return this._handle; }
});

/*
* Gets the {@link Shape} that is being reshaped.
* This must be contained within the selected Part.
* @name GeometryReshapingTool#adornedShape
* @function.
* @return {Shape}
*/
Object.defineProperty(GeometryReshapingTool.prototype, "adornedShape", {
  get: function() { return this._adornedShape; }
});

/*
* This read-only property remembers the original value for {@link Shape#geometry},
* so that it can be restored if this tool is cancelled.
* @name GeometryReshapingTool#originalGeometry
* @function.
* @return {Geometry}
*/
Object.defineProperty(GeometryReshapingTool.prototype, "originalGeometry", {
  get: function() { return this._originalGeometry; }
});


/**
* Show an {@link Adornment} with a reshape handle at each point of the geometry.
* Don't show anything if {@link #reshapeObjectName} doesn't identify a {@link Shape}
* that has a {@link Shape#geometry} of type {@link Geometry#Path}.
* @this {GeometryReshapingTool}
* @param {Part} part the part.
*/
GeometryReshapingTool.prototype.updateAdornments = function(part) {
  if (part === null || part instanceof go.Link) return;  // this tool never applies to Links
  if (part.isSelected && !this.diagram.isReadOnly) {
    var selelt = part.findObject(this.reshapeObjectName);
    if (selelt instanceof go.Shape && selelt.actualBounds.isReal() && selelt.isVisibleObject() &&
        part.canReshape() && part.actualBounds.isReal() && part.isVisible() &&
        selelt.geometry.type === go.Geometry.Path) {
      var adornment = part.findAdornment(this.name);
      if (adornment === null) {
        adornment = this.makeAdornment(selelt);
      }
      if (adornment !== null) {
        // update the position/alignment of each handle
        var geo = selelt.geometry;
        var b = geo.bounds;
        // update the size of the adornment
        adornment.findObject("BODY").desiredSize = b.size;
        adornment.elements.each(function(h) {
          if (h._typ === undefined) return;
          var fig = geo.figures.elt(h._fig);
          var seg = fig.segments.elt(h._seg);
          var x = 0;
          var y = 0;
          switch (h._typ) {
            case 0: x = fig.startX; y = fig.startY; break;
            case 1: x = seg.endX; y = seg.endY; break;
            case 2: x = seg.point1X; y = seg.point1Y; break;
            case 3: x = seg.point2X; y = seg.point2Y; break;
          }
          var bw = b.width;
          if (bw === 0) bw = 0.001;
          var bh = b.height;
          if (bh === 0) bh = 0.001;
          h.alignment = new go.Spot(Math.max(0, Math.min((x - b.x) / bw, 1)),
                                    Math.max(0, Math.min((y - b.y) / bh, 1)));
        });

        part.addAdornment(this.name, adornment);
        adornment.location = selelt.getDocumentPoint(go.Spot.TopLeft);
        adornment.angle = selelt.getDocumentAngle();
        return;
      }
    }
  }
  part.removeAdornment(this.name);
};

/*
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.makeAdornment = function(selelt) {
  var adornment = new go.Adornment();
  adornment.type = go.Panel.Spot;
  adornment.locationObjectName = "BODY";
  adornment.locationSpot = new go.Spot(0, 0, -selelt.strokeWidth / 2, -selelt.strokeWidth / 2);
  var h = new go.Shape();
  h.name = "BODY";
  h.fill = null;
  h.stroke = null;
  h.strokeWidth = 0;
  adornment.add(h);

  var geo = selelt.geometry;
  // requires Path Geometry, checked above in updateAdornments
  for (var f = 0; f < geo.figures.count; f++) {
    var fig = geo.figures.elt(f);
    for (var g = 0; g < fig.segments.count; g++) {
      var seg = fig.segments.elt(g);
      var h;
      if (g === 0) {
        h = this.makeHandle(selelt, fig, seg);
        if (h !== null) {
          h._typ = 0;
          h._fig = f;
          h._seg = g;
          adornment.add(h);
        }
      }
      h = this.makeHandle(selelt, fig, seg);
      if (h !== null) {
        h._typ = 1;
        h._fig = f;
        h._seg = g;
        adornment.add(h);
      }
      if (seg.type === go.PathSegment.QuadraticBezier || seg.type === go.PathSegment.Bezier) {
        h = this.makeHandle(selelt, fig, seg);
        if (h !== null) {
          h._typ = 2;
          h._fig = f;
          h._seg = g;
          adornment.add(h);
        }
        if (seg.type === go.PathSegment.Bezier) {
          h = this.makeHandle(selelt, fig, seg);
          if (h !== null) {
            h._typ = 3;
            h._fig = f;
            h._seg = g;
            adornment.add(h);
          }
        }
      }
    }
  }
  adornment.category = this.name;
  adornment.adornedObject = selelt;
  return adornment;
};

/*
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.makeHandle = function(selelt, fig, seg) {
  var h = this.handleArchetype;
  if (h === null) return null;
  return h.copy();
};


/*
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.canStart = function() {
  if (!this.isEnabled) return false;

  var diagram = this.diagram;
  if (diagram === null || diagram.isReadOnly) return false;
  if (!diagram.allowReshape) return false;
  if (!diagram.lastInput.left) return false;
  var h = this.findToolHandleAt(diagram.firstInput.documentPoint, this.name);
  return (h !== null);
};

/**
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.doActivate = function() {
  var diagram = this.diagram;
  if (diagram === null) return;
  this._handle = this.findToolHandleAt(diagram.firstInput.documentPoint, this.name);
  if (this._handle === null) return;
  var shape = this._handle.part.adornedObject;
  if (!shape) return;
  this._adornedShape = shape;
  diagram.isMouseCaptured = true;
  this.startTransaction(this.name);
  this._originalGeometry = shape.geometry;
  this.isActive = true;
};

/**
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.doDeactivate = function() {
  this.stopTransaction();

  this._handle = null;
  this._adornedShape = null;
  var diagram = this.diagram;
  if (diagram !== null) diagram.isMouseCaptured = false;
  this.isActive = false;
};

/**
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.doCancel = function() {
  var shape = this._adornedShape;
  if (shape !== null) {
    // explicitly restore the original route, in case !UndoManager.isEnabled
    shape.geometry = this._originalGeometry;
  }
  this.stopTool();
};

/**
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.doMouseMove = function() {
  var diagram = this.diagram;
  if (this.isActive && diagram !== null) {
    var newpt = this.computeReshape(diagram.lastInput.documentPoint);
    this.reshape(newpt);
  }
};

/**
* @this {GeometryReshapingTool}
*/
GeometryReshapingTool.prototype.doMouseUp = function() {
  var diagram = this.diagram;
  if (this.isActive && diagram !== null) {
    var newpt = this.computeReshape(diagram.lastInput.documentPoint);
    this.reshape(newpt);
    this.transactionResult = this.name;  // success
  }
  this.stopTool();
};

/**
* @expose
* @this {GeometryReshapingTool}
* @param {Point} newPoint the value of the call to {@link #computeReshape}.
*/
GeometryReshapingTool.prototype.reshape = function(newPoint) {
  var shape = this.adornedShape;
  var locpt = shape.getLocalPoint(newPoint);
  var geo = shape.geometry.copy();
  shape.desiredSize = new go.Size(NaN, NaN); // set the desiredSize once we've gotten our Geometry so we don't clobber
  var type = this.handle._typ;
  if (type === undefined) return;
  var fig = geo.figures.elt(this.handle._fig);
  var seg = fig.segments.elt(this.handle._seg);
  switch (type) {
    case 0: fig.startX = locpt.x; fig.startY = locpt.y; break;
    case 1: seg.endX = locpt.x; seg.endY = locpt.y; break;
    case 2: seg.point1X = locpt.x; seg.point1Y = locpt.y; break;
    case 3: seg.point2X = locpt.x; seg.point2Y = locpt.y; break;
  }
  var offset = geo.normalize();  // avoid any negative coordinates in the geometry
  shape.geometry = geo;  // modify the Shape
  var part = shape.part;  // move the Part holding the Shape
  if (!part.locationSpot.equals(go.Spot.Center)) {  // but only if the locationSpot isn't Center
    part.move(part.position.copy().subtract(offset));
  }
  this.updateAdornments(part);  // update any Adornments of the Part
  this.diagram.maybeUpdate();  // force more frequent drawing for smoother looking behavior
};


/**
* @expose
* @this {GeometryReshapingTool}
* @param {Point} p the point where the handle is being dragged.
* @return {Point}
*/
GeometryReshapingTool.prototype.computeReshape = function(p) {
  return p;  // no constraints on the points
};