--- /dev/null
+/*
+ * jsPlumb
+ *
+ * Title:jsPlumb 1.5.5
+ *
+ * Provides a way to visually connect elements on an HTML page, using either SVG, Canvas
+ * elements, or VML.
+ *
+ * This file contains the state machine connectors.
+ *
+ * Thanks to Brainstorm Mobile Solutions for supporting the development of these.
+ *
+ * Copyright (c) 2010 - 2013 Simon Porritt (simon.porritt@gmail.com)
+ *
+ * http://jsplumb.org
+ * http://github.com/sporritt/jsplumb
+ * http://code.google.com/p/jsplumb
+ *
+ * Dual licensed under the MIT and GPL2 licenses.
+ */
+
+;(function() {
+
+ var Line = function(x1, y1, x2, y2) {
+
+ this.m = (y2 - y1) / (x2 - x1);
+ this.b = -1 * ((this.m * x1) - y1);
+
+ this.rectIntersect = function(x,y,w,h) {
+ var results = [], xInt, yInt;
+
+ // try top face
+ // the equation of the top face is y = (0 * x) + b; y = b.
+ xInt = (y - this.b) / this.m;
+ // test that the X value is in the line's range.
+ if (xInt >= x && xInt <= (x + w)) results.push([ xInt, (this.m * xInt) + this.b ]);
+
+ // try right face
+ yInt = (this.m * (x + w)) + this.b;
+ if (yInt >= y && yInt <= (y + h)) results.push([ (yInt - this.b) / this.m, yInt ]);
+
+ // bottom face
+ xInt = ((y + h) - this.b) / this.m;
+ // test that the X value is in the line's range.
+ if (xInt >= x && xInt <= (x + w)) results.push([ xInt, (this.m * xInt) + this.b ]);
+
+ // try left face
+ yInt = (this.m * x) + this.b;
+ if (yInt >= y && yInt <= (y + h)) results.push([ (yInt - this.b) / this.m, yInt ]);
+
+ if (results.length == 2) {
+ var midx = (results[0][0] + results[1][0]) / 2, midy = (results[0][1] + results[1][1]) / 2;
+ results.push([ midx,midy ]);
+ // now calculate the segment inside the rectangle where the midpoint lies.
+ var xseg = midx <= x + (w / 2) ? -1 : 1,
+ yseg = midy <= y + (h / 2) ? -1 : 1;
+ results.push([xseg, yseg]);
+ return results;
+ }
+
+ return null;
+
+ };
+ },
+ _segment = function(x1, y1, x2, y2) {
+ if (x1 <= x2 && y2 <= y1) return 1;
+ else if (x1 <= x2 && y1 <= y2) return 2;
+ else if (x2 <= x1 && y2 >= y1) return 3;
+ return 4;
+ },
+
+ // the control point we will use depends on the faces to which each end of the connection is assigned, specifically whether or not the
+ // two faces are parallel or perpendicular. if they are parallel then the control point lies on the midpoint of the axis in which they
+ // are parellel and varies only in the other axis; this variation is proportional to the distance that the anchor points lie from the
+ // center of that face. if the two faces are perpendicular then the control point is at some distance from both the midpoints; the amount and
+ // direction are dependent on the orientation of the two elements. 'seg', passed in to this method, tells you which segment the target element
+ // lies in with respect to the source: 1 is top right, 2 is bottom right, 3 is bottom left, 4 is top left.
+ //
+ // sourcePos and targetPos are arrays of info about where on the source and target each anchor is located. their contents are:
+ //
+ // 0 - absolute x
+ // 1 - absolute y
+ // 2 - proportional x in element (0 is left edge, 1 is right edge)
+ // 3 - proportional y in element (0 is top edge, 1 is bottom edge)
+ //
+ _findControlPoint = function(midx, midy, segment, sourceEdge, targetEdge, dx, dy, distance, proximityLimit) {
+ // TODO (maybe)
+ // - if anchor pos is 0.5, make the control point take into account the relative position of the elements.
+ if (distance <= proximityLimit) return [midx, midy];
+
+ if (segment === 1) {
+ if (sourceEdge[3] <= 0 && targetEdge[3] >= 1) return [ midx + (sourceEdge[2] < 0.5 ? -1 * dx : dx), midy ];
+ else if (sourceEdge[2] >= 1 && targetEdge[2] <= 0) return [ midx, midy + (sourceEdge[3] < 0.5 ? -1 * dy : dy) ];
+ else return [ midx + (-1 * dx) , midy + (-1 * dy) ];
+ }
+ else if (segment === 2) {
+ if (sourceEdge[3] >= 1 && targetEdge[3] <= 0) return [ midx + (sourceEdge[2] < 0.5 ? -1 * dx : dx), midy ];
+ else if (sourceEdge[2] >= 1 && targetEdge[2] <= 0) return [ midx, midy + (sourceEdge[3] < 0.5 ? -1 * dy : dy) ];
+ else return [ midx + (1 * dx) , midy + (-1 * dy) ];
+ }
+ else if (segment === 3) {
+ if (sourceEdge[3] >= 1 && targetEdge[3] <= 0) return [ midx + (sourceEdge[2] < 0.5 ? -1 * dx : dx), midy ];
+ else if (sourceEdge[2] <= 0 && targetEdge[2] >= 1) return [ midx, midy + (sourceEdge[3] < 0.5 ? -1 * dy : dy) ];
+ else return [ midx + (-1 * dx) , midy + (-1 * dy) ];
+ }
+ else if (segment === 4) {
+ if (sourceEdge[3] <= 0 && targetEdge[3] >= 1) return [ midx + (sourceEdge[2] < 0.5 ? -1 * dx : dx), midy ];
+ else if (sourceEdge[2] <= 0 && targetEdge[2] >= 1) return [ midx, midy + (sourceEdge[3] < 0.5 ? -1 * dy : dy) ];
+ else return [ midx + (1 * dx) , midy + (-1 * dy) ];
+ }
+
+ };
+
+ /**
+ * Class: Connectors.StateMachine
+ * Provides 'state machine' connectors.
+ */
+ /*
+ * Function: Constructor
+ *
+ * Parameters:
+ * curviness - measure of how "curvy" the connectors will be. this is translated as the distance that the
+ * Bezier curve's control point is from the midpoint of the straight line connecting the two
+ * endpoints, and does not mean that the connector is this wide. The Bezier curve never reaches
+ * its control points; they act as gravitational masses. defaults to 10.
+ * margin - distance from element to start and end connectors, in pixels. defaults to 5.
+ * proximityLimit - sets the distance beneath which the elements are consider too close together to bother
+ * with fancy curves. by default this is 80 pixels.
+ * loopbackRadius - the radius of a loopback connector. optional; defaults to 25.
+ * showLoopback - If set to false this tells the connector that it is ok to paint connections whose source and target is the same element with a connector running through the element. The default value for this is true; the connector always makes a loopback connection loop around the element rather than passing through it.
+ */
+ var StateMachine = function(params) {
+ params = params || {};
+ this.type = "StateMachine";
+
+ var self = this,
+ _super = jsPlumb.Connectors.AbstractConnector.apply(this, arguments),
+ curviness = params.curviness || 10,
+ margin = params.margin || 5,
+ proximityLimit = params.proximityLimit || 80,
+ clockwise = params.orientation && params.orientation === "clockwise",
+ loopbackRadius = params.loopbackRadius || 25,
+ showLoopback = params.showLoopback !== false;
+
+ this._compute = function(paintInfo, params) {
+ var w = Math.abs(params.sourcePos[0] - params.targetPos[0]),
+ h = Math.abs(params.sourcePos[1] - params.targetPos[1]),
+ x = Math.min(params.sourcePos[0], params.targetPos[0]),
+ y = Math.min(params.sourcePos[1], params.targetPos[1]);
+
+ if (!showLoopback || (params.sourceEndpoint.elementId !== params.targetEndpoint.elementId)) {
+ var _sx = params.sourcePos[0] < params.targetPos[0] ? 0 : w,
+ _sy = params.sourcePos[1] < params.targetPos[1] ? 0:h,
+ _tx = params.sourcePos[0] < params.targetPos[0] ? w : 0,
+ _ty = params.sourcePos[1] < params.targetPos[1] ? h : 0;
+
+ // now adjust for the margin
+ if (params.sourcePos[2] === 0) _sx -= margin;
+ if (params.sourcePos[2] === 1) _sx += margin;
+ if (params.sourcePos[3] === 0) _sy -= margin;
+ if (params.sourcePos[3] === 1) _sy += margin;
+ if (params.targetPos[2] === 0) _tx -= margin;
+ if (params.targetPos[2] === 1) _tx += margin;
+ if (params.targetPos[3] === 0) _ty -= margin;
+ if (params.targetPos[3] === 1) _ty += margin;
+
+ //
+ // these connectors are quadratic bezier curves, having a single control point. if both anchors
+ // are located at 0.5 on their respective faces, the control point is set to the midpoint and you
+ // get a straight line. this is also the case if the two anchors are within 'proximityLimit', since
+ // it seems to make good aesthetic sense to do that. outside of that, the control point is positioned
+ // at 'curviness' pixels away along the normal to the straight line connecting the two anchors.
+ //
+ // there may be two improvements to this. firstly, we might actually support the notion of avoiding nodes
+ // in the UI, or at least making a good effort at doing so. if a connection would pass underneath some node,
+ // for example, we might increase the distance the control point is away from the midpoint in a bid to
+ // steer it around that node. this will work within limits, but i think those limits would also be the likely
+ // limits for, once again, aesthetic good sense in the layout of a chart using these connectors.
+ //
+ // the second possible change is actually two possible changes: firstly, it is possible we should gradually
+ // decrease the 'curviness' as the distance between the anchors decreases; start tailing it off to 0 at some
+ // point (which should be configurable). secondly, we might slightly increase the 'curviness' for connectors
+ // with respect to how far their anchor is from the center of its respective face. this could either look cool,
+ // or stupid, and may indeed work only in a way that is so subtle as to have been a waste of time.
+ //
+
+ var _midx = (_sx + _tx) / 2, _midy = (_sy + _ty) / 2,
+ m2 = (-1 * _midx) / _midy, theta2 = Math.atan(m2),
+ dy = (m2 == Infinity || m2 == -Infinity) ? 0 : Math.abs(curviness / 2 * Math.sin(theta2)),
+ dx = (m2 == Infinity || m2 == -Infinity) ? 0 : Math.abs(curviness / 2 * Math.cos(theta2)),
+ segment = _segment(_sx, _sy, _tx, _ty),
+ distance = Math.sqrt(Math.pow(_tx - _sx, 2) + Math.pow(_ty - _sy, 2)),
+ // calculate the control point. this code will be where we'll put in a rudimentary element avoidance scheme; it
+ // will work by extending the control point to force the curve to be, um, curvier.
+ _controlPoint = _findControlPoint(_midx,
+ _midy,
+ segment,
+ params.sourcePos,
+ params.targetPos,
+ curviness, curviness,
+ distance,
+ proximityLimit);
+
+ _super.addSegment(this, "Bezier", {
+ x1:_tx, y1:_ty, x2:_sx, y2:_sy,
+ cp1x:_controlPoint[0], cp1y:_controlPoint[1],
+ cp2x:_controlPoint[0], cp2y:_controlPoint[1]
+ });
+ }
+ else {
+ // a loopback connector. draw an arc from one anchor to the other.
+ var x1 = params.sourcePos[0], x2 = params.sourcePos[0], y1 = params.sourcePos[1] - margin, y2 = params.sourcePos[1] - margin,
+ cx = x1, cy = y1 - loopbackRadius,
+ // canvas sizing stuff, to ensure the whole painted area is visible.
+ _w = 2 * loopbackRadius,
+ _h = 2 * loopbackRadius,
+ _x = cx - loopbackRadius,
+ _y = cy - loopbackRadius;
+
+ paintInfo.points[0] = _x;
+ paintInfo.points[1] = _y;
+ paintInfo.points[2] = _w;
+ paintInfo.points[3] = _h;
+
+ // ADD AN ARC SEGMENT.
+ _super.addSegment(this, "Arc", {
+ loopback:true,
+ x1:(x1 - _x) + 4,
+ y1:y1 - _y,
+ startAngle:0,
+ endAngle: 2 * Math.PI,
+ r:loopbackRadius,
+ ac:!clockwise,
+ x2:(x1 - _x) - 4,
+ y2:y1 - _y,
+ cx:cx - _x,
+ cy:cy - _y
+ });
+ }
+ };
+ };
+ jsPlumb.registerConnectorType(StateMachine, "StateMachine");
+})();
+
+/*
+ // a possible rudimentary avoidance scheme, old now, perhaps not useful.
+ // if (avoidSelector) {
+ // var testLine = new Line(sourcePos[0] + _sx,sourcePos[1] + _sy,sourcePos[0] + _tx,sourcePos[1] + _ty);
+ // var sel = jsPlumb.getSelector(avoidSelector);
+ // for (var i = 0; i < sel.length; i++) {
+ // var id = jsPlumb.getId(sel[i]);
+ // if (id != sourceEndpoint.elementId && id != targetEndpoint.elementId) {
+ // o = jsPlumb.getOffset(id), s = jsPlumb.getSize(id);
+//
+// if (o && s) {
+// var collision = testLine.rectIntersect(o.left,o.top,s[0],s[1]);
+// if (collision) {
+ // set the control point to be a certain distance from the midpoint of the two points that
+ // the line crosses on the rectangle.
+ // TODO where will this 75 number come from?
+ // _controlX = collision[2][0] + (75 * collision[3][0]);
+ // / _controlY = collision[2][1] + (75 * collision[3][1]);
+// }
+// }
+ // }
+ // }
+ //}
+ */
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git://git.onelab.eu / unfold.git / blobdiff