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| import { is } from '../../util/ModelUtil';
import {
getMid,
asTRBL,
getOrientation
} from 'diagram-js/lib/layout/LayoutUtil';
import {
find,
reduce
} from 'min-dash';
var DEFAULT_HORIZONTAL_DISTANCE = 50;
var MAX_HORIZONTAL_DISTANCE = 250;
// padding to detect element placement
var PLACEMENT_DETECTION_PAD = 10;
/**
* Always try to place element right of source;
* compute actual distance from previous nodes in flow.
*/
export function getFlowNodePosition(source, element) {
var sourceTrbl = asTRBL(source);
var sourceMid = getMid(source);
var horizontalDistance = getFlowNodeDistance(source, element);
var orientation = 'left',
rowSize = 80,
margin = 30;
if (is(source, 'bpmn:BoundaryEvent')) {
orientation = getOrientation(source, source.host, -25);
if (orientation.indexOf('top') !== -1) {
margin *= -1;
}
}
function getVerticalDistance(orient) {
if (orient.indexOf('top') != -1) {
return -1 * rowSize;
} else if (orient.indexOf('bottom') != -1) {
return rowSize;
} else {
return 0;
}
}
var position = {
x: sourceTrbl.right + horizontalDistance + element.width / 2,
y: sourceMid.y + getVerticalDistance(orientation)
};
var escapeDirection = {
y: {
margin: margin,
rowSize: rowSize
}
};
return deconflictPosition(source, element, position, escapeDirection);
}
/**
* Compute best distance between source and target,
* based on existing connections to and from source.
*
* @param {djs.model.Shape} source
* @param {djs.model.Shape} element
*
* @return {Number} distance
*/
export function getFlowNodeDistance(source, element) {
var sourceTrbl = asTRBL(source);
// is connection a reference to consider?
function isReference(c) {
return is(c, 'bpmn:SequenceFlow');
}
function toTargetNode(weight) {
return function(shape) {
return {
shape: shape,
weight: weight,
distanceTo: function(shape) {
var shapeTrbl = asTRBL(shape);
return shapeTrbl.left - sourceTrbl.right;
}
};
};
}
function toSourceNode(weight) {
return function(shape) {
return {
shape: shape,
weight: weight,
distanceTo: function(shape) {
var shapeTrbl = asTRBL(shape);
return sourceTrbl.left - shapeTrbl.right;
}
};
};
}
// we create a list of nodes to take into consideration
// for calculating the optimal flow node distance
//
// * weight existing target nodes higher than source nodes
// * only take into account individual nodes once
//
var nodes = reduce([].concat(
getTargets(source, isReference).map(toTargetNode(5)),
getSources(source, isReference).map(toSourceNode(1))
), function(nodes, node) {
// filter out shapes connected twice via source or target
nodes[node.shape.id + '__weight_' + node.weight] = node;
return nodes;
}, {});
// compute distances between source and incoming nodes;
// group at the same time by distance and expose the
// favourite distance as { fav: { count, value } }.
var distancesGrouped = reduce(nodes, function(result, node) {
var shape = node.shape,
weight = node.weight,
distanceTo = node.distanceTo;
var fav = result.fav,
currentDistance,
currentDistanceCount,
currentDistanceEntry;
currentDistance = distanceTo(shape);
// ignore too far away peers
// or non-left to right modeled nodes
if (currentDistance < 0 || currentDistance > MAX_HORIZONTAL_DISTANCE) {
return result;
}
currentDistanceEntry = result[String(currentDistance)] =
result[String(currentDistance)] || {
value: currentDistance,
count: 0
};
// inc diff count
currentDistanceCount = currentDistanceEntry.count += 1 * weight;
if (!fav || fav.count < currentDistanceCount) {
result.fav = currentDistanceEntry;
}
return result;
}, { });
if (distancesGrouped.fav) {
return distancesGrouped.fav.value;
} else {
return DEFAULT_HORIZONTAL_DISTANCE;
}
}
/**
* Always try to place text annotations top right of source.
*/
export function getTextAnnotationPosition(source, element) {
var sourceTrbl = asTRBL(source);
var position = {
x: sourceTrbl.right + element.width / 2,
y: sourceTrbl.top - 50 - element.height / 2
};
var escapeDirection = {
y: {
margin: -30,
rowSize: 20
}
};
return deconflictPosition(source, element, position, escapeDirection);
}
/**
* Always put element bottom right of source.
*/
export function getDataElementPosition(source, element) {
var sourceTrbl = asTRBL(source);
var position = {
x: sourceTrbl.right - 10 + element.width / 2,
y: sourceTrbl.bottom + 40 + element.width / 2
};
var escapeDirection = {
x: {
margin: 30,
rowSize: 30
}
};
return deconflictPosition(source, element, position, escapeDirection);
}
/**
* Always put element right of source per default.
*/
export function getDefaultPosition(source, element) {
var sourceTrbl = asTRBL(source);
var sourceMid = getMid(source);
// simply put element right next to source
return {
x: sourceTrbl.right + DEFAULT_HORIZONTAL_DISTANCE + element.width / 2,
y: sourceMid.y
};
}
/**
* Returns all connected elements around the given source.
*
* This includes:
*
* - connected elements
* - host connected elements
* - attachers connected elements
*
* @param {djs.model.Shape} source
* @param {djs.model.Shape} element
*
* @return {Array<djs.model.Shape>}
*/
function getAutoPlaceClosure(source, element) {
var allConnected = getConnected(source);
if (source.host) {
allConnected = allConnected.concat(getConnected(source.host));
}
Eif (source.attachers) {
allConnected = allConnected.concat(source.attachers.reduce(function(shapes, attacher) {
return shapes.concat(getConnected(attacher));
}, []));
}
return allConnected;
}
/**
* Return target at given position, if defined.
*
* This takes connected elements from host and attachers
* into account, too.
*/
export function getConnectedAtPosition(source, position, element) {
var bounds = {
x: position.x - (element.width / 2),
y: position.y - (element.height / 2),
width: element.width,
height: element.height
};
var closure = getAutoPlaceClosure(source, element);
return find(closure, function(target) {
Iif (target === element) {
return false;
}
var orientation = getOrientation(target, bounds, PLACEMENT_DETECTION_PAD);
return orientation === 'intersect';
});
}
/**
* Returns a new, position for the given element
* based on the given element that is not occupied
* by some element connected to source.
*
* Take into account the escapeDirection (where to move
* on positining clashes) in the computation.
*
* @param {djs.model.Shape} source
* @param {djs.model.Shape} element
* @param {Point} position
* @param {Object} escapeDelta
*
* @return {Point}
*/
export function deconflictPosition(source, element, position, escapeDelta) {
function nextPosition(existingElement) {
var newPosition = {
x: position.x,
y: position.y
};
[ 'x', 'y' ].forEach(function(axis) {
var axisDelta = escapeDelta[axis];
if (!axisDelta) {
return;
}
var dimension = axis === 'x' ? 'width' : 'height';
var margin = axisDelta.margin,
rowSize = axisDelta.rowSize;
if (margin < 0) {
newPosition[axis] = Math.min(
existingElement[axis] + margin - element[dimension] / 2,
position[axis] - rowSize + margin
);
} else {
newPosition[axis] = Math.max(
existingTarget[axis] + existingTarget[dimension] + margin + element[dimension] / 2,
position[axis] + rowSize + margin
);
}
});
return newPosition;
}
var existingTarget;
// deconflict position until free slot is found
while ((existingTarget = getConnectedAtPosition(source, position, element))) {
position = nextPosition(existingTarget);
}
return position;
}
// helpers //////////////////////
function noneFilter() {
return true;
}
function getConnected(element, connectionFilter) {
return [].concat(
getTargets(element, connectionFilter),
getSources(element, connectionFilter)
);
}
function getSources(shape, connectionFilter) {
if (!connectionFilter) {
connectionFilter = noneFilter;
}
return shape.incoming.filter(connectionFilter).map(function(c) {
return c.source;
});
}
function getTargets(shape, connectionFilter) {
if (!connectionFilter) {
connectionFilter = noneFilter;
}
return shape.outgoing.filter(connectionFilter).map(function(c) {
return c.target;
});
} |