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1× | import {
assign,
forEach,
isArray
} from 'min-dash';
import { setSnapped } from '../snapping/SnapUtil';
var abs= Math.abs,
round = Math.round;
var TOLERANCE = 10;
export default function BendpointSnapping(eventBus) {
function snapTo(values, value) {
Eif (isArray(values)) {
var i = values.length;
while (i--) if (abs(values[i] - value) <= TOLERANCE) {
return values[i];
}
} else {
values = +values;
var rem = value % values;
if (rem < TOLERANCE) {
return value - rem;
}
if (rem > values - TOLERANCE) {
return value - rem + values;
}
}
return value;
}
function mid(element) {
Eif (element.width) {
return {
x: round(element.width / 2 + element.x),
y: round(element.height / 2 + element.y)
};
}
}
// connection segment snapping //////////////////////
function getConnectionSegmentSnaps(context) {
var snapPoints = context.snapPoints,
connection = context.connection,
waypoints = connection.waypoints,
segmentStart = context.segmentStart,
segmentStartIndex = context.segmentStartIndex,
segmentEnd = context.segmentEnd,
segmentEndIndex = context.segmentEndIndex,
axis = context.axis;
Iif (snapPoints) {
return snapPoints;
}
var referenceWaypoints = [
waypoints[segmentStartIndex - 1],
segmentStart,
segmentEnd,
waypoints[segmentEndIndex + 1]
];
Eif (segmentStartIndex < 2) {
referenceWaypoints.unshift(mid(connection.source));
}
if (segmentEndIndex > waypoints.length - 3) {
referenceWaypoints.unshift(mid(connection.target));
}
context.snapPoints = snapPoints = { horizontal: [] , vertical: [] };
forEach(referenceWaypoints, function(p) {
// we snap on existing bendpoints only,
// not placeholders that are inserted during add
if (p) {
p = p.original || p;
if (axis === 'y') {
snapPoints.horizontal.push(p.y);
}
if (axis === 'x') {
snapPoints.vertical.push(p.x);
}
}
});
return snapPoints;
}
eventBus.on('connectionSegment.move.move', 1500, function(event) {
var context = event.context,
snapPoints = getConnectionSegmentSnaps(context),
x = event.x,
y = event.y,
sx, sy;
Iif (!snapPoints) {
return;
}
// snap
sx = snapTo(snapPoints.vertical, x);
sy = snapTo(snapPoints.horizontal, y);
// correction x/y
var cx = (x - sx),
cy = (y - sy);
// update delta
assign(event, {
dx: event.dx - cx,
dy: event.dy - cy,
x: sx,
y: sy
});
// only set snapped if actually snapped
Iif (cx || snapPoints.vertical.indexOf(x) !== -1) {
setSnapped(event, 'x', sx);
}
if (cy || snapPoints.horizontal.indexOf(y) !== -1) {
setSnapped(event, 'y', sy);
}
});
// bendpoint snapping //////////////////////
function getBendpointSnaps(context) {
var snapPoints = context.snapPoints,
waypoints = context.connection.waypoints,
bendpointIndex = context.bendpointIndex;
if (snapPoints) {
return snapPoints;
}
var referenceWaypoints = [ waypoints[bendpointIndex - 1], waypoints[bendpointIndex + 1] ];
context.snapPoints = snapPoints = { horizontal: [] , vertical: [] };
forEach(referenceWaypoints, function(p) {
// we snap on existing bendpoints only,
// not placeholders that are inserted during add
if (p) {
p = p.original || p;
snapPoints.horizontal.push(p.y);
snapPoints.vertical.push(p.x);
}
});
return snapPoints;
}
eventBus.on([ 'bendpoint.move.move', 'bendpoint.move.end' ], 1500, function(event) {
var context = event.context,
snapPoints = getBendpointSnaps(context),
target = context.target,
targetMid = target && mid(target),
x = event.x,
y = event.y,
sx, sy;
Iif (!snapPoints) {
return;
}
// snap
sx = snapTo(targetMid ? snapPoints.vertical.concat([ targetMid.x ]) : snapPoints.vertical, x);
sy = snapTo(targetMid ? snapPoints.horizontal.concat([ targetMid.y ]) : snapPoints.horizontal, y);
// correction x/y
var cx = (x - sx),
cy = (y - sy);
// update delta
assign(event, {
dx: event.dx - cx,
dy: event.dy - cy,
x: event.x - cx,
y: event.y - cy
});
// only set snapped if actually snapped
if (cx || snapPoints.vertical.indexOf(x) !== -1) {
setSnapped(event, 'x', sx);
}
if (cy || snapPoints.horizontal.indexOf(y) !== -1) {
setSnapped(event, 'y', sy);
}
});
}
BendpointSnapping.$inject = [ 'eventBus' ]; |