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labelPath.js
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labelPath.js
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function shapeAsPoint(point) {
// Checks if given point is a Point object, and if not returns it as Point.
if (point instanceof Point) {
return point;
} else {
return new Point(point);
}
}
function createLabel(labelPoint, labelContent) {
// Factory function to create label objects with associated moveable frame for word wrapping
this.label = new PointText({
point: labelPoint,
content: labelContent,
fillColor: 'white',
fontFamily: 'Helvetica',
fontSize: '20px',
shadowColor: 'black',
shadowBlur: 4,
name: 'label'
});
this.label.box = new Path.Rectangle(label.strokeBounds);
this.label.box.name = 'selectBox';
this.label.box.initWidth = this.label.box.bounds.width;
this.label.box.label = this.label;
this.label.box.shiftAnchor = function(segment, delta) {
// Provided an anchor segment and a delta point, rigidly moves anchor maintaining rectangular shape
switch (segment.index) {
case 0:
var xIndex = 1;
var yIndex = 3;
if (segment.point.x + delta.x > this.segments[yIndex].point.x) {
return;
}
break;
case 1:
var xIndex = 0;
var yIndex = 2;
if (segment.point.x + delta.x > this.segments[yIndex].point.x) {
return;
}
break;
case 2:
var xIndex = 3;
var yIndex = 1;
if (segment.point.x + delta.x < this.segments[yIndex].point.x) {
return;
}
break;
case 3:
var xIndex = 2;
var yIndex = 0;
if (segment.point.x + delta.x < this.segments[yIndex].point.x) {
return;
}
break;
default:
throw new Error('Segment mismatch!');
}
segment.point.x = segment.point.x + delta.x;
this.segments[xIndex].point.x = this.segments[xIndex].point.x + delta.x;
var textTopShift = this.label.point.y - this.label.bounds.topLeft.y;
this.label.point = this.segments[1].point.add([0,textTopShift]);
this.label.wordWrap();
this.segments[0].point.y = this.label.bounds.bottomLeft.y;
this.segments[3].point.y = this.label.bounds.bottomLeft.y;
}
this.label.longestIndex = function(array) {
var compare = 0;
var longest = 0;
for (var i = 0; i < array.length; i++) {
if (array[i].length > compare) {
longest = i;
compare = array[i].length;
}
}
return longest;
}
this.label.wordWrap = function() {
//label.wordwrap // A function that checks label bounding box against the selectBox and wraps words as appropriate using label.content and \n and simple rules
// Deal with text running off bottom of square
if (this.bounds.width > this.box.bounds.width) {
// store label content as an array of lines, splitting by \n
lines = this.content.split('\n');
longIndex = this.longestIndex(lines);
longWords = lines[longIndex].split(" ");
if (longWords.length > 1) {
lines[longIndex] = longWords.slice(0, -1).join(" ");
lines[longIndex+1] = (lines[longIndex+1] && [longWords.slice(-1), lines[longIndex+1]].join(" ")) ||
longWords.slice(-1);
}
this.content = lines.join('\n');
} else if (this.bounds.width < this.box.bounds.width) {
lines = this.content.split('\n');
if (this.box.initWidth < this.box.bounds.width) {
this.content = lines.join(" ");
}
}
}
this.label.nearestLabelBound = function(point) {
// Returns nearest label rectangle anchor to given point. Can be
// used to snap a Path object to label bounding box anchor by
// using method output as path start/end point for draw path
// methods below.
var point = point || [0, 0];
point = shapeAsPoint(point);
var b = this.bounds;
bPoints = [b.topLeft, b.topRight, b.topCenter,
b.leftCenter.subtract([5,0]), b.bottomLeft,
b.bottomRight, b.bottomCenter,
b.rightCenter.add([5,0])];
bDists = bPoints.map(function(point2) {
return point.getDistance(point2)
});
bDistMin = Math.min.apply(null, bDists);
return bPoints[bDists.indexOf(bDistMin)];
}
return this.label;
}
function createPathGroup(start, end) {
// Factory function to plot a line Path with a second arrowhead Path at the end of the line.
// Returns a Group object containing line and arrowhead Paths.
var start = start || [0, 0];
var end = end || [0, 0];
start = shapeAsPoint(start);
end = shapeAsPoint(end);
var path = new Path(start, end);
var arrowVector = end.subtract(start).normalize(10);
var arrowPath = new Path(end.add(arrowVector.rotate(160)), end,
end.add(arrowVector.rotate(-160)));
var pathGroup = new Group([path, arrowPath]);
pathGroup.strokeColor = 'white';
pathGroup.strokeWidth = 3;
pathGroup.name = 'pathGroup';
pathGroup.firstChild.name = 'path';
pathGroup.lastChild.name = 'arrow';
pathGroup.shadowColor = 'black';
pathGroup.shadowBlur = 4;
return pathGroup;
}
function labelPath(labelContent, labelPoint, pathPoint) {
// Constructor for linked paper.js text label and path objects
// Object scope variable so child objects can access parent methods
var self = this;
this.initArrowPath = function() {
// Returns initial path with arrowhead as Group object of Path objects
return createPathGroup(this.label.nearestLabelBound(pathPoint),
pathPoint);
}
this.newArrowPath = function(start, end) {
// Replaces previous ArrowPath with new ArrowPath using start and end points
this.group.removeChildren(1);
this.pathGroup = createPathGroup(start, end);
this.group.addChild(self.pathGroup);
}
this.initGroup = function() {
// Returns initial group including label PointText and path Group.
// This group allows access to both label and path objects from UI drag
// methods when either label or path object are selected from UI.
group = new Group([this.label, this.pathGroup]);
group.updateArrowPath = function(start, end) {
// Allows updating of path from the group (for UI drag methods).
self.newArrowPath(start, end);
}
return group;
}
// Constructor
var labelPoint = labelPoint || [0, 0];
var pathPoint = pathPoint || [0, 0];
pathPoint = shapeAsPoint(pathPoint);
this.label = createLabel(labelPoint, labelContent);
this.pathGroup = this.initArrowPath();
this.group = this.initGroup();
}
function uiDrag(tool) {
// Provides paperjs UI drag methods
var selectBox;
var hitOptions = {
segments: true,
stroke: true,
fill: true,
tolerance: 5
};
tool.onMouseDown = function(event) {
// Sets variables based on UI item clicked
project.activeLayer.selected = false;
this.item = null;
this.segment = null;
var hitResult = project.hitTest(event.point, hitOptions);
if (!hitResult)
return;
this.item = hitResult.item
if (hitResult.type == 'fill') {
this.labelPath = this.item.parent;
this.label = this.item;
this.pathGroup = this.labelPath.children["pathGroup"];
this.pathEnd = this.pathGroup.children["path"].getPointAt(this.pathGroup.children["path"].length);
this.label.box.selected = true;
} else if (hitResult.type == 'segment' || hitResult.type == 'stroke') {
if (this.item.name == 'selectBox') {
this.item.selected = true;
this.segment = hitResult.segment;
} else {
this.labelPath = this.item.parent.parent;
this.label = this.labelPath.children["label"];
this.pathGroup = this.item.parent;
this.pathEnd = this.pathGroup.children["path"].getPointAt(this.pathGroup.children["path"].length);
this.pathGroup.selected = true;
}
}
this.mouseStart = event.point;
}
tool.onMouseDrag = function(event) {
// If Path clicked, dragging moves Path. If label PointText clicked,
// dragging moves label and Path.
if (this.item instanceof Path) {
if (this.item.name == 'selectBox') {
this.item.shiftAnchor(this.segment, event.delta);
this.labelPath.updateArrowPath(
this.label.nearestLabelBound(this.pathEnd), this.pathEnd);
} else {
var delta = event.point.subtract(this.mouseStart);
var newEnd = this.pathEnd.add(delta);
this.labelPath.updateArrowPath(
this.label.nearestLabelBound(newEnd), newEnd);
this.labelPath.children["pathGroup"].selected = true;
}
} else if (this.item instanceof PointText) {
this.label.position = this.label.position.add(event.delta);
this.label.box.position = this.label.box.position.add(event.delta);
this.labelPath.updateArrowPath(
this.label.nearestLabelBound(this.pathEnd), this.pathEnd);
} else {
this.item.position = this.item.position.add(event.delta);
}
}
tool.onMouseUp = function() {
// Unselected UI object.
if (this.item instanceof Path && this.item.name != 'selectBox') { this.labelPath.selected = false; }
}
}