mxArrow.js
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/**
* Copyright (c) 2006-2015, JGraph Ltd
* Copyright (c) 2006-2015, Gaudenz Alder
*/
/**
* Class: mxArrow
*
* Extends <mxShape> to implement an arrow shape. (The shape
* is used to represent edges, not vertices.)
* This shape is registered under <mxConstants.SHAPE_ARROW>
* in <mxCellRenderer>.
*
* Constructor: mxArrow
*
* Constructs a new arrow shape.
*
* Parameters:
*
* points - Array of <mxPoints> that define the points. This is stored in
* <mxShape.points>.
* fill - String that defines the fill color. This is stored in <fill>.
* stroke - String that defines the stroke color. This is stored in <stroke>.
* strokewidth - Optional integer that defines the stroke width. Default is
* 1. This is stored in <strokewidth>.
* arrowWidth - Optional integer that defines the arrow width. Default is
* <mxConstants.ARROW_WIDTH>. This is stored in <arrowWidth>.
* spacing - Optional integer that defines the spacing between the arrow shape
* and its endpoints. Default is <mxConstants.ARROW_SPACING>. This is stored in
* <spacing>.
* endSize - Optional integer that defines the size of the arrowhead. Default
* is <mxConstants.ARROW_SIZE>. This is stored in <endSize>.
*/
function mxArrow(points, fill, stroke, strokewidth, arrowWidth, spacing, endSize)
{
mxShape.call(this);
this.points = points;
this.fill = fill;
this.stroke = stroke;
this.strokewidth = (strokewidth != null) ? strokewidth : 1;
this.arrowWidth = (arrowWidth != null) ? arrowWidth : mxConstants.ARROW_WIDTH;
this.spacing = (spacing != null) ? spacing : mxConstants.ARROW_SPACING;
this.endSize = (endSize != null) ? endSize : mxConstants.ARROW_SIZE;
};
/**
* Extends mxShape.
*/
mxUtils.extend(mxArrow, mxShape);
/**
* Function: augmentBoundingBox
*
* Augments the bounding box with the edge width and markers.
*/
mxArrow.prototype.augmentBoundingBox = function(bbox)
{
mxShape.prototype.augmentBoundingBox.apply(this, arguments);
var w = Math.max(this.arrowWidth, this.endSize);
bbox.grow((w / 2 + this.strokewidth) * this.scale);
};
/**
* Function: paintEdgeShape
*
* Paints the line shape.
*/
mxArrow.prototype.paintEdgeShape = function(c, pts)
{
// Geometry of arrow
var spacing = mxConstants.ARROW_SPACING;
var width = mxConstants.ARROW_WIDTH;
var arrow = mxConstants.ARROW_SIZE;
// Base vector (between end points)
var p0 = pts[0];
var pe = pts[pts.length - 1];
var dx = pe.x - p0.x;
var dy = pe.y - p0.y;
var dist = Math.sqrt(dx * dx + dy * dy);
var length = dist - 2 * spacing - arrow;
// Computes the norm and the inverse norm
var nx = dx / dist;
var ny = dy / dist;
var basex = length * nx;
var basey = length * ny;
var floorx = width * ny/3;
var floory = -width * nx/3;
// Computes points
var p0x = p0.x - floorx / 2 + spacing * nx;
var p0y = p0.y - floory / 2 + spacing * ny;
var p1x = p0x + floorx;
var p1y = p0y + floory;
var p2x = p1x + basex;
var p2y = p1y + basey;
var p3x = p2x + floorx;
var p3y = p2y + floory;
// p4 not necessary
var p5x = p3x - 3 * floorx;
var p5y = p3y - 3 * floory;
c.begin();
c.moveTo(p0x, p0y);
c.lineTo(p1x, p1y);
c.lineTo(p2x, p2y);
c.lineTo(p3x, p3y);
c.lineTo(pe.x - spacing * nx, pe.y - spacing * ny);
c.lineTo(p5x, p5y);
c.lineTo(p5x + floorx, p5y + floory);
c.close();
c.fillAndStroke();
};