var Item = require('burner').Item,
Utils = require('burner').Utils,
Vector = require('burner').Vector;
/**
* Creates a new Connector.
*
* Connectors render a straight line between two Flora items. The Connector carries
* a reference to the two items as parentA and parentB. If the parent items move,
* the Connector moves with them.
*
* @constructor
* @extends Item
*/
function Connector() {
Item.call(this);
}
Utils.extend(Connector, Item);
/**
* @param {Object} options A map of initial properties.
* @param {Object} parentA The object that starts the connection.
* @param {Object} parentB The object that ends the connection.
* @param {number} [options.zIndex = 0] zIndex.
* @param {string} [options.borderStyle = 'dotted'] Border style.
* @param {Array} [options.borderColor = 150, 150, 150] Border color.
*/
Connector.prototype.init = function(world, options) {
Connector._superClass.init.call(this, world, options);
if (!options || !options.parentA || !options.parentB) {
throw new Error('Connector: both parentA and parentB are required.');
}
this.parentA = options.parentA;
this.parentB = options.parentB;
this.zIndex = options.zIndex || 0;
this.borderStyle = options.borderStyle || 'dotted';
this.borderColor = options.borderColor || [150, 150, 150];
/**
* Connectors have no height or color and rely on the associated DOM element's
* CSS border to render their line.
*/
this.borderWidth = 1;
this.borderRadius = 0;
this.height = 0;
this.color = 'transparent';
};
/**
* Called every frame, step() updates the instance's properties.
*/
Connector.prototype.step = function() {
var a = this.parentA.location,
b = this.parentB.location;
this.width = Math.floor(Vector.VectorSub(this.parentA.location,
this.parentB.location).mag());
this.location = Vector.VectorAdd(this.parentA.location,
this.parentB.location).div(2); // midpoint = (v1 + v2)/2
this.angle = Utils.radiansToDegrees(Math.atan2(b.y - a.y, b.x - a.x) );
};
/**
* Updates the corresponding DOM element's style property.
* @function draw
* @memberof Connector
*/
Connector.prototype.draw = function() {
var cssText = this.getCSSText({
x: this.location.x - (this.width / 2),
y: this.location.y - (this.height / 2),
angle: this.angle,
scale: this.scale || 1,
width: this.width,
height: this.height,
color0: this.color[0],
color1: this.color[1],
color2: this.color[2],
colorMode: this.colorMode,
borderRadius: this.borderRadius,
borderWidth: this.borderWidth,
borderStyle: this.borderStyle,
borderColor0: this.borderColor[0],
borderColor1: this.borderColor[1],
borderColor2: this.borderColor[2],
visibility: this.visibility
});
this.el.style.cssText = cssText;
};
/**
* Concatenates a new cssText string.
*
* @function getCSSText
* @memberof Connector
* @param {Object} props A map of object properties.
* @returns {string} A string representing cssText.
*/
Connector.prototype.getCSSText = function(props) {
return Item._stylePosition.replace(/<x>/g, props.x).replace(/<y>/g, props.y).replace(/<angle>/g, props.angle).replace(/<scale>/g, props.scale) + 'width: ' +
props.width + 'px; height: ' + props.height + 'px; background-color: ' +
props.colorMode + '(' + props.color0 + ', ' + props.color1 + (props.colorMode === 'hsl' ? '%' : '') + ', ' + props.color2 + (props.colorMode === 'hsl' ? '%' : '') +'); border: ' +
props.borderWidth + 'px ' + props.borderStyle + ' ' + props.colorMode + '(' + props.borderColor0 + ', ' + props.borderColor1 + (props.colorMode === 'hsl' ? '%' : '') + ', ' + props.borderColor2 + (props.colorMode === 'hsl' ? '%' : '') + '); border-radius: ' +
props.borderRadius + '%; visibility: ' + props.visibility + ';';
};
module.exports = Connector;