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//
// main.js
//
// A project template for using arbor.js
//
(function($){
var Renderer = function(canvas){
var canvas = $(canvas).get(0)
var ctx = canvas.getContext("2d");
var particleSystem
var that = {
init:function(system){
//
// the particle system will call the init function once, right before the
// first frame is to be drawn. it's a good place to set up the canvas and
// to pass the canvas size to the particle system
//
// save a reference to the particle system for use in the .redraw() loop
particleSystem = system
// inform the system of the screen dimensions so it can map coords for us.
// if the canvas is ever resized, screenSize should be called again with
// the new dimensions
particleSystem.screenSize(canvas.width, canvas.height)
particleSystem.screenPadding(50) // leave an extra 80px of whitespace per side
// set up some event handlers to allow for node-dragging
that.initMouseHandling()
},
redraw:function(){
//
// redraw will be called repeatedly during the run whenever the node positions
// change. the new positions for the nodes can be accessed by looking at the
// .p attribute of a given node. however the p.x & p.y values are in the coordinates
// of the particle system rather than the screen. you can either map them to
// the screen yourself, or use the convenience iterators .eachNode (and .eachEdge)
// which allow you to step through the actual node objects but also pass an
// x,y point in the screen's coordinate system
//
ctx.fillStyle = "white"
ctx.fillRect(0,0, canvas.width, canvas.height)
// JESTEM BOGIEM PRZEKSZTAŁCEŃ 2D :O
var drawArrow = function(pt1, pt2, length, style) {
var angle = Math.atan2(pt2.y - pt1.y, pt2.x - pt1.x);
ctx.fillStyle = style;
ctx.setLineDash([]);
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(pt2.x, pt2.y);
ctx.lineTo(pt2.x - length * Math.cos(angle - Math.PI/6), pt2.y - length * Math.sin(angle - Math.PI/6));
ctx.lineTo(pt2.x - length * (Math.cos(angle + Math.PI/6) + Math.cos(angle - Math.PI/6))/3,
pt2.y - length * (Math.sin(angle - Math.PI/6) + Math.sin(angle + Math.PI/6))/3);
ctx.lineTo(pt2.x - length * Math.cos(angle + Math.PI/6), pt2.y - length * Math.sin(angle + Math.PI/6));
ctx.lineTo(pt2.x, pt2.y);
ctx.stroke();
ctx.fill();
}
particleSystem.eachEdge(function(edge, pt1, pt2){
// edge: {source:Node, target:Node, length:#, data:{}}
// pt1: {x:#, y:#} source position in screen coords
// pt2: {x:#, y:#} target position in screen coords
ctx.strokeStyle = edge.data.style || "rgba(0,0,0, .333)"
ctx.lineWidth = edge.data.width || 1
ctx.setLineDash(edge.data.dash || [])
// draw a line from pt1 to pt2
ctx.beginPath()
ctx.moveTo(pt1.x, pt1.y)
if (edge.data.arrow) {
if (edge.target.data.imageObject) {
var destination = {};
var intersectingSegment = undefined;
if (pt1.x != pt2.x) {
var lineSlope = (pt1.y - pt2.y) / (pt1.x - pt2.x);
var width = edge.target.data.imageObject.width;
var height = edge.target.data.imageObject.height;
if ((-height / 2 <= lineSlope * width / 2)
&& (lineSlope * width / 2 <= height / 2)) {
if (pt1.x > pt2.x) {
intersectingSegment = [
{ x: pt2.x + width / 2,
y: pt2.y - height / 2 },
{ x: pt2.x + width / 2,
y: pt2.y + height / 2 }
];
}
else {
intersectingSegment = [
{ x: pt2.x - width / 2,
y: pt2.y - height / 2 },
{ x: pt2.x - width / 2,
y: pt2.y + height / 2 }
];
}
}
if ((-width / 2 <= (height / 2) / lineSlope)
&& ((height / 2) / lineSlope <= width / 2)) {
if (pt1.y > pt2.y) {
intersectingSegment = [
{ x: pt2.x - width / 2,
y: pt2.y + height / 2 },
{ x: pt2.x + width / 2,
y: pt2.y + height / 2 }
];
}
else {
intersectingSegment = [
{ x: pt2.x - width / 2,
y: pt2.y - height / 2 },
{ x: pt2.x + width / 2,
y: pt2.y - height / 2 }
];
}
}
}
else {
intersectingSegment = (pt1.y > pt2.y) ? [
{ x: pt2.x - width / 2,
y: pt2.y - height / 2 },
{ x: pt2.x + width / 2,
y: pt2.y - height / 2 }
] : [
{ x: pt2.x - width / 2,
y: pt2.y + height / 2 },
{ x: pt2.x + width / 2,
y: pt2.y + height / 2 }
];
}
if (intersectingSegment) {
var intersectAngle = ((intersectingSegment[1].y - intersectingSegment[0].y) * (pt2.x - pt1.x))
- ((intersectingSegment[1].x - intersectingSegment[0].x) * (pt2.y - pt1.y));
var aSlope = pt1.y - intersectingSegment[0].y;
var bSlope = pt1.x - intersectingSegment[0].x;
var numerator1 = ((intersectingSegment[1].x - intersectingSegment[0].x) * aSlope)
- ((intersectingSegment[1].y - intersectingSegment[0].y) * bSlope);
var intersectSlope = numerator1 / intersectAngle;
destination = { x: pt1.x + (intersectSlope * (pt2.x - pt1.x)),
y: pt1.y + (intersectSlope * (pt2.y - pt1.y)) };
}
}
}
if (destination) {
pt2 = destination;
}
ctx.lineTo(pt2.x, pt2.y);
ctx.stroke();
if (edge.data.arrow) {
drawArrow(pt1, pt2, edge.data.arrow, ctx.strokeStyle);
}
})
var drawImage = function(image, coords) {
if (!image.height) {
image.height = image.width ? image.width * image.naturalHeight / image.naturalWidth : image.naturalHeight;
}
if (!image.width) {
image.width = image.height ? image.height * image.naturalWidth / image.naturalHeight : image.naturalWidth;
}
ctx.drawImage(image,
coords.x - image.width / 2,
coords.y - image.height / 2,
image.width,
image.height);
};
particleSystem.eachNode(function(node, pt){
// node: {mass:#, p:{x,y}, name:"", data:{}}
// pt: {x:#, y:#} node position in screen coords
if (node.data.imageObject) {
drawImage(node.data.imageObject, pt);
}
else {
var img = new Image(node.data.width, node.data.height);
img.onload = function() {
node.data.imageObject = img;
drawImage(node.data.imageObject, pt);
};
img.src = '_img/' + node.data.image;
}
})
},
initMouseHandling:function(){
// no-nonsense drag and drop (thanks springy.js)
var dragged = null;
// set up a handler object that will initially listen for mousedowns then
// for moves and mouseups while dragging
var handler = {
clicked:function(e){
var pos = $(canvas).offset();
_mouseP = arbor.Point(e.pageX-pos.left, e.pageY-pos.top)
dragged = particleSystem.nearest(_mouseP);
if (dragged && dragged.node !== null){
// while we're dragging, don't let physics move the node
dragged.node.fixed = true
}
$(canvas).bind('mousemove', handler.dragged)
$(window).bind('mouseup', handler.dropped)
return false
},
dragged:function(e){
var pos = $(canvas).offset();
var s = arbor.Point(e.pageX-pos.left, e.pageY-pos.top)
if (dragged && dragged.node !== null){
var p = particleSystem.fromScreen(s)
dragged.node.p = p
}
return false
},
dropped:function(e){
if (dragged===null || dragged.node===undefined) return
if (dragged.node !== null) dragged.node.fixed = false
dragged.node.tempMass = 1000
dragged = null
$(canvas).unbind('mousemove', handler.dragged)
$(window).unbind('mouseup', handler.dropped)
_mouseP = null
return false
}
}
// start listening
$(canvas).mousedown(handler.clicked);
},
}
return that
}
$(document).ready(function() {
$.getJSON('graph.json', function(graph) {
graph.repulsion = graph.repulsion || 1000;
graph.stiffness = graph.stiffness || 600;
graph.friction = graph.friction || 0.5;
var sys = arbor.ParticleSystem(graph.repulsion, graph.stiffness, graph.friction); // create the system with sensible repulsion/stiffness/friction
sys.parameters({gravity:true}); // use center-gravity to make the graph settle nicely (ymmv)
sys.renderer = Renderer("#viewport"); // our newly created renderer will have its .init() method called shortly by sys...
sys.graft(graph);
});
})
})(this.jQuery)
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