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var latest_output_area ="NONE"; // Jquery object for the DOM element of output area which was used most recently

function handle_output(out, block){

var output = out.content.data["text/html"];

latest_output_area.html(output);

}

function polygon_complete(canvas, vertices){

latest_output_area = $(canvas).parents('.output_subarea');

var world_object_name = canvas.dataset.world_name;

var command = world_object_name + ".handle_add_obstacle(" + JSON.stringify(vertices) + ")";

console.log("Executing Command: " + command);

var kernel = IPython.notebook.kernel;

var callbacks = { 'iopub' : {'output' : handle_output}};

kernel.execute(command,callbacks);

}

var canvas , ctx;

function drawPolygon(array) {

ctx.fillStyle = '#f00';

ctx.beginPath();

ctx.moveTo(array[0][0],array[0][1]);

for(var i = 1;i<array.length;++i)

{

ctx.lineTo(array[i][0], array[i][1]);

}

ctx.closePath();

ctx.fill();

}

var pArray = new Array();

function getPosition(obj,event) {

canvas = obj;

ctx = canvas.getContext('2d');

var x = new Number();

var y = new Number();

x = event.pageX;

y = event.pageY;

x -= $(canvas).offset().left;

y -= $(canvas).offset().top;

drawPoint(x,y);

//draw dot

if(pArray.length>1)

{

drawPoint(pArray[0][0],pArray[0][1]);

}

//check overlap

if(ctx.isPointInPath(x, y) && (pArray.length>1)) {

//Do something

drawPolygon(pArray);

polygon_complete(canvas,pArray);

}

else {

var point = new Array();

point.push(x,y);

pArray.push(point);

}

}

function drawPoint(x, y) {

ctx.beginPath();

ctx.arc(x, y, 5, 0, Math.PI*2);

ctx.fillStyle = '#00f';

ctx.fill();

ctx.closePath();

}

function initalizeObstacles(objects) {

canvas = $('canvas.main-robo-world').get(0);

ctx = canvas.getContext('2d');

$('canvas.main-robo-world').removeClass('main-robo-world');

for(var i=0;i<objects.length;++i) {

drawPolygon(objects[i]);

}

pArray.length = 0;

}

initalizeObstacles(all_polygons);