CFObjective, CodeWars and Velociraptors

Last night at CFObjective ANZ, Gert Franz and I were invited to the CodeWar hosted by Robin from RocketBoots. I have to say it was a great event at the European Beer Cafe in Melbourne, and the Railo "Flower Power" team managed, somehow, even with jetlag and lots of beers, to win (pure luck I have to say!).

The CodeWar is a series of challenges where teams went against each other to complete a range of coding challanges in 20 minute rounds.

One of the rounds, in which we didn't compete, was the ability to find out which Velociraptors would survive if they were tied to a pole and were trying to mate. The awesome description of the challenge was:

VELOCIRAPTORS run Amok A large arena (1 square km) has 24 Vulcan Velociraptors, each chained to a post.
Each is severely afflicted with Pon farr.
Which is the lonely Velociraptor that is destined to die? and which is the lucky Velociraptor that will make a spectator outside the arena very unhappy?

Since we weren't involved in that challenge, I really wanted to give the solution a go, so here is my solution.

First of we have a list of Velociraptors:

[ ['Alice',51.5,940.5,945.5], ['Arthur',73.5,769.5,803.5], ['Bertha',112,593,844], ['Bessie',62,852,769], ['Charles',37,224,144], ['Clara',70,168,832], ['Edward',171.5,120.5,535.5], ['Elizabeth',83,199,235], ['Emma',67.5,298.5,576.5], ['Ethel',27,417,449], ['Florence',47.5,369.5,386.5], ['Frank',118.5,825.5,185.5], ['Fred',31.5,920.5,875.5], ['George',52.5,109.5,106.5], ['Harry',97,210,701], ['Helen',41,194,85], ['Henry',127,473,603], ['Joseph',144,490,211], ['Marie',157,742,541], ['Minnie',17,402,431], ['Robert',66.5,398.5,784.5], ['Ruth',130.5,656.5,282.5], ['Thomas',64,140,894], ['Walter',39.5,468.5,868.5] ]

The above is an array of arrays, with each individual array standing for a velociraptor, with it's name, radius of his chain, and their x and y location on the map. So that we can see where they all are and their reach, I decided to use the HTML5 Canvass tag. Here is the simple page with the canvass:

<!DOCTYPE html> <html lang="en"> <head> The Lonely Raptors </head> <body> </body> </html>

Next I, did a function that allowed me to display each of the velociraptors as a circle:

var drawingCanvas = document.getElementById('myRaptors'); if(drawingCanvas.getContext) \{ var context = drawingCanvas.getContext('2d'); } function drawCircle(context, radius, x, y, name)\{ context.strokeStyle = "#000000"; //Set the stroke context.fillStyle = "#" + (x*8).toString(16); //set a random colour for each circle context.globalAlpha = 0.5; //make it nicely transparent //Draw the circle context.beginPath(); context.arc(x,y,radius,0,Math.PI*2,true); context.closePath(); context.stroke(); context.fill();

			//reset the colour and the transparency and then fill in the name
			context.globalAlpha = 1;		
			context.textAlign = "center";
			context.textBaseline = "middle";		
			context.fillStyle = "#000000";
			context.fillText(name, x, y);
	}

</code>

Then I loaded the velociraptor array and called the function to draw a circle:

raptors = Evaluate(FileRead("Velociraptors.txt")); for(r in raptors)\{ WriteOutput("drawCircle(context, #r[2]#, #r[3]#, #r[4]#, '#r[1]#');"); }

And finally, this is the result:

So we can see that the Velociraptor that will die of lonelyness is Robert as he has no overlap with any other 'raptor and that Edward will be having a tasty treat in the form of a visitor outside the enclosure!
You have to love HTML5 for being able to do these things so easily!