Cannonball and Slingshot - The Essential Guide to HTML5 - page 120

Code Explanation

var cheight = 400;

var ctx;

var everything = [];

var tid;

var horvelocity;

var verticalvel1;

var verticalvel2;

var gravity = 2;

var cannonx = 10;

x location of cannon

var cannony = 280; y location of cannon

var cannonlength = 200;

Cannon length (i.e., width)

var cannonht = 20; Cannon height

var ballrad = 10;

var targetx = 500; x position of target

var targety = 50; y position of target

var targetw = 85;

Target width

var targeth = 280; Target height

var htargetx = 450; x position of the hit target

var htargety = 220;

y position of the hit target

var htargetw = 355; Hit target width

var htargeth = 96;

Hit target height