CHAPTER 4
Code Explanation
var cheight = 600;
var ctx;
var canvas1;
var everything = [];
var tid;
var startrockx = 100; Starting position x
var startrocky = 240; Starting position y
var ballx = startrockx; Set ballx
var bally = startrocky; Set bally
var ballrad = 10;
var ballradsq = ballrad*ballrad; Save this value
var inmotion = false;
var horvelocity;
var verticalvel1;
var verticalvel2;
var gravity = 2;
var chicken = new Image(); Name of original target
chicken.src = "chicken.jpg"; Set image file
var feathers = new Image(); Name of hit target
feathers.src = "feathers.gif"; Set image file
function Sling(bx,by,s1x,s1y,s2x,s2y,
s3x,s3y,stylestring) {
Function defining a slingshot based on the four
points plus a color