Head-First-JavaScript-Programming/chapter3/areaAndDistance.html at master · dinh/Head-First-JavaScript-Programming

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<!doctype html>

<head>

<title>Area and Distance</title>

</head>

<body>

</body>

var x = 32;

var y = 44;

var radius = 5;

var centerX = 0;

var centerY = 0;

var width = 600;

var height = 400;

function setup(width, height) {

centerX = width/2;

centerY = height/2;

}

function computeDistance(x1, y1, x2, y2) {

var dx = x1 - x2;

var dy = y1 - y2;

var d2 = (dx * dx) + (dy * dy);

var d = Math.sqrt(d2);

return d;

}

function circleArea(r) {

var area = Math.PI * r * r;

return area;

}

setup(width, height);

var area = circleArea(radius);

var distance = computeDistance(x, y, centerX, centerY);

alert("Area: " + area);

alert("Distance: " + distance);

</script>

</body>

</html>

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