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<!DOCTYPE html>
<html>
<head>
<title>Test geometry functions</title>
</script>
</head>
<body>
<div id="status">Running...</div>
<script src="geometry.js"></script>
<script>
var asserts = 0;
function assertEqual(a, b) {
var ok = true;
if (typeof a == 'number' && typeof b == 'number') {
if (isNaN(a) != isNaN(b)) {
ok = false;
} else if (Math.abs(a - b) > 1e-10) {
ok = false;
}
} else {
ok = (a === b);
}
if (!ok) {
var msg = "Assertion failure: '"
+ a + "' !== '"
+ b + "'";
setStatus(msg);
throw new Error(msg);
}
asserts++;
}
function setStatus(status) {
document.getElementById('status').innerHTML = status;
}
function checkEndpoints(line) {
if (line.y1 !== line.y2) {
assertEqual(line.y(line.x1), line.y1);
assertEqual(line.y(line.x2), line.y2);
}
if (line.x1 !== line.x2) {
assertEqual(line.x(line.y1), line.x1);
assertEqual(line.x(line.y2), line.x2);
}
}
var line1 = new geo.LineSegment(1, 1, 2, 3),
line2 = new geo.LineSegment(1, 2, 5, 0),
line3 = new geo.LineSegment(2, 3, 5, 9),
line4 = new geo.LineSegment(1.5, 2, 1.5, 3);
line5 = new geo.LineSegment(2, 1, 5, 1);
checkEndpoints(line1);
checkEndpoints(line2);
var i12 = line1.intersect(line2),
i21 = line2.intersect(line1),
i13 = line1.intersect(line3),
i23 = line2.intersect(line3),
i32 = line3.intersect(line2),
i14 = line1.intersect(line4),
i15 = line1.intersect(line5),
i45 = line4.intersect(line5);
assertEqual(i12.x, 1.4);
assertEqual(i12.y, 1.8);
assertEqual(i12.in1, true);
assertEqual(i12.in2, true);
assertEqual(i21.x, 1.4);
assertEqual(i21.y, 1.8);
assertEqual(i21.in1, true);
assertEqual(i21.in2, true);
assertEqual(i13.x, NaN);
assertEqual(i13.y, NaN);
assertEqual(i23.x, 1.4);
assertEqual(i23.y, 1.8);
assertEqual(i23.in1, true);
assertEqual(i23.in2, false);
assertEqual(i32.x, 1.4);
assertEqual(i32.y, 1.8);
assertEqual(i32.in1, false);
assertEqual(i32.in2, true);
assertEqual(i14.x, 1.5);
assertEqual(i14.y, 2);
assertEqual(i14.in1, true);
assertEqual(i14.in2, true);
assertEqual(i15.x, 1);
assertEqual(i15.y, 1);
assertEqual(i15.in1, true);
assertEqual(i15.in2, false);
assertEqual(i45.x, 1.5);
assertEqual(i45.y, 1);
assertEqual(i45.in1, false);
assertEqual(i45.in2, false);
setStatus(asserts + ' tests OK');
</script>
</body>
</html>
|
