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<html>
<head>
<script src="../OLLoader.js"></script>
<script type="text/javascript">
var line;
var components = [new OpenLayers.Geometry.Point(10,10),
new OpenLayers.Geometry.Point(0,0)];
function test_LinearRing_constructor (t) {
t.plan( 6 );
//null
ring = new OpenLayers.Geometry.LinearRing();
t.ok( ring instanceof OpenLayers.Geometry.LinearRing, "new OpenLayers.Geometry.LinearRing returns ring object" );
t.eq( ring.CLASS_NAME, "OpenLayers.Geometry.LinearRing", "ring.CLASS_NAME is set correctly");
t.eq( ring.components, [], "ring.components is set correctly");
//valid components
ring = new OpenLayers.Geometry.LinearRing(components);
t.ok( ring instanceof OpenLayers.Geometry.LinearRing, "new OpenLayers.Geometry.LinearRing returns ring object" );
t.eq( ring.CLASS_NAME, "OpenLayers.Geometry.LinearRing", "ring.CLASS_NAME is set correctly");
t.eq( ring.components.length, 3, "ring.components.length is set correctly");
}
function test_LinearRing_addComponent(t) {
t.plan(13);
var ring = new OpenLayers.Geometry.LinearRing();
var point = new OpenLayers.Geometry.Point(0,0);
t.ok(ring.addComponent(point),
"addComponent returns true for 1st point");
t.eq(ring.components.length, 2, "add first point, correct length");
t.ok(ring.components[0].equals(point), "point one correct");
t.ok(ring.components[0] === ring.components[ring.components.length - 1],
"first and last point are the same");
newPoint = new OpenLayers.Geometry.Point(10,10);
t.ok(ring.addComponent( newPoint ),
"addComponent returns true for unique point");
t.eq(ring.components.length, 3, "correctly adds 3rd point");
t.ok(ring.components[0].equals(point), "point one correct");
t.ok(ring.components[1].equals(newPoint), "point one correct");
t.ok(ring.components[0] === ring.components[ring.components.length - 1],
"first and last point are the same");
var length = ring.components.length;
var clone = ring.components[length - 1].clone();
t.ok(!ring.addComponent(clone),
"addComponent returns false for adding a duplicate last point");
t.eq(ring.components.length, length,
"components remains unchanged after trying to add duplicate point");
t.ok(ring.addComponent(clone, length - 1),
"addComponent returns true when adding a duplicate with an index");
t.eq(ring.components.length, length + 1,
"components increase in length after adding a duplicate point with index");
}
function test_LinearRing_removeComponent(t) {
t.plan(10);
var components = [new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(0,10),
new OpenLayers.Geometry.Point(15,15),
new OpenLayers.Geometry.Point(10,0)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
ring.removeComponent( ring.components[2] );
t.eq(ring.components.length, 4, "removing from linear ring with 5 points: length ok");
t.ok(ring.components[0].equals(components[0]), "point one correct");
t.ok(ring.components[1].equals(components[1]), "point two correct");
t.ok(ring.components[2].equals(components[3]), "point three correct");
t.ok(ring.components[0] === ring.components[ring.components.length - 1],
"first and last point are the same");
var testBounds = new OpenLayers.Bounds(0,0,10,10);
var ringBounds = ring.getBounds();
t.ok(ringBounds.equals(testBounds), "bounds correctly recalculated");
ring.removeComponent( ring.components[2] );
ring.removeComponent( ring.components[1] );
t.eq(ring.components.length, 3, "cant remove from linear ring with only 3 points. new length ok");
t.ok(ring.components[0].equals(components[0]), "point one correct");
t.ok(ring.components[1].equals(components[1]), "point two correct");
t.ok(ring.components[0] === ring.components[ring.components.length - 1],
"first and last point are the same");
}
function test_LinearRing_getArea(t) {
t.plan(1);
var components = [new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(0,10),
new OpenLayers.Geometry.Point(10,10),
new OpenLayers.Geometry.Point(10,0)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
t.eq(ring.getArea(), 100, "getArea works lovely");
}
function test_LinearRing_getLength(t) {
t.plan(1);
var components = [
new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(0,10),
new OpenLayers.Geometry.Point(10,10),
new OpenLayers.Geometry.Point(10,0)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
t.eq(ring.getLength(), 40, "getLength returns the correct perimiter");
}
function test_LinearRing_getCentroid(t) {
t.plan(2);
var components = [
new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(0,10),
new OpenLayers.Geometry.Point(10,10),
new OpenLayers.Geometry.Point(10,0)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
var centroid = ring.getCentroid();
t.ok(centroid.x === 5 && centroid.y === 5, "getCentroid returns the correct centroid");
ring.destroy();
ring = new OpenLayers.Geometry.LinearRing();
t.eq(ring.getCentroid(), null, "getCentroid returns null if no components");
}
function test_LinearRing_move(t) {
var nvert = 4,
x = new Array(nvert),
y = new Array(nvert),
components = new Array(nvert);
t.plan(2 * (nvert + 1));
for(var i=0; i<nvert; ++i) {
x[i] = Math.random();
y[i] = Math.random();
components[i] = new OpenLayers.Geometry.Point(x[i], y[i]);
}
x.push(x[0]);
y.push(y[0]);
var ring = new OpenLayers.Geometry.LinearRing(components);
var dx = Math.random();
var dy = Math.random();
ring.move(dx, dy);
for(var j=0; j<nvert + 1; ++j) {
t.eq(ring.components[j].x, x[j] + dx,
"move correctly adjust x coord of " + j + " component");
t.eq(ring.components[j].y, y[j] + dy,
"move correctly adjust y coord of " + j + " component");
}
}
function test_LinearRing_rotate(t) {
t.plan(10);
var components = [
new OpenLayers.Geometry.Point(10,10),
new OpenLayers.Geometry.Point(11,10),
new OpenLayers.Geometry.Point(11,11),
new OpenLayers.Geometry.Point(10,11)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
// rotate a quarter turn around the origin
var origin = new OpenLayers.Geometry.Point(0, 0);
var angle = 90;
ring.rotate(angle, origin);
function withinTolerance(i, j) {
return Math.abs(i - j) < 1e-9;
}
t.ok(withinTolerance(ring.components[0].x , -10),
"rotate correctly adjusts x of component 0");
t.ok(withinTolerance(ring.components[0].y, 10),
"rotate correctly adjusts y of component 0");
t.ok(withinTolerance(ring.components[1].x, -10),
"rotate correctly adjusts x of component 1");
t.ok(withinTolerance(ring.components[1].y, 11),
"rotate correctly adjusts y of component 1");
t.ok(withinTolerance(ring.components[2].x, -11),
"rotate correctly adjusts x of component 2");
t.ok(withinTolerance(ring.components[2].y, 11),
"rotate correctly adjusts y of component 2");
t.ok(withinTolerance(ring.components[3].x, -11),
"rotate correctly adjusts x of component 3");
t.ok(withinTolerance(ring.components[3].y, 10),
"rotate correctly adjusts y of component 3");
t.ok(withinTolerance(ring.components[4].x, -10),
"rotate correctly adjusts x of component 4");
t.ok(withinTolerance(ring.components[4].y, 10),
"rotate correctly adjusts y of component 4");
}
function test_LinearRing_resize(t) {
t.plan(10);
var components = [
new OpenLayers.Geometry.Point(10,10),
new OpenLayers.Geometry.Point(11,10),
new OpenLayers.Geometry.Point(11,11),
new OpenLayers.Geometry.Point(10,11)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
// rotate a quarter turn around the origin
var origin = new OpenLayers.Geometry.Point(0, 0);
var scale = Math.random();
ring.resize(scale, origin);
function withinTolerance(i, j) {
return Math.abs(i - j) < 1e-9;
}
t.ok(withinTolerance(ring.components[0].x , 10 * scale),
"resize correctly adjusts x of component 0");
t.ok(withinTolerance(ring.components[0].y, 10 * scale),
"resize correctly adjusts y of component 0");
t.ok(withinTolerance(ring.components[1].x, 11 * scale),
"resize correctly adjusts x of component 1");
t.ok(withinTolerance(ring.components[1].y, 10 * scale),
"resize correctly adjusts y of component 1");
t.ok(withinTolerance(ring.components[2].x, 11 * scale),
"resize correctly adjusts x of component 2");
t.ok(withinTolerance(ring.components[2].y, 11 * scale),
"resize correctly adjusts y of component 2");
t.ok(withinTolerance(ring.components[3].x, 10 * scale),
"resize correctly adjusts x of component 3");
t.ok(withinTolerance(ring.components[3].y, 11 * scale),
"resize correctly adjusts y of component 3");
t.ok(withinTolerance(ring.components[4].x, 10 * scale),
"resize correctly adjusts x of component 4");
t.ok(withinTolerance(ring.components[4].y, 10 * scale),
"resize correctly adjusts y of component 4");
}
function test_containsPoint(t) {
/**
* The ring:
* edge 3
* (5, 10) __________ (15, 10)
* / /
* edge 4 / / edge 2
* / /
* (0, 0) /_________/ (10, 0)
* edge 1
*/
var components = [
new OpenLayers.Geometry.Point(0, 0),
new OpenLayers.Geometry.Point(10, 0),
new OpenLayers.Geometry.Point(15, 10),
new OpenLayers.Geometry.Point(5, 10)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
function p(x, y) {
return new OpenLayers.Geometry.Point(x, y);
}
// contains: 1 (touches), true (within), false (outside)
var cases = [{
point: p(5, 5), contains: true
}, {
point: p(20, 20), contains: false
}, {
point: p(15, 15), contains: false
}, {
point: p(0, 0), contains: 1 // lower left corner
}, {
point: p(10, 0), contains: 1 // lower right corner
}, {
point: p(15, 10), contains: 1 // upper right corner
}, {
point: p(5, 10), contains: 1 // upper left corner
}, {
point: p(5, 0), contains: 1 // on edge 1
}, {
point: p(5, -0.1), contains: false // below edge 1
}, {
point: p(5, 0.1), contains: true // above edge 1
}, {
point: p(12.5, 5), contains: 1 // on edge 2
}, {
point: p(12.4, 5), contains: true // left of edge 2
}, {
point: p(12.6, 5), contains: false // right of edge 2
}, {
point: p(10, 10), contains: 1 // on edge 3
}, {
point: p(10, 9.9), contains: true // below edge 3
}, {
point: p(10, 10.1), contains: false // above edge 3
}, {
point: p(2.5, 5), contains: 1 // on edge 4
}, {
point: p(2.4, 5), contains: false // left of edge 4
}, {
point: p(2.6, 5), contains: true // right of edge 4
}];
var len = cases.length;
t.plan(len);
var c;
for (var i=0; i<len; ++i) {
c = cases[i];
t.eq(ring.containsPoint(c.point), c.contains, "case " + i + ": " + c.point);
}
}
function test_containsPoint_precision(t) {
/**
* The test for linear ring containment was sensitive to failure when
* looking for ray crossings on nearly vertical edges. With a loss
* of precision in calculating the x-coordinate for the crossing,
* the method would erronously determine that the x-coordinate was
* not within the (very narrow) x-range of the nearly vertical edge.
*
* The test below creates a polygon whose first vertical edge is
* nearly horizontal. The test point lies "far" outside the polygon
* and we expect the containsPoint method to return false.
*/
t.plan(1);
var components = [
new OpenLayers.Geometry.Point(10000020.000001, 1000000),
new OpenLayers.Geometry.Point(10000020.000002, 1000010), // nearly vertical
new OpenLayers.Geometry.Point(10000030, 1000010),
new OpenLayers.Geometry.Point(10000030, 1000000)
];
var ring = new OpenLayers.Geometry.LinearRing(components);
var point = new OpenLayers.Geometry.Point(10000000, 1000001);
t.eq(ring.containsPoint(point), false, "false for point outside polygon with nearly vertical edge");
}
</script>
</head>
<body>
</body>
</html>
|
