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995d612caa5efb51e919c625bb071bc1db8c684d
openlayers/tests/Geometry/LineString.html

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<html>
<head>
<script src="../OLLoader.js"></script>
<script type="text/javascript">
var line;
var components = [new OpenLayers.Geometry.Point(10,15),
new OpenLayers.Geometry.Point(0,0)];
function test_LineString_constructor (t) {
t.plan( 3 );
line = new OpenLayers.Geometry.LineString();
t.ok( line instanceof OpenLayers.Geometry.LineString, "new OpenLayers.Geometry.LineString returns line object" );
t.eq( line.CLASS_NAME, "OpenLayers.Geometry.LineString", "line.CLASS_NAME is set correctly");
t.eq( line.components, [], "line.components is set correctly");
}
function test_LineString_constructor (t) {
t.plan( 3 );
line = new OpenLayers.Geometry.LineString(components);
t.ok( line instanceof OpenLayers.Geometry.LineString, "new OpenLayers.Geometry.LineString returns line object" );
t.eq( line.CLASS_NAME, "OpenLayers.Geometry.LineString", "line.CLASS_NAME is set correctly");
// TBD FIXME, recursion
// t.eq( line.components, components, "line.components is set correctly");
t.eq( line.components.length, 2, "line.components.length is set correctly");
}
function test_LineString_toString(t) {
t.plan(1);
line = new OpenLayers.Geometry.LineString(components);
t.eq(line.toString(),
"LINESTRING(10 15,0 0)",
"toString() returns WKT");
}
function test_LineString_removeComponent(t) {
t.plan(2);
OpenLayers.Geometry.Collection.prototype._removeComponent =
OpenLayers.Geometry.Collection.prototype.removeComponent;
OpenLayers.Geometry.Collection.prototype.removeComponent =
function(point) { g_removeComponent = point; };
line = new OpenLayers.Geometry.LineString(components);
g_removeComponent = null;
line.removeComponent(components[0]);
t.ok(g_removeComponent == null, "point not removed if only 2 points in components");
line.components.push(new OpenLayers.Geometry.Point(4,4));
line.removeComponent(components[0]);
t.ok(g_removeComponent, components[0], "point removed if 3 points in components");
OpenLayers.Geometry.Collection.prototype.removeComponent =
OpenLayers.Geometry.Collection.prototype._removeComponent;
}
function test_LineString_move(t) {
t.plan(4);
var components = [new OpenLayers.Geometry.Point(10,15),
new OpenLayers.Geometry.Point(0,0)];
var line = new OpenLayers.Geometry.LineString(components);
var x0 = components[0].x;
var y0 = components[0].y;
var x1 = components[1].x;
var y1 = components[1].y;
var dx = 10 * Math.random();
var dy = 10 * Math.random();
line.move(dx, dy);
t.eq(line.components[0].x, x0 + dx, "move() correctly modifies first x");
t.eq(line.components[0].y, y0 + dy, "move() correctly modifies first y");
t.eq(line.components[1].x, x1 + dx, "move() correctly modifies second x");
t.eq(line.components[1].y, y1 + dy, "move() correctly modifies second y");
}
function test_LineString_rotate(t) {
t.plan(6);
var components = [new OpenLayers.Geometry.Point(10,15),
new OpenLayers.Geometry.Point(0,0)];
var geometry = new OpenLayers.Geometry.LineString(components);
var originals = [];
var comp;
var angle = 2 * Math.PI * Math.random();
var origin = new OpenLayers.Geometry.Point(10 * Math.random(),
10 * Math.random());
for(var i=0; i<geometry.components.length; ++i) {
comp = geometry.components[i];
originals[i] = comp.rotate;
comp.rotate = function(a, o) {
t.ok(true, "rotate called for component " + i);
t.ok(a == angle, "rotate called with correct angle");
t.ok(o == origin, "rotate called with correct origin");
}
}
geometry.rotate(angle, origin);
// restore the original rotate defs
for(var i=0; i<geometry.components.length; ++i) {
comp.rotate = originals[i];
}
}
function test_LineString_resize(t) {
t.plan(8);
var tolerance = 1e-10;
var components = [new OpenLayers.Geometry.Point(10 * Math.random(),
10 * Math.random()),
new OpenLayers.Geometry.Point(10 * Math.random(),
10 * Math.random())];
var geometry = new OpenLayers.Geometry.LineString(components);
var origin = new OpenLayers.Geometry.Point(10 * Math.random(),
10 * Math.random());
var scale = 10 * Math.random();
var oldLength = geometry.getLength();
var ret = geometry.resize(scale, origin);
t.ok(ret === geometry, "resize returns geometry");
var newLength = geometry.getLength();
t.ok((((newLength / oldLength) - scale) / scale) < tolerance,
"resize correctly changes the length of a linestring")
var originals = [];
var comp;
for(var i=0; i<geometry.components.length; ++i) {
comp = geometry.components[i];
originals[i] = comp.resize;
comp.resize = function(s, o) {
t.ok(true, "resize called for component " + i);
t.ok(s == scale, "resize called with correct scale");
t.ok(o == origin, "resize called with correct origin");
}
}
geometry.resize(scale, origin);
// restore the original resize defs
for(var i=0; i<geometry.components.length; ++i) {
comp.resize = originals[i];
}
}
function test_split(t) {
var wkt = OpenLayers.Geometry.fromWKT;
var cases = [{
msg: "no intersection",
g1: "LINESTRING(0 0, 0 1)",
g2: "LINESTRING(1 0, 1 1)",
exp: null
} , {
msg: "intersection at midpoint",
g1: "LINESTRING(0 0, 1 1)",
g2: "LINESTRING(1 0, 0 1)",
exp: ["LINESTRING(1 0, 0.5 0.5)", "LINESTRING(0.5 0.5, 0 1)"]
}, {
msg: "intersection at midpoint (reverse source/target)",
g1: "LINESTRING(1 0, 0 1)",
g2: "LINESTRING(0 0, 1 1)",
exp: ["LINESTRING(0 0, 0.5 0.5)", "LINESTRING(0.5 0.5, 1 1)"]
}, {
msg: "intersection at endpoint",
g1: "LINESTRING(0 0, 1 1)",
g2: "LINESTRING(1 0, 1 1)",
exp: null
}, {
msg: "midpoint intersection, no options",
g1: "LINESTRING(0 0, 2 2)",
g2: "LINESTRING(0 2, 2 0)",
exp: ["LINESTRING(0 2, 1 1)", "LINESTRING(1 1, 2 0)"]
}, {
msg: "midpoint intersection, edge false",
opt: {edge: false},
g1: "LINESTRING(0 0, 2 2)",
g2: "LINESTRING(0 2, 2 0)",
exp: null
}, {
msg: "midpoint intersection, mutual",
opt: {mutual: true},
g1: "LINESTRING(0 0, 2 2)",
g2: "LINESTRING(0 2, 2 0)",
exp: [["LINESTRING(0 0, 1 1)", "LINESTRING(1 1, 2 2)"], ["LINESTRING(0 2, 1 1)", "LINESTRING(1 1, 2 0)"]]
}, {
msg: "close intersection, no tolerance",
g1: "LINESTRING(0 0, 0.9 0.9)",
g2: "LINESTRING(0 2, 2 0)",
exp: null
}, {
msg: "close intersection, within tolerance",
opt: {tolerance: 0.2},
g1: "LINESTRING(0 0, 0.9 0.9)",
g2: "LINESTRING(0 2, 2 0)",
exp: ["LINESTRING(0 2, 0.9 0.9)", "LINESTRING(0.9 0.9, 2 0)"]
}];
t.plan(cases.length);
var c, parts, part, midparts;
for(var i=0; i<cases.length; ++i) {
c = cases[i];
var g1 = wkt(c.g1);
var g2 = wkt(c.g2);
var got = g1.split(g2, c.opt);
var exp = c.exp;
if(got instanceof Array) {
parts = [];
for(var j=0; j<got.length; ++j) {
part = got[j];
if(part instanceof Array) {
midparts = [];
for(var k=0; k<part.length; ++k) {
midparts.push(part[k].toString());
}
parts.push("[" + midparts.join(", ") + "]");
} else {
parts.push(got[j].toString());
}
}
got = parts.join(", ");
}
if(exp instanceof Array) {
parts = [];
for(var j=0; j<exp.length; ++j) {
part = exp[j];
if(part instanceof Array) {
midparts = [];
for(var k=0; k<part.length; ++k) {
midparts.push(wkt(part[k]).toString());
}
parts.push("[" + midparts.join(", ") + "]");
} else {
parts.push(wkt(exp[j]).toString());
}
}
exp = parts.join(", ");
}
t.eq(got, exp, "case " + i + ": " + c.msg);
}
}
function test_distanceTo(t) {
var wkt = OpenLayers.Geometry.fromWKT;
var geoms = [
wkt("POINT(0 0)"),
wkt("LINESTRING(-2 0, 0 -2, 2 -1, 2 0)")
];
var cases = [{
got: geoms[1].distanceTo(geoms[0]),
expected: Math.sqrt(2)
}, {
got: geoms[1].distanceTo(geoms[0], {details: true}),
expected: {
distance: Math.sqrt(2),
x0: -1, y0: -1,
x1: 0, y1: 0
}
}];
t.plan(cases.length);
for(var i=0; i<cases.length; ++i) {
t.eq(cases[i].got, cases[i].expected, "case " + i);
}
}
function test_LineString_equals(t) {
t.plan(3);
var x0 = Math.random() * 100;
var y0 = Math.random() * 100;
var x1 = Math.random() * 100;
var y1 = Math.random() * 100;
var point0 = new OpenLayers.Geometry.Point(x0, y0);
var point1 = new OpenLayers.Geometry.Point(x1, y1);
var geometry = new OpenLayers.Geometry.LineString([point0, point1]);
var equal = new OpenLayers.Geometry.LineString([point0, point1]);
var offX = new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(x0 + 1, y0),
new OpenLayers.Geometry.Point(x1 + 1, y1)]);
var offY = new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(x0, y0 + 1),
new OpenLayers.Geometry.Point(x1, y1 + 1)]);
t.ok(geometry.equals(equal),
"equals() returns true for a geometry with equivalent coordinates");
t.ok(!geometry.equals(offX),
"equals() returns false for a geometry with offset x");
t.ok(!geometry.equals(offY),
"equals() returns false for a geometry with offset y");
}
function test_getVertices(t) {
t.plan(14);
var points = [
new OpenLayers.Geometry.Point(10, 20),
new OpenLayers.Geometry.Point(20, 30),
new OpenLayers.Geometry.Point(30, 40),
new OpenLayers.Geometry.Point(40, 50)
];
var line = new OpenLayers.Geometry.LineString(points);
var verts = line.getVertices();
t.ok(verts instanceof Array, "got back an array");
t.eq(verts.length, points.length, "of correct length length");
t.geom_eq(verts[0], points[0], "0: correct geometry");
t.geom_eq(verts[1], points[1], "1: correct geometry");
t.geom_eq(verts[2], points[2], "2: correct geometry");
t.geom_eq(verts[3], points[3], "3: correct geometry");
// get nodes only
var nodes = line.getVertices(true);
t.ok(nodes instanceof Array, "[nodes only] got back an array");
t.eq(nodes.length, 2, "[nodes only] of correct length length");
t.geom_eq(nodes[0], points[0], "[nodes only] first: correct geometry");
t.geom_eq(nodes[1], points[points.length-1], "[nodes only] last: correct geometry");
// no nodes
var nodes = line.getVertices(false);
t.ok(nodes instanceof Array, "[no nodes] got back an array");
t.eq(nodes.length, 2, "[no nodes] of correct length length");
t.geom_eq(nodes[0], points[1], "[no nodes] first: correct geometry");
t.geom_eq(nodes[1], points[2], "[no nodes] last: correct geometry");
}
function test_LineString_clone(t) {
t.plan(2);
var x0 = Math.random() * 100;
var y0 = Math.random() * 100;
var x1 = Math.random() * 100;
var y1 = Math.random() * 100;
var point0 = new OpenLayers.Geometry.Point(x0, y0);
var point1 = new OpenLayers.Geometry.Point(x1, y1);
var geometry = new OpenLayers.Geometry.LineString([point0, point1]);
var clone = geometry.clone();
t.ok(clone instanceof OpenLayers.Geometry.LineString,
"clone() creates an OpenLayers.Geometry.LineString");
t.ok(geometry.equals(clone), "clone has equivalent coordinates");
}
function test_getGeodesicLength(t) {
// expected values from http://www.movable-type.co.uk/scripts/latlong-vincenty.html
var cases = [{
wkt: "LINESTRING(0 0, -10 45)",
exp: 5081689.690
}, {
wkt: "LINESTRING(-10 45, 0 0)",
exp: 5081689.690
}, {
wkt: "LINESTRING(0 0, -10 45, -20 50)",
exp: 5081689.690 + 935018.062
}];
t.plan(cases.length);
var geom, got;
for(var i=0; i<cases.length; ++i) {
geom = new OpenLayers.Geometry.fromWKT(cases[i].wkt);
got = geom.getGeodesicLength();
t.eq(Math.round(got), Math.round(cases[i].exp), "[case " + i + "] length calculated");
}
}
function test_LineString_simplify(t){
t.plan(8);
var ls1 = new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(1,2.1),
new OpenLayers.Geometry.Point(1.8,3.8),
new OpenLayers.Geometry.Point(2,4),
new OpenLayers.Geometry.Point(3,4),
new OpenLayers.Geometry.Point(4,4.5),
new OpenLayers.Geometry.Point(5,5)
]);
var ls2 = new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(1,2.1),
new OpenLayers.Geometry.Point(1.8,3.8),
new OpenLayers.Geometry.Point(2,4),
new OpenLayers.Geometry.Point(3,4),
new OpenLayers.Geometry.Point(4,4.5),
new OpenLayers.Geometry.Point(5,5),
new OpenLayers.Geometry.Point(0,0)
]);
var ls3 = new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(1,1)
]);
var ls5 = new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(1,1),
new OpenLayers.Geometry.Point(2,2),
new OpenLayers.Geometry.Point(3,3),
new OpenLayers.Geometry.Point(4,4),
new OpenLayers.Geometry.Point(5,5)
]);
var ls6 = new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(0,0),
new OpenLayers.Geometry.Point(1,1),
new OpenLayers.Geometry.Point(1,1),
new OpenLayers.Geometry.Point(3,2)
]);
t.ok(ls1 instanceof OpenLayers.Geometry.LineString, 'LineString is instance of OpenLayers.Geometry.LineString');
var simplified1 = ls1.simplify(0.5);
t.ok(simplified1 instanceof OpenLayers.Geometry.LineString, 'Simplified LineString is instance of OpenLayers.Geometry.LineString');
t.ok(simplified1.getVertices().length <= ls1.getVertices().length, 'Simplified LineString has less or equal number of vertices');
// The simplified version is derived from PostGIS function ST_SIMPLIFY()
t.ok(simplified1.toString() === 'LINESTRING(0 0,1.8 3.8,5 5)', 'LineString 1 was simplified correctly');
var simplified2 = ls2.simplify(0.5);
// The simplified version is derived from PostGIS function ST_SIMPLIFY()
t.ok(simplified2.toString() === 'LINESTRING(0 0,1.8 3.8,5 5,0 0)', 'LineString 2 was simplified correctly');
var simplified3 = ls3.simplify(0.5);
t.ok(simplified3.toString() === ls3.toString(), 'LineString with 2 vertices is left untouched');
var simplified5 = ls5.simplify(0.0);
t.ok(simplified5.toString() === 'LINESTRING(0 0,5 5)', 'A tolerance of 0 returns the optimized version needless vertices');
var simplified6 = ls6.simplify(0.0);
t.ok(simplified6.toString() === 'LINESTRING(0 0,1 1,3 2)', 'A tolerance of 0 returns the optimized version without doubled vertices');
}
</script>
</head>
<body>
</body>
</html>
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