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Adding a RegularPolygon handler for drawing squares, triangles, circles, etc. Demo in the regular-polygon.html example. Also adding a createRegularPolygon class method to the Polygon geometry class. Thanks to crschmidt for all the tests and help getting this in (closes #828).

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@4205 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2007-09-10 20:24:27 +00:00
parent 623e6e7112
commit 35dae2bdb0
7 changed files with 724 additions and 0 deletions
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41
tests/Geometry/test_Polygon.html
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@@ -173,6 +173,47 @@
}
function test_Polygon_createRegular(t) {
t.plan(22);
var sides = 40;
var poly = OpenLayers.Geometry.Polygon.createRegularPolygon(new OpenLayers.Geometry.Point(5,0), 6, sides);
var polyBounds = poly.getBounds();
t.eq(polyBounds.toBBOX(), "-0.981504,-5.981504,10.981504,5.981504", sides + " sided figure generates correct bbox.");
t.eq(poly.components.length, 1, "Poly has one linear ring");
t.eq(poly.components[0].components.length, sides + 1, "ring has 41 components");
t.eq(poly.components[0].components[0].id, poly.components[0].components[sides].id, "ring starts and ends with same geom");
t.eq(Math.round(poly.getArea()), Math.round(Math.PI * 36), "area of "+sides+" sided poly rounds to same area as a circle.");
var sides = 3;
var poly = OpenLayers.Geometry.Polygon.createRegularPolygon(new OpenLayers.Geometry.Point(5,0), 6, sides);
var polyBounds = poly.getBounds();
t.eq(polyBounds.toBBOX(), "-0.196152,-3,10.196152,6", sides + " sided figure generates correct bbox.");
t.eq(poly.components.length, 1, "Poly has one linear ring");
t.eq(poly.components[0].components.length, sides + 1, "ring has correct count of components");
t.eq(poly.components[0].components[0].id, poly.components[0].components[sides].id, "ring starts and ends with same geom");
t.eq(Math.round(poly.getArea()), 47, "area of 3 sided poly is correct");
var sides = 3;
var poly3 = OpenLayers.Geometry.Polygon.createRegularPolygon(new OpenLayers.Geometry.Point(10,0), 15, sides);
var polyBounds = poly3.getBounds();
t.eq(polyBounds.toBBOX(), "-2.990381,-7.5,22.990381,15", sides + " sided figure generates correct bbox.");
t.eq(Math.round(polyBounds.getCenterLonLat().lon), 10, "longitude of center of bounds is same as origin");
t.eq(poly3.components.length, 1, "Poly has one linear ring");
t.eq(poly3.components[0].components.length, sides + 1, "ring has correct count of components");
t.eq(poly3.components[0].components[0].id, poly3.components[0].components[sides].id, "ring starts and ends with same geom");
t.ok(poly3.getArea() > poly.getArea(), "area with radius 15 > poly with radius 6");
var sides = 4;
var poly4 = OpenLayers.Geometry.Polygon.createRegularPolygon(new OpenLayers.Geometry.Point(10,0), 15, sides);
var polyBounds = poly4.getBounds();
t.eq(polyBounds.toBBOX(), "-0.606602,-10.606602,20.606602,10.606602", sides + " sided figure generates correct bbox.");
t.eq(Math.round(polyBounds.getCenterLonLat().lon), 10, "longitude of center of bounds is same as origin");
t.eq(poly4.components.length, 1, "Poly has one linear ring");
t.eq(poly4.components[0].components.length, sides + 1, "ring has correct count of components");
t.eq(poly4.components[0].components[0].id, poly4.components[0].components[sides].id, "ring starts and ends with same geom");
t.ok(poly4.getArea() > poly3.getArea(), "square with radius 15 > triangle with radius 15");
}
function test_Polygon_equals(t) {
t.plan(3);