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/*
Copyright 2008-2023
Matthias Ehmann,
Carsten Miller,
Andreas Walter,
Alfred Wassermann
This file is part of JSXGraph.
JSXGraph is free software dual licensed under the GNU LGPL or MIT License.
You can redistribute it and/or modify it under the terms of the
* GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version
OR
* MIT License: https://github.com/jsxgraph/jsxgraph/blob/master/LICENSE.MIT
JSXGraph is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License and
the MIT License along with JSXGraph. If not, see <https://www.gnu.org/licenses/>
and <https://opensource.org/licenses/MIT/>.
*/
describe("Test intersection functions", function () {
var board;
document.getElementsByTagName("body")[0].innerHTML =
'<div id="jxgbox" style="width: 100px; height: 100px;"></div>';
board = JXG.JSXGraph.initBoard("jxgbox", {
renderer: "svg",
axis: false,
grid: false,
boundingbox: [-8, 8, 8, -8],
showCopyright: false,
showNavigation: false
});
it("Intersection curve-circle", function () {
var A = board.create("point", [0, 4], { visible: false }),
B = board.create("point", [0, -4], { visible: false }),
C = board.create("point", [1, 0], { visible: false }),
el = board.create("ellipse", [A, B, C]),
circle = board.create(
"circle",
[
[0, 0],
[2, 0]
],
{ point2: { color: "red" }, strokeWidth: 1 }
),
ip = [],
i,
x = [
0.9012517057297676, -0.9013129108207755, -0.901326508055587, 0.9012803196247847
],
y = [
1.7849765412698027, 1.7849451757430674, -1.7849382076228515, -1.7849618776221492
];
for (i = 0; i < 4; i++) {
ip[i] = board.create("intersection", [circle, el, i], { name: "" + i });
}
for (i = 0; i < 4; i++) {
expect(ip[i].X()).toBeCloseTo(x[i], 5);
expect(ip[i].Y()).toBeCloseTo(y[i], 5);
}
});
it("Intersection arc-arc", function () {
var a1 = board.create("arc", [
[0, 2],
[-3, 2],
[3, 2]
]),
a2 = board.create("arc", [
[0, 0],
[3, 0],
[-3, 0]
]),
ip = [],
i,
x = [-2.8286194188088936, 2.8286194188088922],
y = [1.0000000000000016, 0.9999999999999984];
ip[0] = board.create("intersection", [a1, a2, 0], {
alwaysIntersect: false
});
ip[1] = board.create("intersection", [a1, a2, 1]);
for (i = 0; i < 2; i++) {
expect(ip[i].X()).toBeCloseTo(x[i], 14);
expect(ip[i].Y()).toBeCloseTo(y[i], 14);
}
});
it("Intersection arc-sector", function () {
var a1 = board.create("sector", [
[0, 2],
[-3, 2],
[3, 2]
]),
a2 = board.create("arc", [
[0, 0],
[3, 0],
[-3, 0]
]),
ip = [],
i,
x = [-2.8286194188088936, 2.8286194188088922],
y = [1.0000000000000016, 0.9999999999999984];
ip[0] = board.create("intersection", [a1, a2, 0], {
alwaysIntersect: false
});
ip[1] = board.create("intersection", [a1, a2, 1]);
for (i = 0; i < 2; i++) {
expect(ip[i].X()).toBeCloseTo(x[i], 14);
expect(ip[i].Y()).toBeCloseTo(y[i], 14);
}
});
});
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