mirror of
https://github.com/photonstorm/phaser
synced 2024-12-26 13:03:36 +00:00
27 lines
641 B
JavaScript
27 lines
641 B
JavaScript
|
var Triangle = require('./Triangle');
|
||
|
|
|
||
|
|
// Builds an equilateral triangle.
|
||
|
|
// In the equilateral triangle, all the sides are the same length (congruent)
|
||
|
|
// and all the angles are the same size (congruent).
|
||
|
|
|
||
|
|
// The x/y specifies the top-middle of the triangle (x1/y1) and length
|
||
|
|
// is the length of each side
|
||
|
|
|
||
|
|
var BuildEquilateral = function (x, y, length)
|
||
|
|
{
|
||
|
|
var height = length * (Math.sqrt(3) / 2);
|
||
|
|
|
||
|
|
var x1 = x;
|
||
|
|
var y1 = y;
|
||
|
|
|
||
|
|
var x2 = x + (length / 2);
|
||
|
|
var y2 = y + height;
|
||
|
|
|
||
|
|
var x3 = x - (length / 2);
|
||
|
|
var y3 = y + height;
|
||
|
|
|
||
|
|
return new Triangle(x1, y1, x2, y2, x3, y3);
|
||
|
|
};
|
||
|
|
|
||
|
|
module.exports = BuildEquilateral;
|