Created
July 2, 2021 03:17
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Get the inner angle at point "b" in degrees
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| function inner_angle(a,b,c){ // inner angle at point b in degrees | |
| var v1=[a[0] - b[0], a[1] - b[1]], | |
| v2=[c[0] - b[0], c[1] - b[1]]; | |
| return Math.acos(math.inner(v1, v2) / (math.norm(v1) * math.norm(v2))) * 180 / Math.PI; | |
| } | |
| var math={ | |
| norm: function(v){ | |
| var s=0, n=v.length; | |
| for(var i=0; i < n; ++i){ | |
| s += Math.pow(v[i], 2); | |
| } | |
| return Math.sqrt(s); | |
| }, | |
| inner: function(a,b){ | |
| var s=0; | |
| for(var i=0; i < a.length; ++i){ | |
| s += (a[i]*b[i]); | |
| } | |
| return s; | |
| } | |
| } |
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