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cubic-bezier.js
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/*
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* Copyright (C) 2016 Canonical, Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//====================================\\
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// 13thParallel.org BeziƩr Curve Code \\
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// by Dan Pupius (www.pupius.net) \\
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//====================================\\
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var coord =
function
(x,y) {
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if
(!x) var x=0;
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if
(!y) var y=0;
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return
{x: x, y: y};
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}
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function
B4(t) {
return
t*t*t }
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function
B3(t) {
return
3*t*t*(1-t) }
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function
B2(t) {
return
3*t*(1-t)*(1-t) }
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function
B1(t) {
return
(1-t)*(1-t)*(1-t) }
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var getBezier =
function
(percent,C1,C2,C3,C4) {
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var pos =
new
coord();
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pos.x = C1.x*B1(percent) + C2.x*B2(percent) + C3.x*B3(percent) + C4.x*B4(percent);
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pos.y = C1.y*B1(percent) + C2.y*B2(percent) + C3.y*B3(percent) + C4.y*B4(percent);
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return
pos;
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}
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cubic-bezier.js
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