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* Copyright 2012-2015 Canonical Ltd.
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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 Lesser General Public License as published by
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* the Free Software Foundation; version 3.
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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 Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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\inqmlmodule Ubuntu.Components 1.3
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\brief Various mathematical utility functions.
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\qmlmethod mathUtils::clamp(x, min, max)
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Ensure the value x is between min and max
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function clamp(x, min, max) {
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return Math.max(min, Math.min(x, max));
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// swap min/max if min > max
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return clamp(x, max, min);
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\qmlmethod mathUtils::lerp(delta, from, to)
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Get the linear interpolation
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function lerp(delta, from, to) {
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return ((1.0 - delta) * from) + (delta * to);
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\qmlmethod mathUtils::projectValue(x, xmin, xmax, ymin, ymax)
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Linearly project a value x from [xmin, xmax] into [ymin, ymax]
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function projectValue(x, xmin, xmax, ymin, ymax) {
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return ((x - xmin) * ymax - (x - xmax) * ymin) / (xmax - xmin)
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\qmlmethod mathUtils::clampAndProject(x, xmin, xmax, ymin, ymax)
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Linearly project a value x, but in addition to projectValue it's clamped to xmin/xmax first
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function clampAndProject(x, xmin, xmax, ymin, ymax) {
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return projectValue(clamp(x, xmin, xmax), xmin, xmax, ymin, ymax)
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src/Ubuntu/Components/1.3/mathUtils.js
