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Viewing changes to plugins/Ubuntu/Settings/Fingerprint/SegmentBoundingBoxes.qml

  • Committer: Bileto Bot
  • Date: 2016-06-20 14:01:03 UTC
  • mfrom: (103.6.69 fingerprint)
  • Revision ID: ci-train-bot@canonical.com-20160620140103-q57lulbze89e6yyd
jonas-drange
* Add components for Fingerprint management.

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plugins/Ubuntu/Settings/Fingerprint/SegmentBoundingBoxes.qml
 
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/*
 
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 * Copyright 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 Lesser 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 Lesser General Public License for more details.
 
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 *
 
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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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 *
 
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 * Authored by  Florian Boucault <florian.boucault@canonical.com>
 
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 */
 
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import QtQuick 2.4
 
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QtObject {
 
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    id: segmentBoundingBoxes
 
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    property string source
 
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    onSourceChanged: parseBoundingBoxes(source)
 
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    property var boundingBoxes: []
 
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    property real width
 
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    property real height
 
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    property int count: boundingBoxes.length
 
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    // The API cannot be used reliably before this signal has been emitted.
 
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    signal ready()
 
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    function parseBoundingBoxes(source) {
 
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        var xhr = new XMLHttpRequest;
 
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        xhr.open("GET", source);
 
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        xhr.onreadystatechange = function() {
 
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            if (xhr.readyState == XMLHttpRequest.DONE) {
 
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                var b = [];
 
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                var json = JSON.parse(xhr.responseText);
 
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                boundingBoxes = json["boxes"];
 
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                width = json["width"];
 
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                height = json["height"];
 
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                ready();
 
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            }
 
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        }
 
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        xhr.send();
 
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    }
 
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    function intersects(box1, box2) {
 
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        // TODO: optimize
 
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        var x11 = box1[0];
 
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        var y11 = box1[1];
 
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        var x12 = box1[0] + box1[2];
 
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        var y12 = box1[1] + box1[3];
 
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        var x21 = box2[0];
 
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        var y21 = box2[1];
 
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        var x22 = box2[0] + box2[2];
 
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        var y22 = box2[1] + box2[3];
 
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        var x_overlap = Math.max(0, Math.min(x12,x22) - Math.max(x11,x21));
 
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        var y_overlap = Math.max(0, Math.min(y12,y22) - Math.max(y11,y21));
 
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        return (x_overlap / Math.min(box1[2], box2[2]) > 0.25
 
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             && y_overlap / Math.min(box1[3], box2[3]) > 0.25);
 
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    }
 
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    function computeIntersections(hitBox) {
 
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        var absoluteHitBox = [hitBox[0] * width, hitBox[1] * height,
 
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                              hitBox[2] * width, hitBox[3] * height];
 
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        var intersections = [];
 
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        for (var i in boundingBoxes) {
 
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            var boundingBox = boundingBoxes[i];
 
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            if (intersects(absoluteHitBox, boundingBox)) {
 
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                intersections.push(i);
 
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            }
 
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        }
 
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        return intersections;
 
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    }
 
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}