backgrounds/components/Stars.qml

0001 /*
0002  * SPDX-FileCopyrightText: 2020 Han Young <hanyoung@protonmail.com>
0003  * SPDX-FileCopyrightText: 2020 Devin Lin <espidev@gmail.com>
0004  *
0005  * SPDX-License-Identifier: GPL-2.0-or-later
0006  */
0007 import QtQuick
0008 import QtQuick.Controls
0009 import QtQuick.Layouts
0010 import QtQuick.Shapes
0011 import org.kde.kirigami as Kirigami
0012
0013 Item {
0014     id: rootItem
0015     anchors.fill: parent
0016     property double starRadius: 1
0017
0018     property double opacityModifier: 0
0019
0020     NumberAnimation on opacityModifier {
0021         running: true
0022         to: 10000
0023         duration: Math.max(10000)
0024         onFinished: {
0025             if (rootItem.opacityModifier === 0) {
0026                 to = 10000;
0027             } else {
0028                 to = 0;
0029             }
0030             restart();
0031         }
0032     }
0033
0034     Repeater {
0035         model: 30
0036
0037         Item {
0038             id: shape
0039             anchors.fill: rootItem
0040
0041             property double starModifier: {
0042                 let num = 5000 * Math.random()
0043                 if (num < 1000) {
0044                     return 1000;
0045                 } else {
0046                     return num;
0047                 }
0048             }
0049
0050             opacity: {
0051                 let remainder = rootItem.opacityModifier % (2 * starModifier);
0052                 if (remainder > starModifier) { // opacity is decreasing
0053                     return (starModifier - (remainder % starModifier)) / starModifier;
0054                 } else { // opacity is increasing
0055                     return remainder / starModifier;
0056                 }
0057             }
0058
0059             Rectangle {
0060                 color: "#fff9c4"
0061                 height: starRadius * 2
0062                 width: height
0063                 radius: width / 2
0064                 x: Math.random() * rootItem.width
0065                 y: Math.random() * rootItem.height
0066             }
0067         }
0068     }
0069 }