My first task
Piotr Frankowski
frankowski.piotrek at gmail.com
Fri May 23 09:02:54 BST 2025
Hello,
Long time has passed, I have found some free time, and with little help of
LLM I have managed to reproduce your work, modify the script(?), and it
works. I have enabled stars, but I cannot force clouds display - I think
problem is inside of Marble. I have found, that in the script there is
marbleItem which is
https://api.kde.org/marble/html/MarbleQuickItem_8h_source.html - and it has
less properties than MarbleMap. In my setup there is a problem with getting
location - geolocation is returning access denied or something. My KDE is
5.27, I'm just curious if this script will work on new KDE. This is my
sript:
```
/*
* Copyright 2018 Friedrich W. H. Kossebau <kossebau at kde.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see <
http://www.gnu.org/licenses/>.
*/
import QtQuick 2.1
import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.extras 2.0 as PlasmaExtras
import org.kde.marble.private.plasma 0.20
MarbleItem {
id: marbleItem
// https://api.kde.org/marble/html/MarbleQuickItem_8h_source.html
// available properties
readonly property int centerMode: wallpaper.configuration.centerMode
property double fixedLongitude: wallpaper.configuration.fixedLongitude
property double fixedLatitude: wallpaper.configuration.fixedLatitude
property double locationLongitude: 0.0
property double locationLatitude: 0.0
enabled: false // do not handle input
radius: {
var ratio = width/height;
if (ratio > 1) {
return height / 2.5;
}
return width / 2.5
}
// Theme settings.
projection: MarbleItem.Spherical
mapThemeId: "earth/bluemarble/bluemarble.dgml"
// Visibility of layers/plugins.
showAtmosphere: true
showClouds: true
showBackground: true
showGrid: false
showCrosshairs: false
showCompass: false
showOverviewMap: false
showScaleBar: false
showOtherPlaces: false
showPublicTransport: false
showOutdoorActivities: false
onCenterModeChanged: handleCenterModeChange()
function handleCenterModeChange() {
if (centerMode === 0) {
marbleItem.centerOn(locationLongitude, locationLatitude);
} else if (centerMode === 1) {
marbleItem.centerOn(fixedLongitude, fixedLatitude);
} else {
marbleItem.centerOn(locationLongitude, locationLatitude);
}
}
onFixedLongitudeChanged: handleFixedLonLatChange()
onFixedLatitudeChanged: handleFixedLonLatChange()
function handleFixedLonLatChange() {
if (centerMode === 1) {
marbleItem.centerOn(fixedLongitude, fixedLatitude);
}
}
onLocationLongitudeChanged:handleLocationChange()
onLocationLatitudeChanged:handleLocationChange()
function handleLocationChange() {
if (centerMode === 2) {
marbleItem.centerOn(locationLongitude, locationLatitude);
}
}
Component.onCompleted: {
// marbleItem.setShowPlaces(false);
// marbleItem.setShowCities(false);
marbleItem.setShowOtherPlaces(showOtherPlaces);
marbleItem.setShowBackground(showBackground);
handleCenterModeChange();
}
PlasmaCore.DataSource {
id: geolocationDataSource
engine: "geolocation"
connectedSources: (marbleItem.centerMode === 2) ? ["location"] : []
interval: 10 * 60 * 1000 // every 30 minutes, might be still too
large for users on the ISS :P
}
Timer {
id: sunPositionTimer
interval: 60000 // Update every minute
running: marbleItem.centerMode === 0 // Only when following sun
repeat: true
triggeredOnStart: true
onTriggered: {
var sunPos = calculateSunPosition();
marbleItem.locationLongitude = sunPos.longitude;
marbleItem.locationLatitude = sunPos.latitude;
handleCenterModeChange();
}
}
// Function to calculate sun's position
function calculateSunPosition() {
var now = new Date();
var dayOfYear = getDayOfYear(now);
var timeOfDay = now.getUTCHours() + now.getUTCMinutes() / 60.0;
// Solar declination (simplified)
var declination = -23.45 * Math.cos(2 * Math.PI * (dayOfYear + 10)
/ 365.25);
// Hour angle - sun's longitude changes 15 degrees per hour
var hourAngle = 15 * (timeOfDay - 12); // 0° at solar noon (12:00
UTC)
// Sun's subsolar point
var longitude = hourAngle;
var latitude = declination;
// Normalize longitude to [-180, 180]
while (longitude > 180) longitude -= 360;
while (longitude < -180) longitude += 360;
// debug
//console.log("[earthglobe]]: ", longitude);
//console.log("[earthglobe]]: ", latitude);
return {
longitude: -longitude,
latitude: -latitude
};
}
function getDayOfYear(date) {
var start = new Date(date.getFullYear(), 0, 0);
var diff = date - start;
return Math.floor(diff / (1000 * 60 * 60 * 24));
}
}
```
[image: image.png]
pt., 12 cze 2020 o 21:26 Piotr Frankowski <frankowski.piotrek at gmail.com>
napisał(a):
> Thanks - good starting point for me. Your email is like 5 hours of
> mentoring;) have a nice weekend
>
> pt., 12 cze 2020 o 01:10 Friedrich W. H. Kossebau <kossebau at kde.org>
> napisał(a):
>
>> Hi Piotr,
>>
>> Am Donnerstag, 11. Juni 2020, 20:49:57 CEST schrieb Piotr Frankowski:
>> > Hello,
>> >
>> > First of all,thanks for such great piece of software, which I am using
>> for
>> > 15 years. I would like to make small contribution - but I need little
>> help,
>> > a kind of mentoring or a plan and help at begin. I would like rewrite
>> KDE4
>> > app - plasma-wallpaper-globe, to KDE5 using QML. I think it is possible
>> to
>> > do - I am thinking, that I should create plasma-wallpaper plugin, which
>> > uses Marbles Maps API.
>>
>> ((quick reminder to speak with same terms: post-KDE4 there is no KDE5,
>> things
>> got split in cross-platform apps (for platforms like Plasma, Gnome,
>> $OTHERLINUXSHELL, Windows, macOS, Android. HaikuOS, etc.), modular
>> reusable Qt
>> extensions (KDE Frameworks) and the actual workspace (Plasma).))
>>
>> When it comes to the Globe plasma wallpaper, there actually has been a
>> working
>> patch. I know because I did it :) Though just for coding fun, did not
>> plan to
>> use it, so it died as review request because no-one pushed and no-one
>> pulled.
>> It is up for adaption here, might still apply:
>> https://phabricator.kde.org/D11969
>>
>> > First questions:
>> > - is there template for plasma-wallpaper-plugin?
>>
>> Yes, the blog post you linked below is referencing one, and it does still
>> exist.
>>
>> > - is there tutorial for writing plasma-plugins?
>>
>> Sadly Plasma developers are lacking here and need support. People
>> learning are
>> some of the best people to write documentation/tutorials while they lean,
>> because they see all the problems and can mention them, so consider
>> picking up
>> that as side-task.
>>
>> > - I have found some linke, are they actual:
>> >
>> https://frinring.wordpress.com/2018/04/04/templates-to-create-your-own-plasm
>> > a-wallpaper-plugin/
>>
>> Should still apply (I just fixed some links now given you mentioned it
>> and I
>> found they were broken). Not tested though, but I would hope Plasma
>> developers
>> kept compatibility during Plasma 5 times ;)
>>
>> > - I should learn QML and C++, right?
>>
>> Yes. If you are completely new, best first walk yourself through all the
>> Qt
>> tutorials to get some first sense about things before you enter the
>> partially
>> rough world of developing for Plasma.
>> See https://doc.qt.io/qt-5/qtexamplesandtutorials.html and make yourself
>> familiar with Qt and QtQuick/Qml. And try to find some local people to
>> talk
>> and learn together in real life, that also helps (it did for me when I
>> started).
>>
>> Sorry, not available myself for mentoring.
>>
>> Cheers
>> Friedrich
>>
>>
>>
>
> --
> Pozdrawiam
> pf
>
--
Pozdrawiam
pf
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