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[[File:indicadorFetAmbGimp.gif|caption]]
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= Drawing a gauge using GIMP =
 
= Drawing a gauge using GIMP =
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[http://gimpchat.com/viewtopic.php?f=23&t=303 Steps to create a speedometer gauge]. It uses [https://github.com/bzed/gimp-plugin-registry/blob/master/layer-effects/layerfx.2.8.py layerfx.2.8.py script]. Once it has been downloaded, it should be copied at '''~/.gimp-2.8/scripts''' folder giving execution permissions ('''chmod u+x layerfx.2.8.py ''').
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[https://github.com/jordibinefa/Qt/blob/master/gauge01/madeWithGimp/indicador00.xcf indicador00.xcf] is a free version of previous tutorial.
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= Exporting from GIMP to QML =
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Download [https://github.com/qt-labs/gimp-qmlexporter qmlexpoter.py] at '''~/.gimp-2.8/plug-ins''' folder giving execution permissions ('''chmod u+x qmlexpoter.py ''').
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Restart GIMP to have the export command added to the '''File''' menu.
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Choose '''File > Export to QML''' to export GIMP design to a QML file.
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In the '''Export Layers to a QML Document''' dialog, enter a name and location for the QML file, and click '''Export'''.
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[https://github.com/jordibinefa/Qt/blob/master/gauge01/madeWithGimp/Indicador00.qml Indicador00.qml] and [https://github.com/jordibinefa/Qt/tree/master/gauge01/madeWithGimp/Indicador00_images Indicador00_images] folder exported from [https://github.com/jordibinefa/Qt/blob/master/gauge01/madeWithGimp/indicador00.xcf indicador00.xcf]
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(Official info: [http://doc.qt.io/qtcreator/quick-export-to-qml.html Exporting from GIMP to QML] from doc.qt.io )
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= Modifying exported QML file =
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Original [https://github.com/jordibinefa/Qt/blob/master/gauge01/madeWithGimp/Indicador00.qml Indicador00.qml] file.
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[[File:Indicador00 00.png|caption]]
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Copying [https://github.com/jordibinefa/Qt/blob/master/gauge01/madeWithGimp/Indicador00.qml Indicador00.qml] to [https://github.com/jordibinefa/Qt/blob/master/gauge01/imatge01/Indicador00.ui.qml Indicador00.ui.qml] and modifying some lines:
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[[File:Indicador00 00.ui.qml.png|caption]]
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At the header swapping
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import QtQuick 2.5
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by
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import QtQuick 2.9
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import QtQuick.Controls 2.2
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and all image paths starting by '''Indicador00_images/'''
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source:"Indicador00_images/fons.png"
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have been changed to '''qrc:/imatges/imatges/'''
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source:"qrc:/imatges/imatges/fons.png"
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Also it has been added an ID
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  id: giny
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and a new alias property
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property alias value: capabusca.rotation
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To be able to rotate needle
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[[File:Indicador00 01.png|caption]]
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has been added '''rotation''' property
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[[File:Indicador00 01.ui.qml.png|caption]]
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''capabusca'' comes from Catalan ''capa busca'' meaning ''needle layer''
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= Giving values to gauge =
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I have taken advantage of [https://doc.qt.io/qt-5.11/qtquickextras-dashboard-example.html QML dashboard example] to generate dynamic values. In this project I am using [https://doc.qt.io/qt-5.11/qtquickextras-dashboard-qml-valuesource-qml.html ValueSource.qml Example File] without any modification.
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This is the [https://github.com/jordibinefa/Qt/blob/master/gauge01/imatge01/main.qml main.qml]:
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[[File:Main.qml.png|caption]]
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Using [https://doc.qt.io/qt-5.11/qtquickextras-dashboard-qml-valuesource-qml.html ValueSource.qml]
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ValueSource {
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    id: valueSource
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}
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and showing its '''kph''' value at top-left corner
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Text {
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    anchors.top: parent
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    text: valueSource.'''kph'''
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}
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Gauge [https://github.com/jordibinefa/Qt/blob/master/gauge01/imatge01/Indicador00.ui.qml '''Indicador00'''] is centered and '''valueSource.kph''' is giving a value to '''speed2angle''' javascript function
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function '''speed2angle'''(nV){
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    return nV*360/160;
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}
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Indicador00{
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    anchors.centerIn: parent
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    value: '''speed2angle(valueSource.kph)'''
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}
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These are the '''qml.qrc''' contents:
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[[File:Qml.qrc.png|caption]]
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= Compiling and running =
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If after compiling you are not able to see the gauge, then try '''Build/Run qmake''' menu option and '''Run''' again.
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If you want to try this app on Android you can download [https://github.com/jordibinefa/Qt/raw/master/gauge01/apk/imatge01.apk imatge01.apk] and install it.

Revisió de 18:42, 10 ago 2018

caption

Drawing a gauge using GIMP

Steps to create a speedometer gauge. It uses layerfx.2.8.py script. Once it has been downloaded, it should be copied at ~/.gimp-2.8/scripts folder giving execution permissions (chmod u+x layerfx.2.8.py ).

indicador00.xcf is a free version of previous tutorial.

Exporting from GIMP to QML

Download qmlexpoter.py at ~/.gimp-2.8/plug-ins folder giving execution permissions (chmod u+x qmlexpoter.py ).

Restart GIMP to have the export command added to the File menu. Choose File > Export to QML to export GIMP design to a QML file. In the Export Layers to a QML Document dialog, enter a name and location for the QML file, and click Export.

Indicador00.qml and Indicador00_images folder exported from indicador00.xcf

(Official info: Exporting from GIMP to QML from doc.qt.io )

Modifying exported QML file

Original Indicador00.qml file.

caption

Copying Indicador00.qml to Indicador00.ui.qml and modifying some lines:

caption

At the header swapping 

import QtQuick 2.5

by 

import QtQuick 2.9
import QtQuick.Controls 2.2

and all image paths starting by Indicador00_images/ 

source:"Indicador00_images/fons.png"

have been changed to qrc:/imatges/imatges/ 

source:"qrc:/imatges/imatges/fons.png"

Also it has been added an ID 

 id: giny

and a new alias property 

property alias value: capabusca.rotation

To be able to rotate needle

caption

has been added rotation property

caption

capabusca comes from Catalan capa busca meaning needle layer

Giving values to gauge

I have taken advantage of QML dashboard example to generate dynamic values. In this project I am using ValueSource.qml Example File without any modification.

This is the main.qml:

caption

Using ValueSource.qml 

ValueSource {
   id: valueSource
}

and showing its kph value at top-left corner 

Text {
   anchors.top: parent
   text: valueSource.kph
}

Gauge Indicador00 is centered and valueSource.kph is giving a value to speed2angle javascript function 

function speed2angle(nV){
   return nV*360/160;
}
Indicador00{
   anchors.centerIn: parent
   value: speed2angle(valueSource.kph)
}

These are the qml.qrc contents:

caption


Compiling and running

If after compiling you are not able to see the gauge, then try Build/Run qmake menu option and Run again.

If you want to try this app on Android you can download imatge01.apk and install it.

Obtingut de «https://wiki.binefa.cat/index.php?title=Making_a_QML_gauge_from_GIMP&oldid=526»