Revisió del 18:23, 10 ago 2018

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.

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

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

has been added rotation property

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:

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:

// Per a que funcioni he hagut d'anar a Build/Run qmake