[Qgis-developer] Render with labels

[Ziegler Stefan]

Hi

I did have some problems with dpi output and qgsmaprenderer. Martin Dobias helped me at the hackfest. Now I’m using qgsmaprendererjob classes and it works with custom dpi and labels:

    mapSettings = QgsMapSettings()
    mapSettings.setMapUnits(0)
    mapSettings.setExtent(rect)
    mapSettings.setOutputDpi(DPI)
    mapSettings.setOutputSize(QSize(width, height))
    mapSettings.setLayers(lst)
    mapSettings.setFlags(QgsMapSettings.Antialiasing | QgsMapSettings.UseAdvancedEffects | QgsMapSettings.ForceVectorOutput | QgsMapSettings.DrawLabeling)

    img = QImage(QSize(width, height), QImage.Format_RGB32)
    #img = QImage(QSize(width, height), QImage.Format_Mono)
    img.setDotsPerMeterX(DPI / 25.4 * 1000)
    img.setDotsPerMeterY(DPI / 25.4 * 1000)

    p = QPainter()
    p.begin(img)

    mapRenderer = QgsMapRendererCustomPainterJob(mapSettings, p)

    mapRenderer.start()
    mapRenderer.waitForFinished()

    p.end()

    img.save("/tmp/"+filename+".png","png")

regards
Stefan

Von: qgis-developer-bounces at lists.osgeo.org [mailto:qgis-developer-bounces at lists.osgeo.org] Im Auftrag von Geo DrinX
Gesendet: Montag, 6. Oktober 2014 11:25
An: Anita Graser
Cc: qgis-developer at lists.osgeo.org
Betreff: Re: [Qgis-developer] Render with labels

Hello,
Sorry if I repeat my question that I sent some time ago,  but it seems very relevant to the topic.

I noticed that using  the    .render()    function  with  pyQgis > 2.2   the labels are not  visible.
This is my test source code (taken from my GEarthView plugin):


                iface = qgis.utils.iface

                mapRenderer = mapCanvas.mapRenderer()
                mapRect = mapRenderer.extent()
                width = mapRenderer.width()
                height = mapRenderer.height()
                srs = mapRenderer.destinationCrs()

                # create output image and initialize it
                image = QImage(QSize(width, height), QImage.Format_ARGB32)
                image.fill(0)

                #adjust map canvas (renderer) to the image size and render
                imagePainter = QPainter(image)

                zoom = 1
                target_dpi = int(round(zoom * mapRenderer.outputDpi()))

                mapRenderer.setOutputSize(QSize(width, height), target_dpi)

                mapRenderer.render(imagePainter)
                imagePainter.end()

                xN = mapRect.xMinimum()
                yN = mapRect.yMinimum()

                nomePNG = ("TestImage")

                input_file = out_folder + "/" + nomePNG + ".png"

                image.save(input_file, "png")

So, my question is :  how need to change my code to have labels again visible ?

:)

Thank you for any link and answer
Roberto

2014-10-05 22:18 GMT+02:00 Anita Graser <anitagraser at gmx.at<mailto:anitagraser at gmx.at>>:
Am 05.10.2014, 18:54 Uhr, schrieb Larry Shaffer <larrys at dakotacarto.com<mailto:larrys at dakotacarto.com>>:
Here's a small script you can use to test the Python bindings for labeling

Thanks a lot Larry! I'll give it a try!
Feel free to add this to the Cookbook. However, the API for labeling may
change during the 2.7 dev cycle, if rule- and style-based labeling is
introduced.

You mean it will change without breaking it? ;-)


Best wishes,
Anita


--
anitagraser.com<http://anitagraser.com>
_______________________________________________
Qgis-developer mailing list
Qgis-developer at lists.osgeo.org<mailto:Qgis-developer at lists.osgeo.org>
http://lists.osgeo.org/mailman/listinfo/qgis-developer

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20141006/fe1c0b25/attachment-0001.html>