Re: [Qgis-developer] Open a *.qgs project file in API, why maps do not show?

[Spartucus]

Hi Gary,
According to the QgisApp::addProject( QString projectFile ) function, I did
some change in my code. However, the map still doesn't show, but the CRS in
project works fine. So I think the project file was read but there is
something wrong about display(or MapCanvas).

I don't use Python plug-ins and ScaleComboBox, so I remove the relevant
part, the code is:




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Re: [Qgis-developer] Open a *.qgs project file in API, why maps do not show?

[Spartucus]

Hi Gary ,
Thanks for reply! 
I don't what iface is. Is it another name of QgsProject::instance()? I'm
using C++ to developing app.



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Re: [Qgis-developer] Open a *.qgs project file in API, why maps do not show?

[Spartucus]

Thanks a lot! I will try that.



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Re: [Qgis-developer] Is QGIS supports dynamic display?

[Spartucus]

Hi Martin,
I implemented my own canvas item for SVG markers like you told me. But 
When
I created a object of custom canvas item in main, it broke down. The error
says 'This may be due to a corruption of the heap...', see more in
error.jpg.  I looked up for answers in exchange, which I found a similar
topic  here
http://gis.stackexchange.com/questions/81465/how-to-refresh-layers-independently/81470#81470
 
, in the topic Nathan did exactly what I did. I don't know why.
http://osgeo-org.1560.x6.nabble.com/file/n5161805/error.jpg  
Here is my code:

//main.cpp
int main(int argc, char ** argv) 
{
// Start the Application
QgsApplication app(argc, argv, true);

QgsMapCanvas * mypMapCanvas = new QgsMapCanvas();
mypMapCanvas-setVisible(true);
mypMapCanvas-refresh();

QString fileName = 
D:\\qgis\\svg\\symbol\\poi_tower_communications.svg;
TFMapCanvasSvgItem mTFSvgItem(mypMapCanvas, fileName);
mTFSvgItem.setPos(0, 0);
return app.exec();
}

// Custom canvas item class -TFMapCanvasSvgItem.h   
class TFMapCanvasSvgItem: public QgsMapCanvasItem
{
public:
TFMapCanvasSvgItem(QgsMapCanvas* canvas, QString 
fileName = );
~TFMapCanvasSvgItem();

void paint(QPainter* painter);
QRectF boundingRect() const;
void setFilePath(const QString file);
QString filePath() const {return mFilePath;}

private:
QSvgRenderer mSvgRenderer;
QString mFilePath;
};

//TFMapCanvasSvgItem.cpp
TFMapCanvasSvgItem::TFMapCanvasSvgItem(QgsMapCanvas* 
canvas, QString
fileName): QgsMapCanvasItem(canvas), mSvgRenderer(fileName)
{
}

TFMapCanvasSvgItem::~TFMapCanvasSvgItem()
{

}

void TFMapCanvasSvgItem::paint(QPainter* painter)
{
if (!painter)
{
return;
}

QRectF viewBox = mSvgRenderer.viewBoxF();
if (viewBox.isValid())
{
setPos(this-toCanvasCoordinates(QgsPoint(0.0, 
0.0)));
mSvgRenderer.render(painter, viewBox);
}
}

QRectF TFMapCanvasSvgItem::boundingRect() const
{   
QRectF viewBox = mSvgRenderer.viewBoxF();
qreal halfWeight = viewBox.width() / 2;
qreal halfHeight = viewBox.height() / 2;
return QRectF(-halfWeight, -halfHeight, viewBox.width(),
viewBox.height());
}

void TFMapCanvasSvgItem::setFilePath(const QString file)
{
mFilePath = file;
mSvgRenderer.load(mFilePath);
}



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Re: [Qgis-developer] Is QGIS supports dynamic display?

[Spartucus]

Never mind. I solved the problem.

void TFMapCanvasSvgItem::paint(QPainter* painter)
{
if (!painter)
{
return;
}
QImage svgImage(50, 40, QImage::Format_ARGB32);
svgImage.fill(Qt::transparent);
QPainter imagePainter(svgImage);
mSvgRenderer.render(imagePainter);
painter-drawImage(QRectF(0, 0, 100, 80), svgImage, QRectF(0, 0, 100, 
80));
painter-restore();
}



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