no match for call to (QPoint)(double) (double)

[GrahamB]

I am having a problem compiling a program that draws a polygon on a QGraphicsScene.
The problem is the values supplied to QPoint. The error is 'no match for call to (QPoint)(double) (double)'.
I have changed the variable data type to float and even int! With the same error (NOT double, of course).
The hard coded values to the polygon line works.
I have attached the relevant code.
Any advice would be much appreciated.
[CODEvoid DataDisplay::drawData()
{
QPen outlinePen(Qt::black);
QPolygonF polygon;
double x,y;

QPoint p1,p2;
x = 10.4;
y = 20.5;

p1(10.4,20.5);
x = 120.2;
y = 30.2;
p2(x,y);
// polygon << QPointF((float)10.4, (float)20.5) << QPoint((float)120.2, (float)30.2);
polygon << p1 << p2;

outlinePen.setWidth(2);
QGraphicsScene *scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);

QBrush greenBrush(Qt::green);
QBrush blueBrush(Qt::blue);
outlinePen.setWidth(2);

scene->addPolygon(polygon, outlinePen);
}][/CODE]

[ecanela]

you need use QPointF class instead of QPoint,

[GrahamB]

Thank you
I tried that. It didn't work.
The following does:

void DataDisplay::drawData()
{
QPen outlinePen(Qt::black);
QPolygonF polygon;
qreal x1,y1,x2,y2;

QPointF p1,p2;
x1 = 10.8;y1=20.1;
x2 = 120.2;y2=30.2;
p1.setX(x1);
p1.setY(y1);
p2.setX(x2);
p2.setY(y2);

// polygon << QPointF((float)10.4, (float)20.5) << QPoint((float)120.2, (float)30.2);
polygon << p1 << p2;

outlinePen.setWidth(2);
QGraphicsScene *scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);

QBrush greenBrush(Qt::green);
QBrush blueBrush(Qt::blue);
outlinePen.setWidth(2);

scene->addPolygon(polygon, outlinePen);
}

[d_stranz]

p1(10.4,20.5);

p1(10.4,20.5);

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This is the line that causes the compilation error. The error message is telling you that the QPoint (and QPointF) class has no method with the signature:

void QPoint::operator()( double arg1, double arg2 );

void QPoint::operator()( double arg1, double arg2 );

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which is what your expression translates to. I think you are confusing this with a constructor. You could simply replace this line with this assignment (after changing p1 to QPointF):

p1 = QPointF( x1, y1 );

p1 = QPointF( x1, y1 );

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