linking of combox with lineEdit.

**Devoraz** · 27th July 2009, 10:04

lol. but theres only you who reply me... lol

eh.. how do i place the position and adjust the length and width of the lineedit ontop of the painter widget?

**nish** · 27th July 2009, 10:05

lineedit->move(), linedit->resize()

and the "gurus" are in different timezones so just wait a while...

now dont ask anymore questions... read the tutorial and come back after two days..

**Lykurg** · 27th July 2009, 10:25

Originally Posted by Devoraz

eh.. how do i place the position and adjust the length and width of the lineedit ontop of the painter widget?

Read about the layout system of Qt (QBoxLayout, QGridLayout). Don't position them fix!

**nish** · 27th July 2009, 10:28

Originally Posted by Lykurg

Read about the layout system of Qt (QBoxLayout, QGridLayout). Don't position them fix!

layouts wont work... he needs to put the widget at a perticular place.. and the parent widget is painted by qpainter so he always know the cordinates

**Lykurg** · 27th July 2009, 10:30

Originally Posted by MrDeath

layouts wont work... he needs to put the widget at a perticular place.. and the parent widget is painted by qpainter so he always know the cordinates

Ah, i see, right, this was the yellow bubble thread...

**faldzip** · 27th July 2009, 11:27

Originally Posted by Devoraz

ya damn. if its in C# it will be much much more easier i guess. lol

and i only have 4 weeks left. -_-! i had almost complet my project. this last part is the worst. i manage to slove many of it myself. Qt.... its really nice but really hard -_-!

and how many weeks did you have for the project? maybe you should start doing it earlier :]
And I don't see why Qt is hard? Because it's C++ library? Then it means that C++ is hard for you (for me it is not so hard). Qt has a really good documentation, a lot of examples and everything. I have my assistant open almost everytime I code with Qt just to check the right metods, signals and such things.

And how many years are you studying? I had different programming languages on my studies, and I use C++ but I think that general idea is similar in C# and Java so if you know C# then doing something in C++ shouldn't be a big problem. And Qt is just a bunch of C++ classes (plus some tools).

**Devoraz** · 28th July 2009, 03:43

Originally Posted by Lykurg

Ah, i see, right, this was the yellow bubble thread...

LOL yellow bubble thread -_-!

and how many weeks did you have for the project? maybe you should start doing it earlier :]

i left with 3 more weeks. i only had 12 weeks to do this. like i said, i had already done much changes to my project already. left with this name thing.

And I don't see why Qt is hard? Because it's C++ library? Then it means that C++ is hard for you (for me it is not so hard). Qt has a really good documentation, a lot of examples and everything. I have my assistant open almost everytime I code with Qt just to check the right metods, signals and such things.

hmm. i dun know why, but it just look abit hard to understand, even with the assistant, haha. like i say again, i am totally new to this Qt open source.

And how many years are you studying? I had different programming languages on my studies, and I use C++ but I think that general idea is similar in C# and Java so if you know C# then doing something in C++ shouldn't be a big problem. And Qt is just a bunch of C++ classes (plus some tools).

3 years of engineering, this is my final year. hehe. hmm. perhaps i don understand and dun know how to apply the classes of the Qt source i guess. and for this project. there is alot of .cpp in it. maybe that is why it making me more hard to cope with. as whatever i learnt in my 2 years, i only counter with 1 .cpp, all the programming is done in that 1 .cpp including the declaration.

nvm. i will work harder, its an exposure for me doing this final year project. i love programming. haha.

**Devoraz** · 28th July 2009, 03:51

Qt Code:

Switch view

nameLine = new QLineEdit;
nameLine->setGeometry(QRect(-50,-22,61,21));

nameLine = new QLineEdit;
nameLine->setGeometry(QRect(-50,-22,61,21));

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why doesnt the lineedit appear on top of my painter widget. i am sure the cord is corret as i tested it with

Qt Code:

Switch view

painter->drawRect(-50,-22,61,21);

painter->drawRect(-50,-22,61,21);

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the painter appear but not the lineedit.

**nish** · 28th July 2009, 04:08

you have to pass the parent to lineedit

new QLineEdit(this);

**Devoraz** · 28th July 2009, 04:24

Originally Posted by MrDeath

you have to pass the parent to lineedit

new QLineEdit(this);

eh.. i got this error..

QLineEdit::QLineEdit(QWidget *)' : cannot convert parameter 1 from 'Node *const ' to 'QWidget *'

all the node is drawn using painter. i cant do this.

nameLine = new QLineEdit(painter);

argh.

**nish** · 28th July 2009, 04:28

you have to make the lineEdit the child of the widget you want to show it on..
so pass the parent as the pointer of that widget..
and you havent fully read the tutorial yet.

**Devoraz** · 28th July 2009, 06:05

i really dont know how man. below is the void i wanan add the lineedit into.

the lineedit command is at the end of this void.

Qt Code:

Switch view

void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
{
	QPixmap pixmap2(200,100);
	pixmap2.fill(Qt::white);
	QPixmap pix;
	QPainter painter1(&pixmap);
	QPainter painter2(&pixmap2);
	QString id;
	Q_UNUSED(option);
 
	QSettings settings;
	nodeAlertTemp = settings.value("NodeAlertTemp", 10).toDouble();
 
	if (nodeData.addr!=0){
		if(nodeData.fadeNumber>5&&nodeData.deletedNode!=0)
		{
			nodeData.fadeNumber-=fade_speed;
			if (nodeData.fadeNumber<=5){
 
				nodeData.fadeNumber=0;
				nodeData.deletedNode=1;
				index_number=0;
			}
		}
 
		if(nodeData.fadeNumber<255&&nodeData.newNode!=0)
		{
			nodeData.fadeNumber+=fade_speed;
			if (nodeData.fadeNumber>=255)
			{	
				nodeData.fadeNumber=255;
				nodeData.newNode=0;
				//current_updateData(index_number);
				index_number=0;
			}
		}
	}
    // Draw the grey shadow for a 3d effect.
    painter->setPen(Qt::NoPen);
    painter->setBrush (QColor(0x80, 0x80, 0x80,(nodeData.fadeNumber)));
    painter->drawEllipse(-45, -45, 100, 100);		
 
    // Set gradient and color of the node
    QRadialGradient gradient(0, 0, 50, -20, -20);// access points
 
    if (nodeData.addr==0&&updated == true) 
    {
        // Mouse click on node or an update of node data~
        gradient.setCenter(3, 3);
        gradient.setFocalPoint(3, 3);
        gradient.setColorAt(1, nodeColor.light(120));
		gradient.setColorAt(.5, nodeColorDark.light(120));
        gradient.setColorAt(0, nodeColorDark.light(120));
        updated = false;
		painter->setBrush(gradient);
    } 
	else if (nodeData.addr==0&&updated == false)
	{
		gradient.setColorAt(0, nodeColor.light(150));
        gradient.setColorAt(1, nodeColorDark);
		painter->setBrush(gradient);
    }		
	// end devices
	if (nodeData.addr!=0&&updated == true) 
	{
		// Mouse click on node or an update of node data~
		gradient.setCenter(3, 3);
		gradient.setFocalPoint(3, 3);
		gradient.setColorAt(1, nodeColor);
		gradient.setColorAt(.5, nodeColor);
		gradient.setColorAt(0, nodeColor);
		updated = false;
		painter->setBrush(gradient);
	} 
	else if (nodeData.addr!=0&&updated == false)
	{
		gradient.setColorAt(0, nodeColor);
		gradient.setColorAt(.95, nodeColorDark);
		gradient.setColorAt(1, nodeColor);
		painter->setBrush(gradient);	
	 }
 
 
	 // painter->setBrush(gradient);
	 // Draw black circle around the node
	 painter->setPen(QColor(0, 0, 0,(nodeData.fadeNumber)));
	 // Draw the node
	 painter->drawEllipse(-50, -50, 100, 100);
 
	 //x new text
     // White pen for text
	 if (nodeData.addr==0)
	 {
		 painter->setPen(QPen(Qt::white, 1));
	 }
	 else
	 {
		 if(nodeData.re<100)
		 {
			 painter->setPen(QColor(0, 0, 0,(nodeData.fadeNumber)));
		 }
		 else
		 {
			 painter->setPen(QColor(0xff, 0xff, 0xff,(nodeData.fadeNumber)));
		 }
	 }
	 QString qsTemp;
	 QString qsTemp2;
	 // Write RE
	if (nodeData.re>100)
	{
		rebyte=nodeData.re-100;
	}
	else
	{
		rebyte=nodeData.re;
	}
 
	if (rebyte>4&&nodeData.addr>0)
	{
		qsTemp.sprintf("%d Sec", rebyte);//rebyte
		painter->setFont(timeFont);
		painter->drawText(-50,+8,100,20,Qt::AlignCenter , qsTemp,0);
	}
	else if (nodeData.addr>0)
	{
		qsTemp.sprintf("%d Min", rebyte);
		painter->setFont(timeFont);
		painter->drawText(-50,+8,100,20,Qt::AlignCenter , qsTemp,0);
	}
	else if (nodeData.addr==0)
	{
		//qsTemp = timeStamp.toString("hh:mm:ss");
		qsTemp = timeStamp.toString(Qt::LocalDate);
 
		//qsTemp.sprintf("TxCt: %d", cnt_rf);// for Jeff battery test only
		painter->setFont(timeFont);
		painter->drawText(-50,+5,100,20,Qt::AlignCenter , qsTemp,0);
	}
	// Write the battery voltage
	qsTemp.sprintf("%.1fV", nodeData.voltage);
	painter->setFont(battFont);
	painter->drawText(-50,+25,100,20,Qt::AlignCenter , qsTemp,0);
 
	 // Set text in the node
	 // Write the temperature
	if(celsius)
	{
		qsTemp.sprintf("%.1fÂ°C", ((nodeData.temp-32.0)/1.8));
	}
	else 
	{
        qsTemp.sprintf("%.1fÂ°F", nodeData.temp);	
	}
	 if (nodeData.addr==0)					//node 0 
	{
	//xpainter->setFont(tempFont);
		painter->setFont(addrFont);
		painter->drawText(-50,-45,100,40,Qt::AlignCenter , qsTemp,0);
	}
	 else 
	 {
		 painter->setFont(timeFont);
		 painter->drawText(-50,-48,100,40,Qt::AlignCenter , qsTemp,0);
	 }
	if (nodeData.addr==0)					//node 0 
	{
		// Write node number
		//qsTemp.sprintf("Node: %d", nodeData.addr);
		qsTemp.sprintf("Access Point");
		//xpainter->setFont(addrFont);
		painter->setFont(timeFont);
		painter->drawText(-50,-15,100,20,Qt::AlignCenter , qsTemp,0);
	}
	 else
	 {
		// Write node number
		// end device details
 
		qsTemp.sprintf("End Device %d", nodeData.addr);
		//xpainter->setFont(addrFont);
		painter->setFont(timeFont);
		painter->drawText(-50,-22,100,20,Qt::AlignCenter , qsTemp,0);
 
		//Write signal strength in ED node
		if (nodeData.strength > 21)
		{
		qsTemp.sprintf("Strong", nodeData.strength);
		painter->setFont(strengthFont);
		painter->drawText(-50,-8,100,20,Qt::AlignCenter , qsTemp,0);
		}
		else if (nodeData.strength > 15)
		{
		qsTemp.sprintf("Medium", nodeData.strength);
		painter->setFont(strengthFont);
		painter->drawText(-50,-8,100,20,Qt::AlignCenter , qsTemp,0);
		}
		else 
		{
		qsTemp.sprintf("Weak", nodeData.strength);
		painter->setFont(strengthFont);
		painter->drawText(-50,-8,100,20,Qt::AlignCenter , qsTemp,0);
		}
		//temperture alert, 
		if(nodeData.temp > (nodeAlertTemp*9)/5+32.0)
		{	
		painter->setPen(Qt::NoPen);
		painter->setBrush (QColor(0x80, 0x80, 0x80,(nodeData.fadeNumber)));	
		painter->drawEllipse(-45, -45, 100, 100);	
		gradient.setCenter(3, 3);
		gradient.setFocalPoint(3, 3);
		QRadialGradient gradient(0, 0, 50, -20, -20);
		gradient.setColorAt(1, nodeAlertColor);		
		gradient.setColorAt(.5, nodeAlertColorDark);	
		gradient.setColorAt(0, nodeAlertColorDark);
		painter->setBrush(gradient);
		painter->setPen(QColor(0, 0, 0,(nodeData.fadeNumber)));
		painter->drawEllipse(-50, -50, 100, 100);
			if(celsius) 
			{
			qsTemp.sprintf("ALERT!\n\ End Device %d\n\ %.1fÂ°C\n\ ", nodeData.addr, ((nodeData.temp-32.0)/1.8));		
			painter->setPen(QPen(Qt::black, 0));			
			painter->setFont(timeFont);
			painter->drawText(-50,-50,100,100,Qt::AlignCenter , qsTemp,0);
			}
			else 
			{
			qsTemp.sprintf("ALERT!\n\ End Device %d\n\ %.1fÂ°F\n\ ", nodeData.addr, nodeData.temp);
			painter->setPen(QPen(Qt::black, 0));			
			painter->setFont(timeFont);
			painter->drawText(-50,-50,100,100,Qt::AlignCenter , qsTemp,0);
			}
		}
		painter->drawRect(-43,-20,85,15);
		[COLOR="blue"]nameLine = new QLineEdit();
		nameLine->setGeometry(QRect(-43,-20,85,15));[/COLOR]	}

void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
{
	QPixmap pixmap2(200,100);
	pixmap2.fill(Qt::white);
	QPixmap pix;
	QPainter painter1(&pixmap);
	QPainter painter2(&pixmap2);
	QString id;
	Q_UNUSED(option);

	QSettings settings;
	nodeAlertTemp = settings.value("NodeAlertTemp", 10).toDouble();

	if (nodeData.addr!=0){
		if(nodeData.fadeNumber>5&&nodeData.deletedNode!=0)
		{
			nodeData.fadeNumber-=fade_speed;
			if (nodeData.fadeNumber<=5){
			
				nodeData.fadeNumber=0;
				nodeData.deletedNode=1;
				index_number=0;
			}
		}

		if(nodeData.fadeNumber<255&&nodeData.newNode!=0)
		{
			nodeData.fadeNumber+=fade_speed;
			if (nodeData.fadeNumber>=255)
			{	
				nodeData.fadeNumber=255;
				nodeData.newNode=0;
				//current_updateData(index_number);
				index_number=0;
			}
		}
	}
    // Draw the grey shadow for a 3d effect.
    painter->setPen(Qt::NoPen);
    painter->setBrush (QColor(0x80, 0x80, 0x80,(nodeData.fadeNumber)));
    painter->drawEllipse(-45, -45, 100, 100);		

    // Set gradient and color of the node
    QRadialGradient gradient(0, 0, 50, -20, -20);// access points

    if (nodeData.addr==0&&updated == true) 
    {
        // Mouse click on node or an update of node data~
        gradient.setCenter(3, 3);
        gradient.setFocalPoint(3, 3);
        gradient.setColorAt(1, nodeColor.light(120));
		gradient.setColorAt(.5, nodeColorDark.light(120));
        gradient.setColorAt(0, nodeColorDark.light(120));
        updated = false;
		painter->setBrush(gradient);
    } 
	else if (nodeData.addr==0&&updated == false)
	{
		gradient.setColorAt(0, nodeColor.light(150));
        gradient.setColorAt(1, nodeColorDark);
		painter->setBrush(gradient);
    }		
	// end devices
	if (nodeData.addr!=0&&updated == true) 
	{
		// Mouse click on node or an update of node data~
		gradient.setCenter(3, 3);
		gradient.setFocalPoint(3, 3);
		gradient.setColorAt(1, nodeColor);
		gradient.setColorAt(.5, nodeColor);
		gradient.setColorAt(0, nodeColor);
		updated = false;
		painter->setBrush(gradient);
	} 
	else if (nodeData.addr!=0&&updated == false)
	{
		gradient.setColorAt(0, nodeColor);
		gradient.setColorAt(.95, nodeColorDark);
		gradient.setColorAt(1, nodeColor);
		painter->setBrush(gradient);	
	 }

	 
	 // painter->setBrush(gradient);
	 // Draw black circle around the node
	 painter->setPen(QColor(0, 0, 0,(nodeData.fadeNumber)));
	 // Draw the node
	 painter->drawEllipse(-50, -50, 100, 100);
	 
	 //x new text
     // White pen for text
	 if (nodeData.addr==0)
	 {
		 painter->setPen(QPen(Qt::white, 1));
	 }
	 else
	 {
		 if(nodeData.re<100)
		 {
			 painter->setPen(QColor(0, 0, 0,(nodeData.fadeNumber)));
		 }
		 else
		 {
			 painter->setPen(QColor(0xff, 0xff, 0xff,(nodeData.fadeNumber)));
		 }
	 }
	 QString qsTemp;
	 QString qsTemp2;
	 // Write RE
	if (nodeData.re>100)
	{
		rebyte=nodeData.re-100;
	}
	else
	{
		rebyte=nodeData.re;
	}

	if (rebyte>4&&nodeData.addr>0)
	{
		qsTemp.sprintf("%d Sec", rebyte);//rebyte
		painter->setFont(timeFont);
		painter->drawText(-50,+8,100,20,Qt::AlignCenter , qsTemp,0);
	}
	else if (nodeData.addr>0)
	{
		qsTemp.sprintf("%d Min", rebyte);
		painter->setFont(timeFont);
		painter->drawText(-50,+8,100,20,Qt::AlignCenter , qsTemp,0);
	}
	else if (nodeData.addr==0)
	{
		//qsTemp = timeStamp.toString("hh:mm:ss");
		qsTemp = timeStamp.toString(Qt::LocalDate);
		
		//qsTemp.sprintf("TxCt: %d", cnt_rf);// for Jeff battery test only
		painter->setFont(timeFont);
		painter->drawText(-50,+5,100,20,Qt::AlignCenter , qsTemp,0);
	}
	// Write the battery voltage
	qsTemp.sprintf("%.1fV", nodeData.voltage);
	painter->setFont(battFont);
	painter->drawText(-50,+25,100,20,Qt::AlignCenter , qsTemp,0);
	 
	 // Set text in the node
	 // Write the temperature
	if(celsius)
	{
		qsTemp.sprintf("%.1fÂ°C", ((nodeData.temp-32.0)/1.8));
	}
	else 
	{
        qsTemp.sprintf("%.1fÂ°F", nodeData.temp);	
	}
	 if (nodeData.addr==0)					//node 0 
	{
	//xpainter->setFont(tempFont);
		painter->setFont(addrFont);
		painter->drawText(-50,-45,100,40,Qt::AlignCenter , qsTemp,0);
	}
	 else 
	 {
		 painter->setFont(timeFont);
		 painter->drawText(-50,-48,100,40,Qt::AlignCenter , qsTemp,0);
	 }
	if (nodeData.addr==0)					//node 0 
	{
		// Write node number
		//qsTemp.sprintf("Node: %d", nodeData.addr);
		qsTemp.sprintf("Access Point");
		//xpainter->setFont(addrFont);
		painter->setFont(timeFont);
		painter->drawText(-50,-15,100,20,Qt::AlignCenter , qsTemp,0);
	}
	 else
	 {
		// Write node number
		// end device details

		qsTemp.sprintf("End Device %d", nodeData.addr);
		//xpainter->setFont(addrFont);
		painter->setFont(timeFont);
		painter->drawText(-50,-22,100,20,Qt::AlignCenter , qsTemp,0);
		
		//Write signal strength in ED node
		if (nodeData.strength > 21)
		{
		qsTemp.sprintf("Strong", nodeData.strength);
		painter->setFont(strengthFont);
		painter->drawText(-50,-8,100,20,Qt::AlignCenter , qsTemp,0);
		}
		else if (nodeData.strength > 15)
		{
		qsTemp.sprintf("Medium", nodeData.strength);
		painter->setFont(strengthFont);
		painter->drawText(-50,-8,100,20,Qt::AlignCenter , qsTemp,0);
		}
		else 
		{
		qsTemp.sprintf("Weak", nodeData.strength);
		painter->setFont(strengthFont);
		painter->drawText(-50,-8,100,20,Qt::AlignCenter , qsTemp,0);
		}
		//temperture alert, 
		if(nodeData.temp > (nodeAlertTemp*9)/5+32.0)
		{	
		painter->setPen(Qt::NoPen);
		painter->setBrush (QColor(0x80, 0x80, 0x80,(nodeData.fadeNumber)));	
		painter->drawEllipse(-45, -45, 100, 100);	
		gradient.setCenter(3, 3);
		gradient.setFocalPoint(3, 3);
		QRadialGradient gradient(0, 0, 50, -20, -20);
		gradient.setColorAt(1, nodeAlertColor);		
		gradient.setColorAt(.5, nodeAlertColorDark);	
		gradient.setColorAt(0, nodeAlertColorDark);
		painter->setBrush(gradient);
		painter->setPen(QColor(0, 0, 0,(nodeData.fadeNumber)));
		painter->drawEllipse(-50, -50, 100, 100);
			if(celsius) 
			{
			qsTemp.sprintf("ALERT!\n\ End Device %d\n\ %.1fÂ°C\n\ ", nodeData.addr, ((nodeData.temp-32.0)/1.8));		
			painter->setPen(QPen(Qt::black, 0));			
			painter->setFont(timeFont);
			painter->drawText(-50,-50,100,100,Qt::AlignCenter , qsTemp,0);
			}
			else 
			{
			qsTemp.sprintf("ALERT!\n\ End Device %d\n\ %.1fÂ°F\n\ ", nodeData.addr, nodeData.temp);
			painter->setPen(QPen(Qt::black, 0));			
			painter->setFont(timeFont);
			painter->drawText(-50,-50,100,100,Qt::AlignCenter , qsTemp,0);
			}
		}
		painter->drawRect(-43,-20,85,15);
		[COLOR="blue"]nameLine = new QLineEdit();
		nameLine->setGeometry(QRect(-43,-20,85,15));[/COLOR]	}

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**nish** · 28th July 2009, 06:17

so your are creating a lineEdit inside the paint method which would be called thousands of time per second... so every time you will be creating the lineEdit and creating a memory leak. The line edit should be created once in the main widget on which the painter is painting and use the pointer to the line edit in paint()

**Devoraz** · 28th July 2009, 06:23

OMG!! argh..

i guess the main widget on which the painter pain on is here. so i write the command of the line edit here?

Qt Code:

Switch view

QRectF Node::boundingRect() const
{
    qreal adjust = 2;
    return QRectF(-50 - adjust, -50 - adjust,
                  110 + adjust, 110 + adjust);
}

QRectF Node::boundingRect() const
{
    qreal adjust = 2;
    return QRectF(-50 - adjust, -50 - adjust,
                  110 + adjust, 110 + adjust);
}

To copy to clipboard, switch view to plain text mode

**Devoraz** · 29th July 2009, 01:56

hello~ Mr.Death~~~

**nish** · 29th July 2009, 03:15

hello there...

make the line edit in constructor of you widget being painted.

**Devoraz** · 29th July 2009, 05:59

Originally Posted by MrDeath

hello there...

make the line edit in constructor of you widget being painted.

sorry, but i dun get what you mean by in construtor of my widget

**nish** · 29th July 2009, 06:04

you have a widget subclass on which you use the QPainter rite?
make lineedit a member of your qwidget subclass and new it in the constructor of that subclass.

take a look at the example programs that comes with Qt please please....

**Devoraz** · 29th July 2009, 06:19

Originally Posted by MrDeath

take a look at the example programs that comes with Qt please please....

argh argh argh. why i dun seem to understand. lol. which example? do i look into?

**nish** · 29th July 2009, 06:29

widget painting example..

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