setRasterOp Equivalent

[vermarajeev]

Hi wysota!,
Can you please help me with this???

Waiting for a reply!!!!!!

[vermarajeev]

The below solution draws only a single line. How to draw two or more lines???

void setRasterOpTest::mousePressEvent( QMouseEvent *e ){  
	if (e->button() == Qt::LeftButton) {
		m_firstpt = e->pos();      
		m_lastpt = e->pos();      
     }
}
 
void setRasterOpTest::mouseMoveEvent( QMouseEvent *e ){  
	if ((e->buttons() & Qt::LeftButton) ){
		m_lastpt = e->pos();  
		update();
	}
}
 
void setRasterOpTest::mouseReleaseEvent(QMouseEvent *e){
	if (e->button() == Qt::LeftButton ) {
        m_lastpt = e->pos();	
		update();
     }
}
 
void setRasterOpTest::paintEvent(QPaintEvent *e){  
	 QPainter painter(this);
	 painter.setPen( Qt::black );
     painter.drawLine(m_firstpt, m_lastpt);     
}

void setRasterOpTest::mousePressEvent( QMouseEvent *e ){  
	if (e->button() == Qt::LeftButton) {
		m_firstpt = e->pos();      
		m_lastpt = e->pos();      
     }
}

void setRasterOpTest::mouseMoveEvent( QMouseEvent *e ){  
	if ((e->buttons() & Qt::LeftButton) ){
		m_lastpt = e->pos();  
		update();
	}
}

void setRasterOpTest::mouseReleaseEvent(QMouseEvent *e){
	if (e->button() == Qt::LeftButton ) {
        m_lastpt = e->pos();	
		update();
     }
}

void setRasterOpTest::paintEvent(QPaintEvent *e){  
	 QPainter painter(this);
	 painter.setPen( Qt::black );
     painter.drawLine(m_firstpt, m_lastpt);     
}

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[vermarajeev]

One more solution, Now this draws so many lines.. I'm trying and let you know if I get it...
Here is the program...

void setRasterOpTest::mousePressEvent( QMouseEvent *e ){  
	if (e->button() == Qt::LeftButton) {
		m_firstpt = e->pos();
		m_lastpt = e->pos();		
     }
}
 
void setRasterOpTest::mouseMoveEvent( QMouseEvent *e ){  
	if ((e->buttons() & Qt::LeftButton) ){
		m_lastpt = e->pos();		
		update();
	}
}
 
void setRasterOpTest::mouseReleaseEvent(QMouseEvent *e){
	if (e->button() == Qt::LeftButton ) {
		m_lastpt = e->pos();     		
		update();
     }
}
 
void setRasterOpTest::paintEvent(QPaintEvent *e){  
	 QPainter painter(this);
	 painter.setPen( Qt::black );	 	 	 
	 m_vectorLine << QLine( m_firstpt, m_lastpt );
	 painter.drawLines( m_vectorLine );	 
}

void setRasterOpTest::mousePressEvent( QMouseEvent *e ){  
	if (e->button() == Qt::LeftButton) {
		m_firstpt = e->pos();
		m_lastpt = e->pos();		
     }
}

void setRasterOpTest::mouseMoveEvent( QMouseEvent *e ){  
	if ((e->buttons() & Qt::LeftButton) ){
		m_lastpt = e->pos();		
		update();
	}
}

void setRasterOpTest::mouseReleaseEvent(QMouseEvent *e){
	if (e->button() == Qt::LeftButton ) {
		m_lastpt = e->pos();     		
		update();
     }
}

void setRasterOpTest::paintEvent(QPaintEvent *e){  
	 QPainter painter(this);
	 painter.setPen( Qt::black );	 	 	 
	 m_vectorLine << QLine( m_firstpt, m_lastpt );
	 painter.drawLines( m_vectorLine );	 
}

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If you get it before please let me know...
Thanks

[wysota]

Sorry, I've been unavailable.

Maybe you should change your concept a little and make it so that you click and drag with left mouse button and when you want to finish a line segment, you click with right mouse button.

It would look more or less like so:

void setRasterOpTest::mousePressEvent *e){
  if(e->button()==Qt::LeftButton){
    m_list.clear();
    m_list << e->pos();
    m_lastpt = e->pos();
  } else if(e->button()==Qt::RightButton){
    m_list << e->pos();
    m_lastpt = e->pos();
  }
}
void setRasterOpTest::mouseMoveEvent( QMouseEvent *e )
{
  m_lastpt = e->pos();
  update();
}
void setRasterOpTest::mouseReleaseEvent(QMouseEvent *e){
  if(e->button()==Qt::LeftButton()){
    if(m_list.size()==1 && (e->pos()-m_list[0]).manhattanLength()<5){
      m_list.clear();
      update();
      return;
    }
    m_list << e->pos();
    m_lastpt = QPoint();
    update();
  }
}
void setRasterOpTest::paintEvent(QPaintEvent *e){
  //... (do regular stuff here)
  if(!m_list.isEmpty()){
    painter.save();
    painter.setPen(Qt::black);
    painter.drawLines(m_list);
    painter.setPen(Qt::red);
    painter.drawLine(m_list[m_list.size()-1], m_lastpt);
    painter.restore();
  }
}

void setRasterOpTest::mousePressEvent *e){
  if(e->button()==Qt::LeftButton){
    m_list.clear();
    m_list << e->pos();
    m_lastpt = e->pos();
  } else if(e->button()==Qt::RightButton){
    m_list << e->pos();
    m_lastpt = e->pos();
  }
}
void setRasterOpTest::mouseMoveEvent( QMouseEvent *e )
{
  m_lastpt = e->pos();
  update();
}
void setRasterOpTest::mouseReleaseEvent(QMouseEvent *e){
  if(e->button()==Qt::LeftButton()){
    if(m_list.size()==1 && (e->pos()-m_list[0]).manhattanLength()<5){
      m_list.clear();
      update();
      return;
    }
    m_list << e->pos();
    m_lastpt = QPoint();
    update();
  }
}
void setRasterOpTest::paintEvent(QPaintEvent *e){
  //... (do regular stuff here)
  if(!m_list.isEmpty()){
    painter.save();
    painter.setPen(Qt::black);
    painter.drawLines(m_list);
    painter.setPen(Qt::red);
    painter.drawLine(m_list[m_list.size()-1], m_lastpt);
    painter.restore();
  }
}

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EDIT: A complete working example is attached.

[vermarajeev]

Hi wysota,
My application is something like QPainter in MS where you can draw different kind of molecules (in chemistry term). The product is now to be ported to qt4. If I change the functionality (which is not a good idea) of drawing operations, I'll have tough time with my client.

The above sample program is the first step (where I should be able to draw two or more straight lines) to move forward.

I think you can understand my problem so please help me to achieve the same functionality as setRasterOp in qt3 performs.

Waiting eagerly for a reply....