C++ RefPtr::rel_line_to方法代码示例

bool CalibrationArea::on_expose_event(GdkEventExpose *event)
{
    // check that screensize did not change
    if (display_width != get_width() ||
         display_height != get_height()) {
        set_display_size(get_width(), get_height());
    }

    Glib::RefPtr<Gdk::Window> window = get_window();
    if (window) {
        Cairo::RefPtr<Cairo::Context> cr = window->create_cairo_context();
        cr->save();

        cr->rectangle(event->area.x, event->area.y, event->area.width, event->area.height);
        cr->clip();

        // Print the text
        cr->set_font_size(font_size);
        double text_height = -1;
        double text_width = -1;
        Cairo::TextExtents extent;
        for (int i = 0; i != help_lines; i++) {
            cr->get_text_extents(help_text[i], extent);
            text_width = std::max(text_width, extent.width);
            text_height = std::max(text_height, extent.height);
        }
        text_height += 2;

        double x = (display_width - text_width) / 2;
        double y = (display_height - text_height) / 2 - 60;
        cr->set_line_width(2);
        cr->rectangle(x - 10, y - (help_lines*text_height) - 10,
                text_width + 20, (help_lines*text_height) + 20);

        // Print help lines
        y -= 3;
        for (int i = help_lines-1; i != -1; i--) {
            cr->get_text_extents(help_text[i], extent);
            cr->move_to(x + (text_width-extent.width)/2, y);
            cr->show_text(help_text[i]);
            y -= text_height;
        }
        cr->stroke();

        // Draw the points
        for (int i = 0; i <= calibrator->get_numclicks(); i++) {
            // set color: already clicked or not
            if (i < calibrator->get_numclicks())
                cr->set_source_rgb(1.0, 1.0, 1.0);
            else
                cr->set_source_rgb(0.8, 0.0, 0.0);

            cr->set_line_width(1);
            cr->move_to(X[i] - cross_lines, Y[i]);
            cr->rel_line_to(cross_lines*2, 0);
            cr->move_to(X[i], Y[i] - cross_lines);
            cr->rel_line_to(0, cross_lines*2);
            cr->stroke();

            cr->arc(X[i], Y[i], cross_circle, 0.0, 2.0 * M_PI);
            cr->stroke();
        }

        // Draw the clock background
        cr->arc(display_width/2, display_height/2, clock_radius/2, 0.0, 2.0 * M_PI);
        cr->set_source_rgb(0.5, 0.5, 0.5);
        cr->fill_preserve();
        cr->stroke();

        cr->set_line_width(clock_line_width);
        cr->arc(display_width/2, display_height/2, (clock_radius - clock_line_width)/2,
             3/2.0*M_PI, (3/2.0*M_PI) + ((double)time_elapsed/(double)max_time) * 2*M_PI);
        cr->set_source_rgb(0.0, 0.0, 0.0);
        cr->stroke();


        // Draw the message (if any)
        if (message != NULL) {
            // Frame the message
            cr->set_font_size(font_size);
            Cairo::TextExtents extent;
            cr->get_text_extents(this->message, extent);
            text_width = extent.width;
            text_height = extent.height;

            x = (display_width - text_width) / 2;
            y = (display_height - text_height + clock_radius) / 2 + 60;
            cr->set_line_width(2);
            cr->rectangle(x - 10, y - text_height - 10,
                    text_width + 20, text_height + 25);

            // Print the message
            cr->move_to(x, y);
            cr->show_text(this->message);
            cr->stroke();
        }

        cr->restore();
    }

//.........这里部分代码省略.........

    void NodeSurface::DrawPorts( 
        Cairo::RefPtr<Cairo::Context> refCairo, 
        TopologyNode* pNode )
    {
        refCairo->save();

        const float k_divisor = 255.0;
        float red = 38 / k_divisor;
        float green = 199 / k_divisor;
        float blue = 38 / k_divisor;
        refCairo->set_source_rgb( red, green, blue );

        refCairo->set_source_rgb( 0, 0, 0 );

        refCairo->set_line_width( 5 );

        int numChildren = 0;
        for ( unsigned int i=0; i < pNode->GetNumPorts(); i++ )
        {
            if ( pNode->GetPortType(i) == TopologyNode::CONNECTED_TO_CHILD )
            {
                numChildren++;
            }
        }

        int childIndex = 0;
        for ( unsigned int i=0; i < pNode->GetNumPorts(); i++ )
        {
            TopologyNode::PortType currPort = pNode->GetPortType(i);

            switch (currPort)
            {
            case TopologyNode::NOT_CONNECTED:
                break;

            case TopologyNode::CONNECTED_TO_PARENT:                
                {
                    refCairo->move_to( sk_nodeWidth/2 - sk_portWidth/2, 0 );
                    refCairo->rel_line_to( sk_portWidth, 0 );
                    refCairo->rel_line_to( 0, sk_portHeight );
                    refCairo->rel_line_to( -sk_portWidth, 0 );
                    refCairo->fill();
                }
                break;

            case TopologyNode::CONNECTED_TO_CHILD:
                {
                    int startX = (sk_nodeWidth / (numChildren+1)) * (childIndex+1);

                    refCairo->move_to( startX - sk_portWidth/2, sk_nodeHeight );
                    refCairo->rel_line_to( sk_portWidth, 0 );
                    refCairo->rel_line_to( 0, -sk_portHeight );
                    refCairo->rel_line_to( -sk_portWidth, 0 );
                    refCairo->fill();                    
 
                    childIndex++;
                }
                break;

            default:
                break;

            }
        }

        refCairo->restore();
    }

bool graphView::on_draw(const Cairo::RefPtr<Cairo::Context>& cr){
	
	//Get the allocation of our widget, and get the height and width from it
	Gtk::Allocation wAllocation = this->get_allocation();
	const int wHeight = wAllocation.get_height();
	const int wWidth = wAllocation.get_width();
	
	const double lineWidth = wHeight;
	
	//scale the Cario context obj to the current wHeight and wWidth
	//cr->scale(wWidth, wHeight);
	//now change the offset point coordinates, so point (0,0) will be at (0.5,0.5)
	cr->translate(wWidth/2, wHeight/2);
	//set the line width to 2 px, this should be a settings for each graph in the futur
	cr->set_line_width(1);
	
	//paint the background white
	cr->set_source_rgb(1,1,1);
	cr->paint();
	
	//draw the coordinatesystem
	cr->set_source_rgb(0,0,0);
	cr->move_to(0,0);
	cr->line_to(wWidth,0);
	cr->move_to(0,0);
	cr->line_to(0,wHeight);
	cr->move_to(0,0);
	cr->line_to(-1*wWidth,0);
	cr->move_to(0,0);
	cr->line_to(0,-1*wHeight);
	
	//draw the axes unit, again this should't be hardcoded in the futur
	cr->move_to(0,0);
	
	for(int i = 1; i <= 25; i++)
	{
		cr->move_to((wWidth*0.5/25)*i,0);
		cr->rel_move_to(0, -8);
		cr->rel_line_to(0,16);
		cr->rel_move_to(0, -8);
		
		cr->move_to((wWidth*0.5/25)*-i,0);
		cr->rel_move_to(0, -8);
		cr->rel_line_to(0,16);
		cr->rel_move_to(0, -8);
		
	}
	
	cr->move_to(0, 0);
	
	for(int i = 1; i <= 25; i++)
	{
		cr->move_to(0,(wHeight*0.5/25)*i);
		cr->rel_move_to(-8,0);
		cr->rel_line_to(16,0);
		cr->rel_move_to(-8,0);
		
		cr->move_to(0,(wHeight*0.5/25)*-i);
		cr->rel_move_to(-8,0);
		cr->rel_line_to(16,0);
		cr->rel_move_to(-8,0);
		
	}
	
	cr->stroke();
	
	cr->set_source_rgb(0.8,0,0);
	if(this->tree)
	{
		cr->set_line_width(3);
		std::vector<equation*> eqs = this->tree->getEquations();
		
		double pxWidth = wWidth/50;
		double pxHeight = wHeight/50;
		
		for(int i = 0; i < eqs.size(); i++){
			
			equation *eq = eqs[i];
			
			for(double x = -25; x<= 25; x+= 0.01)
			{
				double y = eq->getYFromX(x);
				
				cr->move_to(x*pxWidth,-1*(y*pxHeight));
				cr->rel_line_to(1,1);
			}
			cr->stroke();
		}
	}
	
	return true;
}