svgwidget.cpp

linux窗口程序设计一书的第五章代码-- 图形与图画,希望对大家有用

#include "svgwidget.h"

SvgWidget::SvgWidget(QWidget *parent)
{
    render = renderer();  
}

void SvgWidget::wheelEvent(QWheelEvent * e)
{
     const double diff = 0.1;
     QSize size = render->defaultSize();
     int width  = size.width();
     int height = size.height();
     if (e->delta() > 0) {
         width = int(this->width()+this->width()*diff);
         height = int(this->height()+this->height()*diff);
     } else {
         width  = int(this->width()-this->width()*diff);
         height = int(this->height()-this->height()*diff);
     }
     resize(width, height);
}