QT 驗證改進後Bresenham演算法

void LoginDialog::paintEvent(QPaintEvent *)

{

    int x0,  y0, xEnd, yEnd;

        QPainter painter(this);

       //引數為：畫刷，線寬，畫筆風格，畫筆端點，畫筆連線風格

        QPen pen(Qt::green, 5, Qt::DotLine, Qt::RoundCap, Qt::RoundJoin);

        painter.setPen(pen);

        x0= ui->x->text().toInt();

        y0=ui->y->text().toInt();

        xEnd=ui->x1->text().toInt();

        yEnd=ui->y2->text().toInt();

        int x,y,dx,dy,e;

        float k;

        dx=xEnd-x0;

        dy=yEnd-y0;

        k=(float)dy/dx;

        e=-dx;x=x0;y=y0;

        if(k>=0||k<=1){

        while(x<=xEnd){

                painter.drawPoint(x+100,y+100);

                x++;

                e=e+2*dy;

                if(e>0){

                    y++;

                    e=e-2*dx;

                }

            }

}

        else if(k>=1){

            while(y<=yEnd){

                    painter.drawPoint(x+100,y+100);

                    y++;

                    e=e+2*dx;

                    if(e>0){

                        x++;

                        e=e-2*dy;

                    }

                }

        }

}

執行結果示例